Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1992-08-24
1994-02-15
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
606412, 210718, 210721, 210750, 210763, 4235731, C02F 174
Patent
active
052863891
ABSTRACT:
Sour water is treated to remove dissolved hydrogen sulfide by means of an aqueous, non-chelated polyvalent metal solution in a continuous recirculating system, particularly an autocirculation system, having reaction and oxygenation zones. The solution contains a small catalytic amount of polyvalent metal, e.g., ferrous or ferric iron salts, and the dissolved hydrogen sulfide is oxidized to sulfur in the liquid phase, without chelating agent solution, by means of dissolved oxygen in the solution. The sour water feed to the reaction zone is diluted by a massive recycle of oxygenated solution from the oxygenation zone before the sour water is contacted with air or other oxidizing gas used for oxygenating the used solution. A portion of the oxygenated solution containing polyvalent metal, without added chelating agent, is removed as the sweet water product, and replacement polyvalent metal is added. The operating variables are controlled to maintain in the solution a predetermined polyvalent metal content and an effective dissolved oxygen content, and also to maintain a predetermined residence time so as to obtain high efficiency of hydrogen sulfide removal.
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Ari Technologies, Inc.
Hruskoci Peter A.
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