+publisher:"Universidade do Rio Grande do Norte" +contributor:("CPF:05641284491")

Universidade do Rio Grande do Norte

1. Lima, Lêda Maria Oliveira de. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .

Degree: 2010, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/17709

► Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a… (more)

▼ Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a surfactant derived from coconut oil (SCO saponified coconut oil) in the recovery process of organic compounds that are present in oily effluents from petroleum industry. For this end, experiments were accomplished in a column of small dimension objectifying to verify the influence of the surfactant SCO in the efficiency of oil removal. This way, they were prepared emulsions with amount it fastens of oil (50, 100, 200 and 400 ppm), being determined the great concentrations of surfactant for each one of them. Some rehearsals were still accomplished with produced water of the industry of the petroleum to compare the result with the one of the emulsions. According to the experiments, it was verified that an increase of the surfactant concentration does not implicate in a greater oil removal. The separation process use gaseous bubbles formed when a gas stream pass a liquid column, when low surfactant concentrations are used, it occurs the coalescence of the dispersed oil droplets and their transport to the top of the column, forming a new continuous phase. Such surfactants lead to a gas-liquid interface saturation, depending on the used surfactant concentration, affecting the flotation process and influencing in the removal capacity of the oily dispersed phase. A porous plate filter, with pore size varying from 40 to 250 mm, was placed at the base of the column to allow a hydrodynamic stable operation. During the experimental procedures, the operating volume of phase liquid was held constant and the rate of air flow varied in each experiment. The resulting experimental of the study hydrodynamic demonstrated what the capturing of the oil was influenced by diameter of the bubbles and air flow. With the increase flow of 300 about to 900 cm3.min-1, occurred an increase in the removal of oil phase of 44% about to 66% and the removal kinetic of oil was defined as a reaction of 1° order. Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Flotação; Efluentes oleosos; Petróleo; Óleo de coco; Tensoativo; Flotation; Oily effluents; Petroleum; Coconut oil; Surfactant

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APA (6^th Edition):

Lima, L. M. O. d. (2010). Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/17709

Chicago Manual of Style (16^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2010. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/17709.

MLA Handbook (7^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2010. Web. 20 Nov 2019.

Vancouver:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2010. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/17709.

Council of Science Editors:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/17709

Universidade do Rio Grande do Norte

2. Silva, Paula Katherine Leonez da. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15743

► In the petroleum industry, water is always present in the reservoir formation together with petroleum and natural gas and this fact provokes the production of… (more)

▼ In the petroleum industry, water is always present in the reservoir formation together with petroleum and natural gas and this fact provokes the production of water with petroleum, resulting in a great environmental impact. Several methods can be applied for treatment of oily waters, such as: gravitational vases, granulated media filtration systems, flotation process, centrifugation process and the use of hydrocyclones, which can also be used in a combined way. However, the flotation process has showed a great efficiency as compared with other methods, because these methods do not remove great part of the emulsified oil. In this work was investigated the use of surfactants derived from vegetable oils, OSS and OGS, as collectors, using the flotation process in a glass column with a porous plate filter in its base for the input of the gaseous steam. For this purpose, oil/water emulsions were prepared using mechanical stirring, with concentrations around 300 ppm. The air flow rate was set at 700 cm3/min and the porous plate filter used for the generation of the air bubbles has pore size varying from 16 to 40 Pm. The column operated at constant volume (1500mL). A new methodology has been developed to collect the samples, where, instead of collecting the water phase, it was collected the oil phase removed by the process in the top of the flotation column. It has been observed that it is necessary to find an optimum surfactant concentration to achieve enhanced removal efficiency. Being for OSS 1.275 mmol/L and for OGS 0.840 mmol/L, with removal efficiencies of 93% and 99%, respectively, using synthetic solutions. For the produced water, the removal in these concentrations was 75% for OSS and 65% for OGS. It is possible to remove oil from water in a flotation process using surfactants of high HLB, fact that is against the own definition of HLB (Hydrophile-Lipophile Balance). The interfacial tension is an important factor in the oil removal process using a flotation process, because it has direct interference in the coalescence of the oil drops. The spreading of the oil of the air bubble should be considered in the process, and for the optimum surfactant concentrations it reached a maximum value. The removal kinetics for the flotation process using surfactants in the optimum concentration has been adjusted according to a first order model, for synthetic water as for the produced water. Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Melo, Josette Lourdes de Sousa (advisor), CPF:10200720406 (advisor), do%3Fid%3DK4787094H6%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787094H6 (advisor).

Subjects/Keywords: Efluentes oleosos; Flotação; Tensoativo; Tensão interfacial; Coeficiente de espalhamento; Oily effluents; Flotation; Surfactant; Interfacial tension; Spreading coefficients

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APA (6^th Edition):

Silva, P. K. L. d. (2008). Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15743

Chicago Manual of Style (16^th Edition):

Silva, Paula Katherine Leonez da. “Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .” 2008. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15743.

MLA Handbook (7^th Edition):

Silva, Paula Katherine Leonez da. “Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .” 2008. Web. 20 Nov 2019.

Vancouver:

Silva PKLd. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15743.

Council of Science Editors:

Silva PKLd. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . [Masters Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15743

Universidade do Rio Grande do Norte

3. Melo, Klismeryane Costa de. Avaliação e modelagem reológica de fluido de perfuração base água .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15751

► The determination of the rheology of drilling fluids is of fundamental importance to select the best composition and the best treatment to be applied in… (more)

▼ The determination of the rheology of drilling fluids is of fundamental importance to select the best composition and the best treatment to be applied in these fluids. This work presents a study of the rheological behavior of some addictives used as viscosifiers in water-based drilling fluids. The evaluated addictives were: Carboxymethylcellulose (CMC), Xanthan gum (GX), and Bentonite. The main objective was to rheologically characterize suspensions composed by these addictives, by applying mathematical models for fluid flow behavior, in order to determine the best flow equation to represent the system, as well as the model parameters. The mathematical models applied in this research were: the Bingham Model, the Ostwald de Wale Model, and the Herschel-Bulkley Model. A previous study of hydration time for each used addictive was accomplished seeking to evaluate the effect of polymer and clay hydration on rheological behavior of the fluid. The rheological characterization was made through typical rheology experiments, using a coaxial cylinder viscosimeter, where the flow curves and the thixotropic magnitude of each fluid was obtained. For each used addictive the rheological behavior as a function of temperature was also evaluated as well as fluid stability as a function of the concentration and kind of addictive used. After analyses of results, mixtures of polymer and clay were made seeking to evaluate the rheological modifications provided by the polymer incorporation in the water + bentonite system. The obtained results showed that the Ostwald de Waale model provided the best fit for fluids prepared using CMC and for fluids with Xanthan gum and Bentonite the best fit was given by the Herschel-Bulkley one Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Fluído de perfuração; Reologia; Polímeros; Drilling fluids; Rheology; Polymers

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APA (6^th Edition):

Melo, K. C. d. (2008). Avaliação e modelagem reológica de fluido de perfuração base água . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15751

Chicago Manual of Style (16^th Edition):

Melo, Klismeryane Costa de. “Avaliação e modelagem reológica de fluido de perfuração base água .” 2008. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15751.

MLA Handbook (7^th Edition):

Melo, Klismeryane Costa de. “Avaliação e modelagem reológica de fluido de perfuração base água .” 2008. Web. 20 Nov 2019.

Vancouver:

Melo KCd. Avaliação e modelagem reológica de fluido de perfuração base água . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15751.

Council of Science Editors:

Melo KCd. Avaliação e modelagem reológica de fluido de perfuração base água . [Masters Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15751

Universidade do Rio Grande do Norte

4. Pegado, Roberta de Melo. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15762

► The development of new fuels is an important field of scientific and technological activities, since much of the energy consumed in the world is obtained… (more)

▼ The development of new fuels is an important field of scientific and technological activities, since much of the energy consumed in the world is obtained from oil, coal and natural gas, and these sources are limited and not renewable. Recently it has assessed the employment of microemulsions as an alternative for obtaining fuel isotropic between phases originally not miscible. Among many advantages, emphasizes the application of substances that provide the reduction of levels of emissions compared to fossil fuels. Thus, this work was a study of various microemulsified systems, aiming to check the performance of the winsor regions front of the use of surfactants: RENEX 18 → 150, UNITOL L-60 → L-100 and AMIDA 60, together with structure of esters from soybean and castor bean oils. From the results it were chosen four systems to physico-chemical analyzes: System I RENEX 60, Soil bean oil, methylic ester (EMOS) and water; System II RENEX 60/AMIDA 60, EMOS and water; System III RENEX 70, mamona oil methylic ester (EMOM) and water and System IV RENEX 95, EMOM and water. The tests of physico-chemical characterization and study of temperature increase were done with nine points with different compositions in a way to include the interest area (microemulsion W/O). After this study, was conducted a modeling to predict the viscosity, the property is more varied as function of compositions systems changes. The best results were the systems II and IV with a temperature stability above 60°C. The system I had its physico-chemical characterization very similar to a fossil fuel. The system II was the best one due to its corrosivity be stable. In the modeling the four systems had shown good, with an error that varied between 5 and 18%, showing to be possible the viscosity prediction from the composition of the system. The effects the microemulsion and the engine´s performance with the microemulsion were also avaliated. The tests were performed in a cycle-diesel engine. The potency and consumption were analysed. Results show a slight increase the rendiment fuel compared with the conventional as well as a decrease in specific consumption Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Biocombustível; Microemulsão; Tensoativo; Viscosidade; Propriedades físico-químicas; Modelagem; Biofuels; Surfactant; Viscosity; Physico-chemical; Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pegado, R. d. M. (2008). Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15762

Chicago Manual of Style (16^th Edition):

Pegado, Roberta de Melo. “Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .” 2008. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15762.

