PROCESS FOR REMOVING H2S FROM GAS STREAM BY CALCIUM BASED REACTION SEPARATION

摘要

There are provided processes for removing H2S from a gas. The processes comprise contacting the gas with an aqueous composition comprising at least one calcium compound, thereby obtaining CaS and a H2S lean treated gas stream, while maintaining the pH at about 9.5 to about 13.0; and contacting the CaS with an aqueous oxidant solution, converting the CaS into at least one of CaS03 and CaS04, while maintaining the pH at about 9.5 to about 13.0.