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:
May. 12, 1981
Filed:
Oct. 04, 1979
Emmett H Burk, Jr, Glenwood, IL (US);
Jin S Yoo, Flossmoor, IL (US);
John A Karch, Chicago, IL (US);
Jui-Yuan Sun, South Holland, IL (US);
Atlantic Richfield Company, Philadelphia, PA (US);
Abstract
Disclosed is an aqueous phase oxidation for removing at least a portion of metal contaminants such as nickel, vanadium, iron or copper from a catalyst used in a hydrocarbon conversion process. The aqueous phase oxidation comprises: contacting a sulfided metals contaminated catalyst with an aqueous solution comprising soluble metal nitrate ions and a catalytically effective concentration of nitrite ions. Optionally, the sulfided catalyst which has been oxidized can be further treated with an aqueous oxidative and/or reductive wash. The oxidative wash preferably follows the reductive wash for optimal results.