| 摘要 |
A process for desulfurization of a gaseous substrate containing O2, SO2, SO3, H2SO4, H2S, CS2, COS and/or organic sulfur-containing components. The combustible components are oxidized catalytically into H2O, CO2, and SO2. The SO2 is further oxidized catalytically into SO3, which in the presence in the substrate of at least an equivalent amount of H2O 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 DEG C. The temperature of the gas stream leaving the towers is at least 50 DEG C. below the H2SO4 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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