US3661519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrolysis of silicon tetrafluoride
Assignee: Cities Service Co
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Filing: 1970-07-01
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Granted: 1972-05-09
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Expires: 1990-07-01
Abstract
Abstract A mixture comprising oxygen, a hydrocarbon fuel and silicon tetrafluoride is burned, the amount of oxygen in the mixture being insufficient for complete combustion of the fuel. A substantial portion of the silicon tetrafluoride is hydrolyzed within the resulting incomplete-combustion hydrocarbon flame, oxygen being added thereafter for combustion of the remaining fuel therein. Probably because of free radical initiation in the incomplete-combustion flame, the conversion efficiency of silicon tetrafluoride to silica can be maintained at high levels while temperatures remain below the fusion-sintering point of the silica, i.e., not in excess of about 1,600* F.
Inventors
- 👤 Richard E Driscoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B33/184; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the flame temperature is within the range of about 1,200*-1,400* F.
Claim 2
Dependent Claim
24 words
The process of claim 1 wherein the fuel gas is selected from the group consisting of methane, ethane, propane, butane, hydrogen and mixtures thereof.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein the oxygen that is supplied to the mixture that is burned is furnished thereto as a gas selected from the group consisting of substantially pure oxygen, air, and air enriched with oxygen.
Claim 4
Dependent Claim
34 words
The process of claim 1 wherein the mass ratio of flame reactants and diluents to silicon tetrafluoride which are formed into the hydrolysis mixture is within the range of about 10 to about 110.
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein oxygen is supplied to the hydrolysis mixture in the form of air while silicon tetrafluoride is supplied thereto in mixture with a diluent vapor.
Claim 6
Dependent Claim
12 words
The process of claim 6 wherein the diluent vapor comprises water vapor.
Claim 7
Dependent Claim
26 words
The process of claim 6 wherein the mol fraction of silicon tetrafluoride in the diluted mixture is within the range of about 0.02 to about 0.14.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein the stoichiometric fraction, phi , is within the range of about 1.5 to about 1.8.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |