Use of ZSM-12 in catalytic cracking for gasoline octane improvement and co-production of light olefins
AssigneeMobil Oil Corporation
InventorsThomas F. Degnan, Terry E. Helton
Life of this patent
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Abstract
Heavy oils are subjected to catalytic cracking in the absence of added hydrogen using a catalyst containing a zeolite having the structure of ZSM-12 and a large-pore crystalline zeolite having a Constraint Index less than about 1. The process is able to effect a bulk conversion of the oil while at the same time yielding a higher octane gasoline and increased light olefin content.
Claims16
A catalytic cracking process which comprises catalytically cracking a hydrocarbon feed in the absence of added hydrogen with a cracking catalyst comprising a zeolite having the structure of ZSM-12 and a large-pore, crystalline zeolite having a Constraint Index less than about 1, the weight ratio of the zeolite having the structure of ZSM-12 to the large-pore crystalline zeolite component being in the range of from about 1:10 to about 7:10.
A process for cracking a gas oil to produce a gasoline product of improved octane rating, which comprises catalytically cracking a hydrocarbon feed in the absence of added hydrogen with a cracking catalyst comprising a zeolite having the structure of ZSM-12 and a large-pore, crystalline zeolite having a Constraint Index less than about 1, the weight ratio of the zeolite having the structure of ZSM-12 to the large-pore crystalline zeolite being in the range of from about 1:10 to about 7:10.
A catalytic cracking process elective towards the production of C.sub.4 olefins which comprises catalytically cracking a hyrdocarbon feed in the absence of added hydrogen with a cracking catalyst comprising a zeolite having the structure of ZSM-12 and a large-pore, crystalline zeolite having a Constraint Index less than about 1, the weight ratio of the zeolite having the structure of ZSM-12 to the large-pore crystalline zeolite component being in the range of from about 1:10 to about 7:10.
Dependencies are inferred from the claim text.