Catalyst and process for oxidation of sulphur dioxide
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United States of America Patent
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Feb 18, 2003
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N/A
app pub date -
Nov 7, 2000
filing date -
May 14, 1998
priority date (Note) -
Expired
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Abstract
A process for the recovery of sulphur trioxide, solutions of sulphuric acid, or organic derivatives thereof, using organic compounds and/or supercritical fluids, and catalyst. The process comprises the steps of passing a mixture of SO.sub.2 and an oxygen-containing gas over an activated carbon catalyst at a temperature of at least 15.degree. C. and preferably at a pressure of 1-200 atmospheres, and stripping the activated carbon with either (i) a liquid organic compound selected from the group consisting of ketones, ethers, decalin, tetrahydrofurans, sulpholanes, glymes and formamides and which is non-reactive with sulphur trioxide or sulphuric acid, or (ii) a liquid organic compound capable of forming organic sulphates or sulphonates by reaction with sulphur trioxide or sulphuric acid. The process may be used to obtain sulphuric acid, or organic sulphates or sulphonates.
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