Separation of CO.sub.2 and H.sub.2 S from hydrogen containing gas

US4533373A · kind A · utility

Assignee

• Linde GmbH · DE

Inventors

• Peter Butz · Langenfeld, DE
• Gerhard Ranke · Pöcking, DE
• Tran A. Tvan · Schwanau, DE

Key dates

• Filing date: Jun 3, 1983
• Grant date: Aug 6, 1985
• Expiry date: Jun 3, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S62/931
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

For the purification of hydrocarbon-containing, e.g., methane raw gases containing H.sub.2 S and CO.sub.2, the raw gas is dried, and separated by rectification into a hydrocarbon-rich overhead fraction containing some H.sub.2 S and CO.sub.2 and into a bottom fraction consisting essentially of H.sub.2 S and CO.sub.2. The overhead product is freed, in a first scrubbing column, of the acidic components with a physical acting scrubbing medium selective for H.sub.2 S and COS as against CO.sub.2, e.g., polyethylene glycol ether or toluene. The bottom product from the rectification step is vaporized and selectively desulfurized in a second scrubbing column with the same scrubbing medium, and the scrubbed gas from the second scrubbing column is discharged as CO.sub.2 under pressure.