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Interfacial Properties of C5Pe as an Asphaltene Model Compound Open Access


Other title
asphaltene model compound
interfacial shear rheology
water-in-oil emulsions
Type of item
Degree grantor
University of Alberta
Author or creator
Bi, Jiebin
Supervisor and department
Xu, Zhenghe (Chemical Engineering)
Liu, Qingxia (Chemical Engineering)
Examining committee member and department
Liu, Qingxia (Chemical Engineering)
Peichun Amy Tsai (Mechanical Engineering)
Xu, Zhenghe (Chemical Engineering)
Department of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
Master of Science
Degree level
Water-in-oil (W/O) emulsions create many processing problems in petroleum industry. The enhanced stability of droplets and poor separation of emulsions are often associated with the interfacial accumulation of asphaltenes. The complex nature of asphaltenes has complicated the understanding of their interfacial behavior. Model compounds with well-defined structure and similar water-oil interfacial characteristics have provided an effective route to better understand interfacial behavior and the associated stability of emulsions. In this study, N-(1-hexylheptyl)-N’-(5-carbonylicpentyl) perylene-3,4,9,10-tetracarboxylic bisimide (in brief C5Pe) was used as a model compound for asphaltenes to understand the correlation between interfacial behavior and emulsion stability. It was found that the interfacial properties of C5Pe strongly depend on its concentration and water chemistry. At basic condition, C5Pe exhibited high interfacial activity due to ionization of –COOH groups. At higher C5Pe concentrations, the interfacial films exhibited high elasticity (G’) and mechanical strength, corresponding well with rough and densely-packed film morphology and high emulsion stability. The C5Pe films formed on acidic aqueous phase showed high elasticity although the mechanical strength was low. Meanwhile, these films were less packed, and smoother with high compressibility, resulting in unstable W/O emulsions. Additionally, Ca2+ ions were found to rigidify C5Pe films by connecting C5Pe molecules of ionized –COOH groups at high pH.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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