MLA Handbook (7^th Edition):

Pegado, Roberta de Melo. “Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .” 2008. Web. 20 Nov 2019.

Vancouver:

Pegado RdM. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15762.

Council of Science Editors:

Pegado RdM. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . [Masters Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15762

Universidade do Rio Grande do Norte

5. Silva Filho, Luiz Ferreira da. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15773

► Natural gas, although basically composed by light hydrocarbons, also presents in its composition gaseous contaminants such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). Hydrogen… (more)

▼ Natural gas, although basically composed by light hydrocarbons, also presents in its composition gaseous contaminants such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). Hydrogen sulfide, which commonly occurs in oil and gas exploration and production activities, besides being among the gases that are responsible by the acid rain and greenhouse effect, can also cause serious harm to health, leading even to death, and damages to oil and natural gas pipelines. Therefore, the removal of hydrogen sulfide will significantly reduce operational costs and will result in oil with best quality to be sent to refinery, thereby resulting in economical, environmental, and social benefits. These factors highlight the need for the development and improvement of hydrogen sulfide sequestrating agents to be used in the oil industry. Nowadays there are several procedures for hydrogen sulfide removal from natural gas used by the petroleum industry. However, they produce derivatives of amines that are harmful to the distillation towers, form insoluble precipitates that cause pipe clogging and produce wastes of high environmental impact. Therefore, the obtaining of a stable system, in inorganic or organic reaction media, that is able to remove hydrogen sulfide without forming by-products that affect the quality and costs of natural gas processing, transport and distribution is of great importance. In this context, the evaluation of the kinetics of H2S removal is a valuable procedure for the treatment of natural gas and disposal of the byproducts generated by the process. This evaluation was made in an absorption column packed with Raschig ring, where natural gas with H2S passes through a stagnant solution, being the contaminant absorbed by it. The content of H2S in natural gas in column output was monitored by an H2S analyzer. The comparison between the obtained curves and the study of the involved reactions have not only allowed to determine the efficiency and mass transfer controlling step of the involved processes but also make possible to effect a more detailed kinetic study and evaluate the commercial potential of each reagent Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Absorção; Gás natural; Dessulfurização; Cinética de absorção; Absorption; Natural gas; Desulfurization; Absorption kinetics

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APA (6^th Edition):

Silva Filho, L. F. d. (2009). Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15773

Chicago Manual of Style (16^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .” 2009. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15773.

MLA Handbook (7^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .” 2009. Web. 20 Nov 2019.

Vancouver:

Silva Filho LFd. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15773.

Council of Science Editors:

Silva Filho LFd. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . [Masters Thesis]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15773

Universidade do Rio Grande do Norte

6. Santos, Joselisse Soares de Carvalho. Aplicação de ultrassons no deslocamento de petróleo em meio poroso .

Degree: 2010, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15805

► The objective of this study was to evaluate the displacement of petroleum/diesel solutions, at different concentrations, observing the effect of ultrasonic vibrations in fluids present… (more)

Subjects/Keywords: Deslocamento de petróleo; Vibração ultrassônica; Viscosidade; Oil displacement; Ultrasonic vibration; Viscosity

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APA (6^th Edition):

Santos, J. S. d. C. (2010). Aplicação de ultrassons no deslocamento de petróleo em meio poroso . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15805

Chicago Manual of Style (16^th Edition):

Santos, Joselisse Soares de Carvalho. “Aplicação de ultrassons no deslocamento de petróleo em meio poroso .” 2010. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15805.

MLA Handbook (7^th Edition):

Santos, Joselisse Soares de Carvalho. “Aplicação de ultrassons no deslocamento de petróleo em meio poroso .” 2010. Web. 20 Nov 2019.

Vancouver:

Santos JSdC. Aplicação de ultrassons no deslocamento de petróleo em meio poroso . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2010. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15805.

Council of Science Editors:

Santos JSdC. Aplicação de ultrassons no deslocamento de petróleo em meio poroso . [Masters Thesis]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/15805

Universidade do Rio Grande do Norte

7. Fontana, Josilma Fátima. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .

Degree: 2011, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15816

► The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants.… (more)

▼ The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants. Carnauba wax is the unique among the natural waxes to have a combination of properties of great importance. In previous studies it was verified the presence of metals in wax composition that can harm the oxidative stability of lubricants. Considering these factors, it was decided to develop a research to evaluate iron removal from carnauba wax, using microemulsion systems (Me) and perform the optimization of parameters, such as: extraction pH, temperature, extraction time, among others. Iron concentration was determined by atomic absorption and, to perform this analysis, sample digestion in microwave oven was used, showing that this process was very efficient. It was performed some analysis in order to characterize the wax sample, such as: attenuated total reflectance infrared spectroscopy (ATR-IR), thermogravimetry (TG), differential scanning calorimetry (DSC), energy dispersive X-ray fluorescence (EDXRF), scanning electron microscopy (SEM) and melting point (FP). The microemulsion systems were composed by: coconut oil as surfactant, n-butanol as cosurfactant, kerosene and/or heptanes as oil phase, distilled water as water phase. The pH chosen for this study was 4.5 and the metal extraction was performed in finite experiments. To evaluate Me extraction it was performed a factorial design for systems with heptane and kerosene as oil phase, also investigating the influence of temperature time and wax/Me ratio, that showed an statistically significant answer for iron extraction at 95% confidence level. The best result was obtained at 60°C, 10 hours contact time and 1: 10 wax/Me ratio, in both systems with kerosene and heptanes as oil phase. The best extraction occurred with kerosene as oil phase, with 54% iron removal Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor).

Subjects/Keywords: Microemulsão; Extração; Ferro; Cera de carnaúba; Biolubrificante; Microemulsions; Extraction; Iron; Carnauba wax; Biolubricant

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fontana, J. F. (2011). Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15816

Chicago Manual of Style (16^th Edition):

Fontana, Josilma Fátima. “Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .” 2011. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15816.

MLA Handbook (7^th Edition):

Fontana, Josilma Fátima. “Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .” 2011. Web. 20 Nov 2019.

Vancouver:

Fontana JF. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15816.

Council of Science Editors:

Fontana JF. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . [Masters Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15816

Universidade do Rio Grande do Norte

8. Aum, Yanne Katiussy Pereira Gurgel. Modelagem e simulação da deposição de parafinas em escoamento turbulento .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15820

► The flow assurance has become one of the topics of greatest interest in the oil industry, mainly due to production and transportation of oil in… (more)

▼ The flow assurance has become one of the topics of greatest interest in the oil industry, mainly due to production and transportation of oil in regions with extreme temperature and pressure. In these operations the wax deposition is a commonly problem in flow of paraffinic oils, causing the rising costs of the process, due to increased energy cost of pumping, decreased production, increased pressure on the line and risk of blockage of the pipeline. In order to describe the behavior of the wax deposition phenomena in turbulent flow of paraffinic oils, under different operations conditions, in this work we developed a simulator with easy interface. For that we divided de work in four steps: (i) properties estimation (physical, thermals, of transport and thermodynamics) of n-alkanes and paraffinic mixtures by using correlations; (ii) obtainment of the solubility curve and determination the wax appearance temperature, by calculating the solid-liquid equilibrium of parafinnic systems; (iii) modelling wax deposition process, comprising momentum, mass and heat transfer; (iv) development of graphic interface in MATLAB® environment for to allow the understanding of simulation in different flow conditions as well as understand the matter of the variables (inlet temperature, external temperature, wax appearance temperature, oil composition, and time) on the behavior of the deposition process. The results showed that the simulator developed, called DepoSim, is able to calculate the profile of temperature, thickness of the deposit, and the amount of wax deposited in a simple and fast way, and also with consistent results and applicable to the operation Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Deposição; Parafinas; Modelagem; Simulação; Deposition; Wax; Modeling; Simulation

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APA (6^th Edition):

Aum, Y. K. P. G. (2012). Modelagem e simulação da deposição de parafinas em escoamento turbulento . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15820

Chicago Manual of Style (16^th Edition):

Aum, Yanne Katiussy Pereira Gurgel. “Modelagem e simulação da deposição de parafinas em escoamento turbulento .” 2012. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15820.

MLA Handbook (7^th Edition):

Aum, Yanne Katiussy Pereira Gurgel. “Modelagem e simulação da deposição de parafinas em escoamento turbulento .” 2012. Web. 20 Nov 2019.

Vancouver:

Aum YKPG. Modelagem e simulação da deposição de parafinas em escoamento turbulento . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15820.

Council of Science Editors:

Aum YKPG. Modelagem e simulação da deposição de parafinas em escoamento turbulento . [Masters Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15820

Universidade do Rio Grande do Norte

9. Valença, Raniere Dantas. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15822

► The treatment of oil produced water and its implications are continually under investigation and several questions are related to this subject. In the Northeast Region… (more)

Subjects/Keywords: Água de produção; Flotação; Tensoativo; Modelagem.; Oil produced water; Flotation; Surfactant; Modeling.

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APA (6^th Edition):

Valença, R. D. (2012). Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15822

Chicago Manual of Style (16^th Edition):

Valença, Raniere Dantas. “Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .” 2012. Masters Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15822.

MLA Handbook (7^th Edition):

Valença, Raniere Dantas. “Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .” 2012. Web. 20 Nov 2019.

Vancouver:

Valença RD. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15822.

Council of Science Editors:

Valença RD. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . [Masters Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15822

Universidade do Rio Grande do Norte

10. Lima, Lêda Maria Oliveira de. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15893

► Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a… (more)

▼ Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a surfactant derived from coconut oil (SCO saponified coconut oil) in the recovery process of organic compounds that are present in oily effluents from petroleum industry. For this end, experiments were accomplished in a column of small dimension objectifying to verify the influence of the surfactant SCO in the efficiency of oil removal. This way, they were prepared emulsions with amount it fastens of oil (50, 100, 200 and 400 ppm), being determined the great concentrations of surfactant for each one of them. Some rehearsals were still accomplished with produced water of the industry of the petroleum to compare the result with the one of the emulsions. According to the experiments, it was verified that an increase of the surfactant concentration does not implicate in a greater oil removal. The separation process use gaseous bubbles formed when a gas stream pass a liquid column, when low surfactant concentrations are used, it occurs the coalescence of the dispersed oil droplets and their transport to the top of the column, forming a new continuous phase. Such surfactants lead to a gas-liquid interface saturation, depending on the used surfactant concentration, affecting the flotation process and influencing in the removal capacity of the oily dispersed phase. A porous plate filter, with pore size varying from 40 to 250 mm, was placed at the base of the column to allow a hydrodynamic stable operation. During the experimental procedures, the operating volume of phase liquid was held constant and the rate of air flow varied in each experiment. The resulting experimental of the study hydrodynamic demonstrated what the capturing of the oil was influenced by diameter of the bubbles and air flow. With the increase flow of 300 about to 900 cm3.min-1, occurred an increase in the removal of oil phase of 44% about to 66% and the removal kinetic of oil was defined as a reaction of 1° order Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Flotação; Efluentes oleosos; Petróleo; Óleo de coco; Tensoativo; Flotation; Oily effluents; Petroleum; Coconut oil; Surfactant

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APA (6^th Edition):

Lima, L. M. O. d. (2009). Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15893

Chicago Manual of Style (16^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2009. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15893.

MLA Handbook (7^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2009. Web. 20 Nov 2019.

Vancouver:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15893.

Council of Science Editors:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15893

Universidade do Rio Grande do Norte

11. Fernandes, Manoel Reginaldo. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .

Degree: 2011, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15909

► The industry, over the years, has been working to improve the efficiency of diesel engines. More recently, it was observed the need to reduce pollutant… (more)

▼ The industry, over the years, has been working to improve the efficiency of diesel engines. More recently, it was observed the need to reduce pollutant emissions to conform to the stringent environmental regulations. This has attached a great interest to develop researches in order to replace the petroleum-based fuels by several types of less polluting fuels, such as blends of diesel oil with vegetable oil esters and diesel fuel with vegetable oils and alcohol, emulsions, and also microemulsions. The main objective of this work was the development of microemulsion systems using nonionic surfactants that belong to the Nonylphenols ethoxylated group and Lauric ethoxylated alcohol group, ethanol/diesel blends, and diesel/biodiesel blends for use in diesel engines. First, in order to select the microemulsion systems, ternary phase diagrams of the used blends were obtained. The systems were composed by: nonionic surfactants, water as polar phase, and diesel fuel or diesel/biodiesel blends as apolar phase. The microemulsion systems and blends, which represent the studied fuels, were characterized by density, viscosity, cetane number and flash point. It was also evaluated the effect of temperature in the stability of microemulsion systems, the performance of the engine, and the emissions of carbon monoxide, nitrogen oxides, unburned hydrocarbons, and smoke for all studied blends. Tests of specific fuel consumption as a function of engine power were accomplished in a cycle diesel engine on a dynamometer bench and the emissions were evaluated using a GreenLine 8000 analyzer. The obtained results showed a slight increase in fuel consumption when microemulsion systems and diesel/biodiesel blends were burned, but it was observed a reduction in the emission of nitrogen oxides, unburned hydrocarbons, smoke index and f sulfur oxides Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Diesel; Biodiesel; Emissões de poluentes; Motor diesel; Combustível alternativo; Diesel microemulsionado; ; Surfactant; Biodiesel; Pollutant emission; Diesel engine; Alternative fuel; Diesel-based microemulsion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fernandes, M. R. (2011). Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15909

Chicago Manual of Style (16^th Edition):

Fernandes, Manoel Reginaldo. “Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .” 2011. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15909.

MLA Handbook (7^th Edition):

Fernandes, Manoel Reginaldo. “Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .” 2011. Web. 20 Nov 2019.

Vancouver:

Fernandes MR. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15909.

Council of Science Editors:

Fernandes MR. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15909

Universidade do Rio Grande do Norte

12. Silva Filho, Luiz Ferreira da. Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15926

► Natural gas, although basically composed by light hydrocarbons, also presents contaminant gases in its composition, such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). The… (more)

▼ Natural gas, although basically composed by light hydrocarbons, also presents contaminant gases in its composition, such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). The H2S, which commonly occurs in oil and gas exploration and production activities, causes damages in oil and natural gas pipelines. Consequently, the removal of hydrogen sulfide gas will result in an important reduction in operating costs. Also, it is essential to consider the better quality of the oil to be processed in the refinery, thus resulting in benefits in economic, environmental and social areas. All this facts demonstrate the need for the development and improvement in hydrogen sulfide scavengers. Currently, the oil industry uses several processes for hydrogen sulfide removal from natural gas. However, these processes produce amine derivatives which can cause damage in distillation towers, can cause clogging of pipelines by formation of insoluble precipitates, and also produce residues with great environmental impact. Therefore, it is of great importance the obtaining of a stable system, in inorganic or organic reaction media, able to remove hydrogen sulfide without formation of by-products that can affect the quality and cost of natural gas processing, transport, and distribution steps. Seeking the study, evaluation and modeling of mass transfer and kinetics of hydrogen removal, in this study it was used an absorption column packed with Raschig rings, where the natural gas, with H2S as contaminant, passed through an aqueous solution of inorganic compounds as stagnant liquid, being this contaminant gas absorbed by the liquid phase. This absorption column was coupled with a H2S detection system, with interface with a computer. The data and the model equations were solved by the least squares method, modified by Levemberg-Marquardt. In this study, in addition to the water, it were used the following solutions: sodium hydroxide, potassium permanganate, ferric chloride, copper sulfate, zinc chloride, potassium chromate, and manganese sulfate, all at low concentrations (»10 ppm). These solutions were used looking for the evaluation of the interference between absorption physical and chemical parameters, or even to get a better mass transfer coefficient, as in mixing reactors and absorption columns operating in counterflow. In this context, the evaluation of H2S removal arises as a valuable procedure for the treatment of natural gas and destination of process by-products. The study of the obtained absorption curves makes possible to determine the mass transfer predominant stage in the involved processes, the mass transfer volumetric coefficients, and the equilibrium concentrations. It was also performed a kinetic study. The obtained results showed that the H2S removal kinetics is greater for NaOH. Considering that the study was performed at low concentrations of chemical reagents, it was possible to check the effect of secondary reactions in the other chemicals, especially in the case of KMnO4, which shows that your by-product, MnO2, acts in… Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Absorção química. Sulfeto de hidrogênio. Gás natural. Transferência de massa; Chemical absorption. Desulphurisation. Natural gas. Mass transfer

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APA (6^th Edition):

Silva Filho, L. F. d. (2013). Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15926

Chicago Manual of Style (16^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado .” 2013. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15926.

MLA Handbook (7^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado .” 2013. Web. 20 Nov 2019.

