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US4654203A
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Process for the chemical thermodecomposition of higher halogenated hydrocarbons
Assignee: Nukem GmbH
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Filing: 1985-12-20
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Granted: 1987-03-31
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Expires: 2005-12-20
Abstract
Abstract A halohydrocarbon is destroyed chemical-thermally by reacting at 600° to 800° C. with calcium oxide and/or calcium hydroxide. The process can be carried out problem-free by having the calcium oxide of hydroxide present in at least twice the stoichiometric excess based on the halogen to be bound and by having the composition contain 2-30 wt. % iron oxide.
Inventors
- 👤 Paul-Gerhard Maurer
- 👤 Daniel Neupert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:27
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/40; A62D3/30; A62D3/36; A62D2101/00; A62D2101/04; A62D2101/06; A62D2101/20; A62D2101/22; A62D2203/00; A62D2203/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
70 words
A process of chemically-thermally decomposing a halogenated hydrocarbon or halogenated hydrocarbons consisting essentially of reacting reactants consisting of the halogenated hydrocarbons or halogenated hydrocarbon with an excess of at least one member of the group consisting of calcium oxide and calcium hydroxide at a temperature of 600° to 800° C. and in the presence of 2 to 30 wt. % of iron oxide based on the member of said group.
Claim 2
Dependent Claim
70 words
A process of chemically-thermally decomposing a halogenated hydrocarbon or halogenated hydrocarbons consisting essentially of reacting reactants consisting of the halogenated hydrocarbons or halogenated hydrocarbon with an excess of at least one member of the group consisting of calcium oxide and calcium hydroxide at a temperature of 600° to 800° C. and in the presence of 2 to 30 wt. % of iron oxide based on the member of said group.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the halogenated hydrocarbon includes polychlorinated biphenyls.
Claim 4
Dependent Claim
31 words
A process according to claim 1 wherein there is employed a two to five fold stoichiometric excess of the calcium oxide, calcium hydroxide, or mixture of calcium oxide and calcium hydroxide.
Claim 5
Dependent Claim
29 words
A process according to claim 3 wherein the calcium oxide, calcium hydroxide, or mixture of calcium oxide and calcium hydroxide contains 3 to 25 wt. % of iron oxide.
Claim 6
Dependent Claim
29 words
A process according to claim 1 wherein the calcium oxide, calcium hydroxide, or mixture of calcium oxide and calcium hydroxide contains 3 to 25 wt. % of iron oxide.
Claim 7
Dependent Claim
23 words
A process according to claim 5 wherein at least a portion of the iron oxide is present as fly ash from a furnace.
Claim 8
Dependent Claim
23 words
A process according to claim 4 wherein at least a portion of the iron oxide is present as fly ash from a furnace.
Claim 9
Dependent Claim
23 words
A process according to claim 3 wherein at least a portion of the iron oxide is present as fly ash from a furnace.
Claim 10
Dependent Claim
23 words
A process according to claim 2 wherein at least a portion of the iron oxide is present as fly ash from a furnace.
Claim 11
Dependent Claim
23 words
A process according to claim 1 wherein at least a portion of the iron oxide is present as fly ash from a furnace.
Claim 12
Dependent Claim
32 words
A process according to claim 1 wherein the gaseous reactants formed are halogen free and are comprised of (a) hydrogen, methane and carbon monoxide or (b) hydrogen, methane and other lower hydrocarbons.
Claim 13
Dependent Claim
23 words
A process according to claim 1 wherein the gaseous reactants formed are halogen free and consist essentially of hydrogen, methane and carbon monoxide.
References Cited (Backward Citations)
US3845191A
Cited
US4201751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |