Process for purifying bis(fluoro sulfonyl)imide salts

Abstract

A method for purifying a composition comprising a salt of bis(fluoro sulfonyl)imide in the form of a solution, wherein the method comprises the steps of: (I) providing a composition comprising at least one solvent, water in an amount of at least 100 ppm, and at least one salt of bis(fluoro sulfonyl)imide in a first concentration (salt-FSI 1); (II) charging the composition (COMP) into a vessel; (III) subjecting the composition (COMP) to distillation; and (IV) recovering a composition comprising at least one organic solvent, water in an amount lower than 100 ppm, and the at least one salt-FSI in a second concentration (salt-FSI 2), wherein the second concentration (salt-FSI 2) is higher than the first concentration (salt-FSI 1) in the composition (COMP).

Dependencies are inferred from the claim text.