Method for refining acetic anhydride by distillation

Details Method for refining acetic anhydride by distillation Method for refining acetic anhydride by distillation

1992-10-13

1993-11-23

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203DIG19, 562892, 562898, B01D 314, C07C 5312

Patent

active

052640876

ABSTRACT:
Disclosed is a continuous method for refining acetic anhydride produced by the reaction of ketene and acetic acid by means of a vacuum distillation system to provide a refined material comprised of at least 99.5 weight percent acetic anhydride, not more than 0.5 weight percent acetic acid and not more than about 90 parts per million (ppm) diketene.

REFERENCES:
patent: 2159146 (1939-05-01), Guinot
patent: 2232705 (1941-02-01), Hull
patent: 2504195 (1950-04-01), Hall et al.
patent: 2703309 (1955-03-01), Painter
patent: 4107002 (1978-08-01), Eck et al.
patent: 4717454 (1988-01-01), Erpenbach et al.
patent: 5057192 (1991-10-01), Zoeller et al.

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