SUPERCRITICAL FLUID EXTRACTION OF A CRUDE-OIL, BITUMEN-DERIVED LIQUID AND BITUMEN BY CARBON-DIOXIDE AND PROPANE

FUEL

卷:71

Article; Proceedings Paper

关键词: SUPERCRITICAL EXTRACTION;    CRUDE OIL;    BITUMEN;   

DOI  :  10.1016/0016-2361(92)90229-H

来源: Elsevier

【 摘 要 】

Extractions of a crude oil, a bitumen-derived liquid and bitumen were conducted at several temperatures and pressures with carbon dioxide and propane in order to assess the effect of the size and type of compounds in the feedstocks on the extraction process. The pure-solvent density at the extraction conditions was not the only variable governing extraction, and the proximity of the extraction conditions to the pure-solvent critical temperature affected the extraction yields and the compositions of the extract phases. Higher oil yields were obtained at lower solvent reduced densities when the extraction temperatures were in the vicinity of the pure solvent critical temperature. In the crude oil and native bitumen extractions, as the extraction time and/or the extraction pressure increased, heavier compounds were found in the extract phases. This preferential extraction was not observed with the bitumen-derived liquid. The non-discriminatory extraction behaviour of the bitumen-derived liquid was attributed to its thermal history and to the presence of olefins and significant amounts of aromatics. Phase behaviour calculations using the Peng-Robinson equation of state and component lumping procedures provided reasonable agreement between calculated and experimental results for the crude oil and bitumen extractions. but failed to predict the bitumen-derived liquid extractions.

【 授权许可】

Free