SIMULTANEOUS REMOVAL OF SO2 AND H2S FROM EXHAUST GASES

摘要

Process for a simultaneous removal of SO2 and H2S from exhaust gases in which the exhaust gases are contacted in a first stage in a countercurrent operation with a first suspension, which contains 60 to 95 g/l ZnSO3, 80 to 90 g/l ZnO, and 0.1 to 1.0 g/l ZnS. 40 to 60% by volume of the suspension collected in the sump of the first stage are recycled and are re-supplied to the first stage at its top. The exhaust gas which has been depleted of SO2 and H2S is contacted in a second stage in a countercurrent operation with a second suspension, which contains 80 to 150 g/l ZnO, and with a third suspension, which contains 60 to 95 g/l ZnSO3, 80 to 90 g/l ZnO, and 0.1 to 1.0 g/l ZnS 40 to 60% by volume of the suspension which as been collected in the sump of the secnd stage are recycled and are re-supplied as the third suspension to the second stage at its top. The pure gas is withdrawn from the second stage at its top.