Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Sulfur or sulfur containing component
Patent
1997-12-31
2000-11-21
Griffin, Steven P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Sulfur or sulfur containing component
42324409, 423522, 423529, 423542, B01D 5348, C01B 1774
Patent
active
061498866
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.
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Griffin Steven P.
Haldor Topsoe A/S
Vanoy Timothy C
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