| abstract |
ASSTRACT 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 Formula I: Formula I wherein X is -O-, -NR1-, or -N=; each Y is independently - , -(C=0)-, -O-, -NR1-, -N=, or -C(R2)=; each R1 or R2 is independently hydrogen; an alkyl group; a hydroxyalkyl group; an aldehyde group; a carboxylic acid or salt group; or an alkyl group containing an aldehyde group, a carboxylic acid or salt group, ketone, carboxylic ester, ether, or sulfoxide group; and m is an integer preferably of from 2 to 4. The absorbent solution preferably can be thermally regenerated by heating to remove SO2. 38,041-F |