Removing sulphur oxides from a fluid stream

Marty Alan Lail; Luke James Ivor Coleman; T Katz; C Riemann; K Bartling; ST Rigby; Luke James Ivor Coleman; Marty Alan Lail

Removing sulphur oxides from a fluid stream

Katz, T., Riemann, C., Bartling, K., Rigby, ST., Coleman, L., & Lail, M. (2014). Removing sulphur oxides from a fluid stream. (U.S. Patent No. 8691171). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=8691171

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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.