Separation of products of HF alkylation

Details Separation of products of HF alkylation Separation of products of HF alkylation

1979-09-07

1982-01-19

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By condensation of a paraffin molecule with an olefin-acting...

585723, C07C 256, C07C 258

Patent

active

043118666

ABSTRACT:
The reactor effluent hydrocarbon phase from an alkylation zone in which isoparaffin and olefin are contacted in the presence of HF catalyst to form alkylate product is treated by (1) separating a hydrocarbon phase from the reaction effluent; (2) separating the hydrocarbon phase in a first fractionator to produce a bottoms stream containing isoparaffin and alkylate; (3) flashing this bottoms stream to produce a flashed vapor enriched in isoparaffin and a flashed liquid enriched in alkylate; (4) subjecting this flashed liquid to a high pressure, high temperature fractionation in a second fractionator to produce isoparaffin overhead and alkylate from the kettle; and (5) passing the isoparaffin overhead as heat exchange fluid to at least one of (a) the indirect reboiling of the first fractionator kettle, (b) the indirect heating of the bottoms stream being fed from the first fractionator to the flashing step and (c) the indirect heating of the flashed liquid being fed to the second fractionator. In another embodiment, the hydrocarbon phase separated from the reaction effluent is further separated in a first fractionator to produce an overhead stream containing isoparaffin, alkane, HF, and organic fluoride impurities. This overhead stream is condensed and contacted with HF to remove the organic fluorides with the HF containing organic fluorides recycled to the reaction zone.

REFERENCES:
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patent: 2906796 (1959-09-01), Putney
patent: 2910521 (1959-10-01), Cobb
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patent: 3957901 (1976-05-01), Chapman
patent: 4112010 (1978-09-01), Dixon
patent: 4115471 (1978-09-01), Kesler

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