Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1997-12-26
2000-01-25
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
423224, 42324303, 423544, B01D 5352
Patent
active
06017501&
ABSTRACT:
A process is provided for disposing of hydrogen sulfide contained in a gas stream, wherein a first gas feed stream having a hydrogen sulfide gas component, a second gas feed stream having an oxygen gas component, and an aqueous liquid feed stream are combined to form a reaction mixture. The aqueous liquid feed stream may be water available in remote oilfield locales, such as produced water, or sea water. The aqueous liquid feed stream may include a significant concentration of preexisting sulfate ions, in which case it is generally desirable to remove the preexisting sulfate ions using membrane separation before mixing the aqueous liquid feed stream with the first and second gas feed streams. The resultant low sulfate liquid may further comprise one or more of the following dissolved ions: Na.sup.+,K.sup.+, Mg.sup.2+, Cl.sup.-, Br.sup.-, HCO.sub.3.sup.-. The reaction mixture is contacted with a catalyst, which is preferably an activated carbon, capable of inducing catalytic oxidation of the hydrogen sulfide gas component to produce sulfate ions. Oxidation of the reaction mixture results in a product mixture substantially free of elemental sulfur and having an aqueous liquid product stream which retains the produced sulfate ions in solution and a gas product stream which is substantially free of hydrogen sulfide. The gas product stream is separated from the aqueous liquid product stream and the two streams are separately disposed. The gas product stream is conventionally disposed by discharge into the atmosphere. The aqueous liquid product stream is conventionally disposed by discharge to the environment.
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Ebel Jack E.
Marathon Oil Company
Straub Gary P.
Vanoy Timothy C
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