METHOD FOR SUBSTANTIALLY COMPLETE REMOVAL OF HYDROGEN SULFIDE FROM SULFUR BEARING INDUSTRIAL GASES

摘要

METHOD FOR SUBSTANTIALLY COMPLETE REMOVALOF HYDROGEN SULFIDE FROM SULFUR BEARINGINDUSTRIAL GASESAbstract of the InventionHydrogen sulfide is substantially completelyremoved from a sulfur bearing industrial gas stream byabsorbing the H2S into a liquid absorbent, stripping theabsorbent of absorbed H2S and reacting it with SO2 in aratio of H2S/SO2 greater than the stoichiometric ratio of2.0:1.0 to produce elemental sulfur and water, leaving atall gas containing an excess of hydrogen sulfide but nosulfur dioxide. At least the last stage of the reaction iscarried out in a liquid reaction medium at a temperature noti greater than 160° C. The excess H2S assures completereduction at these temperatures of all SO2 to elementalsulfur. The remaining excess H2S is then recycled in thetall gas back into the original industrial gas stream priorto the point of contact of the industrial gas stream withthe liquid absorbing solution.-1-