Method for making aromatic bis(ether phthalic acid) or aromatic

Details Method for making aromatic bis(ether phthalic acid) or aromatic Method for making aromatic bis(ether phthalic acid) or aromatic

1981-04-03

1982-05-11

Jiles, Henry R.

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

Organic compounds

Carboxylic acids and salts thereof

562429, 562432, 562460, 562469, 562473, 549241, C07D30789, C07C 6524

Patent

active

043294960

ABSTRACT:
A method is provided for converting aromatic bis(ether N-organo substituted phthalimides) to aromatic bis(ether anhydrides) by heating a bisphasic aqueous-organic mixture of aromatic bis(ether N-organo substituted phthalimide), phthalic anhydride and an exchange catalyst to effect an imide-anhydride exchange producing an aqueous phase containing aromatic bis 4ether phthalic acid) and an organic phase containing N-organo substituted phthalimide. The aromatic bis(ether phthalic acid) is then optionally dehydrated to the corresponding anhydride.

REFERENCES:
patent: 3931243 (1976-01-01), Paustian et al.
patent: 4116980 (1978-09-01), Webb

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