Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1978-01-30
1978-11-07
Peters, G. O.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
423575, C01B 1700
Patent
active
041246853
ABSTRACT:
Hydrogen sulfide is substantially completely removed from a sulfur bearing industrial gas stream by absorbing the H.sub.2 S into a liquid absorbent, stripping the absorbent of absorbed H.sub.2 S and reacting it with SO.sub.2 in a ratio of H.sub.2 S/SO.sub.2 greater than the stoichiometric ratio of 2.0:1.0 to produce elemental sulfur and water, leaving a tail 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 greater than 160.degree. C. The excess H.sub.2 S assures complete reduction at these temperatures of all SO.sub.2 to elemental sulfur. The remaining excess H.sub.2 S is then recycled in the tail gas back into the original industrial gas stream prior to the point of contact of the industrial gas stream with the liquid absorbing solution.
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Kwasnoski Daniel
Tarhan Mehmet O.
Leach Michael
O'Keefe Joseph J.
Peters G. O.
Wilkinson Charles A.
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