Process for the preparation of oxydiphthalic acid and purified o

Details Process for the preparation of oxydiphthalic acid and purified o Process for the preparation of oxydiphthalic acid and purified o

1991-10-25

1992-09-08

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549236, 549239, 549241, 549247, C07D30789, C07D30777

Patent

active

051459710

ABSTRACT:
A process for the preparation of purified oxydiphthalic acid from impure oxydiphthalic anhydride, by treating with a mixture of water and propionic acid or butyric acid to produce oxydiphthalic acid. The acid may be treated to reform oxydiphthalic anhydride. The most effective composition range for the acid-water mixture is from about 25% acid to 75% acid.

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