Patent ID: 8764971
Filing Date: 2014-07-01
Classification: B01J,C10G,Y02P

Abstract:
1. A method for catalytic cracking to maximize the production of diesel base stocks, comprising a first cracking reaction step in an upflow fluidized bed reactor, a step of separating the cracked hydrocarbons and coked catalyst, a step of fractionating the cracked hydrocarbons and a step of regenerating said coked catalyst, wherein the hydrocarbon feedstock is injected into the upflow reactor on a catalyst partially deactivated by prior coking of at least part thereof in the same upflow reactor, so that a reaction temperature of the effluents leaving said reactor varies from 470 to 600° C., this prior coking being carried out by injecting at least one hydrocarbon compound having a boiling point equal to or higher than 350° C., on at least part of the regenerated catalyst bounded by at least one zone defined by means of an internal device, the hydrocarbon feedstock to treat being injected downstream from the internal device in said reactor, and a second cracking reaction step in an upflow reactor, operating in parallel to the first cracking step, and in which hydrocarbon cuts having a boiling point equal to or lower than 160° C., and hydrocarbon cuts having a boiling point equal to or higher than 330° C. are recycled on the regenerated catalyst.