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Extraction of Hydrocarbons from Bitumen and Bitumen-containing Process and Process Waste Streams using Supercritical Carbon Dioxide
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- Author / Creator
- Cossey, Heidi
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Extractions of hydrocarbons from bitumen and bitumen-containing process and process waste streams generated from surface mined oil sands were conducted using supercritical carbon dioxide (SC-CO2). Dynamic extractions were performed on a bench-scale batch supercritical fluid extraction (SFE) system at a SC-CO2 density of 0.78 g/mL. Initial dynamic extractions of bitumen tested the effects of two modifiers, toluene and methanol, at concentrations of 5, 10 and 15 mol% in SC-CO2 on the extraction efficiency and the type of hydrocarbons extracted. Toluene extracted a higher, heavier mass percentage of hydrocarbons than an equivalent molar or mass concentration of methanol or SC-CO2 alone. The condition of 15 mol% toluene in SC-CO2 resulted in the highest extraction efficiency of 75.9 wt% and was then tested on the bitumen-containing process and process waste streams. At 15 mol% in SC-CO2, toluene was capable of extracting 72.3 and 68.6 wt% of the hydrocarbons from the process and process waste streams, respectively. Dynamic extractions of process and process waste streams indicated that the presence of water can have a slightly positive effect on the extraction of hydrocarbons, and the presence of solids does not substantially impact the extraction.
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- Subjects / Keywords
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- Graduation date
- Spring 2019
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- 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. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. 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.