Journal of the Japan Petroleum Institute
Online ISSN : 1349-273X
Print ISSN : 1346-8804
ISSN-L : 1346-8804
Review Paper -Feature Articles: Heavy Oil Upgrading in Supercritical Water-
Solvent Effect of Water on Supercritical Water Treatment of Heavy Oil
Masato Morimoto Yoshikazu SugimotoShinya SatoToshimasa Takanohashi
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2014 Volume 57 Issue 1 Pages 11-17

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Abstract

The advantage of using supercritical water (SCW) as a reaction medium for bitumen upgrading was investigated through comprehensive analyses and comparisons of the products obtained using SCW or high-pressure nitrogen. SCW showed almost no chemical effect, but it showed a dispersion effect that led to intramolecular dehydrogenation of the heavier component and prevented recombination reactions. The optimal condition for maximizing this dispersion effect was estimated using the dielectric constant and Hansen solubility parameter (HSP). The necessary condition of SCW to show good miscibility with heavy oil was when the dielectric constant was >2.2 and the HSP hydrogen bonding component was <10 MPa0.5. The optimal conditions were confirmed by the highest extraction yield of asphaltene and the greatest yield of upgraded oil.

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© 2014 by The Japan Petroleum Institute
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