METHOD OF THERMAL PROCESSING HIGH-SULFUR OIL SHALES Russian patent published in 2017 - IPC C10B53/06 

FIELD: chemistry.

SUBSTANCE: this method includes drying shredded shales, their thermal decomposing with the formation of a coke-ash residue and a gas-vapour mixture, combusting the coke-ash residue to form ash, purifying the gas-vapour mixture from mechanical impurities, isolating resin fractions from the gas-vapour mixture, boiling above 175°C, cooling the remaining gas-vapour mixture with its separation into a gas of semi-coking, subresin water and gasoline fraction of resin boiling up to 175°C and rectifying the latter with sequential separation of three fractions with the boiling ranges of 79-90°C, 90-116°C and 116-145°C, each of which is subjected to further extractive distillation in the presence of a solvent, followed by isolation from it by rectification of thiophene, methylthiophene concentrates and dimethylthiophenes, respectively, from each fraction. A mixture of N-formylmorpholine and propylene carbonate is used as a solvent. The thermal decomposition of the shredded oil shale particles is carried out in the fluidized bed reactor, and the ash formed by combusting the coke-ash residue in the cyclone furnace is used as a heat carrier to heat air to be combusted in the cyclone furnace, natural gasoline is released from shale gas. A portion of shale gas is withdrawn after the stage of releasing natural gas for recycling to the fluidized bed reactor and is used there as a fluidizing agent and a heat carrier, shale gas is purified from hydrogen sulfide and carbon dioxide, a portion of shale gas in the furnace is combusted, the flue gases produced by combustion in the furnace are directed to the heat exchanger for heating the gaseous heat carrier.

EFFECT: increasing the efficiency of the primary thermal processing of sulfur fuels by intensifying heat-mass transfer processes in the fluidized bed reactor.

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