Patent US4347229A successfully refreshed from Google Patents.
US4347229A
Expired / Lapsed
US
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Process for the pyrogenic production of finely divided oxide of a metal and/or a metalloid
Assignee: Evonik Operations GmbH
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Filing: 1980-06-03
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Granted: 1982-08-31
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Expires: 2000-06-03
Abstract
Abstract There is provided a pyrogenic process for the production of finely divided oxide of a metal and/or a metalloid in which there is employed as the starting material a vaporizable halogen compound of a metal and/or metalloid. Because of the starting material there is formed elemental halogen which is an impurity in the oxide formed. To remove the halogen there is supplied to the cooling section of the production plant a mixture of hydrogen and inert gas.
Inventors
- 👤 Josef Schmid
- 👤 Ludwig Lange
- 👤 Hans Klebe
- 👤 Dieter Schutte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:47
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B13/00; C01B13/14; C01B13/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
In a process for the production of a finely divided oxide of a metal or metalloid or mixture of a metal oxide and a metalloid oxide employing as starting materials (1) a vaporizable halogen compound of the metal, metalloid or mixture of metal and metalloidal halide, (2) an oxygen containing gas and (3) a combustible gas and in which the elemental halogen formed during the formation of the oxide of the metal or metalloid or mixture thereof from the burning of the combustible gas and the hydrolysis of the vaporizable halogen compound is reacted during the cooling of the reaction product with gaseous hydrogen introduced below reaction temperature of the oxyhydrogen gas mixture formed by mixing the gaseous hydrogen with oxygen containing waste gases to form hydrogen halide, the improvement comprising mixing the gaseous hydrogen with an inert gas and introducing the mixture into the cooling section through a single pipe into the waste gases containing halogen while the reaction product is cooled in the cooling section.
Claim 2
Dependent Claim
167 words
In a process for the production of a finely divided oxide of a metal or metalloid or mixture of a metal oxide and a metalloid oxide employing as starting materials (1) a vaporizable halogen compound of the metal, metalloid or mixture of metal and metalloidal halide, (2) an oxygen containing gas and (3) a combustible gas and in which the elemental halogen formed during the formation of the oxide of the metal or metalloid or mixture thereof from the burning of the combustible gas and the hydrolysis of the vaporizable halogen compound is reacted during the cooling of the reaction product with gaseous hydrogen introduced below reaction temperature of the oxyhydrogen gas mixture formed by mixing the gaseous hydrogen with oxygen containing waste gases to form hydrogen halide, the improvement comprising mixing the gaseous hydrogen with an inert gas and introducing the mixture into the cooling section through a single pipe into the waste gases containing halogen while the reaction product is cooled in the cooling section.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein there is employed a halide of silicon, germanium, aluminum or titanium.
Claim 4
Dependent Claim
11 words
A process according to claim 2 wherein the halogen is chlorine.
Claim 5
Dependent Claim
13 words
A process according to claim 3 wherein the metal or metalloid is silicon.
Claim 6
Dependent Claim
57 words
A process according to claim 4 wherein the silicon is employed as SiHCl 3 , SiCl 2 H 2 , CH 3 --Si--Cl 3 , (CH 3 ) 2 SiCl 2 , (CH 3 CH 2 ) 2 --Si Cl 2 , (CH 3 ) 3 --SiCl, CH 3 CH 2 --SiCl 3 or SiCl 4 .
Claim 7
Dependent Claim
18 words
A process according to claim 5 wherein the inert gas is a noble gas, carbon dioxide or nitrogen.
Claim 8
Dependent Claim
25 words
A process according to claim 6 wherein the hydrogen-inert gas mixture is introduced into the cooling section at a temperature of 500° to 700° C.
Claim 9
Dependent Claim
33 words
A process according to claim 1 wherein the pipe has a plurality of openings and the mixture of hydrogen and inert gas is introduced into the cooling section through said plurality of openings.
Claim 10
Dependent Claim
28 words
A process according to claim 8 wherein the mixture of hydrogen and inert gas is introduced into the cooling section through 3 to 6 openings in the pipe.
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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |