B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/34 (2006.01) B01D 53/14 (2006.01) B01D 53/60 (2006.01)
Patent
CA 2093901
2093901 9303825 PCTABS00020 The simultaneous abatement of NO and SO2 in flue gas is provided by an absorption process and apparatus utilizing an absorbent composition comprising an aqueous solution of chelates and sulfite salt for NO abatement and amine SO2 absorbents such as piperazinones, morpholinones, piperidines, piperazines, piperazinediones, hydantoins, triazinones, pyrimidinones, oxazolidones, etc. for SO2 abatement. SO2 is thermally stripped from the spent absorbent and recovered. Metal chelates oxidized to an inactive state as a side-reaction are electrochemically reduced. An anionic exchange membrane in the electrochemical cell regenerates heat stable amine salt byproducts to be converted back to useable amine sorbent, and facilitates removal from the absorbent solution of other waste salts.
Bedell Stephen A.
Chang Dane
Kirby Larry H.
Smart & Biggar
The Dow Chemical Company
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