SOLVATE D'HEXAFLUOROPHOSPHATE DE LITHIUM ET DE PYRIDINE, SA PREPARATION ET PROCEDE DE PREPARATION D'HEXAFLUOROPHOSPHATE DE LITHIUM UTILISANT CE SOLVATE

摘要

The invention concerns a lithium hexafluorophosphate solvate for preparing lithium hexafluorophosphate of high purity. This lithium and pyridine hexafluorophosphate is of formula: Li(C5H5N)PF6 and it is prepared by a method comprising the following steps: a) preparing pyridinium hexafluorophosphate of formula C5H5NHPF6 by neutralisation of hexafluorophosphoric acid HPF6 with pyridine, and b) converting pyridinium hexafluorophosphate in solvate LiPF6, C5H5N by exchange with one lithium compound selected among lithium hydroxide, lithium alcoholates and alkyl-lithium. LiPF6 can be regenerated from the solvate by decomposition under vacuum.