Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Reexamination Certificate
2007-04-20
2008-09-02
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
C423S576200, C423S576400, C423S576500, C423S576600, C423S576700
Reexamination Certificate
active
07419652
ABSTRACT:
The invention relates to a process for removing hydrogen sulfide and recovering sulfur from a gas stream, comprising the steps of: contacting said gas stream with an aqueous catalyst solution of a polyvalent metal redox catalyst in a contacting zone to absorb said hydrogen sulfide and form a reduced catalyst solution comprising reduced polyvalent metal redox catalyst and sulfur particles; oxidizing said reduced catalyst solution while removing sulfur particles to form said oxidized aqueous catalyst solution comprising polyvalent metal redox catalyst in an oxidized state with sulfur particles removed; and recovering sulfur by transferring at least one of said sulfur particles and foam to a separation zone; wherein a coagulating reagent is added to a feed of said separation zone prior to entering said separation zone to promote settlement of sulfur particles.
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Forsat Khaled
Hashemi Reza
Hossein Manafi Varkiani
Khattaty Mohammad Reza
Kenyon & Kenyon LLP
Research Institute of Petroleum Industry (RIPI)
Vanoy Timothy C
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