Vancouver:

Silva Filho LFd. Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2013. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15926.

Council of Science Editors:

Silva Filho LFd. Avaliação e modelagem da absorção de H2S do gás natural em coluna de leito estagnado . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15926

Universidade do Rio Grande do Norte

13. Duarte, Kahildete Rodrigues Forte. Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões .

Degree: 2014, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15933

► The diesel combustion form sulfur oxides that can be discharged into the atmosphere as particulates and primary pollutants, SO2and SO3, causing great damage to the… (more)

▼ The diesel combustion form sulfur oxides that can be discharged into the atmosphere as particulates and primary pollutants, SO2and SO3, causing great damage to the environment and to human health. These products can be transformed into acids in the combustion chamber, causing damage to the engines. The worldwide concern with a clean and healthy environment has led to more restrictive laws and regulations regulating the emission levels of pollutants in the air, establishing sulfur levels increasingly low on fuels. The conventional methods for sulfur removal from diesel are expensive and do not produce a zero-level sulfur fuel. This work aims to develop new methods of removing sulfur from commercial diesel using surfactants and microemulsion systems. Its main purpose is to create new technologies and add economic viability to the process. First, a preliminary study using as extracting agent a Winsor I microemulsion system with dodecyl ammonium chloride (DDACl) and nonyl phenol ethoxylated (RNX95) as surfactant was performed to choose the surfactant. The RNX95 was chosen to be used as surfactant in microemulsioned systems for adsorbent surface modification and as an extracting agent in liquid-liquid extraction. Vermiculite was evaluated as adsorbent. The microemulsion systems applied for vermiculite surface modification were composed by RNX95 (surfactant), n-butanol (cosurfactant), n-hexane (oil phase), and different aqueous phases, including: distilled water (aqueous phase),20ppm CaCl2solution, and 1500ppm CaCl2solution. Batch and column adsorption tests were carried out to estimate the ability of vermiculite to adsorb sulfur from diesel. It was used in the experiments a commercial diesel fuel with 1,233ppm initial sulfur concentration. The batch experiments were performed according to a factorial design (23). Two experimental sets were accomplished: the first one applying 1:2 vermiculite to diesel ratio and the second one using 1:5 vermiculite to diesel ratio. It was evaluated the effects of temperature (25°C and 60°C), concentration of CaCl2in the aqueous phase (20ppm and 1500ppm), and vermiculite granule size (65 and 100 mesh). The experimental response was the ability of vermiculite to adsorb sulfur. The best results for both 1:5 and 1:2 ratios were obtained using 60°C, 1500ppm CaCl2solution, and 65 mesh. The best adsorption capacities for 1:5 ratio and for 1:2 ratio were 4.24 mg sulfur/g adsorbent and 2.87 mg sulfur/g adsorbent, respectively. It was verified that the most significant factor was the concentration of the CaCl2 solution. Liquid-liquid extraction experiments were performed in two and six steps using the same surfactant to diesel ratio. It was obtained 46.8% sulfur removal in two-step experiment and 73.15% in six-step one. An alternative study, for comparison purposes, was made using bentonite and diatomite… Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor).

Subjects/Keywords: Diesel. Remoção de enxofre. Adsorção. Vermiculita. Tensoativos. Microemulsão; Diesel. Sulfur removal. Adsorption. Vermiculite. Surfactants. microemulsion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Duarte, K. R. F. (2014). Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15933

Chicago Manual of Style (16^th Edition):

Duarte, Kahildete Rodrigues Forte. “Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões .” 2014. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15933.

MLA Handbook (7^th Edition):

Duarte, Kahildete Rodrigues Forte. “Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões .” 2014. Web. 20 Nov 2019.

Vancouver:

Duarte KRF. Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2014. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15933.

Council of Science Editors:

Duarte KRF. Novas alternativas de remoção de enxofre do óleo diesel utilizando tensoativos e microemulsões . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2014. Available from: http://repositorio.ufrn.br/handle/123456789/15933

Universidade do Rio Grande do Norte

14. Lucena, Izabelly Larissa. Influência de tensoativos não iônicos na destilação molecular de petróleo .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/18560

► The molecular distillation is show as an alternative for separation and purification of various kinds of materials. The process is a special case of evaporation… (more)

▼ The molecular distillation is show as an alternative for separation and purification of various kinds of materials. The process is a special case of evaporation at high vacuum, in the order from 0.001 to 0.0001 mmHg and therefore occurs at relatively lower temperatures, preserves the material to be purified. In Brazil, molecular distillation is very applied in the separation of petroleum fractions. However, most studies evaluated the temperature of the evaporator, condenser temperature and flow such variables of the molecular distillation oil. Then, to increase the degree of recovery of the fraction of the distillate obtained in the process of the molecular distillation was evaluated the use nonionic surfactants of the class of nonylphenol ethoxylate, molecules able to interact in the liquid-liquid and liquid-vapor interface various systems. In this context, the aim of this work was to verify the influence of commercial surfactant (Ultranex-18 an Ultranex-18-50) in the molecular distillation of a crude oil. The physicochemical characterization of the oil was realized and the petroleum shown an API gravity of 42°, a light oil. Initially, studied the molecular distillation without surfactant using star design experimental (2H ± ) evaluated two variables (evaporator temperature and condenser temperature) and answer variable was the percentage in distillate obtained in the process (D%). The best experimental condition to molecular distillation oil (38% distillate) was obtained at evaporator and condenser temperatures of 120 °C and 10 ° C, respectively. Subsequently, to determine the range of surfactant concentration to be applied in the process, was determined the critical micellar concentration by the technique of scattering X-ray small angle (SAXS). The surfactants Ultranex-18 an Ultranex-18-50 shown the critical micelle concentration in the range of 10-2 mol/L in the hydrocarbons studied. Then, was applied in the study of distillation a concentration range from 0.01 to 0.15 mol/L of the surfactants (Ultranex- 18 and 50). The use of the nonionic surfactant increased the percentage of hydrocarbons in the range from 5 to 9 carbons in comparison to the process carried out without surfactant, and in some experimental conditions the fraction of light compounds in the distilled was over 700% compared to the conventional process. The study showed that increasing the degree of ethoxylation of Ultranex18 to Ultranex-50, the compounds in the range of C5 to C9 reduced the percentage in the distilled, since the increase of the hydrophilic part of the surfactant reduces its solubility in the oil. Finally, was obtained an increase in the degree of recovery of light hydrocarbons, comparing processes with and without surfactant, obtained an increase of 10% and 4% with Ultranex-18 and Ultranex-50, respectively. Thus, it is concluded that the Ultranex- 18 surfactant showed a higher capacity to distillation compared with Ultranex-50 and the application of surfactant on the molecular distillation from… Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor).

Subjects/Keywords: Destilação molecular. Petróleo. Tensoativo não iônico. Fração do destilado. Fração do resíduo. Cromatografia e SAXS; Molecular distillation. Oil. Nonionic surfactant. Fraction of the distillate. Fraction of residue. Chromatography and SAXS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lucena, I. L. (2013). Influência de tensoativos não iônicos na destilação molecular de petróleo . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/18560

Chicago Manual of Style (16^th Edition):

Lucena, Izabelly Larissa. “Influência de tensoativos não iônicos na destilação molecular de petróleo .” 2013. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/18560.

MLA Handbook (7^th Edition):

Lucena, Izabelly Larissa. “Influência de tensoativos não iônicos na destilação molecular de petróleo .” 2013. Web. 20 Nov 2019.

Vancouver:

Lucena IL. Influência de tensoativos não iônicos na destilação molecular de petróleo . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2013. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/18560.

Council of Science Editors:

Lucena IL. Influência de tensoativos não iônicos na destilação molecular de petróleo . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/18560

Universidade do Rio Grande do Norte

15. Ribeiro Neto, Valdir Cotrim. Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo .

Degree: 2007, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15740

► Petroleum is a complex combination of various classes of hydrocarbons, with paraffinic, naphtenic and aromatic compounds being those more commonly found in its composition. The… (more)

▼ Petroleum is a complex combination of various classes of hydrocarbons, with paraffinic, naphtenic and aromatic compounds being those more commonly found in its composition. The recent changes in the world scenario, the large reserves of heavy oils and also the lack of new discoveries of large petroleum fields are indications that, in the near future, the oil recovery by conventional methods will be limited. In order to increase the efficiency of the extraction process, enhanced recovery methods are cited in applications where conventional techniques have proven to be little effective. The injection of surfactant solutions as an enhanced recovery method is advantageous in that surfactants are able to reduce the interfacial tensions between water and oil, thus augmenting the displacement efficiency and, as a consequence, increasing the recovery factor. This work aims to investigate the effects of some parameters that influence the surfactant behavior in solution, namely the type of surfactant, the critical micelle concentration (CMC) and the surface and interface tensions between fluids. Seawater solutions containing the surfactants PAN, PHN and PJN have been prepared for presenting lower interfacial tensions with petroleum and higher stability under increasing temperature and salinity. They were examined in an experimental apparatus designed to assess the recovery factor. Botucatu (Brazil) sandstone plug samples were submitted to assay steps comprising saturation with seawater and petroleum, conventional recovery with seawater and enhanced recovery with surfactant solutions. The plugs had porosity between 29.6 and 32.0%, with average effective permeability to water of 83 mD. The PJN surfactant, at a concentration 1000% above CMC in water, had a higher recovery factor, causing the original oil in place to be recovered by an extra 20.97%, after conventional recovery with seawater Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Tensoativo; Petróleo; Recuperação avançada; CMC; Tensão interfacial; Surfactant; Petroleum; Enhanced recovery; CMC; Interfacial tensions

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ribeiro Neto, V. C. (2007). Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15740

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ribeiro Neto, Valdir Cotrim. “Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo .” 2007. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15740.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ribeiro Neto, Valdir Cotrim. “Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo .” 2007. Web. 20 Nov 2019.

