Method for purifying acetic acid

Details Method for purifying acetic acid Method for purifying acetic acid

1976-12-28

1981-05-19

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With chemical reaction

203 71, 203DIG19, 562608, B01D 300, C07C 5144

Patent

active

042683629

ABSTRACT:
A method for purifying raw acetic acid containing formaldehyde is provided wherein raw acetic acid is heat-treated at a temperature of about its boiling point or higher, in advance of the conventional distillation for removing a lower boiling fraction, and the acetic acid thus heat-treated is distilled to remove the lower boiling fraction, whereby the content of formaldehyde can be reduced down to 30 ppm or lower.

REFERENCES:
patent: 2186617 (1940-01-01), Othmer
patent: 3838018 (1974-09-01), Gehrmann et al.

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