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US 9,302,951 B2Granted
Ionic liquid alkylation of 1-butene to produce 2,5-dimethylhexane
AssigneeUop LLC
InventorsCarl J. Stevens, Susie C. Martins, Paul T. Barger
Life of this patent
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Abstract
A process for producing dimethylhexanes (DMH) is provided. The DMH can be used to produce p-xylene. The process involves the alkylation of isobutane and 1-butene using an ionic liquid to produce naphtha that is rich in DMH. The DMH is then converted in high selectivity to xylene, including p-xylene, by dehydrocyclization.
Claims18
A process for producing dimethylhexane comprising:
- introducing a stream comprising isobutane and a stream comprising 1-butene or a stream comprising isobutane and 1-butene to an alkylation reaction zone to form a reaction mixture, the stream comprising 1-butene or the stream comprising isobutane and 1-butene containing less than about 50 wt % total of 2-butene and isobutene;
- and
- alkylating the isobutane and the 1-butene in the alkylation reaction zone in the presence of a haloaluminate ionic liquid catalyst wherein the haloaluminate ionic liquid catalyst comprises a cation selected from one or more of
- where R5, R6, R18-21 are independently selected from C1-C20 hydrocarbons, C1-C20 hydrocarbon derivatives, halogens, and H;
- under alkylation conditions to form a stream rich in dimethylhexane, the stream rich in dimethylhexane having a ratio of dimethylhexane to trimethylpentane of at least about 2:1.
2 more elements
A process for producing xylenes comprising:
- introducing a stream comprising isobutane and a stream comprising 1-butene or a stream comprising isobutane and 1-butene to an alkylation reaction zone to form a reaction mixture, the stream comprising 1-butene or the stream comprising isobutane and 1-butene containing less than about 50 wt % total of 2-butene and isobutene;
- alkylating the isobutane and the 1-butene in the alkylation reaction zone in the presence of a haloaluminate ionic liquid catalyst wherein the haloaluminate ionic liquid catalyst comprises a cation selected from one or more of
- where R5, R6, R18-21 are independently selected from C1-C20 hydrocarbons, C1-C20 hydrocarbon derivatives, halogens, and H;
- under alkylation conditions to form a stream rich in dimethylhexane, the stream rich in dimethylhexane having a ratio of dimethylhexane to trimethylpentane of at least about 2:1;
- and
- dehydrocyclizing the stream rich in dimethylhexane in the presence of a dehydrocyclization catalyst under dehydrocyclization conditions to form a stream rich in xylenes.
3 more elements
Dependencies are inferred from the claim text.