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:
Nov. 21, 2000
Filed:
Dec. 31, 1997
Peter Schoubye, Horsholm, DK;
Haldor Topsoe A/S, Lyngby, DK;
Abstract
A process for desulfurization of a gaseous substrate containing O.sub.2, SO.sub.2, SO.sub.3, H.sub.2 SO.sub.4, H.sub.2 S, CS.sub.2, COS and/or organic sulfur-containing components. The combustible components are oxidized catalytically into H.sub.2 O, CO.sub.2, and SO.sub.2. The SO.sub.2 is further oxidized catalytically into SO.sub.3, which in the presence in the substrate of at least an equivalent amount of H.sub.2 O in the gas, is further hydrated and condensed as sulfuric acid. The process is conducted in two towers that are connected in series, each tower being loaded with a layer of inert material below a layer of oxidization catalyst preferably consisting of an acid resistant material with parallel, vertical channels. A preferred catalyst includes vanadium oxide supported on a silica carrier material and promoted with alkali metals. The process includes reversing a direction of gas flow in the towers after periods of about 1-40 minutes. The temperature in layers of the oxidation catalyst, preferably consisting of an acid resistant material with parallel, vertical channgels in the towers is maintained in a range of 300-500.degree. C. The temperature of the gas stream leaving the towers is at least 50.degree. C. below the H.sub.2 SO.sub.4 dew point of the process gas after oxidation of the sulfur content in the feed gas. Condensed sulfuric acid is drained off from the bottom of each of the towers.