B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/14 (2006.01) B01D 53/50 (2006.01) C10K 1/14 (2006.01)
Patent
CA 2049151
Sulfur dioxide is removed from a fluid containing SO2 by employing as an absorbent for the SO2 an aqueous solution of a compound represented by Formulas I, II or III. Where Formula I is: (see formula I) wherein each Y is independently -(CR22)- or -(CR2)= and each R1 or R2 is independently hydrogen, an alkyl group; an hydroxyalkyl group; an aldehyde group; a carboxylic acid group or salt thereof; an alkyl group containing at least one carboxylic ester, a carboxylic acid or salt thereof, ether, aldehyde, ketone, or sulfoxide group; wherein the compound has at least one carbonyl group. Formula II is: Image wherein each R3 is independently hydrogen; an alkyl group; a hydroxyalkyl group; an aldehyde group; a carboxylic acid or salt group; or an alkyl, aryl, or aralkyl group containing at least one carboxylic ester, a carboxylic acid or salt, ether, aldehyde, ketones or sulfoxide group. The absorbent solution preferably can be thermally regenerated by heating to remove SO2, Formula III is: Image wherein each R6 or R5 is independently hydrogen; an alkyl group; a hydroxyalkyl group; an aldehyde group; a carboxylic acid or salt group; an alkyl group containing at least one carboxylic ester, carboxylic acid or salt, ether, aldehyde, ketone or sulfoxide; and wherein at least one R6 or R5 is a carbonyl-containing group, such as an aldehyde group, a carboxylic acid containing group; a carboxyl ester group, or a ketone-containing group. The absorbent solution preferably can be thermally regenerated by heating to remove SO2.
Chang Dane
Christiansen Steven H.
Crump Druce K.
Smart & Biggar
The Dow Chemical Company
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