METHOD OF REMOVING SULFUR COMPOUNDS FROM RESIDUAL GAS Russian patent published in 1998 - IPC

FIELD: gas treatment. SUBSTANCE: invention, in particular, relates to effluent gases from Claus-method sulfur production. It consists in subjecting gas to combined hydrogenation and hydrolysis at 140-550 C in presence of catalyst to form hydrogen sulfide. Gas mixture is then cooled to a temperature between dew point of water vapor contained in the gas and 185 C to oxidize hydrogen sulfide at that temperature by oxygen-containing gas taken in amount providing O₂/H₂S molar ratio from 0.5 to 3 in presence of catalyst for selective oxidation of hydrogen sulfide to sulfur. Gas-catalyst contact time in the oxidation stage ranges from 0.5 to 20 s. Active phase of catalyst contains at least one oxide and/or salt of transition metals (Ni, Co, Fe, Cu, Ag, Mn, Mo, Cr, W, V) on carrier: bauxite, titanium, aluminum, Iridium or silicon oxide, zeolite, or activated carbon. EFFECT: improved selectivity of hydrogen sulfide oxidation. 12 cl, 1 dwg