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The synthesis methods of p-toluenesulfonic acid

Sulfonation agent used in sulfonation reaction: fuming sulfuric acid, sulfuric acid, sulfur oxide, sulphur dioxide, chlorosulfonic acid, thionyl chloride, sulfite, and so on. Sulfonation of toluene sulfonation agent used mainly with p-toluene sulfonic acid with sulfuric acid, sulfur trioxide, chlorosulfonic acid . synthesis methodsof p-toluene sulphonic acid :sulfuric acid, sulfur trioxide sulfonation law law, chlorosulfonic acid sulfonation of law, with p-toluene sulfonic acid of ammonia solution, they have their own characteristics.
Sulfonation of toluene sulfuric acid, is the most used and the oldest process technology. The sulfonation reaction process is as follows:
Sulfonation reaction rate is proportional to the concentration of toluene and sulfuric acid is inversely proportional to the square of the water content, so the need to use the moisture content of less sulfuric acid and high purity toluene, but the sulfonation reaction is a reversible reaction lmol per consumption of sulfuric acid to generate the lmol the waterthe concentration of water is gradually increased with the reaction, the final balance, produce large amounts of waste acid.Industrial production, the partial pressure distillation method is commonly used to get rid of the sulfonation reaction of water, so that the sulfonation reaction completely.
Sulfuric acid as sulfonating agent, the advantages are: due to the low price of sulfuric acid with a certain degree of market competitiveness , the production process is simple, low investment on equipment, easy to operate and so on, suitable for small scale production equipment. But this process of low response rates, low purity of the product, reaction going on with the formation of water, drop of sulfuric acid concentration, when the 95% is reached (PI value is 75%), the reaction stops, produce large amounts of waste acid, serious pollution environment. The latest research shows that using the additive method may be appropriate to improve product quality and reaction yield.