SYSTEMS AND METHODS FOR OBTAINING MIDDLE DISTILLATES AND LOW MOLECULAR WEIGHT OLEFINS FROM HYDROCARBON RAW MATERIAL Russian patent published in 2013 - IPC C10G11/18 C10G51/00 C10G51/02 C10G51/06 

FIELD: oil and gas industry.

SUBSTANCE: method involves catalytic cracking of gasoil as raw material in catalytic cracking zone in fluidised bed (FCC) of lift-reactor by contact of the above gasoil as raw material with the first catalyst under the appropriate conditions of catalytic cracking in the above lift-reactor FCC zone in order to obtain lift-reactor FCC product containing the gasoil cracking product and the first used catalyst; separation of gasoil cracking product and the first used catalyst; recovery of the first used catalyst with obtaining the first recovered catalyst; contact of gasoline as raw material and the second catalyst in intermediate cracking reactor operating under severe conditions appropriate for cracking process in order to obtain the gasoline cracking product containing at least one low molecular weight olefin and the second used catalyst; separation of the above gasoil cracking product into multiple flows of gasoil cracking product and flow of recycled gasoil; recycle at least of some part of one or more flows of gasoil cracking product to the lift-reactor zone; separation of the above gasoline cracking product into multiple flows of gasoline cracking product; and conversion at least of some part of one or more flows of gasoline cracking products to C2-C3 product flow.

EFFECT: increasing the yield of olefins.

10 cl, 3 dwg