Process for the recovery of five-membered ring dicarboxylic acid

Details Process for the recovery of five-membered ring dicarboxylic acid Process for the recovery of five-membered ring dicarboxylic acid

1984-08-31

1985-12-31

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549233, 549247, 549250, 549251, 549255, 549262, C07D30760, C07D30789

Patent

active

045622647

ABSTRACT:
A process for the recovery of five-membered ring dicarboxylic acid anhydrides from aqueous solutions of the corresponding dicarboxylic acids which entails (a) washing the aqueous solution of the dicarboxylic acid with a water-insoluble tertiary amine, and separating the resulting amine-acid salt from the water layer; and (b) adding an aromatic hydrocarbon entrainer for the water, removing the entrainer/water azeotrope by distillation and separating the five-membered ring dicarboxylic acid anhydride after phase separation; or adding an aliphatic hydrocarbon entrainer for the water, removing a ternary azeotropic mixture consisting of a hydrolytically stable anhydride, water and entrainer by distillation and separating the five-membered ring dicarboxylic acid anhydride after phase separation.

REFERENCES:
patent: 3833619 (1974-09-01), Baumann et al.
patent: 3931243 (1976-01-01), Paustian et al.

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