{HEAD ~ A method} of removing {TAIL ~ SO2} from a gas stream containing the same by absorbing the SO2 in an aqueous solution containing a 4 2 piperazinone compound or an alkyl or aryl substituted derivative thereof 
of removing
{ HEAD ~ A method } of removing { TAIL ~ SO2 } from a gas stream containing the same by absorbing the SO2 in an aqueous solution containing a 4 2 piperazinone compound or an alkyl or aryl substituted derivative thereof
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH