Dehydration of formic acid by extractive distillation

Details Dehydration of formic acid by extractive distillation Dehydration of formic acid by extractive distillation

1989-05-30

1990-06-19

Bascomb, Wilbur

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 51, 203 56, 203 60, 203 61, 203 62, 203 63, 203 65, 562609, B01D 340, C07C 5144, C07C 5302

Patent

active

049351001

ABSTRACT:
Formic acid cannot be completely removed from formic acid and water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from formic acid - water mixtures by extractive distillation in which the extractive agent is a benzoic acid derivative mixed with certain higher boiling organic compounds. Examples of effective agents are: o-toluic acid and heptanoic acid; 2-benzoylbenzoic acid and methyl salicylate; p-hydroxybenzoic acid, pelargonic acid and 2-hydroxyacetophenone.

REFERENCES:
patent: 2588268 (1905-03-01), Mercer et al.
patent: 4642166 (1987-02-01), Berg et al.
patent: 4729818 (1988-03-01), Berg
patent: 4735690 (1988-04-01), Berg et al.
patent: 4786370 (1988-11-01), Berg
patent: 4877490 (1989-10-01), Berg et al.

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