Patent ID: 6811682
Filing Date: 2004-11-02
Classification: C10G

Abstract:
A method for catalytically cracking a primary feed comprising the continuous steps of:(a) injecting the primary feed into an FCC riser reactor having at least a first reaction zone and a second reaction zone upstream of the first reaction zone, the primary feed being injected into the first reaction zone; (b) cracking the primary feed in the first reaction zone under catalytic cracking conditions in the presence of a catalytically effective amount of a regenerated, zeolite-containing, catalytic cracking catalyst in order to form at least partially spent catalyst and a cracked product; (c) separating at least a cycle oil from the cracked product, which cycle oil has a concentration of tetralins and indans of less than about 10 wt. %, and then hydroprocessing at least a portion of the cycle oil in the presence of a catalytically effective amount of a hydroprocessing catalyst under hydroprocessing conditions in order to form a hydroprocessed cycle oil having a concentration of tetralins and indans of at least about 20 wt. %; (d) injecting the hydroprocessed cycle oil into the second reaction zone; and (e) cracking the hydroprocessed cycle oil under cycle oil catalytic cracking conditions in the presence of the catalytic cracking catalyst.