Process for the removal of HCN from gas mixtures

US5660807A · kind A · utility

Assignees

• Linde GmbH · DE
• Huls Aktiengesellschaft · DE

Inventors

• Wolfgang Forg · Icking, DE
• Gerhard Ranke · Pöcking, DE
• Michael Heisel · Munich, DE
• Dietrich Maschmeyer · Recklinghausen, DE
• Robert J. Walter · Thousand Oaks, US

Key dates

• Filing date: May 13, 1996
• Grant date: Aug 26, 1997
• Expiry date: May 13, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B2203/0485
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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.