procedure for the conversion or reduction of sulphur dioxide to elementary sulphur

摘要

A flue gas stream containing SO2 and other sulfur compounds is contacted with an absorber flowing in a closed loop and the sulfur compounds then desorbed. The desorbed sulfur compounds are burned with methane to produce elemental surfur and the combustion products washed with water. Elemental sulfur is separated from the water wash. Preferably, the absorbent is a piperazinone or an alkyl substituted piperazinone, especially N,N'dimethylpiperazinone. Carbon dixoide readily can be recovered from the cleaned flue gas."