US3956147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal fluorides from fluosilicic acid
Assignee: Bayer AG
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Filing: 1974-01-28
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Granted: 1976-05-11
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Expires: 1994-01-28
Abstract
Abstract A process which comprises reacting at a temperature above 100°C. a metal oxide, hydroxide or a mixture thereof with aqueous fluosilicic acid, said fluosilicic acid having a concentration of about 10 to 45% by weight, to form gaseous silicon tetrafluoride and the corresponding metal fluoride and recovering said metal fluoride from the reaction medium.
Inventors
- 👤 Wolf Becker
- 👤 Heinz Jonas
- 👤 Wolfgang Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
C; C01; C01G; C01G43/00; C01G43/04; C01G43/06; C01B; C01B33/00; C01B33/08; C01B9/00; C01B9/08; C01F; C01F11/00; C01F11/20; C01F11/22; C01F7/00; C01F7/48; C01F7/50; C01G37/00; C01G37/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A process which comprises heating a metal oxide, hydroxide or mixture thereof wherein the metal is selected from the group consisting of aluminum, calcium, chromium and uranium in aqueous fluosilicic acid, to about 140° to 240°C at a pressure of from 5 to 30 atmospheres gauge, said fluosilicic acid having a concentration of about 10 to 45% by weight and being present in a 1 to 20% stoichiometric excess, based on the metal oxide, hydroxide or mixture thereof, whereby silicon tetrafluoride is removed from said fluosilicic acid in gaseous form and the remaining hydrogen fluoride in said aqueous solution forms the corresponding metal fluoride and recovering said metal fluoride from the reaction mixture.
Claim 2
Dependent Claim
113 words
A process which comprises heating a metal oxide, hydroxide or mixture thereof wherein the metal is selected from the group consisting of aluminum, calcium, chromium and uranium in aqueous fluosilicic acid, to about 140° to 240°C at a pressure of from 5 to 30 atmospheres gauge, said fluosilicic acid having a concentration of about 10 to 45% by weight and being present in a 1 to 20% stoichiometric excess, based on the metal oxide, hydroxide or mixture thereof, whereby silicon tetrafluoride is removed from said fluosilicic acid in gaseous form and the remaining hydrogen fluoride in said aqueous solution forms the corresponding metal fluoride and recovering said metal fluoride from the reaction mixture.
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein the gaseous silicon tetrafluoride is hydrolyzed in an aqueous medium to silicon dioxide and aqueous fluosilicic acid and the latter is utilized as aqueous fluosilicic acid reactant to produce said corresponding metal fluoride.
Claim 4
Dependent Claim
38 words
The process of claim 1 wherein said reaction mixture contains suspended metal fluoride and aqueous fluosilicic acid and said aqueous fluosilicic in said reaction mixture is utilized as aqueous fluosilicic acid reactant to produce said corresponding metal fluoride.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |