Method for making aromatic bis(ether dicarboxylic acid)s

Details Method for making aromatic bis(ether dicarboxylic acid)s Method for making aromatic bis(ether dicarboxylic acid)s

1975-06-27

1977-10-18

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260326A, 2603463, C07C 5106

Patent

active

040546004

ABSTRACT:
A method is provided for making aromatic bis(ether dicarboxylic acid)s, such as 2,2-bis[4(3,4-dicarboxyphenoxy)phenyl] propane. The corresponding aromatic bis(etherimide) is hydrolyzed in base to produce a tetraacid salt which is directly acidified with concentrated mineral acid such as sulfuric acid. The resulting aqueous mixture containing a paste is heated to produce the aromatic bis(ether dicarboxylic acid) in ready filterable form.

REFERENCES:
patent: 3879428 (1975-04-01), Heath
patent: 3965125 (1976-07-01), Meyers

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