Catalytic oxidation of vinyl chloride
AssigneePPG Industries, Inc.
InventorsEdward J. Sare, Jerome M. Lavanish
Life of this patent
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Abstract
Vinyl chloride is incinerated at relatively mild temperatures, e.g., 20.degree. to 300.degree.C., by contacting it in a combustion zone with an oxygen-containing gas in the presence of hydrated metal oxide catalyst selected from the group consisting of the oxides of manganese, copper, and mixtures of said oxides. The temperature of incineration is adjusted within the range of 20.degree.-300.degree.C. depending on the relative humidity of the gases in the combustion zone to maintain catalytic activity. Commonly, the vinyl chloride is contained in a gas stream in small amounts, e.g., less than 0.05 weight percent.
Claims19
A method for reducing the vinyl chloride content of a vinyl chloride-containing gas stream, which comprises contacting the vinyl chloride of said gas stream with an oxidizing amount of oxygen-containing gas at temperatures of from 20.degree. to 300.degree. C. in the presence of hydrated metal oxide catalyst selected from the group consisting of copper (II) oxide, manganese (IV) oxide, manganese (III) oxide, manganese (II, III) oxide, and mixtures of such manganese oxides with copper (II) oxide or copper (I) oxide for a time sufficient to reduce said vinyl chloride content of the gas stream, said temperature being such as to inhibit water induced loss of catalyst activity.
A method for reducing the vinyl chloride content of a vinyl chloride-containing air stream, which comprises contacting said air stream with an oxidizing amount of oxygen-containing gas at temperatures within the range of from about 100.degree. to about 250.degree. C. in the presence of hydrated metal oxide catalyst selected from the group consisting of copper (II) oxide, manganese (III) oxide, manganese (IV) oxide, manganese (II, III) oxide, and mixtures of such manganese oxides with copper (II) oxide for a time sufficient to reduce said vinyl chloride content of said air stream, said temperature being such as to inhibit water induced loss of catalyst activity.
A method for reducing the vinyl chloride content of a process air stream containing same, which comprises dehumidifying the vinyl chloride-containing air stream to a relative humidity of less than 5 percent, and passing the dehumidified stream in contact with hydrated metal oxide catalyst selected from the group consisting of copper (II) oxide, manganese (IV) oxide, manganese (III) oxide, manganese (II, III) oxide, and mixtures of such manganese oxides with copper (II) oxide or copper (I) oxide at from about 100.degree. to about 250.degree. C.
Dependencies are inferred from the claim text.