Extraction of bitumen with sub- and supercritical water |
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Authors: | Jung Hoon Park Sou Hwan Son |
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Affiliation: | (1) GreenBio Institute, Shimogamo Morimotocho 15, Sakyo-ku, 606-0805 Kyoto, Japan |
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Abstract: | The sub- and supercritical water extractions of Athabasca oil sand bitumens were studied using a micro reactor. The experiments
were carried out in the temperature range of 360–380 °C, pressure 15–30 MPa and water density 0.07–0.65 g/cm3 for 0–2 hrs. The extraction conversion of bitumens increased with solvent power and temperature. A maximum conversion of
24% was obtained after 90 min extraction at the supercritical condition. Hydrogen and carbon mono-oxide were not detected
in sub-critical region but in the supercritical region. The supercritical condition was favorable to the hydrogen formation
for bitumen extraction. The extraction products were upgraded relative to the original bitumens due to direct hydrolysis of
low-energy linkage and H2 formed by water gas shift reaction in supercritical condition. 18% of initial sulfur in bitumen can be removed at maximum
conversion condition. The asphaltene contents of the residue were significantly higher than that of original bitumen due to
preferential extraction of aromatic compounds in supercritical condition. |
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