Process for removing hydrogen sulphide and sulphur dioxide from claus tail gases

US4315904A · kind A · utility

Assignee

• Davy International AG · DE

Inventors

• Rainer Lell · Nidderau, DE
• Ghazi R. Al-Muddarris · Cologne, DE
• Reinhard Pachaly · Kerpen, DE

Key dates

• Filing date: Jun 12, 1980
• Grant date: Feb 16, 1982
• Expiry date: Jun 12, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/0456
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for removing hydrogen sulphide and sulphur dioxide from a Claus reaction tail gas comprises separating the tail gas into two partial streams, conducting the first partial stream through a first catalyst bed charged with sulphur while at a temperature above the sulphur dew point, separating out the discharged sulphur from the first partial stream by condensation, combining the first partial stream freed from sulphur with the second partial stream, and passing the combined gas stream through a second catalyst bed already freed from sulphur while at a temperature below the sulphur dew point. When the second catalyst bed becomes charged with sulphur and the first catalyst bed becomes free of sulphur, the flow of gas through the beds is reversed.