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You searched for subject:(model asphaltenes). Showing records 1 – 3 of 3 total matches.

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University of Alberta

1. Soleimani Salim, Amir Hassan. Association of Model Compounds of Asphaltenes in Organic Solutions.

Degree: MS, Department of Chemical and Materials Engineering, 2013, University of Alberta

The self-association properties of two model compounds of asphaltene, 2,6-bis[2-(pyren-1-yl)ethyl]pyridine (PyPPy, C41H29N) and 2,6-bis[2-(phenanthren-9-yl)ethyl]pyridine (PhPPh, C37H29N), were studied in deuterated chloroform and deuterated methylene chloride. 1H NMR spectroscopy titration experiments showed that both compounds undergo changes in conformation in solution as a function of solvent, concentration, and water concentration. At low concentrations, below 0.1 mM in chloroform, these compounds gave 1H NMR chemical shifts consistent with intra-molecular interaction, likely due to a folding conformation. At concentrations above 10 mM the 1H NMR chemical shifts were consistent with inter-molecular interactions due to aggregation. Results of spin- lattice relaxation time (T1) measurement and diffusion-ordered spectroscopy (DOSY) experiments are consistent with existence of two conformations at low and high concentrations. The addition of water promotes aggregation of these model compounds even at low concentrations of 10-5 M, likely via hydrogen bonds between the pyridyl nitrogens and water.

Subjects/Keywords: Aggregation behaviour; Asphaltenes; Model compounds of asphaltene

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APA (6th Edition):

Soleimani Salim, A. H. (2013). Association of Model Compounds of Asphaltenes in Organic Solutions. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/ww72bc79v

Chicago Manual of Style (16th Edition):

Soleimani Salim, Amir Hassan. “Association of Model Compounds of Asphaltenes in Organic Solutions.” 2013. Masters Thesis, University of Alberta. Accessed October 19, 2019. https://era.library.ualberta.ca/files/ww72bc79v.

MLA Handbook (7th Edition):

Soleimani Salim, Amir Hassan. “Association of Model Compounds of Asphaltenes in Organic Solutions.” 2013. Web. 19 Oct 2019.

Vancouver:

Soleimani Salim AH. Association of Model Compounds of Asphaltenes in Organic Solutions. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2019 Oct 19]. Available from: https://era.library.ualberta.ca/files/ww72bc79v.

Council of Science Editors:

Soleimani Salim AH. Association of Model Compounds of Asphaltenes in Organic Solutions. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/ww72bc79v


University of Alberta

2. Reaugh, Devin J. Synthesis Towards Nitrogenous Model Bitumen Archipelagos.

Degree: MS, Department of Chemistry, 2015, University of Alberta

The synthesis of functionalized quinolines is described herein. Utilizing condensation reactions, derivatized quinolines were prepared to serve as nitrogen-containing asphaltene islands. Basic halogenated phenylquinolines were synthesized via urea condensations. Highly substituted quinolines were prepared using a Brønsted acid-catalyzed Friedländer condensation. Benzophenone was used in combination with a variety of α-methylene ketones. A novel adaptation for acetophenone was developed. Individual islands were connected to alkyl tethers by reductive cross-electrophile coupling. Bromoarenes were coupled to α-bromo-ω-chlorooalkanes to install tethers with terminal chlorides. A cobalt-manganese catalyst-reductant system was first explored, and a second nickel-zinc system was refined for tether installation. Introductory experiments towards the use of these ω-chloro tethered islands in the synthesis of bis-functionalized ketones was briefly explored using Collman’s Reagent.

Subjects/Keywords: quinolines; model asphaltenes; bitumen; reductive cross-electrophile coupling

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APA (6th Edition):

Reaugh, D. J. (2015). Synthesis Towards Nitrogenous Model Bitumen Archipelagos. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/fn107158p

Chicago Manual of Style (16th Edition):

Reaugh, Devin J. “Synthesis Towards Nitrogenous Model Bitumen Archipelagos.” 2015. Masters Thesis, University of Alberta. Accessed October 19, 2019. https://era.library.ualberta.ca/files/fn107158p.

