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 307/89 (2006.01) C07C 51/567 (2006.01) C07C 51/573 (2006.01)

Patent

CA 1173847

RD-13037 METHOD FOR MAKING AROMATIC BIS(ETHER ANHYDRIDES) Abstract of the Disclosure A method is provided for making aromatic bis(ether phthalic anhydride)s by effecting an imide- anhydride exchange between aromatic bis(ether N- organophthalimide) and phthalic anhydride in the presence of an imide anhydride exchange catalyst and water and extracting the aqueous imide-anhydride exchange reaction mixture with an inert organic solvent. Imide-anhydride exchange product having at least 97 mole percent aromatic bis(ether phthalic anhydride) can be made at substan- tially reduced temperatures and pressures, by increasing by a factor of at least two, the number of times the imide-anhydride exchange mixture is extracted.

398904

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