Process for the treatment of quaternary onium salts and its...

Details Process for the treatment of quaternary onium salts and its... Process for the treatment of quaternary onium salts and its...

C - Chemistry, Metallurgy

07

F

260/371, 260/593

C07F 9/54 (2006.01) C07C 209/00 (2006.01) C07C 211/63 (2006.01) C07D 303/08 (2006.01) C07D 303/48 (2006.01)

Patent

CA 2001344

A process for the treatment of a quaternary onium salt is described. The process comprises the steps of (i) contacting an organic phase sparingly miscible in water containing a quaternary onium fluorine-containing carboxylate of RfCO2 -+ AR1R2R3R4 as defined in the present Specification with an aqueous phase containing a thio- cyanate ion to form a quaternary onium thiocyanate in the organic phase and (ii) contacting the organic phase containing the quaternary onium thiocyanate with an aqueous solution containing a water-soluble oxidizing agent to decompose the thiocyanate ion and to form an easily ion exchangeable quaternary onium salt. Also, applications of this treatment to a process for preparing hexafluoropropylene oxide from hexafluoropropylene in a two-phase system of an aqueous phase and an organic phase by using a hypochlorite as an oxidizing agent in the presence of a quaternary onium salt as a catalyst are described.

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