Process for the isolation of vinyl acetate

Details Process for the isolation of vinyl acetate Process for the isolation of vinyl acetate

1987-12-10

1989-04-04

Schor, Kenneth M.

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid sorption of component from gas or vapor

203 78, 203 80, 203 99, 203DIG9, 203DIG10, 203DIG19, 560248, B01D 300, C07C 6748

Patent

active

048183474

ABSTRACT:
The invention relates to a process for the isolation of vinyl acetate from a gas mixture containing vinyl acetate, ethyl acetate, water and carbon dioxide formed in the reaction of ethylene with acetic acid and oxygen in the gas phase over catalysts containing palladium or palladium compounds. The gas mixture leaving the reaction zone is passed into a distillation column and the gas mixture leaving the top thereof is cooled. The gas which is not condensed during the cooling is washed with acetic acid in a washing column, an acetic acid solution containing vinyl acetate being obtained. The bottom product from the distillation column is passed to a second distillation column and a side stream containing ethyl acetate is removed from an enrichment zone above the bottom thereof, all or some of the bottom product from the second distillation column, which product chiefly consists of acetic acid, being used for the wash in the washing column. The top vapor of the second distillation column is cooled. A portion of the organic phase of the condensate thereby formed is passed, together with the acetic acid solution obtained as the bottom product in the washing column, into a third distillation column, which may have an intermediate tray. The bottom product of the third distillation column is passed into a fourth distillation column. Pure vinyl acetate is removed at the top of the fourth distillation column.

REFERENCES:
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patent: 3404177 (1968-10-01), Baba et al.
patent: 3438870 (1969-04-01), Roscher et al.
patent: 3458406 (1969-07-01), Fisher et al.
patent: 3591463 (1971-07-01), Copelin
patent: 3692636 (1972-09-01), Huguet
patent: 3738915 (1973-06-01), Di Fiore et al.
patent: 3838019 (1974-09-01), Schwerdtel et al.
patent: 3905875 (1975-09-01), Kronig et al.
patent: 4156632 (1979-05-01), Roscher et al.

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