Separation process

Details Separation process Separation process

1992-12-07

1993-08-31

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 12, 203 79, 203 80, 203 85, 562605, 568411, B01D 314, B01D 334

Patent

active

052405664

ABSTRACT:
A process for separating acetone, dichloromethane and trifluoroacetic acid from a mixture of acetone, dichloromethane, and a trifluoroacetic acid/acetone azeotrope
by (1) fractionally distilling the mixture of acetone, dichloromethane, and the trifluoroacetic acid/acetone azeotrope;
(2) fractionally distilling the mixture of the trifluoroacetic acid/acetone azeotrope and free acetone;
(3) adding at least about 16 parts of water to the trifluoroacetic acid/acetone azeotrope per 100 parts by volume of the trifluoroacetic acid/acetone azeotrope;
(4) fractionally distilling the mixture of free acetone and the water/trifluoroacetic acid azeotrope;
(5) adding at least about 10 parts of sulfuric acid to the water/trifluoroacetic acid azeotrope per 100 parts by volume of the water/trifluoroacetic acid azeotrope;
(6) fractionally distilling the mixture of trifluoroacetic acid and the water/sulfuric acid complex.

REFERENCES:
patent: 2381032 (1945-08-01), Bludworth et al.
patent: 4213832 (1980-07-01), Zudkevitch et al.
patent: 4609497 (1986-09-01), Cope
patent: 4730082 (1988-03-01), Amiet
patent: 4879407 (1989-11-01), Amiet

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