Process for reducing the benzene content of gasoline

摘要

In a process for alkylating benzene contained in a benzene-containing refinery gasoline stream, the benzene-containing refinery gasoline stream is contacted with an alkylating agent selected from one or more C2 to C5 olefins in at least one alkylation reaction zone under alkylation conditions to produce an alkylated effluent which has reduced benzene content as compared with said refinery gasoline stream and is essentially free of said alkylating agent. An aliquot of the alkylated effluent is then recycled to the one at least one alkylation reaction zone such that the molar ratio of alkylatable aromatic compounds to said alkylating agent in the combined refinery gasoline and recycle streams introduced into the at least one alkylation reaction zone is at least 1.0:1.

主权项

1. A process for reducing the benzene content of gasoline by alkylating benzene contained in a benzene-containing refinery gasoline stream, said process comprising contacting said benzene-containing refinery gasoline stream with an alkylating agent selected from one or more C2 to C5 olefins in at least one alkylation reaction zone under alkylation conditions to produce an alkylated effluent which has reduced benzene content as compared with said refinery gasoline stream and is essentially free of said alkylating agent, wherein an aliquot of the alkylated effluent is recycled to said one at least one alkylation reaction zone such that the molar ratio of alkylatable aromatic compounds to said alkylating agent in the combined refinery gasoline and recycle streams introduced into said at least one alkylation reaction zone is at least 1.0:1, and wherein the molar ratio of alkylatable aromatic compounds in said benzene-containing refinery gasoline stream to said alkylating agent introduced into said at least one alkylation reaction zone is about 0.1:1 to about 1.0:1.