Removing CO.sub.2 and, if necessary, H.sub.2 S from gases

US4999031A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Gerhardt
• Werner Hefner · Lampertheim, DE

Key dates

• Filing date: Aug 11, 1989
• Grant date: Mar 12, 1991
• Expiry date: Aug 11, 2009

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, if necessary, H.sub.2 S are removed from a gas which contains CO.sub.2 and may contain H.sub.2 S with an absorption liquid by a process in which the gas which contains CO.sub.2 and may contain H.sub.2 S is treated in an absorption zone with the absorption liquid, the treated gas is removed from the absorption zone, the absorption liquid which is obtained from the absorption zone and is laden with CO.sub.2 and may be laden with H.sub.2 S is then regenerated in that the said absorption liquid is let down in one or more let-down stages and a let-down gas is taken off at the top of the first let-down stage or, in the case of a plurality of let-down stages, at the top of one or more of the first to penultimate let-down stages, and the partially regenerated absorption liquid obtained from the last let-down stage is, if required, fed to a stripping zone for further regeneration, one or more acid gas streams which contain the CO.sub.2 and may contain H.sub.2 S being removed from the regeneration stage and the regenerated absorption liquid being recycled to the absorption zone, wherein a bleed stream of completely or partially regenerated absorption liquid is fed to one or mor…