DONALD L PHIPPS
Engineering in Pittsfield, MA
License number
Massachusetts 31198
Issued Date
Jan 28, 1983
Expiration Date
Jun 30, 2008
Type
Chemical Engineer
Address
Address
Pittsfield, MA 01201
Professional information
Method For Making Aromatic Bis (Ether Anhydrides)
US Patent:
4318857, Mar 9, 1982
Filed:
Apr 3, 1981
Appl. No.:
6/251019
Inventors:
Jimmy L. Webb - Ballston Lake NY
Donald L. Phipps - Pittsfield MA
Donald L. Phipps - Pittsfield MA
Assignee:
General Electric Company - Schenectady NY
International Classification:
C07D30783
US Classification:
2603463
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.