FUEL SCIENCE & TECHNOLOGY INTERNATIONAL, vol.12, no.6, pp.947-960, 1994 (SCI-Expanded)
Supercritical fluid extraction (SFE) of two Turkish lignites and oil shale with toluene mixtures were investigated. Experiments were performed in a batch autoclave at 623 K. Extracts recovered from SFE were fractionated into oils, asphaltenes and preasphaltenes by solvent extraction.