PROCESS AND APPARATUS FOR DESULFURIZING GAS MIXTURES

摘要

The invention relates to a process for desulfurizing a gas mixture containing H2S and CO2 by means of selective absorption of the H2S into a basic absorbent and subsequent oxidation of the H2S absorbed with an oxidizing agent, which is characterized in that i) a combustible biogas containing H2 and/or CH4 is used as the gas mixture to be desulfurized; ii) after the absorption step a phase separation step is conducted to separate the liquid phase in the form of the sulfide-enriched absorbent from the gas phase containing the combustible gas components; and iii) the liquid phase thus degassed is contacted with an oxidizing agent in order to oxidize the sulfide to elemental sulfur and/or higher oxidation states of sulfur.