The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1994
Filed:
Aug. 24, 1992
Leslie C Hardison, Barrington, IL (US);
ARI Technologies, Inc., Schaumburg, IL (US);
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.