Patent ID: 8088274
Filing Date: 2012-01-03
Classification: C10G

Abstract:
1. Process for fluidized catalytic cracking, operating in petrochemical mode, of a petroleum hydrocarbon fraction, for increasing production of light olefins, characterized in that it comprises the following steps: a) introduction of a feedstock constituted by a hydrocarbon fraction from petroleum refining with an initial boiling point higher than 220° C. at an inlet port close to the base of an FCC reactor, to make contact with a mixed zeolites catalyst diluted with a minimum flow of carrier vapor, so as to guarantee a stable flow of catalyst and a higher temperature to totally vaporize the feedstock into the reactor, initiating primary catalytic cracking reactions in a first reaction section, said mixed zeolites catalyst comprising a proportion of 10 to 90% by weight of a zeolite Y mixed with a specific catalyst zeolite Z for catalytic cracking olefin precursors of light olefins; b) injection of a rapid cooling fluid which aids the minimum flow of the carrier vapor in a proportion of 5 to 30% by weight of the flow of feedstock at least one point ¼ to ½ above the feedstock inlet port, creating a second reaction section for secondary catalytic cracking reactions at lower temperatures; and c) recovery of the products discharged at the top of the reactor, with a gain in conversion and a gain in selectivity of greater than 10 wt % for production of propene and greater than 50 wt % for ethene, in detriment of gasoline yields, when compared with the process without injecting the rapid cooling fluid.