Absorbent and process for selectively removing hydrogen sulfide

US11458433B2 · kind B2 · utility

Assignees

• BASF SE
• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• Martin Ernst · Ludwigshafen am Rhein, DE
• Gerald Vorberg · Ludwigshafen, DE
• Thomas Ingram · Keller, US
• Georg Sieder · Bad Dürkheim, DE
• Carla S. Pereira · Somerville, US

Key dates

• Filing date: Aug 30, 2018
• Grant date: Oct 4, 2022
• Expiry date: May 18, 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 over carbon dioxide from a fluid stream, wherein the absorbent contains an aqueous solution, comprising an amine of formula (I) and/or an amine of formula (II) wherein U—V—W is CH—O—CHR5, N—CO—CHR5 or N—CO—NR5; U′—V′—W is C—O—CR5; R1 is independently C1-C5-alkyl; R2 is selected from hydrogen and C1-C5-alkyl; R3 is independently selected from hydrogen and C1-C5-alkyl; R4 is independently selected from hydrogen and C1-C5-alkyl; R5 is selected from hydrogen, C1-C5-alkyl, (C1-C5-alkoxy)-C1-C5-alkyl, and hydroxy-C1-C5-alkyl; and x is an integer from 1 to 10. 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 a low volatility in aqueous solvents.