Two stage fluid catalytic cracking process for selectively...

Details Two stage fluid catalytic cracking process for selectively... Two stage fluid catalytic cracking process for selectively...

2008-01-29

2008-01-29

Caldarola, Glenn (Department: 1797)

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

C208S072000, C208S074000, C208S077000, C208S158000, C585S324000, C585S648000, C585S653000

Reexamination Certificate

active

07323099

ABSTRACT:
A process for selectively producing C2to C4olefins from feedstock such as a gas oil or resid. The feedstock is reacted in a first stage comprising a fluid catalytic cracking unit wherein it is converted in the presence of a mixture of conventional large pore zeolitic catalyst and a medium pore zeolitic catalyst to reaction products, including a naphtha boiling range stream. The naphtha boiling range stream is introduced into a second stage where it is contacted with a catalyst containing from about 10 to about 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500 to about 650° C. and a hydrocarbon partial pressure from about 10 to about 40 psia (about 70 to about 280 kPa).

REFERENCES:
patent: 4871446 (1989-10-01), Herbst et al.
patent: 6106697 (2000-08-01), Swan et al.

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