Azeotropic distillation of hydroxyacetic acid

Details Azeotropic distillation of hydroxyacetic acid Azeotropic distillation of hydroxyacetic acid

1982-04-12

1984-02-14

Sever, Frank

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

562518, 562580, B01D 336

Patent

active

044314868

ABSTRACT:
The yield of hydroxyacetic acid produced from formaldehyde, water and carbon monoxide in the presence of a sulfuric acid catalyst and using crude recycled hydroxyacetic acid as the reaction medium is improved by azeotropic distillation of crude, recycle hydroxyacetic acid with toluene. The distillation step reduces the water content of feed thereby increases conversion of formaldehyde to hydroxyacetic acid and reduces formic acid content in the product.

REFERENCES:
patent: 2152852 (1939-04-01), Loder
patent: 2153064 (1939-04-01), Larson
patent: 2265945 (1941-12-01), Loder
patent: 2334524 (1943-11-01), Wenker
patent: 2443482 (1948-06-01), Stattuck

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