Process for the purification of crude acetic anhydride

Details Process for the purification of crude acetic anhydride Process for the purification of crude acetic anhydride

1976-02-02

1978-08-15

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203DIG19, 260546, 202155, B01D 100, B01D 314, C07C 5312

Patent

active

041070020

ABSTRACT:
A process for the purification of crude acetic anhydride by continuous fractional distillation, which comprises first introducing the anhydride into an evaporator, thereafter removing from the evaporator the non-distillable components contained in the crude anhydride, then introducing the distillable components of the anhydride in vapor form into about the central section of a fractionating column, withdrawing from the top of the column the low boiling components together with acetic acid, withdrawing near the bottom of the column a high-percentage of pure acetic anhydride, and separating from the sump of the column up to about 8% by weight based on the initial amount of crude acetic anhydride and returning the same to the evaporator.

REFERENCES:
patent: 2159146 (1939-05-01), Guinot
patent: 2504195 (1950-04-01), Hall et al.
patent: 2670355 (1954-02-01), Barsky et al.
patent: 2688635 (1954-09-01), Eberts et al.
patent: 2703309 (1955-03-01), Painter
patent: 2895886 (1959-07-01), Schneider
patent: 3392091 (1968-07-01), Hohenschutz
patent: 3644179 (1972-02-01), Knoer et al.

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