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US4059677A
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Catalytic oxidation of C2 -C4 halogenated hydrocarbons
Assignee: PPG Industries Inc
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Filing: 1976-12-23
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Granted: 1977-11-22
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Expires: 1996-12-23
Abstract
Abstract C 2 -C 4 halogenated, e.g., chlorinated and brominated, hydrocarbons, such as vinyl chloride, present in a gas stream are removed therefrom, e.g., incinerated, by contacting the gas stream with an oxygen-containing gas in the presence of metal oxide catalyst system consisting essentially of the oxides of manganese and cobalt at relatively low temperatures, e.g., 100° C. Commonly, the halogenated hydrocarbon is present in the gas stream to be treated in small amounts, e.g., less than 0.05 weight percent. The temperature of treatment can vary, e.g., from 20° C. to 500° C., and can be adjusted within said range depending on the relative humidity of the gas stream treated to maintain catalytic activity. Preferably, treatment occurs under conditions of low relative humidity, e.g., less than 5 percent, and the metal oxides of the catalyst system are hydrated.
Inventors
- 👤 Edward J. Sare
- 👤 Jerome M. Lavanish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8659; B01D53/8662; B01D53/46; B01D53/48; B01D53/52; B01D53/526; B01D53/72
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
120 words
A method for treating a C 2 -C 4 halogenated hydrocarbon containing gas stream, said halogenated hydrocarbon being selected from the group consisting of chlorinated and brominated hydrocarbons, which comprises contacting the halogenated hydrocarbon with an oxidizing amount of oxygen-containing gas in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 19:1 to 1:19, at temperatures within the range of from 20° C., to 500° C., for a time sufficient to reduce the halogenated hydrocarbon content of the gas stream, said temperature being such as to inhibit water-induced loss of catalyst activity.
Claim 2
Independent Claim
120 words
A method for treating a C 2 -C 4 halogenated hydrocarbon containing gas stream, said halogenated hydrocarbon being selected from the group consisting of chlorinated and brominated hydrocarbons, which comprises contacting the halogenated hydrocarbon with an oxidizing amount of oxygen-containing gas in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 19:1 to 1:19, at temperatures within the range of from 20° C., to 500° C., for a time sufficient to reduce the halogenated hydrocarbon content of the gas stream, said temperature being such as to inhibit water-induced loss of catalyst activity.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the halogenated hydrocarbon is vinyl chloride, vinylidene chloride, ethylene dichloride, 1,1,1-tri-chloroethane, 1,1,2-trichloroethane, trichloroethylene, perchloroethylene or mixtures of such chlorinated hydrocarbons.
Claim 4
Dependent Claim
13 words
The method of claim 1, wherein the gas stream is an air stream.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein the gas stream contains from 0.0005 to 4 weight percent halogenated hydrocarbon.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the temperature is from 50° C. to 300° C.
Claim 7
Dependent Claim
32 words
The method of claim 1 wherein the cobalt oxide is hydrated cobalt oxide and is selected from the group consisting of cobalt (II) oxide, cobalt (III) oxide and cobalt (II, III) oxide.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein the manganese oxide is manganese (IV) oxide, manganese (III) oxide, manganese (II, III) oxide or mixtures of such oxides of manganese.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the relative humidity of the combined gas streams contacting the catalyst is less than 5 percent.
Claim 10
Dependent Claim
15 words
The method of claim 8 wherein the relative humidity is less than about 2 percent.
Claim 11
Dependent Claim
41 words
The method of claim 1 wherein the oxides of cobalt and manganese contain water of hydration in an amount at least as high as that obtained by drying an aqueous filter cake of the respective precipitated metal oxides at 200° C.
Claim 12
Independent Claim
104 words
A method for treating C 2 -chlorinated hydrocarbon containing air stream, which comprises contacting the chlorinated hydrocarbon with an oxidizing amount of oxygen at temperatures within the range of from 20° C. to 500° C. in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 10:1 to 1:10, for a time sufficient to reduce the C 2 -chlorinated hydrocarbon content of the air stream, said temperature being such as to inhibit water-induced loss of catalyst activity.
Claim 13
Independent Claim
104 words
A method for treating C 2 -chlorinated hydrocarbon containing air stream, which comprises contacting the chlorinated hydrocarbon with an oxidizing amount of oxygen at temperatures within the range of from 20° C. to 500° C. in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 10:1 to 1:10, for a time sufficient to reduce the C 2 -chlorinated hydrocarbon content of the air stream, said temperature being such as to inhibit water-induced loss of catalyst activity.
Claim 14
Dependent Claim
16 words
The method of claim 11 wherein the chlorinated hydrocarbon contains from 2 to 3 chlorine atoms.
Claim 15
Dependent Claim
13 words
The method of claim 12 wherein the cobalt oxide is hydrated cobalt oxide.
Claim 16
Dependent Claim
49 words
The method of claim 13 wherein the manganese oxide is manganese (IV) oxide, manganese (III) oxide, manganese (II, III) oxide or mixtures of such oxides of manganese and the cobalt oxide is cobalt (II) oxide, cobalt (III) oxide, cobalt (II, III) oxide or mixtures of such oxides of cobalt.
Claim 17
Dependent Claim
22 words
The method of claim 14 wherein the relative humidity of the combined gas streams contacting the catalyst is less than 5 percent.
Claim 18
Dependent Claim
16 words
The method of claim 14 wherein the temperature is within the range of 20° C.-300° C.
Claim 19
Independent Claim
111 words
A method for reducing the vinyl chloride content of a vinyl chloride-containing gas stream which comprises contacting the vinyl chloride of the gas stream with an oxidizing amount of oxygen-containing gas in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 5:1 to 1:5 at temperatures within the range of from 20° C. to 300° C., for a time sufficient to reduce the vinyl chloride content of the gas stream, said temperature being such as to inhibit water induced loss of catalyst activity.
Claim 20
Independent Claim
111 words
A method for reducing the vinyl chloride content of a vinyl chloride-containing gas stream which comprises contacting the vinyl chloride of the gas stream with an oxidizing amount of oxygen-containing gas in the presence of metal oxide catalyst system, the metal oxide catalyst content of which consists essentially of a mixture of hydrated manganese oxide and cobalt oxide, the weight ratio of manganese oxide to cobalt oxide being from 5:1 to 1:5 at temperatures within the range of from 20° C. to 300° C., for a time sufficient to reduce the vinyl chloride content of the gas stream, said temperature being such as to inhibit water induced loss of catalyst activity.
Claim 21
Dependent Claim
13 words
The method of claim 17 wherein the cobalt oxide is hydrated cobalt oxide.
Claim 22
Dependent Claim
22 words
The method of claim 18 wherein the relative humidity of the combined gas streams contacting the catalyst is less than 5 percent.
Claim 23
Dependent Claim
34 words
The method of claim 18 wherein the vinyl chloride-containing gas stream is an air stream and the air stream has a relative humidity of less than 5 percent before contacting the metal oxide catalyst.
Claim 24
Dependent Claim
18 words
The method of claim 18 wherein the temperature is within the range of 80° C. to 250°to C.
Claim 25
Dependent Claim
36 words
The method of claim 17 wherein the total amount of oxygen-containing gas is at least that amount which is required to oxidize the carbon and hydrogen content of the vinyl chloride to carbon dioxide and water.
Claim 26
Dependent Claim
21 words
The method of claim 17 wherein the vinyl chloride content of the gas steam is from 0.001 to 0.1 weight percent.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |