subject:(Gases Separation)

Hong Kong University of Science and Technology

1. Wang, Maojian CBME. Optimization and integration method of integrated gasification combined cycle system based on novel simplified models.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-94624 ; https://doi.org/10.14711/thesis-991012551469003412 ; http://repository.ust.hk/ir/bitstream/1783.1-94624/1/th_redirect.html

► As promising power generation technology, the advantages of Integrated Gasification Combined Cycle (IGCC) system are confirmed. However, high electricity production cost is the bottleneck before… (more)

▼ As promising power generation technology, the advantages of Integrated Gasification Combined Cycle (IGCC) system are confirmed. However, high electricity production cost is the bottleneck before fully commercialization. IGCC complicated process, including gasification, power and Air Separation Unit (ASU) island, provides opportunities to increase its efficiency through process optimization and integration. But there is a requirement of suitable models considering both prediction accuracy and flexibility to overcome existing barrier of large-scale optimization problem. In this thesis, the gap is fulfilled by proposing simplified models for three IGCC islands. Firstly, the novel simplified gasification island model is proposed based on reaction mechanism simplification using Water Gas Shit Reaction. After validation by experiment data, Cold Gas Efficiency optimization of IGCC plant gasifier is achieved with 10 % improvement. Then simplified model of power island is proposed and compared with rigorous commercial simulator. It is the foundation of further Gas Turbine performance optimization and Steam Turbine (ST) simultaneous parameter optimization and heat integration considering boiler feed water preheating. As the extension of simplified ST model, a novel shortcut model is proposed to optimize the regenerative retrofit for steam Rankine cycle. The most profitable regenerative scheme could generate from single to multiple extractions situations. After the validations with non-linear solver, the advantages of simple optimization procedures without building simulation and applying optimization algorithm are demonstrated in industrial case. Besides that, a simplified cryogenic ASU model is proposed and the non-standard operation conditions shows good performance for IGCC plant application. Finally, using all proposed models, the simultaneous parameter optimization and integration of IGCC system is completed in the aspect of economic and thermal performance. The simultaneous methodology is applied for gasification island firstly with 40 % profit and 4 % CGE improvements, and then for power and ASU island together with stepwise power output increment among cases.

Subjects/Keywords: Coal gasification ; Synthesis gas ; Gases ; Separation

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APA (6^th Edition):

Wang, M. C. (2017). Optimization and integration method of integrated gasification combined cycle system based on novel simplified models. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-94624 ; https://doi.org/10.14711/thesis-991012551469003412 ; http://repository.ust.hk/ir/bitstream/1783.1-94624/1/th_redirect.html

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):

Wang, Maojian CBME. “Optimization and integration method of integrated gasification combined cycle system based on novel simplified models.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 16, 2021. http://repository.ust.hk/ir/Record/1783.1-94624 ; https://doi.org/10.14711/thesis-991012551469003412 ; http://repository.ust.hk/ir/bitstream/1783.1-94624/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Wang, Maojian CBME. “Optimization and integration method of integrated gasification combined cycle system based on novel simplified models.” 2017. Web. 16 Jan 2021.

Vancouver:

Wang MC. Optimization and integration method of integrated gasification combined cycle system based on novel simplified models. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Jan 16]. Available from: http://repository.ust.hk/ir/Record/1783.1-94624 ; https://doi.org/10.14711/thesis-991012551469003412 ; http://repository.ust.hk/ir/bitstream/1783.1-94624/1/th_redirect.html.

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

Council of Science Editors:

Wang MC. Optimization and integration method of integrated gasification combined cycle system based on novel simplified models. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-94624 ; https://doi.org/10.14711/thesis-991012551469003412 ; http://repository.ust.hk/ir/bitstream/1783.1-94624/1/th_redirect.html

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

Hong Kong University of Science and Technology

2. Yeoh, Keat Ping CBME. Modelling and optimization of cryogenic air separation unit.

Degree: 2019, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-106037 ; https://doi.org/10.14711/thesis-991012753758803412 ; http://repository.ust.hk/ir/bitstream/1783.1-106037/1/th_redirect.html

► Cryogenic air separation is a process that can be integrated into other processes. Yet, many processes that include a cryogenic air separation unit (ASU), such… (more)

▼ Cryogenic air separation is a process that can be integrated into other processes. Yet, many processes that include a cryogenic air separation unit (ASU), such as gasification, still utilize the standard design typically used to produce relatively pure nitrogen and oxygen products for retail purposes. The energy efficiency of processes with a cryogenic ASU could be improved by using a non-standard design, where nitrogen and oxygen products of lower purity are produced and used in downstream process units. However, it is complex to simultaneously optimize an ASU with other processes. Therefore, a simple model of an ASU that can be integrated with other process units is developed in this work. The most complex units in a cryogenic ASU are the distillation units and the multistream heat exchanger. Distillation models were reviewed followed by the development of a new model. A novel, non-rigorous distillation model is developed without using constant molal overflow assumptions. The novel model was developed with insight from the models reviewed, as well as material and energy balances and could predict the change in liquid and vapour flow throughout a distillation column without rigorous stage-by-stage modelling. It was tested against other models and also compared to a rigorous model obtained from an ASPEN simulation. Results showed that the novel model was accurate and easy to solve. Following that, equation-oriented heat integration models were studied. A comparison between three heat integration models was carried out and the Multi-M model proved to be the best in terms of solution quality, speed and accuracy. Although the model was traditionally applied to heat exchanger networks, a slight modification by setting the hot and cold utilities to zero enabled the use of the model to represent a multistream heat exchanger. After suitable models for distillation and heat integration were identified, case studies were carried out on the optimization of a cryogenic ASU. The results of the case studies were encouraging as comparison with ASPEN simulations consistently showed close agreement. Furthermore, the solutions obtained were in close agreement with literature data.

Subjects/Keywords: Gases ; Separation ; Low temperature engineering ; Distillation, Fractional

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APA (6^th Edition):

Yeoh, K. P. C. (2019). Modelling and optimization of cryogenic air separation unit. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-106037 ; https://doi.org/10.14711/thesis-991012753758803412 ; http://repository.ust.hk/ir/bitstream/1783.1-106037/1/th_redirect.html

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):

Yeoh, Keat Ping CBME. “Modelling and optimization of cryogenic air separation unit.” 2019. Thesis, Hong Kong University of Science and Technology. Accessed January 16, 2021. http://repository.ust.hk/ir/Record/1783.1-106037 ; https://doi.org/10.14711/thesis-991012753758803412 ; http://repository.ust.hk/ir/bitstream/1783.1-106037/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Yeoh, Keat Ping CBME. “Modelling and optimization of cryogenic air separation unit.” 2019. Web. 16 Jan 2021.

Vancouver:

Yeoh KPC. Modelling and optimization of cryogenic air separation unit. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2019. [cited 2021 Jan 16]. Available from: http://repository.ust.hk/ir/Record/1783.1-106037 ; https://doi.org/10.14711/thesis-991012753758803412 ; http://repository.ust.hk/ir/bitstream/1783.1-106037/1/th_redirect.html.

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

Council of Science Editors:

Yeoh KPC. Modelling and optimization of cryogenic air separation unit. [Thesis]. Hong Kong University of Science and Technology; 2019. Available from: http://repository.ust.hk/ir/Record/1783.1-106037 ; https://doi.org/10.14711/thesis-991012753758803412 ; http://repository.ust.hk/ir/bitstream/1783.1-106037/1/th_redirect.html

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

3. Sutthisa Konruang. Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation .

Degree: คณะวิทยาศาสตร์ ภาควิชาฟิสิกส์, 2015, Prince of Songkla University

URL: http://kb.psu.ac.th/psukb/handle/2010/10215

Subjects/Keywords: Gas separation membranes; Gases Separation

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APA (6^th Edition):

Konruang, S. (2015). Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation . (Thesis). Prince of Songkla University. Retrieved from http://kb.psu.ac.th/psukb/handle/2010/10215

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):

Konruang, Sutthisa. “Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation .” 2015. Thesis, Prince of Songkla University. Accessed January 16, 2021. http://kb.psu.ac.th/psukb/handle/2010/10215.

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

MLA Handbook (7^th Edition):

Konruang, Sutthisa. “Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation .” 2015. Web. 16 Jan 2021.

Vancouver:

Konruang S. Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation . [Internet] [Thesis]. Prince of Songkla University; 2015. [cited 2021 Jan 16]. Available from: http://kb.psu.ac.th/psukb/handle/2010/10215.

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

Council of Science Editors:

Konruang S. Preparation of polysulfone and polyethylene membrane and surface modification by plasma and UV radiation for oxygen/nitrogen and carbon dioxide/methane gas separation . [Thesis]. Prince of Songkla University; 2015. Available from: http://kb.psu.ac.th/psukb/handle/2010/10215

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

University of Texas – Austin

4. Prabhakar, Rajeev Satish. Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas.

Degree: PhD, Chemical Engineering, 2004, University of Texas – Austin

URL: http://hdl.handle.net/2152/1646

Subjects/Keywords: Gas separation membranes; Gases – Separation; Polymers

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APA (6^th Edition):

Prabhakar, R. S. (2004). Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1646

Chicago Manual of Style (16^th Edition):

Prabhakar, Rajeev Satish. “Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas.” 2004. Doctoral Dissertation, University of Texas – Austin. Accessed January 16, 2021. http://hdl.handle.net/2152/1646.

MLA Handbook (7^th Edition):

Prabhakar, Rajeev Satish. “Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas.” 2004. Web. 16 Jan 2021.

Vancouver:

Prabhakar RS. Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2004. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2152/1646.

Council of Science Editors:

Prabhakar RS. Low hydrocarbon solubility polymers: plasticization-resistant membranes for carbon dioxide removal from natural gas. [Doctoral Dissertation]. University of Texas – Austin; 2004. Available from: http://hdl.handle.net/2152/1646

University of the Western Cape

5. Meyer, Faiek. Hydrogen selective properties of cesium-hydrogensulphate membranes .

Degree: 2006, University of the Western Cape

URL: http://hdl.handle.net/11394/2224

► Over the past 40 years, research pertaining to membrane technology has lead to the development of a wide range of applications including beverage production, water… (more)

Subjects/Keywords: Gases; Separation; Membrane separation; Separation (Technology); Membrane (Technology)

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APA (6^th Edition):

Meyer, F. (2006). Hydrogen selective properties of cesium-hydrogensulphate membranes . (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/2224

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):

Meyer, Faiek. “Hydrogen selective properties of cesium-hydrogensulphate membranes .” 2006. Thesis, University of the Western Cape. Accessed January 16, 2021. http://hdl.handle.net/11394/2224.

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

MLA Handbook (7^th Edition):

Meyer, Faiek. “Hydrogen selective properties of cesium-hydrogensulphate membranes .” 2006. Web. 16 Jan 2021.

Vancouver:

Meyer F. Hydrogen selective properties of cesium-hydrogensulphate membranes . [Internet] [Thesis]. University of the Western Cape; 2006. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/11394/2224.

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

Council of Science Editors:

Meyer F. Hydrogen selective properties of cesium-hydrogensulphate membranes . [Thesis]. University of the Western Cape; 2006. Available from: http://hdl.handle.net/11394/2224

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

Ryerson University

6. Hashemi, Nasim. Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD.

Degree: 2017, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A7136

► This doctoral thesis addresses the mixing of highly viscous Newtonian fluids (corn syrup solutions) in a novel aerated reactor equipped with a central impeller (a… (more)

▼ This doctoral thesis addresses the mixing of highly viscous Newtonian fluids (corn syrup solutions) in a novel aerated reactor equipped with a central impeller (a pitched blade turbine in upward or downward pumping mode) and a wall scraping anchor. The non-intrusive electrical resistance tomography (ERT), dynamic gas disengagement method (DGD), design of experiments (DOE), computational fluid dynamics (CFD), and population balance model (PBM) were employed to characterize the performance of this novel aerated system. The performance criteria to be examined were mixing time, power uptake, gas holdup, and bubble size distribution. In this study, novel correlations were developed to estimate the gassed power drawn by the coaxial mixer, mixing time, and gas holdup. In addition, to obtain a master power curve, two new dimensionless correlations were proposed for the generalized power number and gas flow number by incorporating the equivalent rotational speed for the coaxial mixer, speed ratio (central impeller speed/anchor speed), and the central impeller power fraction into these two correlations. The experimental data demonstrated that gas flow affected the aerated anchor power consumption and central impeller power consumption in different manners. It was also found that at the higher fluid viscosity and beyond the critical speed ratio of 10, the anchor power consumption was increased by increasing the speed ratio (i.e. decreasing the anchor speed). It was shown that in the presence of gas, the anchor impeller in combination with the upward pumping pitched blade turbine in the co-rotating mode exhibited shorter mixing times and lower power consumption than the anchor-downward pumping pitched blade coaxial mixer. To enhance the efficiency of the aerated mixer, it is critical to investigate the influence of the gas-liquid flow within the vessel on the bubble size distribution (BSD) and the local and global gas holdup. To achieve this goal, the effects of the bubble breakup and coalescence on the BSD within the vessel were incorporated into the CFD model through the CFD-PBM coupling. The experimental and simulation results showed that beyond the critical speed ratio of 10, the volume fractions of the large bubbles decreased while the volume fractions of the small bubbles increased.

Subjects/Keywords: Two phase flow – Measurement; Gases – Separation; Surfaces (Physics); Multiphase flow

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APA (6^th Edition):

Hashemi, N. (2017). Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A7136

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):

Hashemi, Nasim. “Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD.” 2017. Thesis, Ryerson University. Accessed January 16, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A7136.

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

MLA Handbook (7^th Edition):

Hashemi, Nasim. “Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD.” 2017. Web. 16 Jan 2021.

Vancouver:

Hashemi N. Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD. [Internet] [Thesis]. Ryerson University; 2017. [cited 2021 Jan 16]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A7136.

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

Council of Science Editors:

Hashemi N. Analysis of Gas-Liquid Flow in an Aerated Reactor Equipped with a Coaxial Mixer through Tomography and CFD. [Thesis]. Ryerson University; 2017. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A7136

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

Hong Kong University of Science and Technology

7. Ng, Tsz Nok. Flow synthesis and positioning of porous materials in microreactors.

Degree: 2015, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-74354 ; https://doi.org/10.14711/thesis-b1451946 ; http://repository.ust.hk/ir/bitstream/1783.1-74354/1/th_redirect.html

► Porous material has been playing an important role in global issues such as environmental pollution, energy crisis and global warming. Mesoporous silica has been applied… (more)

Subjects/Keywords: Microreactors ; Microchemistry ; Porous materials ; Organometallic polymers ; Catalysis ; Gases ; Separation

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APA (6^th Edition):

Ng, T. N. (2015). Flow synthesis and positioning of porous materials in microreactors. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-74354 ; https://doi.org/10.14711/thesis-b1451946 ; http://repository.ust.hk/ir/bitstream/1783.1-74354/1/th_redirect.html

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):

Ng, Tsz Nok. “Flow synthesis and positioning of porous materials in microreactors.” 2015. Thesis, Hong Kong University of Science and Technology. Accessed January 16, 2021. http://repository.ust.hk/ir/Record/1783.1-74354 ; https://doi.org/10.14711/thesis-b1451946 ; http://repository.ust.hk/ir/bitstream/1783.1-74354/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Ng, Tsz Nok. “Flow synthesis and positioning of porous materials in microreactors.” 2015. Web. 16 Jan 2021.

Vancouver:

Ng TN. Flow synthesis and positioning of porous materials in microreactors. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2015. [cited 2021 Jan 16]. Available from: http://repository.ust.hk/ir/Record/1783.1-74354 ; https://doi.org/10.14711/thesis-b1451946 ; http://repository.ust.hk/ir/bitstream/1783.1-74354/1/th_redirect.html.

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

Council of Science Editors:

Ng TN. Flow synthesis and positioning of porous materials in microreactors. [Thesis]. Hong Kong University of Science and Technology; 2015. Available from: http://repository.ust.hk/ir/Record/1783.1-74354 ; https://doi.org/10.14711/thesis-b1451946 ; http://repository.ust.hk/ir/bitstream/1783.1-74354/1/th_redirect.html

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

Montana State University

8. Spracklen, Neil Matthew. Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube.

Degree: MS, College of Engineering, 1998, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/7713

Subjects/Keywords: Gases.; Separation (Technology).; Vortex tubes.

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APA (6^th Edition):

Spracklen, N. M. (1998). Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/7713

Chicago Manual of Style (16^th Edition):

Spracklen, Neil Matthew. “Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube.” 1998. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/7713.

MLA Handbook (7^th Edition):

Spracklen, Neil Matthew. “Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube.” 1998. Web. 16 Jan 2021.

Vancouver:

Spracklen NM. Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube. [Internet] [Masters thesis]. Montana State University; 1998. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7713.

Council of Science Editors:

Spracklen NM. Preliminary investigation of the separation of a binary, two-phase hydrocarbon mixture using a commercially available vortex tube. [Masters Thesis]. Montana State University; 1998. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7713

Montana State University

9. Binau, Nathan Jeremiah. Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight.

Degree: MS, College of Engineering, 1997, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/7750

Subjects/Keywords: Separation (Technology).; Gases.; Oxygen.

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APA (6^th Edition):

Binau, N. J. (1997). Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/7750

Chicago Manual of Style (16^th Edition):

Binau, Nathan Jeremiah. “Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight.” 1997. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/7750.

