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The Advantages and Disadvantages of Preparing Sodium P-Toluenesulfonate with Concentrated Sulfuric Acid

Before studying the advantages and disadvantages of preparing Sodium P-toluenesulfonate with concentrate sulfuric acid, let us introduce some information about Sodium P-toluenesulfonate:
  Sodium P-toluenesulfonate is white crystalline powder. It can be used in slurry conditioning agent of synthetic detergents. After sodium toluene sulfonate is put into synthetic detergent powder, of which all the index can meet the stipulated criterion.
  Sodium P-toluenesulfonate manufacture can be divided into two procedures: Toluene can be acted as raw material, after sulfonation, generating Para-toluenensulfonic Acid PTSA; P-toluenensulfonic Acid and liquid caustic soda carry out neutralization reaction, yielding crude Sodium P-toluenesulfonate. After bleaching, concentration, crystallization and centrifugation, fine product could be obtained. There is another method: Toluenesulfonyl chloride hydrolysis. In particular, the hydrolysis temperature must be controlled strictly to avoid washing the material; The hydrolysis reaction should be carried out under alkali condition. With the temperature going up, the hydrolysis reaction rate speed up. Under room temperature, the reaction is slow. Above 50℃,the speed accelerated significantly.
  Advantages of preparing Sodium P-toluenesulfonate with concentrate sulfuric acid:
The raw material is easy to be obtained and at low price.
Avoiding the troubles of using chlorosulfonic acid, oleum and other sulfonating agents. Reducing the environmental pollution.
Easily operated and suitable reaction temperature.
  Disadvantages of preparing Sodium 4-toluenesulfonate with concentrate sulfuric acid:
Concentrated sulfuric acid’s sulfonation effectiveness is relatively weak compared with chlorosulfonic acid, oleum and other sulfonating agents. The rate is slower, temperature is relatively high and yield is lower.
Since too many concentrated sulfuric acid is used, it has some difficulty in separating Sodium P-toluenesulfonate.