Asphaltene rejection from bitumens via supercritical fluid extraction

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Research Institute Institute for Clean and Secure Energy (ICSE)
Author Deo, M. D.; Hanson, F. V.
Title Asphaltene rejection from bitumens via supercritical fluid extraction
Date 1993
Description Supercritical fluid extraction (SFE) of bitumen was carried out in a continuous extractor using propane as the solvent at several temperatures and pressures. The asphaltene contents of the residual fractions in the extractor were compared to the asphaltene content of the original bitumen. Asphaltenes were defined as pentane insolubles in this study. It was found that the absolute asphaltene content of the residual fractions exceeded the asphaltene content of the original bitumen. Even when the asphaltene content was prorated by the weight percent of the residual material, it was found to be higher than the original asphaltene content. The data established that the types of compounds separating as asphaltenes changed as the nature of the mixture was altered by SFE. The data also indicated that it may be inappropriate to perform asphaltene material balances to assess the amount of precipitate. The original asphaltene content of a bitumen that is undergoing compositional changes in a sequence of operations may not be an accurate measure of the precipitating tendency of the bitumen in production and processing operations. The asphaltene content of the residual material varied depending on the extraction conditions and was as much as 3-5 times the original asphaltene content. The asphaltene content of the residual material was a maximum at the most efficient extraction condition which was in the vicinity of the critical temperature of propane. The H/C atomic ratio of the residual fractions was lower compared to the original bitumen, indicating that the ratio of polar to nonpolar compounds may also be important from precipitation considerations. Saturate and aromatic compounds were preferentially extracted and the ratio of asphaltenes to resins increased in the residual fractions relative to the original bitumen.
Type Text
Publisher University of Kentucky, Institute for Mining and Minerals Research
Subject asphaltene rejection; bitumen; supercritical fluid extraction; SFE; asphaltene content
Language eng
Conference Title 1992 Eastern Oil Shale Symposium
Bibliographic Citation Deo, M. D., & Hanson, F. V. (1993). Asphaltene rejection from bitumens via supercritical fluid extraction. Proceedings: 1992 Eastern Oil Shale Symposium; Oil shale, tar sands, heavy oil, 159-168.
Relation Has Part Proceedings: 1992 Eastern Oil Shale Symposium; Oil shale, tar sands, heavy oil, pp. 159-168 (1993)
Rights Management (c)University of Kentucky, Institute for Mining and Minerals Research
Identifier ir-eua/id/2762
Source DSpace at ICSE
ARK ark:/87278/s67973rj
Setname ir_eua
ID 213907
Reference URL https://collections.lib.utah.edu/ark:/87278/s67973rj