Borofluoride lithium-1 hydrogen fluoride salts and their preparation, as well as, anhydrous borofluoride process of lithium using the same

摘要

PROBLEM TO BE SOLVED: To produce a high-purity anhydrous lithium borofluoride by providing a new lithium borofluoride monohydrofluoride using a synthetic method for reacting lithium fluoride with boron trifluoride in the presence of anydrous hydrogen fluoride, etc., and then drying the resultant lithium borofluoride monohydrifluoride. ;SOLUTION: (A) Lithium borofluoride monohydrofluoride represented by the formula LiBF₄.HF is synthesized according to any method for (l) reacting lithium fluoride with boron trif1uoride in the presence of anhydrous hydrogen fluoride, (2) reacting lithium borofluoride containing lithium borofluoride monohydrate represented by the formula LiBF₄.H₂O with anhydrous hydrogen fluoride or (3) reacting lithium fluoride prepared according to other synthetic methods with anhydrous hydrogen fluoride. (B) The resultant lithium borofluoride monohydrofluoride represented by the formula LiBF₄.HF is then dried at a temperature below 20°C to thereby remove HF and afford the high- purity anhydrous lithium borofluoride.;COPYRIGHT: (C)1998,JPO