Removing sulphur oxides from a fluid stream

US8691171B2 · kind B2 · utility

Assignees

• BASF SE
• Research Triangle Institute · US

Inventors

• Torsten Katz · Ludwigshafen am Rhein, DE
• Christian Riemann · Ludwigshafen, DE
• Karsten Bartling · Neustadt, DE
• Sean Taylor Rigby · Houston, US
• Luke Coleman · Durham, US
• Marty Lail · Темневкий пруд, US

Key dates

• Filing date: Mar 1, 2013
• Grant date: Apr 8, 2014
• Expiry date: Mar 1, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/507
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for removing sulphur oxides from a fluid stream, such as flue gas, comprising: providing a non-aqueous absorption liquid containing at least one hydrophobic amine, the liquid being incompletely miscible with water; treating the fluid stream in an absorption zone with the non-aqueous absorption liquid to transfer at least part of the sulphur oxides into the non-aqueous absorption liquid and to form a sulphur oxide-hydrophobic amine-complex; causing the non-aqueous absorption liquid to be in liquid-liquid contact with an aqueous liquid whereby at least part of the sulphur oxide-hydrophobic amine-complex is hydrolyzed to release the hydrophobic amine and sulphurous hydrolysis products, and at least part of the sulphurous hydrolysis products is transferred into the aqueous liquid; separating the aqueous liquid from the non-aqueous absorption liquid. The process mitigates absorbent degradation problems caused by sulphur dioxide and oxygen in flue gas.