Solvate of lithium hexafluorophosphate and pyridine, its preparation and preparation process for lithium hexafluorophosphate using said solvate
US5993767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D15/005
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a lithium hexafluorophosphate solvate usable for the preparation of high purity lithium hexafluorophosphate. This solvate of lithium hexafluorophosphate and pyridine complies with the formula: EQU Li(C.sub.5 H.sub.5 N)PF.sub.6 and is prepared by a process comprising the following stages: PA1 a) preparation of pyridinium hexafluorophosphate of formula C.sub.5 H.sub.5 NHPF.sub.6 by the neutralization of hexafluorophosphoric acid HPF.sub.6 with pyridine and PA1 b) conversion of the pyridinium hexafluorophosphate into solvate LiPF.sub.6, C.sub.5 H.sub.5 N by exchange with a lithium compound chosen from among lithium hydroxide, lithium alkoxides and alkyl-lithiums. The LiPF.sub.6 can be regenerated from the solvate by vacuum decomposition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.