Purification of acetic acid

Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material

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203 33, 203 41, 203 51, 203 53, 203 61, 204 97, 260541, B01D 334

Patent

active

040615464

ABSTRACT:
Formic acid is removed from acetic acid substantially free of halide impurities but containing small amounts of formic acid by contacting the acid with a compound of hexavalent chromium and recovering the purified acid from the resulting mixture by distillation, ion-exchange, or the like. In a preferred embodiment, the acid to be purified is distilled in the presence of a solution of the hexavalent chromium compound, the purified acid being obtained as the overhead product while the bottoms stream contains the reduced chromium compound. With the preferred chromium trioxide as treating agent, this compound can be recovered for re-use by adding a strong mineral acid to the bottoms stream from the distillation, electrolytically oxidizing the chromium compound contained therein, and separating chromium trioxide from the strong mineral acid solution.

REFERENCES:
patent: 2149765 (1939-03-01), Goos et al.
patent: 2255421 (1941-09-01), Groll et al.
patent: 2278831 (1942-04-01), Cockerille
patent: 3439026 (1969-04-01), Patton et al.

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