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US3607020A
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Preparation of lithium hexafluorophosphate
Assignee: Foote Mineral Co
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Filing: 1970-03-19
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Granted: 1971-09-21
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Expires: 1990-03-19
Abstract
Abstract Lithium hexafluorophosphate is prepared by reacting lithium fluoride with phosphorus pentafluoride in an inert organic solvent.
Inventors
- 👤 William Novis Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:36
CPC Classifications
C; C01; C01D; C01D15/00; C01D15/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
25 words
The method of claim 1 wherein the amount of phosphorus pentafluoride employed is in excess of that stoichiometrically required for reaction with the lithium fluoride.
Claim 2
Dependent Claim
23 words
The method of claim 2 wherein from about 1 to about 2 moles of phosphorus pentafluoride are used per mole of lithium fluoride.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the lithium fluoride is present in the inert solvent in a concentration of at least about 3 percent, by weight, based on the weight of the solvent system.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the reaction is carried out at a temperature of from about 0* to about 50* C.
Claim 5
Dependent Claim
25 words
The method of claim 5 wherein the reaction is carried out at a temperature of from about 10* to about 30* C. under ambient pressure.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the solvent is diethyl ether.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the solvent is a mixture of diethyl ether and methyl formate.
Claim 8
Dependent Claim
47 words
The method of claim 1 wherein the lithium fluoride is first added to the inert organic solvent, followed by gradually adding the phosphorus pentafluoride to the reaction mixture, the addition of phosphorus pentafluoride being an amount at least substantially sufficient to react with the available lithium fluoride.
Claim 9
Dependent Claim
32 words
The method of claim 9 wherein the amount of phosphorous pentafluoride added during the reaction with lithium fluoride does not exceed the amount required to saturate the solvent system with phosphorus pentafluoride.
Claim 10
Dependent Claim
21 words
The method of claim 9 wherein the reaction is carried out at a temperature of from about 0*to about 50* C.
Claim 11
Dependent Claim
25 words
The method of claim 9 wherein The reaction is carried out at a temperature of from about 10* to about 30* C. under ambient pressure.
Claim 12
Dependent Claim
11 words
The method of claim 9 wherein the solvent is diethyl ether.
Claim 13
Dependent Claim
17 words
The method of claim 9 wherein the solvent is a mixture of diethyl ether and methyl formate.
Claim 14
Dependent Claim
39 words
The method of claim 1 wherein the product is recovered through precipitation of the lithium hexafluorophosphate from the reaction mixture by adding sufficient phosphorus pentafluoride to the reaction system to at least saturate the solvent system with phosphorus pentafluoride.
Claim 15
Dependent Claim
41 words
The method of claim 15 wherein the precipitating phosphorus pentafluoride is added in an amount at least about 25 percent in excess, on a molar basis, of the stoichiometric amount of phosphorus pentafluoride required for the reaction with the lithium fluoride.
Claim 16
Dependent Claim
39 words
The method of claim 9 wherein the product is recovered through precipitation of the lithium hexafluorophosphate from the reaction mixture by adding sufficient phosphorus pentafluoride to the reaction system to at least saturate the solvent system with phosphorus pentafluoride.
Claim 17
Dependent Claim
45 words
The method of claim 17 wherein the precipitating phosphorus pentafluoride is added in an amount at least about 25 percent in excess, on a molar basis, of the stoichiometric amount of phosphorous pentafluoride required for the reaction between the lithium fluoride and the phosphorus pentafluoride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |