Method for making aromatic bis(ether anhydrides)

Details Method for making aromatic bis(ether anhydrides) Method for making aromatic bis(ether anhydrides)

C - Chemistry, Metallurgy

07

D

260/364.8

C07D 307/00 (2006.01) C07C 51/567 (2006.01) C07C 51/573 (2006.01)

Patent

CA 1173844

RD-13035 METHOD FOR MAKING AROMATIC BIS(ETHER ANHYDRIDES) Abstract of the Disclosure A method is provided for controlling the build-up in concentration of triorganoamine exchange catalyst in an organic extraction solvent used in the extraction of aromatic bis(ether phthalimide) and N- organo substituted phthalimide from an imide-anhydride exchange reaction mixture. The concentration of the triorganoamine exchange catalyst is controlled in the extracting organic solvent by extracting the organic sol- vent with an aqueous mixture of phthalic acid and trior- ganoamine and thereafter recycling the organic solvent to the extractor.

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