| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for safely producing a solution containing tetrafluoro(oxalato)phosphate, the solution having few chlorine compounds or free acids, such that crystallization and purification are not required in later steps.SOLUTION: There is provided a method for producing a tetrafluoro(oxalato)phosphate solution by mixing hexafluorophosphate and oxalic acid in a nonaqueous solvent, and then causing a reaction by adding silicon tetrachloride to the mixture. The ratio at which the hexafluorophosphate, oxalic acid and silicon tetrachloride are added is set at a molar quantity of 1.90 or more of hexafluorophosphate and a molar quantity of 1.90 to 2.10 of oxalic acid with respect to a molar quantity of 1 of the silicon tetrachloride. |
