Process for the purification of diaminodiphenyl compounds

Details Process for the purification of diaminodiphenyl compounds Process for the purification of diaminodiphenyl compounds

1992-06-11

1994-08-23

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 37, 203 91, 564437, B01D 310, B01D 334

Patent

active

053404459

ABSTRACT:
Diaminodiphenyl-compounds of the structure selected from: ##STR1## wherein R.sub.1 and R.sub.2 can be: H, --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7, --C.sub.4 H.sub.9 or ##STR2## Y can be: C(CH.sub.3).sub.2, ##STR3## n=0; 1. are purified by distilling the crude product obtained under vacuum in one step, in the presence of one or more alkaline bases.

REFERENCES:
patent: 4189354 (1980-02-01), Ellendt et al.
patent: 4404063 (1983-09-01), Honda
patent: 4454347 (1984-06-01), Parham et al.
patent: 4700011 (1987-10-01), Pillsbury
patent: 4825002 (1989-04-01), Davis
patent: 5019653 (1991-05-01), Speranza et al.
Patent Abstracts of Japan 14, No. 37 (C-680) 1989 Mitsui Petrochem Ind. Ltd.
Patent Abstracts of Japan 11, No. 60 (C-405) 1985 Mitsui Toatsu Chem. Inc.

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