Process for increased selectivity and capacity for hydrogen sulfide capture from acid gases

US12053738B2 · kind B2 · utility

Assignees

• Exxon Mobil Technology and Engineering Company · US
• BASF SE

Inventors

• Carla S. Pereira · Somerville, US
• Michael Siskin · Dover, US
• Thomas Ingram · Keller, US
• Gerald Vorberg · Ludwigshafen, DE
• Martin Ernst · Ludwigshafen am Rhein, DE

Key dates

• Filing date: Nov 30, 2021
• Grant date: Aug 6, 2024
• Expiry date: Nov 30, 2041

Classification

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

Abstract

A process for selectively separating H2S from a gas mixture which also comprises CO2 is disclosed. A stream of the gas mixture is contacted with an absorbent solution comprising one or more amines, alkanolamines, hindered alkanolamines, capped alkanolamines, or mixtures thereof. The H2S/CO2 selectivity of the absorbent solution is preferably greater than about 4.0 for an acid gas loading [mol(CO2+H2S)/mol(amine)] between about 0.2 and about 0.6, and is achieved by reducing pH of the absorbent solution.