Method for making aromatic bis (ether anhydrides)

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

1981-04-03

1982-03-09

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30783

Patent

active

043188575

ABSTRACT:
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 solvent with an aqueous mixture of phthalic acid and triorganoamine and thereafter recycling the organic solvent to the extractor.

REFERENCES:
patent: 4116980 (1978-09-01), Webb
patent: 4128574 (1978-12-01), Markezich et al.

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