MLA Handbook (7^th Edition):

Binau, Nathan Jeremiah. “Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight.” 1997. Web. 16 Jan 2021.

Vancouver:

Binau NJ. Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight. [Internet] [Masters thesis]. Montana State University; 1997. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7750.

Council of Science Editors:

Binau NJ. Assessment of air separation technologies for the recovery of oxygen for use in hypersonic flight. [Masters Thesis]. Montana State University; 1997. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7750

University of Missouri – Columbia

10. Hendry, Doug. Investigation of supercritical fluids for use in biomass processing & carbon recycling.

Degree: 2012, University of Missouri – Columbia

URL: http://hdl.handle.net/10355/14997

► An apparatus was built in the Mizzou Carbon Recycling Center to explore the continuous thermochemical conversion of biomass and model compounds in supercritical water. The… (more)

▼ An apparatus was built in the Mizzou Carbon Recycling Center to explore the continuous thermochemical conversion of biomass and model compounds in supercritical water. The apparatus was used to investigate gasification or biomass and other organics in supercritical water to produce fuel gases. It proved to be superior to other designs in that the apparatus was capable of achieving both high gasification efficiencies and high gasification rates. The apparatus is also amenable other thermochemical conversion processes including SCW oxidation (combustion), hydrolysis in super and subcritical water, or combinations thereof. The continuous supercritical water gasification apparatus is used to investigate glucose gasification in supercritical water at high temperatures and low residence times. A 23 full factorial experiment was performed to determine the effects of feed concentration, temperature, and residence time on glucose gasification. Glucose is a good representative of cellulosic biomass. Additionally, supercritical water gasification of ethanol and butanol as biomass model compounds was explored over a range of residence times from 0.7 to 34 s. Residence time was decreased until turbulence was achieved (τ ≤ 1.2 s). As fluid transitioned from laminar to turbulent flow, gasification rate was maximized while gasification efficiency was reduced. Gasification rates up to 107 g/L-s were observed; this is nearly an order of magnitude higher than previously reported. Arrhenius parameters were estimated to model the intrinsic kinetics of gasification of model compounds in supercritical water operating in plug flow without any transport limitations in the radial direction; this technique has never before been applied to supercritical water gasification. Separations relevant to operation the continuous supercritical water gasification apparatus, and thus a biorefinery, are explored with the motivation to increase purity and energy density of gasification products. The separation of a supercritical mixture of nitrogen and carbon dioxide is investigated at pressures from 10 to 31 MPa and temperatures of -5° and 23°C. Nitrogen is used as a model compound for valuable fuel gases (H2, CH4) produced during SCWG. Nitrogen mole fraction increases in the positive vertical direction near the top of the pressure vessel leading to an effective separation. The separation effectiveness is increased with increased pressure and decreased temperature. Preliminary experiments were also performed with additional binary systems: CO2/H2, CO2/CH4, and CO2/Air, all of which behave similarly to the CO2/N2 system. This kind of high pressure separation has applications in continuous processing of pressurized gasification products, other biomass refinery operations, and in the natural gas industry. Solid feeding is an important issue during biorefinery operation. One of the largest delays with the implementation of SCWG technology on a large scale is the lack a reliable feeding mechanism for a variety of biomass and waste feeds. A novel feeder was… Advisors/Committee Members: Jacoby, William A. (advisor).

Subjects/Keywords: supercritical fluids; carbon capture; gasification; fuel gases; separation effectiveness

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APA (6^th Edition):

Hendry, D. (2012). Investigation of supercritical fluids for use in biomass processing & carbon recycling. (Thesis). University of Missouri – Columbia. Retrieved from http://hdl.handle.net/10355/14997

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):

Hendry, Doug. “Investigation of supercritical fluids for use in biomass processing & carbon recycling.” 2012. Thesis, University of Missouri – Columbia. Accessed January 16, 2021. http://hdl.handle.net/10355/14997.

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

MLA Handbook (7^th Edition):

Hendry, Doug. “Investigation of supercritical fluids for use in biomass processing & carbon recycling.” 2012. Web. 16 Jan 2021.

Vancouver:

Hendry D. Investigation of supercritical fluids for use in biomass processing & carbon recycling. [Internet] [Thesis]. University of Missouri – Columbia; 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10355/14997.

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

Council of Science Editors:

Hendry D. Investigation of supercritical fluids for use in biomass processing & carbon recycling. [Thesis]. University of Missouri – Columbia; 2012. Available from: http://hdl.handle.net/10355/14997

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

University of Missouri – Columbia

11. Espanani, Reza. Investigation of supercritical water processing of biomass : study of high pressure separation.

Degree: 2016, University of Missouri – Columbia

URL: https://doi.org/10.32469/10355/56521

► Global warming is caused by greenhouse gases such as CO2, CH4, NOx, and SOx. CO2 makes up about 80% (by mass) of greenhouse gas emitted… (more)

Subjects/Keywords: Vapor-liquid equilibrium – Mathematical models; Gases – Separation; Nitrogen; Carbon dioxide

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APA (6^th Edition):

Espanani, R. (2016). Investigation of supercritical water processing of biomass : study of high pressure separation. (Thesis). University of Missouri – Columbia. Retrieved from https://doi.org/10.32469/10355/56521

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):

Espanani, Reza. “Investigation of supercritical water processing of biomass : study of high pressure separation.” 2016. Thesis, University of Missouri – Columbia. Accessed January 16, 2021. https://doi.org/10.32469/10355/56521.

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

MLA Handbook (7^th Edition):

Espanani, Reza. “Investigation of supercritical water processing of biomass : study of high pressure separation.” 2016. Web. 16 Jan 2021.

Vancouver:

Espanani R. Investigation of supercritical water processing of biomass : study of high pressure separation. [Internet] [Thesis]. University of Missouri – Columbia; 2016. [cited 2021 Jan 16]. Available from: https://doi.org/10.32469/10355/56521.

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

Council of Science Editors:

Espanani R. Investigation of supercritical water processing of biomass : study of high pressure separation. [Thesis]. University of Missouri – Columbia; 2016. Available from: https://doi.org/10.32469/10355/56521

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

Universidade do Rio Grande do Sul

12. Lopez, Diego Ruben Schmeda. Separação de CO2 em gases de combustão : aplicação de membranas e criogenia.

Degree: 2010, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/24150

►

Este trabalho tem por objetivo avaliar a viabilidade técnica de processos de separação de gás carbônico em correntes de gases de combustão. Neste sentido, a… (more)

▼

Este trabalho tem por objetivo avaliar a viabilidade técnica de processos de separação de gás carbônico em correntes de gases de combustão. Neste sentido, a separação por meio de membranas e por criogenia são avaliadas por meio de simulação de sistemas. As propostas envolvendo membranas avaliam arranjos de membranas em série, os quais são otimizados para condições de maior fluxo permeado e maior beneficio econômico. A corrente de alimentação é de 5 kmol/s e as respectivas frações molares de CO2 e N2 que compõem esta corrente são 0,15 e 0,85. Os resultados obtidos da otimização, para um arranjo de três membranas em série de polyimida de 9000 m² de área superficial, foram uma corrente de permeado de 443,1 mol/s de CO2 a 41,6%, correspondendo a aproximadamente 59% do CO2 da corrente de alimentação. Já com um arranjo de 6 membranas de 9000 m², onde a função objetivo é o maior lucro, foi selecionado o material kapton e a quantidade de CO2 separada é 161,12 mol/s, cuja concentração na mistura é de 79%, e a função objetivo tem um valor de 24.405,30 €/ano. Na outra parte do trabalho, propõe-se e avalia-se um ciclo para o aproveitamento da disponibilidade térmica na regasificação do gás natural líquido, para liquefação de CO2. Obtém-se como resultando em CO2 líquido com fração molar igual a 94%. Este processo consta de uma corrente proveniente da combustão completa de 1 mol/s de metano, contendo 1 mol/s de CO2 e 7,52 mol/s de N2. Esta corrente é comprimida e resfriada até atingir a pressão de 4000 kPa e 25 °C, posteriormente uma membrana enriquece a corrente de gases de combustão, que novamente é comprimida e resfriada até se obter a condensação e separação do CO2. Realiza-se o cálculo de equilíbrio líquido-vapor da mistura utilizando as equações de Peng-Robinson e a regra de mistura de Van der Waals no software VRTherm. A vazão molar do CO2 líquido obtida é de 0,3207 mol/s na concentração declarada. A intensidade energética do processo é de 1,135 kWh/kg de CO2 liquefeito.

