PROCESS FOR THERMALLY PROCESSING HIGH-SULFUR COMBUSTIBLE SHALES Russian patent published in 2000 - IPC

FIELD: solid combustible treatment. SUBSTANCE: process includes: drying crushed shales, solid heat carrier-mediated thermal decomposition of dried shales to form coke-ash residue and gas-vapor mixture, combustion of coke-ash residue to form ashes, which are returned as solid heat carrier into thermal decomposition stage, removing solid impurities from gas- vapor mixture, isolation of fractions boiling above 175 C from gas-vapor mixture, cooling remaining gas-vapor mixture to separate it into semicoking gas, pyroligenous liquor, and gasoline fraction boiling away below 175 C, and rectification of the latter. According to invention, rectification of gasoline fraction produces three fractions: 79-90 C, 90- 116 C, and 116-145 C, each of which is subjected to further extractive rectification in presence of N-methylpyrrolidone, followed by the rectification mediated-isolation from the latter of thiophene, concentrate of methylthiophenes, and dimethylthiophene concentrate. EFFECT: enhanced process efficiency. 1 dwg, 3 ex