Patent ID: 6569315
Filing Date: 2003-05-27
Classification: C10G

Abstract:
A catalytic cracking method, comprising:(a) catalytically cracking a primary feed in a first catalytic cracking unit under catalytic cracking conditions in the presence of a first catalytic cracking catalyst in order to form a cracked product; (b) separating at least a cycle oil from the cracked product and 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 wherein derivatives of decahydronaphthalene boiling above 220Â° C. are substantially absent in the hydroprocessed cycle oil and wherein decahydronaphthalene is the most abundant species among the cyclic and multi-cyclic species present in the hydroprocessed cycle oil; (c) conducting the hydroprocessed cycle oil to a second catalytic cracking unit; and (d) cracking the hydroprocessed cycle oil under cycle oil catalytic cracking conditions in the presence of a second catalytic cracking catalyst in the second catalytic cracking unit in order to form a second cracked product.