Dehydration of formic acid by extractive distillation with dicar

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

1989-01-23

1989-10-31

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 64, 562609, B01D 340, C07C 5302

Patent

active

048774901

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 extractive agent is a dicarboxylic acid mixed with certain high boiling organic compounds. Examples of effective agents are: itaconic acid and diethylene glycol diethyl ether; azelaic acid, heptanoic acid and 2-hydroxyacetophenone.

REFERENCES:
patent: 3357899 (1967-12-01), Robeson
patent: 4729818 (1988-03-01), Berg
patent: 4786370 (1988-11-01), Berg

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