Patent ID: 6800269
Filing Date: 2004-10-05
Classification: B01D,B01J,C01B,Y02P

Abstract:
A waste gas desulfurization process comprising:providing a H2S-containing waste gas stream; providing a O2-containing stream; in a millisecond contact time reactor having a gas mixing zone, a reaction zone, and a cooling zone, mixing together said H2S-containing gas stream and said O2-containing gas stream in said mixing zone to form a reactant gas mixture, said reaction zone containing a catalyst device having activity for catalyzing the partial oxidation of H2S to elemental sulfur and water; maintaining the temperature of said reaction zone above 300Â° C.; passing said reactant gas mixture over said catalyst device such that the contact time between said catalyst device and a portion of said reactant gas mixture that contacts said catalyst device is sufficiently brief to allow the reaction H2S+Â½O2â†’1/x Sx+H2O (x=2, 6 or 8) to occur, and a product gas stream is formed comprising gaseous elemental sulfur and water; passing said product gas stream into said cooling zone and cooling said product stream to a temperature above the dewpoint of sulfur, to provide a partially cooled product stream; passing said partially cooled product stream into a sulfur condenser and further cooling said partially cooled product stream to the dewpoint temperature of elemental sulfur, or lower wherein at least the reaction zone of said reactor is capable of withstanding temperatures of at least 1500Â° C., said H2S-containing gas stream and said O2-containing gas stream are combined in said mixing zone to form a reactant gas mixture having a molar ratio of H2S to O2 of about 2:1 or less and the temperature of said reaction zone is 700-1,500Â° C.