Process of desulfurizing gases with an amine-containing absorbent solution

US4532116A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Alexander Doerges · Frankfurt am Main, DE
• Johann Schlauer · Schmallenberg, DE
• Manfred Kriebel · Frankfurt am Main, DE
• Anton Hude · Frankfurt am Main, DE

Key dates

• Filing date: Nov 4, 1983
• Grant date: Jul 30, 1985
• Expiry date: Nov 4, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/1493
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The gas which contains sulfur compounds consisting of H.sub.2 S and/or COS is scrubbed with an absorbent solution which contains at least one amine. The gas to be desulfurized which enters the scrubbing zone is at a temperature in the range of 25.degree. to 100.degree. C. and rises in the scrubbing zone in a countercurrent to the scrubbing solution. The gas leaving the absorbent solution is indirectly cooled to a temperature which is at least 20.degree. C. below the entrance temperature of the gas and is not below 5.degree. C. The indirect cooling results in a condensate, which contains at least one secondary amine. That condensate is passed through the scrubbing zone as an absorbent solution. The condensate leaving the scrubbing zone contains at least 10 moles secondary amine and preferably at least 100 moles secondary amine per mole H.sub.2 S and COS in the gas to be desulfurized. The gas to be desulfurized suitably contains secondary amine used in the absorbent solution as well as an organic solvent, such as methanol, ethanol or isopropanol.