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Abstract
Nine Chinese lignite samples were extracted with toluene using a nonisothermal experimental technique at sub- and supercritical conditions in a semi-continuous apparatus. The effects of lignite properties, pressure, and H-donor solvent on the yields were investigated.
The results show that the oil yield is about 1.8 to 2.7 times that of Fischer assay and the conversion and extract yield increase linearly with the increase of volatile matter of lignite and pressure. When a H-donor solvent (tetraline) is added to the solvent (toluene), the conversion and extract yield are increased.