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AssigneeGeneral Electric Company
InventorsRobert E. Greenwell, Thomas Link Guggenheim, Norman Enoch Johnson, Roy Ray Odle, Jimmy Lynn Webb
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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.
A process for recovering metal nitrite from a reaction mixture, comprising the steps of:
A process for recovering metal nitrite from a reaction mixture, comprising the steps of:
A process for recovering metal nitrite from a reaction mixture, comprising the steps of:
A process for reducing the yield loss of a bisimide from a polyimide reaction mixture by washing the polyimide reaction mixture with a polar solvent before washing the polyimide reaction mixture with caustic.
Dependencies are inferred from the claim text.