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

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

C - Chemistry, Metallurgy

07

C

260/509.7, 260/3

C07C 65/24 (2006.01) C07C 51/567 (2006.01) C07D 307/89 (2006.01)

Patent

CA 1173843

Abstract of the Disclosure 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(ether 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.

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