Workup of mother liquors resulting from the preparation of adipi

Details Workup of mother liquors resulting from the preparation of adipi Workup of mother liquors resulting from the preparation of adipi

1991-12-30

1993-05-11

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

052102971

ABSTRACT:
A process for working up mother liquors resulting from the preparation of adipic acid by oxidation of cyclohexanol or cyclohexanone or mixtures thereof with nitric acid entails removal of nitric acid by azeotropic distillation with water, heating the resulting melt at from 130.degree. to 180.degree. C. and then dissolving it in water, treating the aqueous solution with cation exchangers, subsequently again evaporating off the water and heating the resulting dicarboxylic acid melt at from 200.degree. to 240.degree. C. and then obtaining a mixture of dicarboxylic acids by distillation.

REFERENCES:
patent: 2719172 (1955-09-01), Nebe
patent: 3106450 (1963-10-01), von den Berg

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