C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/332
C01B 17/04 (2006.01) B01D 53/34 (2006.01)
Patent
CA 1091428
METHOD FOR SUBSTANTIALLY COMPLETE REMOVAL OF HYDROGEN SULFIDE FROM SULFUR BEARING INDUSTRIAL GASES Abstract of the Invention Hydrogen sulfide is substantially completely removed from a sulfur bearing industrial gas stream by absorbing the H2S into a liquid absorbent, stripping the absorbent of absorbed H2S and reacting it with SO2 in a ratio of H2S/SO2 greater than the stoichiometric ratio of 2.0:1.0 to produce elemental sulfur and water, leaving a tall gas containing an excess of hydrogen sulfide but no sulfur dioxide. At least the last stage of the reaction is carried out in a liquid reaction medium at a temperature not i greater than 160° C. The excess H2S assures complete reduction at these temperatures of all SO2 to elemental sulfur. The remaining excess H2S is then recycled in the tall gas back into the original industrial gas stream prior to the point of contact of the industrial gas stream with the liquid absorbing solution. -1-
311236
Kwasnoski Daniel
Tarhan Mehmet O.
Bethlehem Steel Corporation
Smart & Biggar
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