Removal of CO.sub.2 and H.sub.2 S from natural gases

US4537753A · kind A · utility

Assignee

• BASF SE

Inventors

• Eckhart Wagner · Ludwigshafen, DE
• Klaus Volkamer · Bischofswerda, DE
• Ulrich Wagner · Bernburg, DE

Key dates

• Filing date: Sep 30, 1983
• Grant date: Aug 27, 1985
• Expiry date: Sep 30, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/151
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

CO.sub.2 and, where relevant, H.sub.2 S are removed from natural gases which contain CO.sub.2 and may or may not contain H.sub.2 S by a process in which the said natural gases are treated, in an absorption stage at from 40.degree. to 100.degree. C., with an aqueous absorption liquid containing from 20 to 70% by weight of methyldiethanolamine, the treated natural gases are taken off at the top of the absorption stage, the aqueous absorption liquid laden with CO.sub.2 and, where relevant, H.sub.2 S is taken off at the bottom of the absorption stage and then regenerated in one or more flash stages, and the regenerated absorption liquid is recycled to the absorption stage.