Patent ID: 9593017
Date: 2017-03-14
CPC Classifications: C01B,H01M,Y02E,Y02P

Claim:
1. A process for preparing difluorophosphate comprising reacting difluorophosphoric acid with at least one starting compound selected from the group consisting of, a halide salt, a carbonate, a phosphate, a hydroxide and/or an oxide of an alkali metal, a halide salt, a carbonate, a phosphate, a hydroxide and/or an oxide of an alkaline earth metal, and a halide salt, a carbonate, a phosphate and/or a hydroxide of an onium, in the difluorophosphoric acid, wherein 0.01 to 1 mole of the starting compound is added per mole of the difluorophosphoric acid, and a content of the difluorophosphoric acid in the reaction is in excess of the starting compound, then separating a precipitate from the difluorophosphoric acid by solid-liquid separation, the precipitate being precipitated by a crystallization operation in the difluorophosphoric acid, and removing the difluorophosphoric acid contained in the precipitate by distillation to obtain difluorophosphate.