Process for the treatment of quaternary onium salts and its appl

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

1992-05-11

1994-01-04

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564291, 564296, 568 9, 568 11, C07C21163, C07F 954

Patent

active

052761894

ABSTRACT:
A process for the treatment of a quaternary onium salt is described. The process comprises the steps of (i) contacting an organic phase soaringly miscible in water containing a quaternary onium fluorine-containing carboxylate of RfCO.sub.2.sup.-+ AR.sup.1 R.sup.2 R.sup.3 R.sup.4 as defined in the present Specification with an aqueous phase containing a thiocyanate 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.

REFERENCES:
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patent: 3660354 (1972-05-01), Uelzmann
patent: 4623487 (1986-11-01), Cope
"Phase Transfer Catalysis, Principles and Techniques", Starks et al, p. 8, Academic Press (1978).
Kinetics of the Reaction of Cyclohexyl Bromide with Tetra-n-propylammonium Thophenoxide in Methanol, Dimethylformamide, and Molten Triethyl-n-hexylammonium Triethyl-n-hexylboride, W. T. Ford, et al, Journal of American Chemical Society, 95, 7381 (1973).
CA 106:33957c, Recovery of Fluro surfactants, Cope, C. S., p. 37, 1987.

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