US4018879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion of halogenated hydrocarbon
Assignee: Shell USA Inc
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Filing: 1976-06-21
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Granted: 1977-04-19
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Expires: 1996-06-21
Abstract
Abstract A process and apparatus for combusting halogenated organic materials wherein such materials are combusted at a temperature of at least 600° C in a refractory-lined furnace, the combustion gases formed are cooled and the acid constituent(s) thereof are subsequently stripped by contact with an aqueous liquid, the furnace being externally cooled such that the temperature of its metal casing lies between 140° and 375° C thereby minimizing corrosion of the casing.
Inventors
- 👤 Denis F. Winnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; F23M5/085; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; B01D53/70; C; C01; C01B; C01B7/00; C01B7/01; F23G; F23G7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
In the process for the combustion of halogenated organic materials wherein such materials are combusted at a temperature of at least 600° C in a metal-cased refractory-lined furnace, the combustion gases formed are cooled and at least one acid constituent thereof removed by contact with an aqueous liquid, an aqueous acid solution is recovered and cooled acid-free gases are discharged to the atmosphere, the improvement which comprises flowing air through an air jacket formed by the metal casing of the furnace and a cover surrounding the furnace with the air entering the air jacket through at least one air inlet on the bottom of said cover and exiting the top of the air jacket through at least one stack on the top of said cover, the distance between the metal casing of the furnace and said cover and the number and size of the inlets and stacks being such that the temperature of the metal casing of the furnace is maintained by the flow of air between about 140° and about 375° C.
Claim 2
Dependent Claim
173 words
In the process for the combustion of halogenated organic materials wherein such materials are combusted at a temperature of at least 600° C in a metal-cased refractory-lined furnace, the combustion gases formed are cooled and at least one acid constituent thereof removed by contact with an aqueous liquid, an aqueous acid solution is recovered and cooled acid-free gases are discharged to the atmosphere, the improvement which comprises flowing air through an air jacket formed by the metal casing of the furnace and a cover surrounding the furnace with the air entering the air jacket through at least one air inlet on the bottom of said cover and exiting the top of the air jacket through at least one stack on the top of said cover, the distance between the metal casing of the furnace and said cover and the number and size of the inlets and stacks being such that the temperature of the metal casing of the furnace is maintained by the flow of air between about 140° and about 375° C.
Claim 3
Dependent Claim
20 words
The process in claim 1 in which the temperature of the metal casing is maintained between 160° and 300° C.
Claim 4
Dependent Claim
23 words
The process in claim 1 in which the flow of air through the air jacket is regulated by valves positioned in the stacks.
Claim 5
Dependent Claim
18 words
The process in claim 1 in which the height of the stack is not more than 10 meters.
Claim 6
Dependent Claim
19 words
The process in claim 1 in which the thickness of the air jacket is not less than 2.5 centimeters.
Claim 7
Dependent Claim
29 words
The process in claim 1 in which the refractory lined furnace is cooled by an air jacket through which cooling air is passed by at least one air blower.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |