Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1990-06-01
1991-04-02
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
23293S, 4235766, C01B 1716, C01B 1702, C01B 3120
Patent
active
050045881
ABSTRACT:
This invention provides a process for removing H.sub.2 S from the gaseous stream by contacting the stream with an aqueous solution of a water soluble oxidized polyvalent metal chelate catalyst in the presence of oxygen whereby the metal chelate catalyst oxidizes the hydrogen sulfide to produce elemental sulfur and the oxygen present oxidizes the reduced metal chelate catalyst to its oxidized form. This process is performed in a single reaction vessel and forms a suspension or slurry of the precipitated elemental sulfur which is maintained in suspension by the use of a dispersing agent. The process is continued until the sulfur content reaches a level of 5 percent by weight or 10 percent or more by weight of the solution, then the entire solution is discarded and replaced with a fresh solution and the process repeated. This invention also provides a composition for H.sub.2 S removal comprising a polyvalent metal chelate catalyst, a buffer and a dispersing agent. The dispersing agent preferably keeps the particle size of the precipitated sulfur as small as possible, for example, less than about 15 microns and preferably less than about 5 microns.
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Fong et al., "Shell Redox Desulfurization Process Stresses Versatility", Oil and Gas Journal, (OGJ Report), 5/25/87, pp. 54-62.
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Nisula Scott P.
O'Callaghan Christopher P.
Chevron Research & Technology Company
Cuomo Lori F.
Straub Gary P.
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