SOLVENT EXTRACTION RECOVERY OF SHALE OIL

摘要

An improved process for solvent extraction of organic matter from shale by two extraction steps in sequence. The extraction steps are: (a) treating a kerogen-containing shale with a solvent system comprising a combination of water and an alcohol at a temperature of about 375.degree.-425.degree.C, and (b) treating the product of (a) with a solvent system comprising a combination of an alcohol and another organic solvent at an elevated temperature, but not above about 425.degree.C. The organic matter is recovered by separating the liquid which results from step (b) from the shale solids.