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:
Oct. 19, 1976
Filed:
Sep. 17, 1973
Alvin B Stiles, Wilmington, DE (US);
E. I. Du Pont de Nemours & Company, Wilmington, DE (US);
Abstract
The invention is directed to an integrated process for reducing the SO.sub.2 content of sulfuric acid plant off gases by (1) passing the SO.sub.2 -containing feed gas to the process over a specially defined multistage oxidation catalyst to convert SO.sub.2 to SO.sub.3, (2) absorbing the SO.sub.3 in water to form H.sub.2 SO.sub.4 and (3) scrubbing the off gases with aqueous hydrogen peroxide and/or sulfur-containing peroxy acids. At least the final oxidation stage of the process employs a supported CsVO.sub.3 or RbVO.sub.3 catalyst which is activated with cobalt or nickel sulfate and promoted with alkali metal sulfates, potassium aluminum sulfate or chromium potassium sulfate.