MLA Handbook (7th Edition):

Reaugh, Devin J. “Synthesis Towards Nitrogenous Model Bitumen Archipelagos.” 2015. Web. 19 Oct 2019.

Vancouver:

Reaugh DJ. Synthesis Towards Nitrogenous Model Bitumen Archipelagos. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2019 Oct 19]. Available from: https://era.library.ualberta.ca/files/fn107158p.

Council of Science Editors:

Reaugh DJ. Synthesis Towards Nitrogenous Model Bitumen Archipelagos. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/fn107158p


University of Michigan

3. Maqbool, Tabish. Understanding the Kinetics of Asphaltene Precipitation from Crude Oils.

Degree: PhD, Chemical Engineering, 2011, University of Michigan

The precipitation of asphaltenes from crude oils can lead to serious challenges during oil production and processing. This study investigates the kinetics of asphaltene precipitation from crude oils using n-alkane precipitants. For several decades, it has been understood that the precipitation of asphaltenes is a solubility driven phenomenon and the previous studies on the effect of time are usually limited to short time scales. By using optical microscopy and centrifugation based separation, we have demonstrated that the time required to precipitate asphaltenes can actually vary from a few minutes to several months, depending on the precipitant concentration used. Our results demonstrate that no single concentration can be identified as the critical precipitant concentration for asphaltene precipitation. We have also been able to establish the solubility of asphaltenes as a function of the precipitant concentration and it is shown that the short-term experiments over-predict the solubility. The effect of temperature on the precipitation kinetics of asphaltenes is also investigated and different competing effects have been identified. We demonstrate that at higher temperatures the precipitation onset time for asphaltenes is shorter and their solubility is higher. We also present a hypothesis to explain these results and demonstrate that the viscosity difference resulting from a change in temperature in the key parameter in the aggregation of asphaltenes. In order to simulate the growth of asphaltene aggregates from the nanometer scale to micron-size particles a generalized geometric population balance model has been successfully developed. The Smoluchowski kernel has been incorporated to describe the aggregation of the asphaltene nanoaggregates that is induced by the addition of a precipitant e.g. heptane. The model has been validated with experimental data for various heptane concentrations and a good fit has been observed in each case. Finally, it is shown that the asphaltenes that precipitate earliest in the precipitation process are the most unstable fraction. They have a higher dielectric constant and contain greater quantities of metals like Ni and V than other asphaltenes. Additionally, they also contain relatively larger quantities of the high polarity fractions as compared to the asphaltenes that precipitate later. Advisors/Committee Members: Fogler, H. Scott (committee member), Kaviany, Massoud (committee member), Savage, Phillip E. (committee member), Solomon, Michael J. (committee member).

Subjects/Keywords: Asphaltenes; Precipitation; Kinetics of Aggregation; Temperature; Population Balance Model; Chemical Engineering; Engineering

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

APA (6th Edition):

Maqbool, T. (2011). Understanding the Kinetics of Asphaltene Precipitation from Crude Oils. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/84624

Chicago Manual of Style (16th Edition):

Maqbool, Tabish. “Understanding the Kinetics of Asphaltene Precipitation from Crude Oils.” 2011. Doctoral Dissertation, University of Michigan. Accessed October 19, 2019. http://hdl.handle.net/2027.42/84624.

MLA Handbook (7th Edition):

Maqbool, Tabish. “Understanding the Kinetics of Asphaltene Precipitation from Crude Oils.” 2011. Web. 19 Oct 2019.

Vancouver:

Maqbool T. Understanding the Kinetics of Asphaltene Precipitation from Crude Oils. [Internet] [Doctoral dissertation]. University of Michigan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/2027.42/84624.

Council of Science Editors:

Maqbool T. Understanding the Kinetics of Asphaltene Precipitation from Crude Oils. [Doctoral Dissertation]. University of Michigan; 2011. Available from: http://hdl.handle.net/2027.42/84624

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