METHOD FOR CATALYTIC CRACKING WITH INCREASED PRODUCTION OF GASOLINE HAVING LOW OLEFIN CONTENT AND HIGH OCTANE NUMBER Russian patent published in 2022 - IPC C10G47/00 

FIELD: oil industry.

SUBSTANCE: invention relates to catalytic cracking. A method for catalytic cracking is described, containing: i) spraying heavy crude oil in an elevator reactor by means of the first nozzle and exposing it to the action of a catalytic cracking reaction to obtain a product of catalytic cracking reaction; ii) separating the product of catalytic cracking reaction to obtain catalytic cracking gasoline and light recycled gas oil of catalytic cracking; iii) separating catalytic cracking gasoline obtained at the stage ii) and optionally catalytic cracking gasoline from an external source to obtain a fraction of light gasoline, a fraction of medium gasoline and a fraction of heavy gasoline; (iv) exposing light recycled gas oil of catalytic cracking obtained at the stage ii) and optionally light recycled gas oil of catalytic cracking from an external source to hydrotreating to obtain hydrogenated light recycled gas oil; (v) mixing part of the fraction of light gasoline obtained at the stage iii) with at least part of hydrogenated light recycled gas oil obtained at the stage iv) to obtain a mixed fraction; vi) spraying the mixed fraction obtained at the stage v) in the elevator reactor by means of the second nozzle and exposing it to the action of a catalytic cracking reaction; vii) spraying part of the fraction of medium gasoline obtained at the stage iii) in the elevator reactor by means of the third nozzle and exposing it to the action of a catalytic cracking reaction. A separation boundary between the fraction of light gasoline and the fraction of medium gasoline is from 60 to 80°C, and a separation boundary between the fraction of medium gasoline and the fraction of heavy gasoline is from 120 to 130°C.

EFFECT: proposed method makes it possible to reduce the production of light recycled gas oil and increase the production of catalytic cracking gasoline along with a decrease in the olefin content in catalytic cracking gasoline and an increase in its octane number.

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