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US 8,471,084 B2Granted
Process for increasing weight of olefins
AssigneeUop LLC
InventorsJoao Jorge da Silva Ferreira Alves, James E. Rekoske, Christopher P. Nicholas
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Abstract
The process converts FCC olefins to heavier compounds. The heavier compounds are more easily separated from the unconverted paraffins. The heavier compounds can be recycled to an FCC unit or delivered to a separate FCC unit. Suitable conversion zones are oligomerization and aromatic alkylation zones.
Claims4
A process for converting olefins to larger compounds comprising:
- contacting cracking catalyst with a hydrocarbon feed stream to crack hydrocarbons to cracked product hydrocarbons having lower molecular weight and deposit coke on the cracking catalyst to provide coked cracking catalyst;
- separating said coked cracking catalyst from said cracked products;
- combusting coke on said coked cracking catalyst with oxygen to regenerate said cracking catalyst;
- separating said cracked products in a main fractionation column;
- compressing at least a portion of an overhead stream from said main fractionation column to provide a compressed overhead stream;
- separating a liquid stream from said compressed overhead stream;
- depropanizing at least a portion of said liquid stream to provide a stream of C4-C7 olefins and paraffins;
- passing said stream of C4-C7 olefins and paraffins to a conversion zone to convert the C4-C7 olefins to larger molecular weight C4-C7-derived compounds;
- and
- feeding said C4-C7-derived compounds to an FCC reactor.
7 more elements
Dependencies are inferred from the claim text.