Catalytic cracking using a metals scavenging composition
AssigneeUnion Oil Company of California
InventorMario L. Occelli
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Abstract
A metals scavenging composition comprising a rare earth component and a layered magnesium silicate, such as sepiolite or attapulgite, is mixed with separate particles of a cracking catalyst and the mixture used to crack hydrocarbon feedstocks containing relatively high concentrations of vanadium and other contaminant metals. The use of the metals scavenger prolongs the life of the catalyst while maintaining (1) relatively high conversions and gasoline yields, and (2) relatively low hydrogen and coke makes.
Claims28
A process for the catalytic cracking of a metals-containing hydrocarbon feestock which comprises contacting said feedstock with a mixture of a cracking catalyst and separate particles of a metals scavenger under cracking conditions in the substantial absence of added molecular hydrogen in a cracking zone to convert components of said feedstock into lower molecular weight constituents, wherein said cracking catalyst comprises a molecular sieve having cracking activity dispersed in a matrix and said metals scavenger comprises between about 0.10 and 30 weight percent of one or more rare earth components, calculated as the sum of the respective rare earth oxides, and a layered magnesium silicate.
A process for the catalytic cracking of a metals-containing hydrocarbon feedstock which comprises contacting said feedstock with a mixture of a cracking catalyst and separate particles of a metals scavenger under cracking conditions in the substantial absence of added molecular hydrogen in a cracking zone to convert components of said feedstock into lower molecular weight constituents, wherein said cracking catalyst comprises a molecular sieve having cracking activity dispersed in a matrix and said metals scavenger comprises between about 0.10 and 30 weight percent of one or more rare earth components, calculated as the sum of the respective rare earth oxides, and sepiolite.
Dependencies are inferred from the claim text.