Patent ID: 7772435

Claim:
A method of forming quaternary ammonium salt mixture, comprising: (a) adding an aqueous solution comprising a quaternary ammonium salt to an organic solvent in a vessel under an inert atmosphere, thereby forming a first mixture comprising the quaternary ammonium salt and the solvent; and (b) mixing the first mixture at a temperature and for a time sufficient to remove water and a portion of the solvent from the first mixture, wherein the mixing is performed in an inert atmosphere and the temperature is less than the decomposition temperature of the quaternary ammonium salt, and wherein the quaternary ammonium salt is selected from the group consisting of guanidinium salts, bis-guanidinium alkane salts, dialkylaminopyridinium salts, bis-dialkylaminopyridinium salts, dialkylpiperidinium salts, bis-alkyl quaternary ammonium salts, and combinations of two or more of the foregoing.