Process for manufacture of lithium hexafluorophosphate

Details Process for manufacture of lithium hexafluorophosphate Process for manufacture of lithium hexafluorophosphate

1998-06-03

1999-08-10

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

059355417

ABSTRACT:
The process of the present invention consists in bringing into contact, on the one hand, (A) gaseous phosphorus pentafluoride or a gaseous mixture comprising phosphorus pentafluoride and hydrochloric acid, and, on the other hand, (B) a solution of lithium fluoride in hydrofluoric acid, in a column (10) having a sufficient number of transfer units to carry out the reaction of PF.sub.5 with LiF under the chosen conditions of temperature, of pressure and of molar ratio of the two contrasting reactants and with complete or substantially complete absorption of the PF.sub.5 in the column. This process makes it possible to solve the problems of blockage by preventing recrystallizations of salts; to discharge the heat given off by the reaction by the evaporation of a portion of the HF; and to separate the HCl which may be contained in the starting PF.sub.5, without loss of PF.sub.5, thus allowing subsequent recovery/value enhancement of this HCl. Moreover, this process is very simple, with a very small number of stages, which makes it possible to avoid any entry of air or moisture capable of contaminating the final LiPF.sub.6.

REFERENCES:
patent: 3594402 (1971-07-01), Wiesboeck
patent: 3607020 (1971-09-01), Smith
patent: 5378445 (1995-01-01), Salmon et al.
patent: 5601797 (1997-02-01), Gentry
French Search Report dated Feb. 24, 1998.

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