In this article, we can conclude that oleum with a high content of sulfur dioxide should be used for sulfation to increase the content of practically valuable m-isomers in mixtures. However, oleum containing 33-54% free SO3 is practically unsuitable for sulfonation due to its high crystallization temperature. In addition, high resin content has been reported in oleum containing over 50% free SO3 when mixed with H-alkylanilines.
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