MAXIMUM OLEFIN PRODUCTION USING MULTISTAGE REACTION IN THE PRESENCE OF THE CATALYST AND ITS REGENERATION Russian patent published in 2023 - IPC B01J8/26 B01J8/36 C10G11/18 C10G51/02 C10G51/06 

FIELD: chemical industry.

SUBSTANCE: invention relates to a method for increasing the production of olefins from hydrocarbon feedstock. The method includes: a) delivering from a multi-stage catalyst regenerator: a partially regenerated catalyst from at least one partial catalyst regeneration zone to a secondary riser reactor, and a fully regenerated catalyst from at least one full catalyst regeneration zone to a primary riser reactor; b) cracking the hydrocarbon feedstock in a first reaction zone of the primary riser reactor to produce a first cracked product containing olefins and a spent catalyst, and delivering the first cracked product and spent catalyst to a bed cracking reaction zone in the reactor vessel to produce a second cracked product; c) separating the first and second cracked products from the spent catalyst in a reactor vessel; d) recovering first and second cracked products containing olefins and separating uncracked residues and partially cracked product(s) from the first and second cracked products; e) cracking the recycle feed containing at least one of the non-cracked residues, partially cracked and cracked products from step (d) in a secondary riser reactor to produce a third cracked product and additional spent catalyst; f) separating and recovering a third olefin-containing cracked product from the additional spent catalyst and delivering the additional spent catalyst to a reactor vessel; and g) delivering the spent catalyst from the reactor vessel to a multi-stage catalyst regenerator comprising a partial catalyst regeneration zone and a complete catalyst regeneration zone, wherein the spent catalyst is partially regenerated to form a partially regenerated catalyst, and a portion of the partially regenerated catalyst is delivered to a complete catalyst regeneration zone to obtain a fully regenerated catalyst, wherein the partial catalyst regeneration zone and the full catalyst regeneration zone are located in different regeneration tanks sequentially relative to each other with respect to the catalyst flow. The invention also relates to a cracking system.

EFFECT: use of the present invention makes it possible to increase the efficiency of catalytic cracking of gas oils or residual oils or mixtures to maximize the production of olefins.

25 cl, 8 dwg