Process for separating so.sub.2 from a current of gas containing the same, and plant for carrying out such process

Abstract From the Canadian patent

A process for separating SO2 from a current of gas containing the same, at least intermittently, in a concentration which is permissibly high for discharge into the ambient atmosphere with attendant production of sulfuric acid by the nitrogen oxide process is described. In the novel process the SO2-, containing gas initially flows either through a denitration zone, or through a pretreatment zone constituting a first sector of an SO2-processing zone, and then through the said denitration zone, thereafter through the main sector of the SO2-processing zone, and subsequently through a nitrogen oxide absorption zone, the current of the gas being brought into contact in at least one of the two …