Recovery of HF from an alkylation unit acid stream containing ac

Distillation: processes – separatory – With disparate physical separation

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203 70, 203DIG14, 203DIG25, 423483, B01D 334, C01B 707, C01B 719

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active

041994094

ABSTRACT:
A method and apparatus for recovering HF catalyst from an alkylation unit acid stream containing acid soluble oil wherein a bottoms stream, which contains HF, acid soluble oils and a minor quantity of water, from an HF rerun column are processed. The bottoms mixture is cooled in a heat exchanger to a temperature sufficiently low so as to effect separation of HF from the acid soluble oil with the mixture then being passed to a separating vessel to allow the separation of the HF from the acid soluble oil due to the reduced mutual solubility. A gradient of HF concentration is effected within the separation vessel wherein an HF-rich acid soluble oil mixture is withdrawn as a stream separate from a substantially HF-free acid soluble oil portion which is also recovered as a separate stream.

REFERENCES:
patent: 2551881 (1951-05-01), Hachmuth
patent: 2574006 (1951-11-01), Allen
patent: 2614132 (1952-10-01), Lee et al.
patent: 3551515 (1970-12-01), Gentry
patent: 3721720 (1973-03-01), Chapman et al.
patent: 3726940 (1973-04-01), Cannady et al.
patent: 3793394 (1974-02-01), Chapman

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