Process for producing highly pure 3,3',4,4'-biphenyltetracarboxy

Details Process for producing highly pure 3,3',4,4'-biphenyltetracarboxy Process for producing highly pure 3,3',4,4'-biphenyltetracarboxy

1990-03-09

1991-09-10

Shen, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562480, 562483, 562485, 562488, C07D30777, C07C 63331

Patent

active

050475606

ABSTRACT:
Highly pure 3,3',4,4'-biphenyltetracarboxylic acid (BPTA) and dianhydride thereof (BPDA) are produced by heating crude BPTA to give BPDA, treating the BPDA with hot water to give highly pure BPTA, and in the case of highly pure BPDA, heat treating the pure BPTA to give highly pure BPDA.

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