Robert J Greenwell

US Patent:

62513540, Jun 26, 2001

Filed:

Apr 2, 1999

Appl. No.:

9/285927

Inventors:

Robert E. Greenwell - Mount Vernon IN
Thomas Link Guggenheim - Mt. Vernon IN
Norman Enoch Johnson - Mount Vernon IN
Roy Ray Odle - Mt. Vernon IN
Jimmy Lynn Webb - Ballston Lake NY

Assignee:

General Electric Co. - Pittsfield MA

International Classification:

C01B 2120
C07D40500

US Classification:

423385

Abstract:

The present invention provides a process for recovering a metal nitrite, e. g. , sodium nitrite, from a reaction mixture formed from an aromatic displacement reaction such as the synthesis of an aromatic bis(ether phthalimide) in an organic non-polar solvent. The process comprises forming a reaction mixture from the synthesis of an aromatic bis(ether phthalimide) comprising a recoverable amount of metal nitrite; treating the reaction mixture with an amount of water effective to produce an aqueous solution phase of metal nitrite and an organic non-polar phase; and separating the aqueous solution phase of metal nitrite from the organic non-polar phase.