Separation of formic acid from acetic acid by extractive distill

Details Separation of formic acid from acetic acid by extractive distill Separation of formic acid from acetic acid by extractive distill

1989-01-17

1990-03-20

Bascomb, Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 56, 203 58, 203 60, 203 61, 203 62, 203 65, 562608, 562609, B01D 340, C07C 5302

Patent

active

049099078

ABSTRACT:
Formic acid cannot be easily removed from acetic acid by distillation because of the closeness of their vapor pressures. Formic acid can be readily removed from acetic acid by extractive distillation. Typical extractive distillation agents are acetyl salicylic acid and butyl benzoate; acetyl salicylic acid and ethylene carbonate.

REFERENCES:
patent: 3394058 (1968-07-01), Hohenschutz
patent: 3437566 (1969-04-01), Gasser et al.
patent: 3660483 (1972-05-01), Hobbs et al.
patent: 3801629 (1974-04-01), Aga et al.
patent: 4110372 (1978-08-01), Hey et al.
patent: 4576683 (1986-03-01), Cohen
patent: 4692219 (1987-09-01), Berg

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