Rheology of Bitumen at the Onset of Asphaltene Aggregation and its Effects on the Stability of Water-in-Oil Emulsion Open Access
- Other title
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Nazemifard, Neda / Chemical and Materials Engineering Department
- Examining committee member and department
Yeung, Tony (Chemical and Materials Engineering Department )
Chung, Hyun-Joong (Chemical and Materials Engineering Department)
Sauvageau, Dominic (Chemical and Materials Engineering Department)
Department of Chemical and Materials Engineering
- Date accepted
- Graduation date
Master of Science
- Degree level
Asphaltenes are the heaviest fraction of bitumen. Asphaltenes not only play an important role in the high viscosity of bitumen but also in the water-in-oil (W/O) emulsion stability. Nevertheless, their exact function in the stability mechanism of W/O emulsion still remains unresolved. It is observed that asphaltenes are very inclined to form aggregates in organic solvents, especially in aliphatic solvents. The existence of such aggregates alters the rheological properties of bitumen in macro-and nanoscale. In this thesis, the focus of the study is on the role of asphaltenes aggregation on rheological properties of diluted bitumen. The influence of solvents with different degree of aromaticity on asphaltenes aggregation/precipitation is further investigated. Further, nanofluidic chips are designed and fabricated to enable us to inspect the fluid properties (such as penetration, velocity, and viscosity) in the nano-confinement geometry. Capillary-driven flow is used to transport pure solvents and diluted bitumen (with or without the presence of asphaltenes aggregation). Finally, theoretical predictions are applied to analyze and compare the data with the experimental values based on capillary filling phenomena.
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
- Citation for previous publication
Mozaffari, S., Tchoukov, P., Atias, J., Czarnecki, J., Nazemifard, N., Effect of Asphaltene Aggregation on Rheological Properties of Diluted Athabasca Bitumen. Energy & Fuels, 2015, DOI: 10.1021/acs.energyfuels.5b00918.Mozaffari, S., Czarnecki, J. and Nazemifard, N. Nanofluidic platfrom for water-in-oil emulsion stability analysis. Proceeding of the 64th Canadian Chemical Engineering Conference, 2014, Niagara Falls, Canada.
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