Absorbent and process for selectively removing hydrogen sulfide

US11241652B2 · kind B2 · utility

Assignees

• BASF SE (REITSTÖTTER, KINZEBACH & PARTNER) · DE
• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• Martin Ernst · Ludwigshafen am Rhein, DE
• Gerald Vorberg · Ludwigshafen, DE
• Georg Sieder · Bad Dürkheim, DE
• Thomas Ingram · Keller, US
• Virginia M. Reiner · Summit, US
• Carla S. Pereira · Somerville, US
• Michael Siskin · Dover, US

Key dates

• Filing date: May 14, 2018
• Grant date: Feb 8, 2022
• Expiry date: Jan 20, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02C20/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

An absorbent for the selective removal of hydrogen sulfide from a fluid stream comprising carbon dioxide and hydrogen sulfide, wherein the absorbent contains an aqueous solution, comprising: a) an amine or a mixture of amines of the general formula (I) wherein R1 is C1-C5-alkyl; R2 is C1-C5-alkyl; R3 is selected from hydrogen and C1-C5-alkyl; x is an integer from 2 to 10; and b) an ether or a mixture of ethers of the general formula (II): R4—[O—CH2—CH2]y—OH; wherein R4 is C1-C5-alkyl; and y is an integer from 2 to 10; wherein R1 and R4 are identical; wherein the mass ratio of b) to a) is from 0.08 to 0.5. The absorbent is suitable for the selective removal of hydrogen sulfide from a fluid stream comprising carbon dioxide and hydrogen sulfide. The absorbent has a reduced tendency for phase separation at temperatures falling within the usual range of regeneration temperatures for the aqueous amine mixtures and is easily obtainable.