Recovery of hexane from recycle streams from ethylene polymeriza

Details Recovery of hexane from recycle streams from ethylene polymeriza Recovery of hexane from recycle streams from ethylene polymeriza

1974-09-05

1976-04-27

Lutter, Frank W.

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 94, 526 68, 526 70, 526330, 526352, B01D 300, B01D 310

Patent

active

039533018

ABSTRACT:
A process is provided for recovering hexane from the mixed recycle stream from a plurality of ethylene polymerization reactors. The recycle stream containing hexane and periodically vinyl acetate and/or an alkyl acrylate admixed with vinyl acetate to provide a mixed feed stream containing at least 45% by weight vinyl acetate. This feed stream is distilled at atmospheric pressure and all of the hexane is recovered as an overhead azeotrope containing about 57% hexane. The overhead fraction is redistilled at a superatmospheric pressure of at least 4 atmospheres in a second column. The overhead fraction of the second column will be enriched in vinyl acetate and pure hexane is recovered as a bottoms fraction from the second column. The vinyl acetate and/or alkyl acrylate contained in the bottoms fraction of the first column is recovered by atmospheric distillation in a third column.

REFERENCES:
patent: 3182006 (1965-05-01), Fruhwirth
patent: 3277158 (1966-10-01), Schaffer
patent: 3324090 (1967-06-01), Ross et al.
patent: 3394057 (1968-07-01), Miller et al.

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