Process for decomposing fluorocarbons reagent and apparatus used therefor
AssigneesDowa Mining Co., Ltd., Dowa Iron Power Co., Ltd., Showa Denko K.K.
InventorsChiaki Izumikawa, Kazumasa Tezuka, Kazuto Ito, Hitoshi Atobe, Toraichi Kaneko
Life of this patent
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Abstract
Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.
Claims18
A process for decomposing a fluorocarbon which comprises contacting a perfluorocarbon or hydrofluorocarbon gas with a reagent consisting essentially of elemental carbon and at least one alkaline earth metal compound, at a temperature of 300° C. or higher and in the presence of more than 0 vol % and up to 20 vol % of gaseous oxygen, wherein said at least one alkaline earth metal compound is selected from the group consisting of oxides, hydroxides, carbonates, and nitrates of alkaline earth metals.
A process for decomposing a fluorocarbon which comprises contacting a gaseous fluorocarbon with a reagent consisting essentially of elemental carbon, at least one alkaline earth metal compound selected from the group consisting of oxides, hydroxides, carbonates, and nitrates of alkaline earth metals and at least one alkali metal compound selected from the group consisting of hydroxides, carbonates, phosphates, aluminates, nitrates, and sulfates of alkali metals at a temperature of 200° C. or higher, wherein the gaseous fluorocarbon to be contacted with the reagent contains 0.01 to 25% by volume of oxygen.
Dependencies are inferred from the claim text.