Vancouver:

Ribeiro Neto VC. Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2007. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15740.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ribeiro Neto VC. Desenvolvimento de sistemas a base de tensoativos para recuperação avançada de petróleo . [Thesis]. Universidade do Rio Grande do Norte; 2007. Available from: http://repositorio.ufrn.br/handle/123456789/15740

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

16. Silva, Paula Katherine Leonez da. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15743

► In the petroleum industry, water is always present in the reservoir formation together with petroleum and natural gas and this fact provokes the production of… (more)

▼ In the petroleum industry, water is always present in the reservoir formation together with petroleum and natural gas and this fact provokes the production of water with petroleum, resulting in a great environmental impact. Several methods can be applied for treatment of oily waters, such as: gravitational vases, granulated media filtration systems, flotation process, centrifugation process and the use of hydrocyclones, which can also be used in a combined way. However, the flotation process has showed a great efficiency as compared with other methods, because these methods do not remove great part of the emulsified oil. In this work was investigated the use of surfactants derived from vegetable oils, OSS and OGS, as collectors, using the flotation process in a glass column with a porous plate filter in its base for the input of the gaseous steam. For this purpose, oil/water emulsions were prepared using mechanical stirring, with concentrations around 300 ppm. The air flow rate was set at 700 cm3/min and the porous plate filter used for the generation of the air bubbles has pore size varying from 16 to 40 Pm. The column operated at constant volume (1500mL). A new methodology has been developed to collect the samples, where, instead of collecting the water phase, it was collected the oil phase removed by the process in the top of the flotation column. It has been observed that it is necessary to find an optimum surfactant concentration to achieve enhanced removal efficiency. Being for OSS 1.275 mmol/L and for OGS 0.840 mmol/L, with removal efficiencies of 93% and 99%, respectively, using synthetic solutions. For the produced water, the removal in these concentrations was 75% for OSS and 65% for OGS. It is possible to remove oil from water in a flotation process using surfactants of high HLB, fact that is against the own definition of HLB (Hydrophile-Lipophile Balance). The interfacial tension is an important factor in the oil removal process using a flotation process, because it has direct interference in the coalescence of the oil drops. The spreading of the oil of the air bubble should be considered in the process, and for the optimum surfactant concentrations it reached a maximum value. The removal kinetics for the flotation process using surfactants in the optimum concentration has been adjusted according to a first order model, for synthetic water as for the produced water. Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Melo, Josette Lourdes de Sousa (advisor), CPF:10200720406 (advisor), do%3Fid%3DK4787094H6%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787094H6 (advisor).

Subjects/Keywords: Efluentes oleosos; Flotação; Tensoativo; Tensão interfacial; Coeficiente de espalhamento; Oily effluents; Flotation; Surfactant; Interfacial tension; Spreading coefficients

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Silva, P. K. L. d. (2008). Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15743

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Silva, Paula Katherine Leonez da. “Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .” 2008. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15743.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Silva, Paula Katherine Leonez da. “Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal .” 2008. Web. 20 Nov 2019.

Vancouver:

Silva PKLd. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15743.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva PKLd. Remoção de óleo da água de produção por flotação em coluna utilizando tensoativos de origem vegetal . [Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15743

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

17. Melo, Klismeryane Costa de. Avaliação e modelagem reológica de fluido de perfuração base água .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15751

► The determination of the rheology of drilling fluids is of fundamental importance to select the best composition and the best treatment to be applied in… (more)

▼ The determination of the rheology of drilling fluids is of fundamental importance to select the best composition and the best treatment to be applied in these fluids. This work presents a study of the rheological behavior of some addictives used as viscosifiers in water-based drilling fluids. The evaluated addictives were: Carboxymethylcellulose (CMC), Xanthan gum (GX), and Bentonite. The main objective was to rheologically characterize suspensions composed by these addictives, by applying mathematical models for fluid flow behavior, in order to determine the best flow equation to represent the system, as well as the model parameters. The mathematical models applied in this research were: the Bingham Model, the Ostwald de Wale Model, and the Herschel-Bulkley Model. A previous study of hydration time for each used addictive was accomplished seeking to evaluate the effect of polymer and clay hydration on rheological behavior of the fluid. The rheological characterization was made through typical rheology experiments, using a coaxial cylinder viscosimeter, where the flow curves and the thixotropic magnitude of each fluid was obtained. For each used addictive the rheological behavior as a function of temperature was also evaluated as well as fluid stability as a function of the concentration and kind of addictive used. After analyses of results, mixtures of polymer and clay were made seeking to evaluate the rheological modifications provided by the polymer incorporation in the water + bentonite system. The obtained results showed that the Ostwald de Waale model provided the best fit for fluids prepared using CMC and for fluids with Xanthan gum and Bentonite the best fit was given by the Herschel-Bulkley one Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Fluído de perfuração; Reologia; Polímeros; Drilling fluids; Rheology; Polymers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Melo, K. C. d. (2008). Avaliação e modelagem reológica de fluido de perfuração base água . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Melo, Klismeryane Costa de. “Avaliação e modelagem reológica de fluido de perfuração base água .” 2008. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Melo, Klismeryane Costa de. “Avaliação e modelagem reológica de fluido de perfuração base água .” 2008. Web. 20 Nov 2019.

Vancouver:

Melo KCd. Avaliação e modelagem reológica de fluido de perfuração base água . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15751.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Melo KCd. Avaliação e modelagem reológica de fluido de perfuração base água . [Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15751

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

18. Pegado, Roberta de Melo. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .

Degree: 2008, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15762

► The development of new fuels is an important field of scientific and technological activities, since much of the energy consumed in the world is obtained… (more)

▼ The development of new fuels is an important field of scientific and technological activities, since much of the energy consumed in the world is obtained from oil, coal and natural gas, and these sources are limited and not renewable. Recently it has assessed the employment of microemulsions as an alternative for obtaining fuel isotropic between phases originally not miscible. Among many advantages, emphasizes the application of substances that provide the reduction of levels of emissions compared to fossil fuels. Thus, this work was a study of various microemulsified systems, aiming to check the performance of the winsor regions front of the use of surfactants: RENEX 18 → 150, UNITOL L-60 → L-100 and AMIDA 60, together with structure of esters from soybean and castor bean oils. From the results it were chosen four systems to physico-chemical analyzes: System I RENEX 60, Soil bean oil, methylic ester (EMOS) and water; System II RENEX 60/AMIDA 60, EMOS and water; System III RENEX 70, mamona oil methylic ester (EMOM) and water and System IV RENEX 95, EMOM and water. The tests of physico-chemical characterization and study of temperature increase were done with nine points with different compositions in a way to include the interest area (microemulsion W/O). After this study, was conducted a modeling to predict the viscosity, the property is more varied as function of compositions systems changes. The best results were the systems II and IV with a temperature stability above 60°C. The system I had its physico-chemical characterization very similar to a fossil fuel. The system II was the best one due to its corrosivity be stable. In the modeling the four systems had shown good, with an error that varied between 5 and 18%, showing to be possible the viscosity prediction from the composition of the system. The effects the microemulsion and the engine´s performance with the microemulsion were also avaliated. The tests were performed in a cycle-diesel engine. The potency and consumption were analysed. Results show a slight increase the rendiment fuel compared with the conventional as well as a decrease in specific consumption Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Biocombustível; Microemulsão; Tensoativo; Viscosidade; Propriedades físico-químicas; Modelagem; Biofuels; Surfactant; Viscosity; Physico-chemical; Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pegado, R. d. M. (2008). Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15762

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pegado, Roberta de Melo. “Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .” 2008. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15762.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pegado, Roberta de Melo. “Estudo das propriedades físico-químicas de biocombustíveis microemulsionados .” 2008. Web. 20 Nov 2019.

Vancouver:

Pegado RdM. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2008. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15762.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pegado RdM. Estudo das propriedades físico-químicas de biocombustíveis microemulsionados . [Thesis]. Universidade do Rio Grande do Norte; 2008. Available from: http://repositorio.ufrn.br/handle/123456789/15762

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

19. Silva Filho, Luiz Ferreira da. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15773

► Natural gas, although basically composed by light hydrocarbons, also presents in its composition gaseous contaminants such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). Hydrogen… (more)

▼ Natural gas, although basically composed by light hydrocarbons, also presents in its composition gaseous contaminants such as CO2 (carbon dioxide) and H2S (hydrogen sulfide). Hydrogen sulfide, which commonly occurs in oil and gas exploration and production activities, besides being among the gases that are responsible by the acid rain and greenhouse effect, can also cause serious harm to health, leading even to death, and damages to oil and natural gas pipelines. Therefore, the removal of hydrogen sulfide will significantly reduce operational costs and will result in oil with best quality to be sent to refinery, thereby resulting in economical, environmental, and social benefits. These factors highlight the need for the development and improvement of hydrogen sulfide sequestrating agents to be used in the oil industry. Nowadays there are several procedures for hydrogen sulfide removal from natural gas used by the petroleum industry. However, they produce derivatives of amines that are harmful to the distillation towers, form insoluble precipitates that cause pipe clogging and produce wastes of high environmental impact. Therefore, the obtaining of a stable system, in inorganic or organic reaction media, that is able to remove hydrogen sulfide without forming by-products that affect the quality and costs of natural gas processing, transport and distribution is of great importance. In this context, the evaluation of the kinetics of H2S removal is a valuable procedure for the treatment of natural gas and disposal of the byproducts generated by the process. This evaluation was made in an absorption column packed with Raschig ring, where natural gas with H2S passes through a stagnant solution, being the contaminant absorbed by it. The content of H2S in natural gas in column output was monitored by an H2S analyzer. The comparison between the obtained curves and the study of the involved reactions have not only allowed to determine the efficiency and mass transfer controlling step of the involved processes but also make possible to effect a more detailed kinetic study and evaluate the commercial potential of each reagent Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Absorção; Gás natural; Dessulfurização; Cinética de absorção; Absorption; Natural gas; Desulfurization; Absorption kinetics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Silva Filho, L. F. d. (2009). Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .” 2009. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Silva Filho, Luiz Ferreira da. “Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção .” 2009. Web. 20 Nov 2019.

Vancouver:

Silva Filho LFd. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva Filho LFd. Avaliação da remoção de sulfeto de hidrogênio do gás natural em uma coluna de absorção . [Thesis]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

20. Santos, Joselisse Soares de Carvalho. Aplicação de ultrassons no deslocamento de petróleo em meio poroso .

Degree: 2010, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15805

► The objective of this study was to evaluate the displacement of petroleum/diesel solutions, at different concentrations, observing the effect of ultrasonic vibrations in fluids present… (more)

Subjects/Keywords: Deslocamento de petróleo; Vibração ultrassônica; Viscosidade; Oil displacement; Ultrasonic vibration; Viscosity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Santos, J. S. d. C. (2010). Aplicação de ultrassons no deslocamento de petróleo em meio poroso . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos, Joselisse Soares de Carvalho. “Aplicação de ultrassons no deslocamento de petróleo em meio poroso .” 2010. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos, Joselisse Soares de Carvalho. “Aplicação de ultrassons no deslocamento de petróleo em meio poroso .” 2010. Web. 20 Nov 2019.

Vancouver:

Santos JSdC. Aplicação de ultrassons no deslocamento de petróleo em meio poroso . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2010. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos JSdC. Aplicação de ultrassons no deslocamento de petróleo em meio poroso . [Thesis]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/15805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

21. Fontana, Josilma Fátima. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .

Degree: 2011, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15816

► The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants.… (more)

▼ The constant search for biodegradable materials for applications in several fields shows that carnauba wax can be a viable alternative in the manufacturing of biolubricants. Carnauba wax is the unique among the natural waxes to have a combination of properties of great importance. In previous studies it was verified the presence of metals in wax composition that can harm the oxidative stability of lubricants. Considering these factors, it was decided to develop a research to evaluate iron removal from carnauba wax, using microemulsion systems (Me) and perform the optimization of parameters, such as: extraction pH, temperature, extraction time, among others. Iron concentration was determined by atomic absorption and, to perform this analysis, sample digestion in microwave oven was used, showing that this process was very efficient. It was performed some analysis in order to characterize the wax sample, such as: attenuated total reflectance infrared spectroscopy (ATR-IR), thermogravimetry (TG), differential scanning calorimetry (DSC), energy dispersive X-ray fluorescence (EDXRF), scanning electron microscopy (SEM) and melting point (FP). The microemulsion systems were composed by: coconut oil as surfactant, n-butanol as cosurfactant, kerosene and/or heptanes as oil phase, distilled water as water phase. The pH chosen for this study was 4.5 and the metal extraction was performed in finite experiments. To evaluate Me extraction it was performed a factorial design for systems with heptane and kerosene as oil phase, also investigating the influence of temperature time and wax/Me ratio, that showed an statistically significant answer for iron extraction at 95% confidence level. The best result was obtained at 60°C, 10 hours contact time and 1: 10 wax/Me ratio, in both systems with kerosene and heptanes as oil phase. The best extraction occurred with kerosene as oil phase, with 54% iron removal Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor).

Subjects/Keywords: Microemulsão; Extração; Ferro; Cera de carnaúba; Biolubrificante; Microemulsions; Extraction; Iron; Carnauba wax; Biolubricant

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fontana, J. F. (2011). Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15816

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fontana, Josilma Fátima. “Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .” 2011. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15816.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fontana, Josilma Fátima. “Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados .” 2011. Web. 20 Nov 2019.

Vancouver:

Fontana JF. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15816.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fontana JF. Extração de ferro da cera de carnaúba utilizando sistemas microemulsionados . [Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15816

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

22. Aum, Yanne Katiussy Pereira Gurgel. Modelagem e simulação da deposição de parafinas em escoamento turbulento .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15820

► The flow assurance has become one of the topics of greatest interest in the oil industry, mainly due to production and transportation of oil in… (more)

▼ The flow assurance has become one of the topics of greatest interest in the oil industry, mainly due to production and transportation of oil in regions with extreme temperature and pressure. In these operations the wax deposition is a commonly problem in flow of paraffinic oils, causing the rising costs of the process, due to increased energy cost of pumping, decreased production, increased pressure on the line and risk of blockage of the pipeline. In order to describe the behavior of the wax deposition phenomena in turbulent flow of paraffinic oils, under different operations conditions, in this work we developed a simulator with easy interface. For that we divided de work in four steps: (i) properties estimation (physical, thermals, of transport and thermodynamics) of n-alkanes and paraffinic mixtures by using correlations; (ii) obtainment of the solubility curve and determination the wax appearance temperature, by calculating the solid-liquid equilibrium of parafinnic systems; (iii) modelling wax deposition process, comprising momentum, mass and heat transfer; (iv) development of graphic interface in MATLAB® environment for to allow the understanding of simulation in different flow conditions as well as understand the matter of the variables (inlet temperature, external temperature, wax appearance temperature, oil composition, and time) on the behavior of the deposition process. The results showed that the simulator developed, called DepoSim, is able to calculate the profile of temperature, thickness of the deposit, and the amount of wax deposited in a simple and fast way, and also with consistent results and applicable to the operation Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Deposição; Parafinas; Modelagem; Simulação; Deposition; Wax; Modeling; Simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aum, Y. K. P. G. (2012). Modelagem e simulação da deposição de parafinas em escoamento turbulento . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15820

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Aum, Yanne Katiussy Pereira Gurgel. “Modelagem e simulação da deposição de parafinas em escoamento turbulento .” 2012. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15820.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Aum, Yanne Katiussy Pereira Gurgel. “Modelagem e simulação da deposição de parafinas em escoamento turbulento .” 2012. Web. 20 Nov 2019.

Vancouver:

Aum YKPG. Modelagem e simulação da deposição de parafinas em escoamento turbulento . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15820.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Aum YKPG. Modelagem e simulação da deposição de parafinas em escoamento turbulento . [Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15820

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

23. Valença, Raniere Dantas. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15822

► The treatment of oil produced water and its implications are continually under investigation and several questions are related to this subject. In the Northeast Region… (more)

Subjects/Keywords: Água de produção; Flotação; Tensoativo; Modelagem.; Oil produced water; Flotation; Surfactant; Modeling.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Valença, R. D. (2012). Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15822

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Valença, Raniere Dantas. “Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .” 2012. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15822.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Valença, Raniere Dantas. “Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal .” 2012. Web. 20 Nov 2019.

Vancouver:

Valença RD. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15822.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Valença RD. Modelagem da transferência de massa na remoção do óleo da água produzida por flotação em coluna com uso de tensoativos de origem vegetal . [Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15822

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

24. Soares, Ana Paula Justino. Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15823

► The large investment in exploration activities offshore Brazil has generated new findings, generally in carbonate reservoirs, with different wettability conditions usually considered in the sandstone,… (more)

▼ The large investment in exploration activities offshore Brazil has generated new findings, generally in carbonate reservoirs, with different wettability conditions usually considered in the sandstone, strongly water-wet. In general, the carbonates reservoirs tend to be oil-wet, it difficult to mobilize of oil these reservoirs. These oils can be mobilized by different methods, or it may reverse the wettability of the surface of the reservoir and facilitate the flow of oil, improving production rates. Thus, the objective of this work was to study the influence of inversion on the wettability of the rock in the production and recovery of petroleum from carbonate reservoirs, using microemulsions. Three systems were chosen with different classes of surfactants: a cationic (C16TAB), an anionic (SDS) and nonionic (Unitol L90). Studies of the influence of salinity on the formation of the microemulsion as well as the characterization of fluids using density and viscosity measurements were also performed. To verify the potential of microemulsion systems in changing the wettability state of the chalk oil-wet to water-wet, contact angle measurements were performed using chalk of neutral-wet as surface material. Overall, with respect to the ionic character of the surfactants tested, the cationic surfactant (C16TAB) had a greater potential for reversal in wettability able to transform the rock wettability neutral to strongly water-wet, when compared with the anionic surfactant (SDS) and nonionic (Unitol L90), which showed similar behavior, improving the wettability of the rock to water. The microemulsions of all surfactants studied were effective in oil recovery, resulting in 76.92% for the system with C16TAB, 67.42% for the SDS and 66.30% for Unitol L90 of residual oil Advisors/Committee Members: Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: rocha carbonática; molhabilidade; recuperação avançada de petróleo; tensoativo; microemulsão; chalk; wettability; enhanced oil recovery; surfactant; microemulsion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soares, A. P. J. (2012). Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15823

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soares, Ana Paula Justino. “Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos .” 2012. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15823.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soares, Ana Paula Justino. “Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos .” 2012. Web. 20 Nov 2019.

Vancouver:

Soares APJ. Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15823.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soares APJ. Aplicação de microemulsão na recuperação de petróleo de reservatórios carbonáticos . [Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/15823

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

25. Paulino, Luísa Cimatti. Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo .

Degree: 2007, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15861

► Petroleum exists in the nature in certain underground formations where it is adsorbed into the rocks pores. For the conventional recovery methods usually only 30%… (more)

▼ Petroleum exists in the nature in certain underground formations where it is adsorbed into the rocks pores. For the conventional recovery methods usually only 30% of the oil is extracted and this can be credited, basically, to three aspects: high viscosity of the oil, geology of the formation and high interfacial tensions between the reservoir s fluids. The enhanced recovery methods use the injection of a fluid or fluids mixture in a reservoir to act in points where the conventional process didn't reach the recovery rates. Microemulsion flooding, considered an enhanced method, has the purpose to desorb the oil from the rock formation and to attain an efficient displacement of the oil emulsion. With this in mind, this work was accomplished with two main objectives: the study of the parameters effect that influence a microemulsified system (surfactant and cosurfactant types, C/S rate and salinity) and the evaluation of displacement efficiency with the microemulsions that showed stability in the rich aqueous area. For the analyzed parameters it was chose the microemulsions composition used in the recovery stage: 25% water, 5% kerosene, 46.7% of butanol as cosurfactant and 23.3% of BC or SCO cosurfactant. The core plugs of Assu and Botucatu sandstones were appraised in porosity and permeability tests and then submitted to the steps of saturation with seawater and oil, conventional recovery with water and enhanced recovery with the selected microemulsions. The Botucatu sandstone presented better recovery parameters, and the microemulsion composed with BS surfactant had larger recovery efficiency (26.88%) Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Microemulsão; Petróleo; Recuperação avançada; Salinidade; Arenito; Microemulsion; Petroleum; Enhanced recovery; Salinity; Sandstone

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Paulino, L. C. (2007). Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15861

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Paulino, Luísa Cimatti. “Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo .” 2007. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15861.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Paulino, Luísa Cimatti. “Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo .” 2007. Web. 20 Nov 2019.

Vancouver:

Paulino LC. Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2007. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15861.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Paulino LC. Estudo de sistemas microemulsionados utilizando água do mar na recuperação avançada de petróleo . [Thesis]. Universidade do Rio Grande do Norte; 2007. Available from: http://repositorio.ufrn.br/handle/123456789/15861

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

26. Nóbrega, Geraldine Angélica Silva da. Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente .

Degree: 2007, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15875

► During natural gas processing, water removal is considered as a fundamental step in that combination of hydrocarbons and water favors the formation of hydrates. The… (more)

▼ During natural gas processing, water removal is considered as a fundamental step in that combination of hydrocarbons and water favors the formation of hydrates. The gas produced in the Potiguar Basin (Brazil) presents high water content (approximately 15000 ppm) and its dehydration is achieved via absorption and adsorption operations. This process is carried out at the Gas Treatment Unit (GTU) in Guamaré (GMR), in the State of Rio Grande do Norte. However, it is a costly process, which does not provide satisfactory results when water contents as low as 0.5 ppm are required as the exit of the GTU. In view of this, microemulsions research is regarded as an alternative to natural gas dehydration activities. Microemulsions can be used as desiccant fluids because of their unique proprieties, namely solubilization enhancement, reduction in interfacial tensions and large interfacial area between continuous and dispersed phases. These are actually important parameters to ensure the efficiency of an absorption column. In this work, the formulation of the desiccant fluid was determined via phases diagram construction, employing there nonionic surfactants (RDG 60, UNTL L60 and AMD 60) and a nonpolar fluid provided by Petrobras GMR (Brazil) typically comprising low-molecular weight liquid hydrocarbons ( a solvent commonly know as aguarrás ). From the array of phases diagrams built, four representative formulations have been selected for providing better results: 30% RDG 60-70% aguarrás; 15% RDG 60-15% AMD 60-70% aguarrás, 30% UNTL L60-70% aguarrás, 15% UNTL L60-15% AMD 60-70% aguarrás. Since commercial natural gas is already processed, and therefore dehydrated, it was necessary to moister some sample prior to all assays. It was then allowed to cool down to 13ºC and interacted with wet 8-12 mesh 4A molecular sieve, thus enabling the generation of gas samples with water content (approximately 15000 ppm). The determination of the equilibrium curves was performed based on the dynamic method, which stagnated liquid phase and gas phase at a flow rate of 200 mL min-1. The hydrodynamic study was done with the aim of established the pressure drop and dynamic liquid hold-up. This investigation allowed are to set the working flow rates at 840 mL min-1 for the gas phase and 600 mLmin-1 for the liquid phase. The mass transfer study indicated that the system formed by UNTL L60- turpentine-natural gas the highest value of NUT Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Gás Natural; Coluna recheada; Microemulsão; Solubilidade; Hidrodinâmica; Desidratação; Natural gas; Packed column; Microemulsion; Solubility; Hydrodynamic; Dehydration

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nóbrega, G. A. S. d. (2007). Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15875

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nóbrega, Geraldine Angélica Silva da. “Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente .” 2007. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15875.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nóbrega, Geraldine Angélica Silva da. “Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente .” 2007. Web. 20 Nov 2019.

Vancouver:

Nóbrega GASd. Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2007. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15875.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nóbrega GASd. Estudo de uma coluna de absorção recheada para desidratação do gás natural utilizando microemulsão como absorvente . [Thesis]. Universidade do Rio Grande do Norte; 2007. Available from: http://repositorio.ufrn.br/handle/123456789/15875

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

27. Vale, Túlio Ytérbio Fernandes. Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15889

► The high concentration of residual oil is one of the greatest problems found in petroleum mature fields. In these reservoirs, different enhanced oil recovery methods… (more)

▼ The high concentration of residual oil is one of the greatest problems found in petroleum mature fields. In these reservoirs, different enhanced oil recovery methods (EOR) can be used, highlighting the microemulsion injection. The microemulsion has showed to be efficient in petroleum recovery due to its ability to promote an efficient displacement of the petroleum, acting directly in the residual oil. In this way, this research has as objective the study of microemulsion systems obtained using a commercial surfactant (TP), determining microemulsion thermal stabilities and selecting points inside the pseudoternary phases diagram, evaluating its efficiencies and choosing the best system, that has the following composition: TP as surfactant (S), isopropyl alcohol as co-surfactant (C), kerosene as oil phase, water as aqueous phase, C/S ratio = 1, and 5% sodium p-toluenesulfonate as hydrotope; being observed the following parameters for the selection of the best pseudoternary phases diagram: C/S ratio, co-surfactant nature and addition of hydrotope to the system. The efficiency in petroleum recovery was obtained using two sandstone formation systems: Assu and Botucatu. The study of thermal stabilities showed that as the concentration of active matter in the system increased, the thermal stability also increased. The best thermal stability was obtained using point F (79.56 0C). The system that presented the best recovery percentile between the three selected (3) was composed by: 70% C/S, 2% kerosene and 28% water, with 94% of total recovery efficiency and 60% with microemulsion injection, using the Botucatu formation, that in a general way presented greater efficiencies as compared with the Assu one (81.3% of total recovery efficiency and 38.3% with microemulsion injection) Advisors/Committee Members: Dantas, Tereza Neuma de Castro (advisor), CPF:07286937391 (advisor), do%3Fid%3DK4783139Z0%26dataRevisao%3Dnull%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Microemulsão; Recuperação de petróleo; Eficiências; Petróleo; EOR; Microemulsion; Oil recovery; Efficiency; Petroleum; EOR

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vale, T. Y. F. (2009). Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15889

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vale, Túlio Ytérbio Fernandes. “Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo .” 2009. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15889.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vale, Túlio Ytérbio Fernandes. “Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo .” 2009. Web. 20 Nov 2019.

