Process for working up crude liquid vinyl acetate

Details Process for working up crude liquid vinyl acetate Process for working up crude liquid vinyl acetate

1985-06-28

1990-06-19

Bascomb, Wilbur

Distillation: processes, separatory

Including addition of water or steam

To distillation column

203 97, 203DIG10, 203DIG19, 560248, B01D 336, C07C 6754

Patent

active

049345192

ABSTRACT:
An improved process for working-up crude liquid vinyl acetate which contains vinyl acetate, acetic acid, water, and ethyl acetate, possibly together with small amounts of other impurities, by distillation is disclosed, wherein a mixture essentially containing vinyl acetate and water is obtained as the top product and essentially acetic acid is obtained as the bottom product, and a sidestream, in which ethyl acetate is concentrated is removed. According to the process the top product is condensed and, after phase separation, a portion of the vinyl acetate phase is recycled as reflux into the distillation. The improved process involves the introduction of water above the point of introduction of the crude vinyl acetate. Preferably, the water is introduced in an amount which is not greater than the amount required to achieve a maximum water content in the vapors leaving the distillation at the top.

REFERENCES:
patent: 2681306 (1954-06-01), Kemp et al.
patent: 3182006 (1965-05-01), Fruhwirth
patent: 3404177 (1968-10-01), Baba et al.
patent: 3458406 (1969-07-01), Fisher et al.
patent: 3692636 (1972-09-01), Huguet
patent: 3905875 (1965-09-01), Kronig et al.
patent: 4229261 (1980-10-01), Heck et al.
patent: 4438870 (1969-04-01), Roscher et al.
Horsely; Azeotropic Data II, Advances in Chemistry Series 116, (AMCS, 1973), p. 20.

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