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Sulphonation of benzene with sulphur trioxide in the gas-phase

✍ Scribed by P. M. Heertjes; H. C. A. van Beek; G. I. Grimmon

Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 573 KB
Volume: 80
Category: Article
ISSN: 0165-0513
DOI: 10.1002/recl.19610800109

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✦ Synopsis

Abstract

The reaction of gaseous sulphur trioxide with gaseous benzene has been studied at three different temperatures with different ratios of the reactants. The reactions are rapid. The number of products can be rather large and depends on the ratio of sulphur trioxide to benzene.

At low ratios (up to 1.2) diphenylsulphone, benzene‐monosulphonic acid and benzene pyrosulphonic acid are formed, at higher ratios also more highly sulphonated products are obtained.

The amount of sulphonic acid groups increases proportionally to this ratio. It is concluded that diphenylsulphone is formed via the intermediate product, benzenepyrosulphonic acid, because the presence of acetic acid reduced the amount of sulphone proportionally. The temperature – between 100 and 230° ‐ had no marked influence on the results.

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