Dehydration of formic acid by extractive distillation

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

1988-01-04

1988-11-22

Bascomb, Wilbur

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 51, 203 56, 203 58, 203 60, 203 61, 203 62, 203 65, 562609, B01D 340, C07D 5302

Patent

active

047863706

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 ethylene carbonate or propylene carbonate, either alone or mixed with certain high boiling organic compounds. Examples of effective agents are ethylene carbonate and heptanoic acid; propylene carbonate, benzoic acid and isophorone; propylene carbonate, heptanoic acid and 2-hydroxyacetophenone.

REFERENCES:
patent: 2437519 (1948-03-01), Guinot et al.
patent: 2439777 (1948-04-01), Lake et al.
patent: 2801265 (1957-07-01), Coutor
patent: 3018228 (1962-01-01), Cornell
patent: 4444881 (1984-04-01), Urbas
patent: 4549938 (1985-10-01), Berg et al.
patent: 4642166 (1987-02-01), Berg et al.
patent: 4735690 (1988-04-01), Berg et al.

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