Patent ID: 6630605
Filing Date: 2003-10-07
Classification: C07F

Abstract:
A process for the purification of phosphonium salts for the formulaRâ€”PâŠ•Râ€²3X&ominus;in which R is a hydrogen radical with 5 to 40 carbon atoms, R1 is C1-C4-alkyl or C6-C10-aryl and X is an equivalent of and anion, in whicha) a solution of the crude phosphonium salt is passed over a bed of a cation exchange resin in salt form, b) the cation exchange resin is washed with at least one polar protic or aprotic and/or at least one nonpolar solvent, and c) the phosphonium salt is eluted form the cation exchange resin with an electrolyte solution, optionally in combination with a polar aprotic solvent.