Acid gas scrubbing methods featuring amine phase separation for hydrogen sulfide capture

US12325004B2 · kind B2 · utility

Assignee

• Exxon Mobil Technology and Engineering Company · US

Inventors

• Carla S. Pereira · Somerville, US
• Jenny P. Seagraves · Spring, US
• P. Scott Northrop · Diemelstraße, US
• Michael Siskin · Dover, US
• Thomas Ingram · Keller, US
• Gerald Vorberg · Ludwigshafen, DE
• Martin Ernst · Ludwigshafen am Rhein, DE
• Georg Sieder · Bad Dürkheim, DE

Key dates

• Filing date: Jul 6, 2021
• Grant date: Jun 10, 2025
• Expiry date: Jul 6, 2041

Classification

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

Abstract

Capture of hydrogen sulfide from a gas mixture may be accomplished using an aqueous solution comprising an amine. Certain sterically hindered amines may selectively form a reaction product with hydrogen sulfide under kinetically controlled contacting conditions and afford a light phase and a heavy phase above a critical solution temperature, wherein the hydrogen sulfide may be present in either phase. Upon separation of the light phase from the heavy phase, processing of one of the phases may take place to remove hydrogen sulfide therefrom. Recycling of the amine to an absorber tower may then take place to promote capture of additional hydrogen sulfide.