Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1992-11-04
1995-02-14
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
42324409, 423220, 423222, 4235742, 423575, 423230, C01B 1704, C01B 1716
Patent
active
053893514
ABSTRACT:
A foul gas containing H.sub.2 S is brought into the presence of SO.sub.2 in a first stage to permit the reaction between SO.sub.2 and H.sub.2 S to form water and elemental sulfur. The SO.sub.2 is solubilized in an absorbent composition which includes a solvent for both SO.sub.2 and H.sub.2 S so that the H.sub.2 S in the foul gas is first solubilized in the absorbent composition where it is then brought into contact with the solubilized SO.sub.2 for reaction between a major portion of the H.sub.2 S and the solubilized SO.sub.2 to form elemental sulfur. The gas is then passed to a second stage where any remaining H.sub.2 S is removed by aqueous catalytic reaction of the type conventional in the prior art. The apparatus utilized to carry out the present invention preferably includes a two stage column in which the first stage provides the absorbent material containing solubilized SO.sub.2 for reaction with the H.sub.2 S of the foul gas. During the SO.sub.2 extraction stage the major portion of the H.sub.2 S is removed from the foul gas. The gas is then conveyed from the first stage to a second stage which comprises a conventional aqueous catalytic scrubbing operation where the remainder of the H.sub.2 S is removed. The absorbent composition utilized in the process comprises solvents that dissolve SO.sub.2 and/or H.sub.2 S which can be heated to a temperature above the melting point of sulfur without detrimentally affecting the solvent so that it may be recycled through the system.
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Hasebe Nobukatsu
Hasebe Nobuyasu
Straub Gary P.
Vanderburgh John E.
Vanoy Timothy C.
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