Purification of acetic anhydride or acetic anhydride and acetic

Details Purification of acetic anhydride or acetic anhydride and acetic Purification of acetic anhydride or acetic anhydride and acetic

1993-07-06

1994-11-08

Bascomb, Jr., Wilbur

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 98, 203DIG19, 562519, 562608, 562891, 562898, B01D 334, C07C 5142, C07C 51573

Patent

active

053623657

ABSTRACT:
Acetic acid and/or acetic anhydride containing methyl crotonate, vinyl acetate, or both as impurities, is contacted with ozone in an amount of excess molar to the carbon-carbon double bond in said methyl crotonate and/or vinyl acetate and the impurities produced by ozone-treatment are removed off by distillation. A large quantity of impurities such as aldehydes are produced after treatment by treating acetic acid and/or acetic anhydride containing much amount of unsaturated compounds as impurities with ozone. Distilling the ozone-treated acetic acid and/or acetic anhydride make it possible to remove methyl crotonate and vinyl acetate, which are unsaturated compounds difficult to remove by the conventional separation methods, to give high-quality acetic acid and/or acetic anhydride excellent in the residence time in the potassium permanganate test.

REFERENCES:
patent: 2255421 (1941-09-01), Groll et al.
patent: 2278831 (1942-04-01), Cockerille
patent: 2893923 (1959-07-01), Luke et al.
patent: 3928434 (1975-12-01), Saunby
patent: 4664753 (1987-05-01), Erpenbach et al.
patent: 5155265 (1992-10-01), Scates et al.
patent: 5155266 (1992-10-01), Scates et al.
patent: 5202481 (1993-04-01), Scates et al.

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