Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Patent
1998-12-07
2000-12-26
Griffin, Steven P.
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
4235765, 4235766, 4235767, 481277, C10L 310
Patent
active
061654361
ABSTRACT:
A process is provided for removing hydrogen sulfide out of a gas, such as natural gas. The hydrogen sulfide contaminated gas is contacted with a catalytic aqueous solution containing a polyvalent metal chelating agent under conditions in which the hydrogen sulfide is oxidized into elemental sulfur and the polyvalent metal chelating agent is reduced to a lower oxidation state, and the treated gas is recovered. The solution containing the polyvalent metal chelating agent and the elemental sulfur is filtered at a pressure of at least 1 Mpascals. At least a portion of the filtered solution containing the polyvalent metal chelating agent is degassed and/or depressurized for the removal of components such as light hydrocarbons and carbon dioxide; contacted with an oxidizing agent and recycled back to the hydrogen sulfide removal step. By filtering the sulfur out of the solution at a pressure of at least 1 Mpascal, foam formation and clogging problems can be avoided.
REFERENCES:
patent: 4011304 (1977-03-01), Mancini et al.
patent: 4859437 (1989-08-01), Grinstead et al.
patent: 5096691 (1992-03-01), Bedell et al.
Kohl et al. "Gas Purification" 4th Edition, Gulf Publishing Co. Houston TX ISBN 0-87201-314-6, pp. 515-517, 1985.
Special Report: "Gas Process Handbook '92: Sulferox", Hydrocarbons Processing, vol. 71, No. 4, Apr. 1992, p. 134.
Dezael Claude
Lecomte Fabrice
Queyrel Jacques
Griffin Steven P.
Institut Francais du Pe'trole
Le Gaz Integral
Vanoy Timothy C
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