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Removing sulphur oxides from a fluid stream

United States Patent

April 8, 2014
View the Complete Patent at the US Patent & Trademark Office
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.
Katz; Torsten (Neustadt, DE), Riemann; Christian (Altrip, DE), Bartling; Karsten (Neustadt, DE), Rigby; Sean Taylor (Houston, TX), Coleman; Luke James Ivor (Durham, NC), Lail; Marty Alan (Raleigh, NC)
BASF SE (DE), Research Triangle Institute (Research Triangle Park, NC)
13/ 782,290
March 1, 2013
STATEMENT OF GOVERNMENT LICENSE RIGHTS This invention was made with U.S. government support under Contract No. (DE-AR0000093) awarded by the Department of Energy. The U.S. Government has certain rights in this invention.