Dehydration of formic acid by extractive distillation

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

1989-01-17

1991-04-09

Bascomb, Wilbur

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 51, 203 57, 203 60, 203 61, 562609, B01D 340, C07C 5144, C07C 5302

Patent

active

050062050

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 mono carboxylic acid mixed with certain high boiling organic compounds. Examples of effective agents are: hexanoic acid and butyl benzoate; octanoic acid and nitrobenzene; heptanoic acid, benzyl benzoate and pelargonic acid.

REFERENCES:
patent: 1848664 (1932-03-01), Rohde
patent: 2588268 (1952-03-01), Mercer et al.
patent: 3357899 (1967-12-01), Robeson
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

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