Fluidized catalytic cracking

Details Fluidized catalytic cracking Fluidized catalytic cracking

C - Chemistry, Metallurgy

10

G

C10G 11/18 (2006.01) B01J 29/90 (2006.01)

Patent

CA 2130816

In a process for catalytically cracking a heavy feed in a single riser reactor FCC unit, the catalyst inventory contains 3 - 10 wt % of a shape selective zeolite, preferably ZSM-5, in the form of a separate additive particle. The addition of such a large quantity of ZSM-5 as a separate additive produces unexpectedly large amounts of C3/C4 olefins. A high catalyst/feed mix temperature in the base of the riser is preferably employed and the mixture quenched, preferably with a recycled heavy naphtha or light cycle oil, at a distance at least 10% of the length of the riser upstream from the outlet and preferably after at least 1 second of riser cracking.

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