Separation of aliphatic diacids from adipic acid admixtures ther

Details Separation of aliphatic diacids from adipic acid admixtures ther Separation of aliphatic diacids from adipic acid admixtures ther

1995-06-14

1996-12-24

Warden, Robert J.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 34, 203 35, 203 48, 562593, B01D 334

Patent

active

055870562

ABSTRACT:
At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is separated from admixtures thereof with adipic acid, by at least partially converting such at least one aliphatic diacid into the corresponding anhydride thereof, and removing the corresponding anhydride or the adipic acid from the medium of conversion/anhydridization, for example by contemporaneous or subsequent distillation, or by crystallization.

REFERENCES:
patent: 3957830 (1976-05-01), Mesch et al.
patent: 4191616 (1980-03-01), Baker
patent: 4230887 (1980-10-01), Mitchell et al.
patent: 5292944 (1994-03-01), Atadan et al.

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