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AssigneesLinde Aktiengesellschaft, Huls Aktiengesellschaft
InventorsWolfgang Forg, Gerhard Ranke, Michael Heisel, Dietrich Maschmeyer, Robert Walter
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The invention relates to a process for the removal of HCN from gas mixtures that contain at least HCN and sulfur compounds, especially from gas mixtures that are obtained by partial oxidation of hydrocarbons, by catalytic decomposition of HCN, as well as a catalyst for the decomposition of HCN. According to the invention, the gas mixture is brought into contact with a catalyst which decomposes the HCN by hydrogenation and/or by hydrolysis and COS that is contained in the gas mixture is decomposed at least partially in this catalyst by hydrolysis. Advantageously, a catalyst that is based on titanium oxide and/or zirconium oxide as a vehicle and that contains chromium oxide as an active component is used. Advantageously, the catalyst is reduced during catalyst production or before use with H.sub.2 and/or a reducing gas at temperatures above the operating temperature of catalytic decomposition.
A process for the removal of HCN and COS from a gas mixture containing at least HCN, H.sub.2 O, H.sub.2 S and COS, comprising contacting the gas mixture at a temperature of 130.degree.-170.degree. C. with a catalyst which decomposes the HCN at least partially by hydrogenation and/or by hydrolysis, and COS at least partially by hydrolysis, said catalyst consisting essentially of 70-95% by weight of at least one of titanium oxide and zirconium oxide as a carrier, and 3-15% by weight of chromium in the form of Cr.sub.2 O.sub.3, and decomposing at least some HCN and hydrolyzing at least some COS, said decomposition being conducted prior to scrubbing to remove H.sub.2 S from the gas mixture.
Dependencies are inferred from the claim text.