The objective of this work is to evaluate the technical feasibility of carbon dioxide separation processes of flue gases streams. In this way, separation processes due membrane and cryogenics are evaluated by system simulation. The systems using membranes evaluates setup of those membranes in series, these setups are optimized for the largest permeate molar flow and the largest economic profit. The feed stream is a 5 kmol/s CO2 – N2 mixture, with molar fraction of 0.15 and 0.85 respectively. The result obtained from the optimization for a setup of three polyimide membranes of 9000 m² is a permeate stream of 443.1 mol/s with CO2 at 41.6%, corresponding to aproximadely 59% of the CO2 contained in the feed stream. When a setup of six 9000 m² membranes is analyzed using an objective function that results in the largest profit, kapton was selected as the material for the membranes. The quantity of CO2 captured is 161.12 mol/s, at 79% of concentration in the mixture, and the objective function has a value of 24,405.30 €/year. The second part of this work,…

Advisors/Committee Members: Schneider, Paulo Smith.

Subjects/Keywords: Separação por membranas; CO2 capture; Membranes; Criogenia; Greenhouse gases; Combustão; Gas separation; Gás; Mixture of gases; Cryogenics; Liquid natural gas

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APA (6^th Edition):

Lopez, D. R. S. (2010). Separação de CO2 em gases de combustão : aplicação de membranas e criogenia. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/24150

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):

Lopez, Diego Ruben Schmeda. “Separação de CO2 em gases de combustão : aplicação de membranas e criogenia.” 2010. Thesis, Universidade do Rio Grande do Sul. Accessed January 16, 2021. http://hdl.handle.net/10183/24150.

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

MLA Handbook (7^th Edition):

Lopez, Diego Ruben Schmeda. “Separação de CO2 em gases de combustão : aplicação de membranas e criogenia.” 2010. Web. 16 Jan 2021.

Vancouver:

Lopez DRS. Separação de CO2 em gases de combustão : aplicação de membranas e criogenia. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2010. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/10183/24150.

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

Council of Science Editors:

Lopez DRS. Separação de CO2 em gases de combustão : aplicação de membranas e criogenia. [Thesis]. Universidade do Rio Grande do Sul; 2010. Available from: http://hdl.handle.net/10183/24150

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

New Jersey Institute of Technology

13. Bhaumik, Syamalendu. Pressure swing absorption-based separation of a gas mixture.

Degree: MSin Chemical Engineering - (M.S.), Chemical Engineering, Chemistry and Environmental Science, 1993, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/theses/1726

► In this study, separation of a gas mixture was investigated using the novel concept of pressure swing absorption in a stationary absorbent liquid. The… (more)

Subjects/Keywords: Gases – Absorption and adsorption; Gases – Separation; Chemical Engineering

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APA (6^th Edition):

Bhaumik, S. (1993). Pressure swing absorption-based separation of a gas mixture. (Thesis). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/theses/1726

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):

Bhaumik, Syamalendu. “Pressure swing absorption-based separation of a gas mixture.” 1993. Thesis, New Jersey Institute of Technology. Accessed January 16, 2021. https://digitalcommons.njit.edu/theses/1726.

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

MLA Handbook (7^th Edition):

Bhaumik, Syamalendu. “Pressure swing absorption-based separation of a gas mixture.” 1993. Web. 16 Jan 2021.

Vancouver:

Bhaumik S. Pressure swing absorption-based separation of a gas mixture. [Internet] [Thesis]. New Jersey Institute of Technology; 1993. [cited 2021 Jan 16]. Available from: https://digitalcommons.njit.edu/theses/1726.

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

Council of Science Editors:

Bhaumik S. Pressure swing absorption-based separation of a gas mixture. [Thesis]. New Jersey Institute of Technology; 1993. Available from: https://digitalcommons.njit.edu/theses/1726

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

14. Wu, Haohan, 1984-. Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs).

Degree: Chemistry and Chemical Biology, 2013, Rutgers University

URL: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069006

Subjects/Keywords: Gases – Absorption and adsorption; Gases – Separation

…on small gases adsorption and separation work, hydrocarbon adsorption and separation became… …4 Table 2. Single-component separation ratios of CO2/N2 at 25 °C. Reproduced with… …9 Table 3. Single-component gas uptake in 1′ and separation ratios of CO2/Gas at 25 °C… …10 Table 4. Single-component gas uptake in 2’ and separation ratios at 25 °C. Reproduced… …26 Figure 27. Comparison of CO2 (black) and selected gases (CH4, red; CO…

10 more images…

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APA (6^th Edition):

Wu, Haohan, 1. (2013). Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs). (Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069006

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):

Wu, Haohan, 1984-. “Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs).” 2013. Thesis, Rutgers University. Accessed January 16, 2021. http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069006.

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

MLA Handbook (7^th Edition):

Wu, Haohan, 1984-. “Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs).” 2013. Web. 16 Jan 2021.

Vancouver:

Wu, Haohan 1. Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs). [Internet] [Thesis]. Rutgers University; 2013. [cited 2021 Jan 16]. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069006.

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

Council of Science Editors:

Wu, Haohan 1. Small gases and hydrocarbon adsorption and separation in microporous metal organic frameworks (MMOFs). [Thesis]. Rutgers University; 2013. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000069006

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

University of New South Wales

15. Crimmins, T. S. The use of ceramic membranes for gas filtration.

Degree: Chemical Engineering & Industrial Chemistry, Faculty of Applied Science, 1990, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57756 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44845/SOURCE02?view=true

Subjects/Keywords: Membrane separation; Gases; Separation; Thesis Digitisation Program

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APA (6^th Edition):

Crimmins, T. S. (1990). The use of ceramic membranes for gas filtration. (Masters Thesis). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57756 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44845/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Crimmins, T S. “The use of ceramic membranes for gas filtration.” 1990. Masters Thesis, University of New South Wales. Accessed January 16, 2021. http://handle.unsw.edu.au/1959.4/57756 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44845/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Crimmins, T S. “The use of ceramic membranes for gas filtration.” 1990. Web. 16 Jan 2021.

Vancouver:

Crimmins TS. The use of ceramic membranes for gas filtration. [Internet] [Masters thesis]. University of New South Wales; 1990. [cited 2021 Jan 16]. Available from: http://handle.unsw.edu.au/1959.4/57756 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44845/SOURCE02?view=true.

Council of Science Editors:

Crimmins TS. The use of ceramic membranes for gas filtration. [Masters Thesis]. University of New South Wales; 1990. Available from: http://handle.unsw.edu.au/1959.4/57756 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44845/SOURCE02?view=true

University of Texas – Austin

16. Lin, Haiqing. Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases.

Degree: PhD, Chemical Engineering, 2005, University of Texas – Austin

URL: http://hdl.handle.net/2152/2266

► Membrane technology has attracted interest for the selective removal of carbon dioxide from mixtures with light gases such as H2, CH4 and N2. While conventional… (more)

▼ Membrane technology has attracted interest for the selective removal of carbon dioxide from mixtures with light gases such as H2, CH4 and N2. While conventional structure-property correlations have focused mainly on improving the separation performance by increasing polymer size sieving ability (i.e., diffusivity selectivity), this project explores the possibility of harnessing favorable interactions between CO2 and polymers containing polar groups to improve permeability/selectivity properties. Ether oxide groups are discovered to be among the best moieties known to interact with CO2, leading to high CO2 solubility and CO2/light gas solubility selectivity, while still providing polymer chain flexibility, leading to high CO2 diffusivity and favorable CO2/H2 diffusivity selectivity. Poly(ethylene oxide) (PEO) has a high concentration of ether oxygen groups and exhibits high CO2/light gas selectivities. However, gas permeability is low due to the high crystallinity in PEO. Crosslinking and introduction of short chain branching are efficient methods to inhibit crystallization. Three series of crosslinked poly(ethylene oxide) rubbers have been prepared using prepolymer solutions containing: (1) poly(ethylene glycol) diacrylate (PEGDA) and H2O, (2) PEGDA and poly(ethylene glycol) methyl ether acrylate (PEGMEA), and (3) PEGDA and poly(ethylene glycol) acrylate (PEGA). Independent of the prepolymer composition, all of these polymers have similar ethylene oxide (EO) content (approximately 82 wt.%). Crosslink density decreases with decreasing PEGDA content in the prepolymer solution, which is estimated from water swelling experiments and/or dynamic mechanical testing and has essentially no effect on gas transport properties. Increasing PEGMEA content increases the average size of free volume elements, resulting in a decreased glass transition temperature, and increased CO2 permeability and CO2/H2 selectivity. In contrast, the presence of PEGA or water has a negligible impact on these properties. Due to the affinity between EO and CO2, decreasing temperature increases CO2/light gas solubility selectivity. PEGDA/PEGMEA-30 (a copolymer containing 30 wt.% PEGDA and the balance PEGMEA) demonstrates very favorable mixed gas CO2/H2 and CO2/CH4 separation performance. The separation properties improve with decreasing temperature and have excellent resistance to impurities in the feed streams such as high pressure CO2, higher hydrocarbons and water. Interestingly, the highly sorbing impurities can even improve CO2/H2 separation. Pure and mixed gas diffusivity and permeability in these crosslinked PEO rubbers were successfully modeled using a new free volume model, which was based on the Cohen-Turnbull and Fujita free volume models coupled with Chow’s model for estimating glass transition temperatures in polymer/gas mixtures as a function of temperature and penetrant concentration. Advisors/Committee Members: Freeman, B. D. (Benny D.) (advisor).

Subjects/Keywords: Gas separation membranes; Gases – Separation; Carbon dioxide

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

APA (6^th Edition):

Lin, H. (2005). Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/2266

Chicago Manual of Style (16^th Edition):

Lin, Haiqing. “Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases.” 2005. Doctoral Dissertation, University of Texas – Austin. Accessed January 16, 2021. http://hdl.handle.net/2152/2266.

MLA Handbook (7^th Edition):

Lin, Haiqing. “Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases.” 2005. Web. 16 Jan 2021.

Vancouver:

Lin H. Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2005. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2152/2266.

Council of Science Editors:

Lin H. Solubility selective membrane materials for carbon dioxide removal from mixtures with light gases. [Doctoral Dissertation]. University of Texas – Austin; 2005. Available from: http://hdl.handle.net/2152/2266

University of Texas – Austin

17. Al-Juaied, Mohammed Awad. Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine.

Degree: PhD, Chemical Engineering, 2004, University of Texas – Austin

URL: http://hdl.handle.net/2152/1865

► Intrinsically defect-free asymmetric hollow fiber polyimide membrane modules were studied in the presence and absence of saturated and aromatic components. Results suggest that an essentially… (more)

▼ Intrinsically defect-free asymmetric hollow fiber polyimide membrane modules were studied in the presence and absence of saturated and aromatic components. Results suggest that an essentially defect-free, non-nodular morphology offers advantages in stability under demanding operating conditions. Earlier work showed serious losses in performance of membranes comprised of similar materials, when the selective layer had a pronounced fused nodular nature as opposed to the intrinsically defect-free skin layers reported on here. Under some conditions for the ternary system, the permselectivity of the membrane is scarcely affected, while under other conditions, permselectivity is negatively affected by as much as 25%. In most cases, for the ternary feeds, significant depression in fluxes was observed due to competition between the CO2, CH4 and heavier hydrocarbons but the effect was even more pronounced for the toluene. In addition to steady state tests in the presence and absence of n-heptane and toluene, modules were conditioned for five days with ternary mixture of CO2, CH4 and one or the other of these heavy hydrocarbons. Following this conditioning process, the modules were studied with a simple binary 10% CO2 /90 % CH4 mixture. These conditioning studies provide insight into the fundamental effects induced in the membrane due to the long term exposure to the complex mixtures. Following exposure to the ternaries containing n-heptane, negligible CO2 permeance increase was seen, while significantly increased permeances were seen under some conditions following toluene exposure even at low pressures of the ternary toluene/CO2/CH4 vii conditioning gas mixture. Although a more protracted process occurs in the case of heptane/CO2/CH4 at 35 0C and 500 ppm, a serious loss in selectivity occurs in the actual ternary tests after exposure for five days. The problem caused by 300 ppm toluene at 35 0C is more immediately apparent, but the ultimate selectivity loss is similar. In addition to the selectivity, in the presence of toluene the permeability is also depressed significantly, presumably due to a greater capability to toluene to compete for added free volume elements introduced in the conditioning process. The permeation enhancement due to toluene exposure is lost slowly when the module downstream is put under vacuum and the gas no longer in contact with the module for up to three weeks. The conditioning treatment has negligible effect at 55 0C, suggesting that that the sorption affinity of toluene decreases with increasing temperature. It is seen from the sorption experiments that penetrant induced conditioning of toluene allows a significant increase in diffusivity than in solubility coefficients, thus allowing for higher permeability and lower selectivity. Solubility, rate of absorption and NMR data were obtained for carbon dioxide in aqueous morpholine (MOR), diglycolamine® (DGA) and aqueous mixtures of MOR and DGA®. Solubility and rate data were acquired in a wetted wall contactor.… Advisors/Committee Members: Rochelle, Gary T. (advisor), Koros, William J. (advisor).

Subjects/Keywords: Gases – Separation; Gas separation membranes; Gases – Absorption and adsorption; Carbon dioxide

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APA (6^th Edition):

Al-Juaied, M. A. (2004). Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/1865

Chicago Manual of Style (16^th Edition):

Al-Juaied, Mohammed Awad. “Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine.” 2004. Doctoral Dissertation, University of Texas – Austin. Accessed January 16, 2021. http://hdl.handle.net/2152/1865.

MLA Handbook (7^th Edition):

Al-Juaied, Mohammed Awad. “Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine.” 2004. Web. 16 Jan 2021.

Vancouver:

Al-Juaied MA. Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2004. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2152/1865.

Council of Science Editors:

Al-Juaied MA. Carbon dioxide removal from natural gas by membranes in the presence of heavy hydrocarbons and by aqueous diglycolamine®/morpholine. [Doctoral Dissertation]. University of Texas – Austin; 2004. Available from: http://hdl.handle.net/2152/1865

Montana State University

18. Paulson, Gerald Thomas. Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes.

Degree: MS, College of Engineering, 1982, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/3665

Subjects/Keywords: Membranes (Technology).; Gases.; Separation (Technology).; Permeability.

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APA (6^th Edition):

Paulson, G. T. (1982). Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/3665

Chicago Manual of Style (16^th Edition):

Paulson, Gerald Thomas. “Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes.” 1982. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/3665.

MLA Handbook (7^th Edition):

Paulson, Gerald Thomas. “Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes.” 1982. Web. 16 Jan 2021.

Vancouver:

Paulson GT. Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes. [Internet] [Masters thesis]. Montana State University; 1982. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/3665.

Council of Science Editors:

Paulson GT. Effects of water vapor on the separation of methane and carbon dioxide by gas permeation through polymeric membranes. [Masters Thesis]. Montana State University; 1982. Available from: https://scholarworks.montana.edu/xmlui/handle/1/3665

Montana State University

19. Zavaleta, Ronanth. Selective permeation through modified vinylindene fluoride membranes.

Degree: PhD, College of Engineering, 1975, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/4689

Subjects/Keywords: Permeability.; Gases.; Separation (Technology).; Membranes (Technology).

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APA (6^th Edition):

Zavaleta, R. (1975). Selective permeation through modified vinylindene fluoride membranes. (Doctoral Dissertation). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/4689

Chicago Manual of Style (16^th Edition):

Zavaleta, Ronanth. “Selective permeation through modified vinylindene fluoride membranes.” 1975. Doctoral Dissertation, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/4689.

MLA Handbook (7^th Edition):

Zavaleta, Ronanth. “Selective permeation through modified vinylindene fluoride membranes.” 1975. Web. 16 Jan 2021.

Vancouver:

Zavaleta R. Selective permeation through modified vinylindene fluoride membranes. [Internet] [Doctoral dissertation]. Montana State University; 1975. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/4689.

Council of Science Editors:

Zavaleta R. Selective permeation through modified vinylindene fluoride membranes. [Doctoral Dissertation]. Montana State University; 1975. Available from: https://scholarworks.montana.edu/xmlui/handle/1/4689

Montana State University

20. Seibel, Dennis Robert. The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes.

Degree: MS, College of Engineering, 1973, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/6069

Subjects/Keywords: Gases.; Separation (Technology).; Membranes (Technology).; Permeability.

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APA (6^th Edition):

Seibel, D. R. (1973). The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/6069

Chicago Manual of Style (16^th Edition):

Seibel, Dennis Robert. “The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes.” 1973. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/6069.

MLA Handbook (7^th Edition):

Seibel, Dennis Robert. “The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes.” 1973. Web. 16 Jan 2021.

Vancouver:

Seibel DR. The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes. [Internet] [Masters thesis]. Montana State University; 1973. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6069.

Council of Science Editors:

Seibel DR. The separation of SOâ‚‚and Nâ‚‚ by permeation through modified vinylidene fluoride membranes. [Masters Thesis]. Montana State University; 1973. Available from: https://scholarworks.montana.edu/xmlui/handle/1/6069

Montana State University

21. Mus, Mark David. The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes.

Degree: MS, College of Engineering, 1985, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/5787

Subjects/Keywords: Membranes (Technology).; Gases.; Separation (Technology).; Oxygen.

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APA (6^th Edition):

Mus, M. D. (1985). The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes. (Masters Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/5787

Chicago Manual of Style (16^th Edition):

Mus, Mark David. “The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes.” 1985. Masters Thesis, Montana State University. Accessed January 16, 2021. https://scholarworks.montana.edu/xmlui/handle/1/5787.

MLA Handbook (7^th Edition):

Mus, Mark David. “The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes.” 1985. Web. 16 Jan 2021.

Vancouver:

Mus MD. The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes. [Internet] [Masters thesis]. Montana State University; 1985. [cited 2021 Jan 16]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/5787.

Council of Science Editors:

Mus MD. The separation of oxygen from air using commercial, plasticized, and nonplasticized polymeric membranes. [Masters Thesis]. Montana State University; 1985. Available from: https://scholarworks.montana.edu/xmlui/handle/1/5787

University of Texas – Austin

22. Raharjo, Roy Damar, 1981-. Mixed gas sorption and transport study in solubility selective polymers.

Degree: PhD, Chemical Engineering, 2007, University of Texas – Austin

URL: http://hdl.handle.net/2152/3651

► Membrane separation technology has recently emerged as a potential alternative technique for removing higher hydrocarbons (C₃₊) from natural gas. For economic reasons, membranes for this… (more)

▼ Membrane separation technology has recently emerged as a potential alternative technique for removing higher hydrocarbons (C₃₊) from natural gas. For economic reasons, membranes for this application should be organic vapor selective materials such as poly(dimethylsiloxane) (PDMS) or poly(1-trimethylsilyl-1-propyne) (PTMSP). These polymers, often called solubility selective polymers, sieve penetrant molecules based largely on relative penetrant solubility in the polymer. The sorption and transport properties in such polymers have been reported previously. However, most studies present only pure gas sorption and transport properties. Mixture properties, which are important for estimating membrane separation performance, are less often reported. In addition, mixed gas sorption and diffusion data in such polymers, to the best of our knowledge, have never been investigated before. This research work provides a fundamental database of mixture sorption, diffusion, and permeation data in solubility selective polymers. Two solubility selective polymers were studied: poly(dimethylsiloxane) (PDMS) and poly(1-trimethylsilyl-1-propyne) (PTMSP). The vapor/gas mixture was n-C4H10/CH4. CH4 partial pressures ranged from 1.1 to 16 atm, and [subscript n-]C₄H₁₀ partial pressures ranged from 0.02 to 1.7 atm. Temperatures studied ranged from -20 to 50 °C. The pure and mixed gas [subscript n-]C₄H₁₀ and CH₄ permeability and solubility coefficients in PDMS and PTMSP were determined experimentally using devices constructed specifically for these measurements. The pure and mixed gas diffusion coefficients were calculated from permeability and solubility data. In rubbery PDMS, the presence of [subscript n-]C₄H₁₀ increases CH₄ permeability, solubility, and diffusivity. On the other hand, the presence of CH₄ does not measurably influence [subscript n-]C₄H₁₀ sorption and transport properties. The [subscript n-]C₄H₁₀/CH₄ mixed gas permeability selectivities are lower than those estimated from pure gas measurements. This difference is due to both lower solubility and diffusivity selectivities in mixtures relative to those in pure gas. Plasticization of PDMS by [subscript n-]C₄H₁₀ does little to n-C4H10/CH₄ mixed gas diffusivity selectivity. Increases in mixed gas permeability selectivity with increasing [subscript n-]C₄H₁₀ activity and decreasing temperature were mainly due to increases in solubility selectivity. Unlike PDMS, the presence of [subscript n-]C₄H₁₀ decreases CH₄ permeability, solubility, and diffusivity in PTMSP. The competitive sorption and the blocking effects significantly reduce CH₄ solubility and diffusion coefficients in the polymer, respectively. However, similar to PDMS, the presence of CH₄ has no measurable influence on [subscript n-]C₄H₁₀ sorption and transport properties. [subscript n-]C₄H₁₀ /CH₄ mixed gas permeability selectivities in PTMSP are higher than those determined from the pure gas measurements. This deviation is a result of higher solubility and diffusivity selectivities in mixtures relative to the pure gas… Advisors/Committee Members: Freeman, B. D. (Benny D.) (advisor).

Subjects/Keywords: Gases – Absorption and adsorption; Gases – Transport properties; Diffusion; Permeability; Gases – Solubility; Gases – Separation; Membrane separation; Polymers

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APA (6^th Edition):

Raharjo, Roy Damar, 1. (2007). Mixed gas sorption and transport study in solubility selective polymers. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/3651

Chicago Manual of Style (16^th Edition):

Raharjo, Roy Damar, 1981-. “Mixed gas sorption and transport study in solubility selective polymers.” 2007. Doctoral Dissertation, University of Texas – Austin. Accessed January 16, 2021. http://hdl.handle.net/2152/3651.

MLA Handbook (7^th Edition):

Raharjo, Roy Damar, 1981-. “Mixed gas sorption and transport study in solubility selective polymers.” 2007. Web. 16 Jan 2021.

Vancouver:

Raharjo, Roy Damar 1. Mixed gas sorption and transport study in solubility selective polymers. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2007. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2152/3651.

Council of Science Editors:

Raharjo, Roy Damar 1. Mixed gas sorption and transport study in solubility selective polymers. [Doctoral Dissertation]. University of Texas – Austin; 2007. Available from: http://hdl.handle.net/2152/3651

University of Texas – Austin

23. Kelman, Scott Douglas, 1979-. Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases.

Degree: PhD, Chemical Engineering, 2008, University of Texas – Austin

URL: http://hdl.handle.net/2152/3909

► The removal of higher hydrocarbons from natural gas streams is an important separation that has been identified as a growth area for polymer membranes. An… (more)

▼ The removal of higher hydrocarbons from natural gas streams is an important separation that has been identified as a growth area for polymer membranes. An ideal membrane material for this separation would be more permeable to higher hydrocarbons (i.e., C3+ compounds) than to CH₄. This allows the CH₄ rich permeate to be retained at or near feed pressure, thus minimizing the requirement for repressurization followingmembrane separation. A polymer which demonstrates the ability to separate vapor from gases with high efficiency is poly [1-(trimethylsilyl)-1-propyne] (PTMSP). PTMSP is a stiff chain, high free volume glassy polymer well known for its very high gas permeability and outstanding vapor/gas selectivity. However, PTMSP is soluble in many organic compounds, leading to potential dissolution of the membrane in process streams where its separation properties are of greatest interest. PTMSP also undergoes significant physical aging, which is the gradual relaxation of non-equilibrium excess free volume in glassy polymers. Crosslinking PTMSP with bis(azide)s was undertaken in an attempt to increase the solvent resistance and physical stability of the polymer. A fundamental investigation into crosslinking PTMSP with a bis(azide) crosslinker was the focus of this thesis. Pure gas transport measurements were conducted with N₂, O₂, CH₄, C₂H6, C₃H₈, and n-C₄H₁₀ over temperatures raging from -20°C to 35°C and pressures ranging from 0 to 20 atm. Mixed gas permeation experiments were conducted using a 98 mol % CH₄, and 2 mol % n-C₄H₁₀ mixture. The mixed gas permeation experiments were conducted at temperatures ranging from -20°C to 35°C, and pressures ranging from 4 to 18 atm. Inorganic nanoparticles such as fumed silica (FS) were added to uncrosslinked and crosslinked PTMSP, and the effects of their addition on the transport properties were investigated. Crosslinking PTMSP with bis(azide)s increases its solvent resistance, and crosslinked films are insoluble in common PTMSP solvents such as toluene. At all temperatures, the initial pure and mixed gas permeabilities of crosslinked PTMSP films are less than those of uncrosslinked PTMSP. This decrease in permeability is consistent with the fractional free volume (FFV) decrease that accompanies crosslinking. Pure gas solubility coefficients are relatively unaffected by the crosslinking process, so the decrease in permeability is caused by decreases in diffusivity. The addition of FS nanoparticles increases the initial pure and mixed gas permeabilities of uncrosslinked and crosslinked PTMSP. The pure gas permeabilities and solubilities of all PTMSP films increase when the temperature decreases, while the diffusivities decrease. The rates of change in pure gas transport properties with temperature is similar for all films, so the temperature dependence of pure gas transport properties of PTMSP is unaffected by the addition of crosslinks or FS. The aging of uncrosslinked and crosslinked PTMSP films was investigated by monitoring N₂, O₂ and CH₄ permeabilities and FFV over time.… Advisors/Committee Members: Freeman, B. D. (Benny D.) (advisor).

Subjects/Keywords: Gas separation membranes; Crosslinked polymers; Polymers – Stability; Polymers – Solubility; Hydrocarbons – Separation; Gases – Separation

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

APA (6^th Edition):

Kelman, Scott Douglas, 1. (2008). Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/3909

Chicago Manual of Style (16^th Edition):

Kelman, Scott Douglas, 1979-. “Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases.” 2008. Doctoral Dissertation, University of Texas – Austin. Accessed January 16, 2021. http://hdl.handle.net/2152/3909.

MLA Handbook (7^th Edition):

Kelman, Scott Douglas, 1979-. “Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases.” 2008. Web. 16 Jan 2021.

Vancouver:

Kelman, Scott Douglas 1. Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2008. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2152/3909.

Council of Science Editors:

Kelman, Scott Douglas 1. Crosslinking and stabilization of high fractional free volume polymers for the separation of organic vapors from permanent gases. [Doctoral Dissertation]. University of Texas – Austin; 2008. Available from: http://hdl.handle.net/2152/3909

Georgia Tech

24. Kratochvil, Adam Michal. Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification.

Degree: PhD, Chemical Engineering, 2008, Georgia Tech

URL: http://hdl.handle.net/1853/29678

► Membrane separations are rapidly growing alternatives to traditionally expensive gas separation processes. For natural gas purification, membranes are used to remove carbon dioxide to prevent… (more)

▼ Membrane separations are rapidly growing alternatives to traditionally expensive gas separation processes. For natural gas purification, membranes are used to remove carbon dioxide to prevent pipeline corrosion and increase the heating value of the natural gas. The robust chemical and physical properties of polyimide membranes make them ideal for the numerous components and high pressures associated with natural gas production. Typically, the performance of membranes changes over time as a result of physical aging of the polymer. Previous work shows that the thin selective layer of an asymmetric hollow fiber membrane, the morphology of choice for gas separations, ages differently than a thick dense film of the same material. Also, carbon dioxide, which is highly soluble in most polymers, can actively swell and plasticize polymer membranes at higher pressures. In this work, free acid groups present in the model polyimide are covalently crosslinked to stabilize the matrix against plasticization. Physical aging of two different crosslinked derivatives are compared to the free acid polyimide through gas permeation, gas sorption, and refractive index measurements. Thick (~50 m) and thin (~650 nm) films are examined to determine the effects of sample dimension on physical aging. The crosslinking mechanism employs diol substituents to form ester linkages through the free acid group. However, the annealing treatment, above the glass transition temperature, used to "reset" the thermal history of the films is found to form a new crosslinked polymer. Characterization of this new crosslinking mechanism reveals a high-temperature decarboxylation of the free acid creates free-radical phenyl groups which form covalent crosslinks through other portions of the polymer structure. Since ester crosslinks may be vulnerable to hydrolysis in aggressive gas feed streams, this new mechanism of crosslinking may create a more robust membrane for aggressive separations. In addition to the physical aging study, supercritical carbon dioxide conditioning of the two glycol crosslinked polyimides is compared to the free acid polymer. In this case, the free acid polymer is not crosslinked since the esterification crosslinking reaction occurs at much lower temperature than the decarboxylation mechanism. The free acid polymer displays an atypical permeation response under supercritical carbon dioxide conditions which suggests a structural reorganization of the polymer occurs. The crosslinked polymers do not exhibit this type of response. Mixed gas permeation confirms a substantial decrease in the productivity of the free acid polyimide and reveals the enhanced stability of the crosslinked polyimides following the supercritical carbon dioxide conditioning. Finally, examination of structurally similar fluorine-containing polyimides following approximately 18 years of aging allows the study of polymer structure on physical aging. A 6FDA-based polyimide is compared to a BPDA-based polyimide to understand the effects of bulky, CF3… Advisors/Committee Members: Koros, William (Committee Chair), Beckham, Haskell (Committee Member), Eckert, Charles (Committee Member), Henderson, Cliff (Committee Member), Meredith, Carson (Committee Member).

Subjects/Keywords: Supercritical carbon dioxide; Physical aging; Natural gas; Membrane; Polyimide; Gases Purification; Gases Separation; Gas separation membranes; Polyimides; Membrane separation

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APA (6^th Edition):

Kratochvil, A. M. (2008). Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/29678

Chicago Manual of Style (16^th Edition):

Kratochvil, Adam Michal. “Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification.” 2008. Doctoral Dissertation, Georgia Tech. Accessed January 16, 2021. http://hdl.handle.net/1853/29678.

MLA Handbook (7^th Edition):

Kratochvil, Adam Michal. “Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification.” 2008. Web. 16 Jan 2021.

Vancouver:

Kratochvil AM. Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification. [Internet] [Doctoral dissertation]. Georgia Tech; 2008. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/1853/29678.

Council of Science Editors:

Kratochvil AM. Thickness dependent physical aging and supercritical carbon dioxide conditioning effects on crosslinkable polyimide membranes for natural gas purification. [Doctoral Dissertation]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/29678

Universiteit Utrecht

25. Gubbels, K.B. Exotic Superfluidity in Imbalanced Fermi Mixtures.

Degree: 2010, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/37504

► We consider ultracold imbalanced Fermi gases with strong attractive interactions, for which Cooper-pair formation plays an important role. The two-component mixtures consist either of identical… (more)

▼ We consider ultracold imbalanced Fermi gases with strong attractive interactions, for which Cooper-pair formation plays an important role. The two-component mixtures consist either of identical fermionic atoms in two different hyperfine states, or of two different atomic species. In both cases, the number of atoms for each component is allowed to be different, leading to a spin imbalance or a polarization. In the second case, the two different species also give rise to a mass imbalance for the particles. Imbalanced Fermi mixtures play a fundamental role in condensed-matter, nuclear and astroparticle physics. Experimentally, the atomic mixtures are made strongly interacting with the use of two-channel Feshbach resonances. We start out by treating these in more detail. We review the relevant scattering theory, and apply it to the well-studied case of resonant s-wave collisions with zero angular momentum. Furthermore, we discuss the less-studied case of p-wave collisions with nonzero angular momentum, and the inhomogeneous case due to a trapping potential. Having discussed the two-body physics, we turn to the many-body physics. The pioneering experimental studies of Cooper pairing in lithium-6 mixtures with a spin imbalance were performed by Zwierlein et al. [Science 311, 492 (2006)] and Partridge et al. [Science 311, 503 (2006)]. We study the mean-field theory for the polarized Fermi mixture to obtain a qualitative understanding of these experiments. In the unitarity limit, where the scattering length of the interatomic interaction diverges, the theory gives rise to two exotic superfluid phases that are absent in the balanced mixture. These are the gapless superfluid Sarma phase and the phase-separated phase. By using renormalization group techniques to account for the effects of strong interactions, we obtain also quantitative agreement with Monte-Carlo calculations and experiments. We then generalize our knowledge of the solely spin-imbalanced mixture to the mass-imbalanced case, where in particular the mixture consisting of lithium-6 and potassium-40 is experimentally promising. We study the mean-field phase diagram for this mixture in the unitarity limit, where we not only find phase separation and Sarma superfluidity, but also a Lifshitz point. The latter signals an instability towards a supersolid phase. We also include the effects of fluctuations, which do not alter the topology of the phase diagram. However, fluctuation effects lower the critical temperatures with an experimentally relevant factor of three. Finally, we study superfluidity in a fully polarized gas of potassium-40 atoms near a p-wave Feshbach resonance. In particular, we consider coherent Josephson oscillations between the superfluid components in the two channels of the resonance, whose frequencies contain a clear signature of the quantum phase transition that occurs as a function of applied magnetic field.

Subjects/Keywords: Natuur- en Sterrenkunde; Superfluidity; Superconductivity; Bose-Einstein condensation; Supersolidity; Feshbach resonances; Fermi mixtures; Quantum gases; Phase separation; Josephson oscillations

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APA (6^th Edition):

Gubbels, K. B. (2010). Exotic Superfluidity in Imbalanced Fermi Mixtures. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/37504

Chicago Manual of Style (16^th Edition):

Gubbels, K B. “Exotic Superfluidity in Imbalanced Fermi Mixtures.” 2010. Doctoral Dissertation, Universiteit Utrecht. Accessed January 16, 2021. http://dspace.library.uu.nl:8080/handle/1874/37504.

MLA Handbook (7^th Edition):

Gubbels, K B. “Exotic Superfluidity in Imbalanced Fermi Mixtures.” 2010. Web. 16 Jan 2021.

Vancouver:

Gubbels KB. Exotic Superfluidity in Imbalanced Fermi Mixtures. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2010. [cited 2021 Jan 16]. Available from: http://dspace.library.uu.nl:8080/handle/1874/37504.

Council of Science Editors:

Gubbels KB. Exotic Superfluidity in Imbalanced Fermi Mixtures. [Doctoral Dissertation]. Universiteit Utrecht; 2010. Available from: http://dspace.library.uu.nl:8080/handle/1874/37504

Texas Tech University

26. Clancy, Donald J. Rigorous numerical simulation of gas separation by hollow-fiber membranes.

Degree: Chemical Engineering, 1996, Texas Tech University

URL: http://hdl.handle.net/2346/10229

► The work develops numerically-stable computer models to simulate the performance of cocurrent, and countercurrent membranes. Additionally, a previously unreported gas-flow pattern, a variance of cross… (more)

Subjects/Keywords: Gases; Gas separation membranes; Membranes (Technology); Carbon dioxide

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APA (6^th Edition):

Clancy, D. J. (1996). Rigorous numerical simulation of gas separation by hollow-fiber membranes. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/10229

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):

Clancy, Donald J. “Rigorous numerical simulation of gas separation by hollow-fiber membranes.” 1996. Thesis, Texas Tech University. Accessed January 16, 2021. http://hdl.handle.net/2346/10229.

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

MLA Handbook (7^th Edition):

Clancy, Donald J. “Rigorous numerical simulation of gas separation by hollow-fiber membranes.” 1996. Web. 16 Jan 2021.

Vancouver:

Clancy DJ. Rigorous numerical simulation of gas separation by hollow-fiber membranes. [Internet] [Thesis]. Texas Tech University; 1996. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2346/10229.

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

Council of Science Editors:

Clancy DJ. Rigorous numerical simulation of gas separation by hollow-fiber membranes. [Thesis]. Texas Tech University; 1996. Available from: http://hdl.handle.net/2346/10229

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

University of Southern California

27. Naserifar, Saber. A process-based molecular model of nano-porous silicon carbide membranes.

Degree: PhD, Chemical Engineering, 2013, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/283510/rec/311

► A broad class of important materials, such as silicon carbide (SiC), are fabricated by temperature-controlled pyrolysis of pre-ceramic polymers. In particular, fabrication of SiC membranes… (more)

▼ A broad class of important materials, such as silicon carbide (SiC), are fabricated by temperature-controlled pyrolysis of pre-ceramic polymers. In particular, fabrication of SiC membranes by pyrolysis of a polymer precursor that contains Si is quite attractive for separation of hydrogen from other gases. It has been quite difficult to extract atomistic-scale information about such SiC membranes, since they are amorphous. The research presented in this dissertation extends the ReaxFF reactive force field to describe the processes involved in the thermal decomposition of hydridopolycarbosilane (HPCS) to form SiC nanoporous membranes. ❧ First, we carry out quantum mechanical calculations on models meant to capture the important reaction steps and structures. Then, we develop a model of the HPCS polymer and utilize ReaxFF to describe the thermal degradation and decomposition of the polymer as the system is heated by molecular dynamics (MD) simulations. In the next step, we use ReaxFF for reactive dynamics of HPCS over a wide range of temperature. We then simulate pyrolysis of the HPCS under conditions that closely mimic the conditions of the fabrication of nanoporous SiC membranes to produce amorphous SiC material. The pyrolysis results and the computed properties of the SiC ceramic are shown to be in good agreement with the experimental data. ❧ To further test the validity of the model and to provide insight into improving the performance of the membrane, extensive MD simulations were carried out to compute the self-diffusivities of H₂, CO₂ and CH₄ in the molecular model of SiC. The results indicate higher values of the diffusivity for H₂. The morphology of the amorphous SiC layer is characterized by computing its accessible free volumes and the cavity distributions. ❧ Finally, we use the molecular model of SiC and non-equilibrium MD simulations in order to study transport and separation in the membrane of two binary gaseous mixtures, namely, H₂/CO₂ and H₂/CH₄ at various temperatures and pressure drops, applied externally to the membrane. When compared with our own experimental data, the model is demonstrated to provide accurate predictions for various properties of interest and, in particular, for the separation factors of the mixtures. The model can be used to determine the optimal membrane's thickness. Advisors/Committee Members: Sahimi, Muhammad (Committee Chair), Haas, Stephan W. (Committee Member), Tsotsis, Theodore T. (Committee Member).

Subjects/Keywords: silicon-carbide membranes; ReaxFF force filed development; pyrolysis simulation of HPCS; amorphous SiC model; diffusion of gases; separation of gaseous mixtures

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APA (6^th Edition):

Naserifar, S. (2013). A process-based molecular model of nano-porous silicon carbide membranes. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/283510/rec/311

Chicago Manual of Style (16^th Edition):

Naserifar, Saber. “A process-based molecular model of nano-porous silicon carbide membranes.” 2013. Doctoral Dissertation, University of Southern California. Accessed January 16, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/283510/rec/311.

MLA Handbook (7^th Edition):

Naserifar, Saber. “A process-based molecular model of nano-porous silicon carbide membranes.” 2013. Web. 16 Jan 2021.

Vancouver:

Naserifar S. A process-based molecular model of nano-porous silicon carbide membranes. [Internet] [Doctoral dissertation]. University of Southern California; 2013. [cited 2021 Jan 16]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/283510/rec/311.

Council of Science Editors:

Naserifar S. A process-based molecular model of nano-porous silicon carbide membranes. [Doctoral Dissertation]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/283510/rec/311

Kansas State University

28. Chu, I-cheng. Interphase mass transfer in various types of column.

Degree: MS, 1957, Kansas State University

URL: http://hdl.handle.net/2097/25126

Subjects/Keywords: Gases – Absorption and adsorption.; Separation (Technology); Masters theses

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

APA (6^th Edition):

Chu, I. (1957). Interphase mass transfer in various types of column. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/25126

Chicago Manual of Style (16^th Edition):

Chu, I-cheng. “Interphase mass transfer in various types of column.” 1957. Masters Thesis, Kansas State University. Accessed January 16, 2021. http://hdl.handle.net/2097/25126.

MLA Handbook (7^th Edition):

Chu, I-cheng. “Interphase mass transfer in various types of column.” 1957. Web. 16 Jan 2021.

Vancouver:

Chu I. Interphase mass transfer in various types of column. [Internet] [Masters thesis]. Kansas State University; 1957. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2097/25126.

Council of Science Editors:

Chu I. Interphase mass transfer in various types of column. [Masters Thesis]. Kansas State University; 1957. Available from: http://hdl.handle.net/2097/25126

Kansas State University

29. Blaha, John Joseph. The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks.

Degree: 1976, Kansas State University

URL: http://hdl.handle.net/2097/11308

Subjects/Keywords: Separation (Technology); Carbonated beverages – Analysis.; Gases – Separation.; Ultrasonic waves – Industrial applications.; Chelates

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APA (6^th Edition):

Blaha, J. J. (1976). The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks. (Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/11308

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):

Blaha, John Joseph. “The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks.” 1976. Thesis, Kansas State University. Accessed January 16, 2021. http://hdl.handle.net/2097/11308.

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

MLA Handbook (7^th Edition):

Blaha, John Joseph. “The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks.” 1976. Web. 16 Jan 2021.

Vancouver:

Blaha JJ. The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks. [Internet] [Thesis]. Kansas State University; 1976. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2097/11308.

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

Council of Science Editors:

Blaha JJ. The use of a Coulter counter to quantitatively determine mold in cabonated soft drinks ; The investigation of dimeric halogen addition to piaselenole ; Ultrasonic attenuation of metal chelates: Use of a Coulter counter to quantitatively determine mold in carbonated soft drinks. [Thesis]. Kansas State University; 1976. Available from: http://hdl.handle.net/2097/11308

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

30. Ma, Canghai. Optimization of asymmetric hollow fiber membranes for natural gas separation.

Degree: MS, Chemical Engineering, 2011, Georgia Tech

URL: http://hdl.handle.net/1853/43700

► Compared to the conventional amine adsorption process to separate CO₂ from natural gas, the membrane separation technology has exhibited advantages in easy operation and lower… (more)

Subjects/Keywords: Optimization; Crosslinking; Plasticization; Hollow fibers; Membrane separation; Gas separation membranes; Membranes (Technology); Gases Separation; Separation (Technology)

…the intrinsic membrane material separation efficiency. For a given pair of pure gases, if… …conditions for xlp2 �� ..52 Table 4.3: Pure gas separation properties of uncrosslinked… …separation properties of uncrosslinked CM5 fibers �� 66 Table 4.7: Hollow fiber spinning dope… …68 Table 4.9: Pure gas separation properties of uncrosslinked CM8 fibers �� 69 Table… …separation properties of uncrosslinked CM9 fibers �� …..70 Table 4.12: Hollow fiber spinning…

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

APA (6^th Edition):

Ma, C. (2011). Optimization of asymmetric hollow fiber membranes for natural gas separation. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/43700

Chicago Manual of Style (16^th Edition):

Ma, Canghai. “Optimization of asymmetric hollow fiber membranes for natural gas separation.” 2011. Masters Thesis, Georgia Tech. Accessed January 16, 2021. http://hdl.handle.net/1853/43700.

MLA Handbook (7^th Edition):

Ma, Canghai. “Optimization of asymmetric hollow fiber membranes for natural gas separation.” 2011. Web. 16 Jan 2021.

Vancouver:

Ma C. Optimization of asymmetric hollow fiber membranes for natural gas separation. [Internet] [Masters thesis]. Georgia Tech; 2011. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/1853/43700.

Council of Science Editors:

Ma C. Optimization of asymmetric hollow fiber membranes for natural gas separation. [Masters Thesis]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/43700

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