METHOD OF PRODUCING LITHIUM HEXAFLUOROPHOSPHATE AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2013 - IPC C01B25/455 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Synthesis of LiPF₆ is carried out in saturated lithium fluoride solution (LiF) in hydrogen fluoride (HF), while passing a gaseous mixture through the solution, the gaseous mixture containing phosphorus pentafluoride(PF₅) and hydrogen chloride (HCl), obtained by reacting PCl₅ with hydrogen fluoride. PF₅ in the solution is in excess with respect to the stoichiometric amount of LiF. LiPF₆ is removed from the reaction system in form of a filtrate without recourse to evaporating HF. The method is realised in an apparatus which includes an apparatus for preparing lithium fluoride solution in HF, a LiPF₆ synthesis reactor with a circulation loop and a selective condenser, an apparatus for filtering and separating LiPF₆ from the solution and degasifier-collector for recirculating the mother solution.

EFFECT: invention enables to obtain lithium hexafluorophosphate of high quality.

4 cl, 1 tbl, 1 dwg