Dehydration of impure formic acid by extractive distillation

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

1986-04-28

1988-04-05

Bascomb, Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 15, 203 56, 203 57, 203 58, 203 60, 203 61, 203 62, 203 63, 203 65, 562609, B01D 340, C07C 5302

Patent

active

047356901

ABSTRACT:
Impure formic acid cannot be completely removed from formic acid-water-impurity mixtures by distillation because of the presence of the maximum azeotrope between formic acid and water. Formic acid can be readily removed from mixtures containing it, water and impurities of the ether, ester, ketone or diketone type by using extractive distillation in which the extractive agent is a higher boiling oxygenated, nitrogenous or sulfur containing organic compound or a mixture of these. Examples of effective agents are adiponitrile; sulfolane and salicyclic acid; dimethylformamide, N,N-dimethylacetamide and ethylene glycol ethyl ether acetate.

REFERENCES:
patent: 3951755 (1976-04-01), Sartorius et al.
patent: 4024028 (1977-05-01), Haskell
patent: 4076594 (1978-02-01), Buelow et al.
patent: 4217460 (1980-08-01), Hohenschutz et al.
patent: 4262140 (1981-04-01), Bott et al.
patent: 4576683 (1986-03-01), Cohen

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