US4258023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the pyrogenous production of very finely divided oxides of a metal and/or of a metalloid
Assignee: Evonik Operations GmbH
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Filing: 1979-10-16
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Granted: 1981-03-24
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Expires: 1999-10-16
Abstract
Abstract In case of the pyrogenous production of metal oxides or metalloid oxides, whenever a halogen compound is used as a starting material, an elementary halogen is formed as a byproduct. This may be converted in the cooling section of the reaction apparatus with hydrogen into hydrogen halide. For a better temperature control and prevention of uncontrolled deflagration of the hydrogen in case of the halogen detonating gas reaction, according to the invention the hydrogen is introduced into the cooling section by means of a double jacket pipe, whereby an inert gas is introduced additionally by way of the interstice between the inside wall and the outside jacket of the double jacket pipe into the cooling section.
Inventors
- 👤 Josef Schmid
- 👤 Ludwig Lange
- 👤 Hans Klebe
- 👤 Dieter Schutte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:48
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/302; C01G; C01G17/00; C01G17/02; C01G23/00; C01G23/04; C01G23/047; C01G23/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
In a process for the pyrogenic production of a finely dispersed oxide of a metal or a metalloid in a reaction apparatus wherein an evaporable halogen compound of the metal or metal oxide is used as the starting material and wherein elementary halogen is formed as a by-product during the conversion of said evaporable halogen compound to said oxide, and further wherein said halogen by product is converted into hydrogen halide during the cooling down of the reaction products by feeding gaseous hydrogen into the cooling section of said apparatus by means of a pipe entering into the cooling section of said apparatus, the improvement comprising introducing the gaseous hydrogen into the cooling section of the apparatus by means of the inner pipe of at least one double-jacket pipe, which is inserted into the cooling section whereby simultaneously an inert gas is introduced into said cooling section by means of the same double-jacket pipe, which inert gas is guided between the outside and the inside jacket of the double jacket pipe.
Claim 2
Dependent Claim
171 words
In a process for the pyrogenic production of a finely dispersed oxide of a metal or a metalloid in a reaction apparatus wherein an evaporable halogen compound of the metal or metal oxide is used as the starting material and wherein elementary halogen is formed as a by-product during the conversion of said evaporable halogen compound to said oxide, and further wherein said halogen by product is converted into hydrogen halide during the cooling down of the reaction products by feeding gaseous hydrogen into the cooling section of said apparatus by means of a pipe entering into the cooling section of said apparatus, the improvement comprising introducing the gaseous hydrogen into the cooling section of the apparatus by means of the inner pipe of at least one double-jacket pipe, which is inserted into the cooling section whereby simultaneously an inert gas is introduced into said cooling section by means of the same double-jacket pipe, which inert gas is guided between the outside and the inside jacket of the double jacket pipe.
Claim 3
Dependent Claim
19 words
The process of claim 2 wherein the evaporable halogen compound is a compound of aluminum, titanium, silicon or germanium.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein the hydrogen and inert gas are introduced into said reaction apparatus in the cooling section thereof where the temperature ranges from 500° C. to 700° C.
Claim 5
Dependent Claim
21 words
The process of claim 2 wherein the length of the double jacket pipe corresponds to the diameter of the cooling section.
References Cited (Backward Citations)
CA768059A
Cited
US3201337A
Cited
US3361525A
Cited
GB1066651A
Cited
GB1121279A
Cited
US3695840A
Cited
US3954945A
Cited
GB1513890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |