Patent Number: 6,251,354

Title: Process for recovering sodium nitrite

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.

Inventors: Greenwell; Robert E. (Mount Vernon, IN), Guggenheim; Thomas Link (Mt. Vernon, IN), Johnson; Norman Enoch (Mount Vernon, IN), Odle; Roy Ray (Mt. Vernon, IN), Webb; Jimmy Lynn (Ballston Lake, NY)

Assignee: General Electric Co.

International Classification: C01B 21/00 (20060101); C01B 21/50 (20060101); C01B 021/20 (); C07D 405/00 ()

Expiration Date: 06/26/2018