Vancouver:

Vale TYF. Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15889.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vale TYF. Desenvolvimento de tensoativos e sistemas microemulsionados para recuperação de petróleo . [Thesis]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15889

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

28. Lima, Lêda Maria Oliveira de. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15893

► Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a… (more)

▼ Innovative technologies using surfactant materials have applicability in several industrial fields, including petroleum and gas areas. This study seeks to investigate the use of a surfactant derived from coconut oil (SCO saponified coconut oil) in the recovery process of organic compounds that are present in oily effluents from petroleum industry. For this end, experiments were accomplished in a column of small dimension objectifying to verify the influence of the surfactant SCO in the efficiency of oil removal. This way, they were prepared emulsions with amount it fastens of oil (50, 100, 200 and 400 ppm), being determined the great concentrations of surfactant for each one of them. Some rehearsals were still accomplished with produced water of the industry of the petroleum to compare the result with the one of the emulsions. According to the experiments, it was verified that an increase of the surfactant concentration does not implicate in a greater oil removal. The separation process use gaseous bubbles formed when a gas stream pass a liquid column, when low surfactant concentrations are used, it occurs the coalescence of the dispersed oil droplets and their transport to the top of the column, forming a new continuous phase. Such surfactants lead to a gas-liquid interface saturation, depending on the used surfactant concentration, affecting the flotation process and influencing in the removal capacity of the oily dispersed phase. A porous plate filter, with pore size varying from 40 to 250 mm, was placed at the base of the column to allow a hydrodynamic stable operation. During the experimental procedures, the operating volume of phase liquid was held constant and the rate of air flow varied in each experiment. The resulting experimental of the study hydrodynamic demonstrated what the capturing of the oil was influenced by diameter of the bubbles and air flow. With the increase flow of 300 about to 900 cm3.min-1, occurred an increase in the removal of oil phase of 44% about to 66% and the removal kinetic of oil was defined as a reaction of 1° order Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Flotação; Efluentes oleosos; Petróleo; Óleo de coco; Tensoativo; Flotation; Oily effluents; Petroleum; Coconut oil; Surfactant

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lima, L. M. O. d. (2009). Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2009. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lima, Lêda Maria Oliveira de. “Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção .” 2009. Web. 20 Nov 2019.

Vancouver:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lima LMOd. Utilização de uma coluna de flotação para remoção de compostos orgânicos da água de produção . [Thesis]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

29. Gomes, Erika Adriana de Santana. Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água .

Degree: 2009, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15895

► The WAT is the temperature at the beginning of the appearance of wax crystals. At this temperature the first wax crystals are formed by the… (more)

▼ The WAT is the temperature at the beginning of the appearance of wax crystals. At this temperature the first wax crystals are formed by the cooling systems paraffin / solvents. Paraffins are composed of a mixture of saturated hydrocarbons of high molecular weight. The removal of petroleum from wells and the production lines means a surcharge on produced oil, thus solubilize these deposits formed due to modifications of thermodynamics has been a constant challenge for companies of oil exploration. This study combines the paraffin solubilization by microemulsion systems, the determination of WAT systems paraffin / solvent and performance of surfactant in reducing the crystallization. We used the methods: rheological and the photoelectric signal, validating the latter which was developed to optimize the data obtained due to sensitivity of the equipment used. Methods developed for description of wax precipitation are often in poor agreement with the experimental data, they tend to underestimate the amount of wax at temperatures below the turbidity point. The Won method and the Ideal solution method were applied to the WAT data obtained in solvent systems, best represented by the second interaction of Won method using the solvents naphtha, hexane and LCO. It was observed that the results obtained by WAT photoelectric signal when compared with the viscosity occur in advance, demonstrating the greatest sensitivity of the method developed. The ionic surfactant reduced the viscosity of the solvent systems as it acted modifying the crystalline structure and, consequently, the pour point. The curves show that the WAT experimental data is, in general, closer to the modeling performed by the method of Won than to the one performed by the ideal solution method, because this method underestimates the curve predicting the onset of paraffin hydrocarbons crystallization temperature. This occurs because the actual temperature measured was the crystallization temperature and the method proposes the fusion temperature measurement. Advisors/Committee Members: Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor), Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor).

Subjects/Keywords: Parafina; temperatura; cristalização; microemulsões; tensoativo; viscosidade; modelagem; termodinâmica; método; fotoelétrico; solventes; Paraffin; temperature, crystallization, microemulsions, surfactant, viscosity, modeling, thermodynamics, method, photoelectric; solvents

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gomes, E. A. d. S. (2009). Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15895

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gomes, Erika Adriana de Santana. “Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água .” 2009. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15895.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gomes, Erika Adriana de Santana. “Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água .” 2009. Web. 20 Nov 2019.

Vancouver:

Gomes EAdS. Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2009. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15895.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gomes EAdS. Estudo da cristalização de parafinas em sistemas solventes/tensoativos/água . [Thesis]. Universidade do Rio Grande do Norte; 2009. Available from: http://repositorio.ufrn.br/handle/123456789/15895

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

30. Fernandes, Manoel Reginaldo. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .

Degree: 2011, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15909

► The industry, over the years, has been working to improve the efficiency of diesel engines. More recently, it was observed the need to reduce pollutant… (more)

▼ The industry, over the years, has been working to improve the efficiency of diesel engines. More recently, it was observed the need to reduce pollutant emissions to conform to the stringent environmental regulations. This has attached a great interest to develop researches in order to replace the petroleum-based fuels by several types of less polluting fuels, such as blends of diesel oil with vegetable oil esters and diesel fuel with vegetable oils and alcohol, emulsions, and also microemulsions. The main objective of this work was the development of microemulsion systems using nonionic surfactants that belong to the Nonylphenols ethoxylated group and Lauric ethoxylated alcohol group, ethanol/diesel blends, and diesel/biodiesel blends for use in diesel engines. First, in order to select the microemulsion systems, ternary phase diagrams of the used blends were obtained. The systems were composed by: nonionic surfactants, water as polar phase, and diesel fuel or diesel/biodiesel blends as apolar phase. The microemulsion systems and blends, which represent the studied fuels, were characterized by density, viscosity, cetane number and flash point. It was also evaluated the effect of temperature in the stability of microemulsion systems, the performance of the engine, and the emissions of carbon monoxide, nitrogen oxides, unburned hydrocarbons, and smoke for all studied blends. Tests of specific fuel consumption as a function of engine power were accomplished in a cycle diesel engine on a dynamometer bench and the emissions were evaluated using a GreenLine 8000 analyzer. The obtained results showed a slight increase in fuel consumption when microemulsion systems and diesel/biodiesel blends were burned, but it was observed a reduction in the emission of nitrogen oxides, unburned hydrocarbons, smoke index and f sulfur oxides Advisors/Committee Members: Dantas Neto, Afonso Avelino (advisor), CPF:05641284491 (advisor), do%3Fid%3DK4783215D9%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783215D9 (advisor), Barros Neto, Eduardo Lins de (advisor), CPF:59545844434 (advisor), do%3Fid%3DK4798645D3%22%29&pagesize-30">http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3 (advisor).

Subjects/Keywords: Diesel; Biodiesel; Emissões de poluentes; Motor diesel; Combustível alternativo; Diesel microemulsionado; ; Surfactant; Biodiesel; Pollutant emission; Diesel engine; Alternative fuel; Diesel-based microemulsion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fernandes, M. R. (2011). Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15909

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fernandes, Manoel Reginaldo. “Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .” 2011. Thesis, Universidade do Rio Grande do Norte. Accessed November 20, 2019. http://repositorio.ufrn.br/handle/123456789/15909.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fernandes, Manoel Reginaldo. “Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões .” 2011. Web. 20 Nov 2019.

Vancouver:

Fernandes MR. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Nov 20]. Available from: http://repositorio.ufrn.br/handle/123456789/15909.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fernandes MR. Formulação de novos combustíveis base diesel: avaliação de desempenho e emissões . [Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15909

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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