Patent ID: 6569316
Filing Date: 2003-05-27
Classification: C10G

Abstract:
A fluid catalytic cracking process comprising:(a) contacting a FCC feed with a catalytic cracking catalyst in a first catalytic cracking stage under catalytic cracking conditions to produce cracked products wherein said catalytic cracking catalyst is a large pore zeolite having a pore diameter greater than about 0.7 nm; (b) separating at least a cycle oil fraction from the cracked products, said cycle oil fraction comprising aromatics; (c) hydrogenating at least a fraction of said aromatics in at least a portion of said cycle oil fraction in the presence of a hydrogenating catalyst under hydrogenation conditions to form a hydrogenated cycle oil; and, (d) contacting said hydrogenated cycle oil with a catalytic cracking catalyst under catalytic cracking conditions in a second fluid catalytic cracking stage to form a second cracked product, said second fluid catalytic cracking stage being separate from said first second fluid catalytic cracking stage, wherein the catalyst of the second fluid catalytic cracking stage comprises between about 50 and about 95 wt. % of a catalyst containing a shape-selective zeolite having a pore diameter less than about 0.7 nm, and between about 5 and about 50 wt. % of a catalyst containing a large-pore zeolite having a pore diameter greater than or equal to about 0.7 nm.