Benzene reduction in gasoline by alkylation with higher olefins
AssigneeMobil Oil Corporation
InventorsArthur A. Chin, Nick A. Collins, Mohsen N. Harandi, Robert T. Thomson, Robert A. Ware
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Abstract
A benzene-rich gasoline stream is alkylated with higher olefins in contact with a fluid bed of shape selective zeolite catalyst to produce a gasoline product stream reduced in benzene content wherein the high octane value alkylaromatics formed by benzene alkylation are of low carbon number, essentially C10-. Concurrently, a portion of olefins in the gasoline stream are converted to gasoline boiling range hydrocarbons and the sulfur content of the gasoline feedstream is lowered. Besides enhancing the octane value of the feedstream, the process results in a lower Reid vapor pressure and lower sulfur content.
Claims23
A process for alkylating a benzene-rich gasoline boiling range hydrocarbon feedstream with a hydrocarbon stream comprising C.sub.5 + olefins to produce product gasoline having a reduced benzene content and containing aromatics comprising substantially entirely C.sub.10 - alkylated aromatics, said process comprising:
- contacting said benzene-rich stream and said C.sub.5 + olefin stream in a fluidized bed with solid, shape selective aluminosilicate catalyst particles in a catalyst bed under benzene alkylation conditions whereby an effluent stream is produced comprising said gasoline having a reduced benzene content and in which the aromatics which are present are substantially entirely C.sub.10 - alkylated aromatics.
A process for the reduction of the benzene and olefin content of C.sub.5 + FCC gasoline feedstream containing benzene and C.sub.5 + olefins, said process comprising:
- contacting the C.sub.5 + FCC gasoline feedstream with solid, shape selective aluminosilicate catalyst particles in a fluidized catalyst bed under benzene alkylation conditions whereby the benzene in the feedstream is alkylated with the C.sub.5 + olefins of the feedstream to produce an effluent stream comprising said gasoline having a reduced benzene and olefin content in which the aromatics which are present are substantially entirely C.sub.10 - alkylated aromatics.
In the process for reducing the benzene content of a reformate feedstream containing benzene, the process comprising alkylating the reformate feedstream with olefins in a fluidized bed in contact with shape selective metallosilicate catalyst particles, the improvement comprising:
- alkylating said reformate feedstream with higher olefins comprising a C.sub.5 + olefin rich feedstream to alkylate the benzene of the reformate feedstream with the C.sub.5 + olefins whereby an effluent stream is produced comprising said reformate having a reduced benzene content in which the aromatics which are present are substantially entirely C.sub.10 - alkylated aromatics.
A process for lowering the benzene and olefin content of a benzene-rich and C.sub.5 + olefin-rich C.sub.5 + gasoline feedstream comprising:
- contacting said feedstream with solid, shape selective aluminosilicate catalyst particles in a fluidized catalyst bed under benzene alkylation conditions whereby the benzene of the feedstream is alkylatd with C.sub.5 + olefins of the feedstream to produce an effluent stream comprising a gasoline feedstream having a reduced benzene and olefin content relative to the feedstream and in which the aromatics which are present are substantially entirely C.sub.10 - alkylated aromatics.
Dependencies are inferred from the claim text.