Patent ID: 7459578

Claim:
A process for the preparation of an alk(en)ylphosphoric ester salt of the-formula (I) or of the formula (II) or mixtures thereof wherein n is 1,2, or 3, R 1 and R 2 are identical or different and, independently of one another, are a linear or branched alkyl radical having 1 to 30 carbon atoms or are a linear or branched alkenyl radical having 2 to 30 carbon atoms and X n+ is a cation with the valence n, comprising the step of reacting an alk(en)ylphosphoric ester of the formula (III) or of the formula (IV) or mixtures thereof wherein R 1 and R 2 have the meaning given above, with a base in an aprotic solvent or aprotic solvent mixture, wherein the aprotic solvent or the aprotic solvent mixture is chosen from aliphatic hydrocarbons, cyclic hydrocarbons, aromatic solvents and mixtures of said solvents, and wherein the cation X n+ comes from the base.