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Producing P-toluenesulfonic acid(PTSA) In Sulfnric Acid Sulfonation Method

Para-toluenesulfonic acid(PTSA) properties and application: white needle or powder crystalline; soluble in water, alcohol, ether; deliquescent easily; make cotton fabric, wood, paper dehydrated and carbonized; insoluble in Benzene, Toluene, Xylene and other Benzene series solvents. Alkali fusion generated P-cresol. The production is hydrolyzing P-toluenesulfonyl chloride. Besides, it could also take Toluene as raw material, through sulfuric acid sulfonation. Storage and transportation condition: low-temperature drying treasury ventilation, far way from alkali. P-toluenesulfonic acid(PTSA) is widely used in synthesis of pharmaceuticals, pesticides, stabilizers of polymerization reaction and catalysts of organic synthesis (esters, etc.), acts as pharmaceuticals, paints intermediates, resin curing agent and plating intermediates. Producing PTSA in sulfuric acid sulfonated method : the sulfonation reaction rate is directly proportional to the concentration of toluene , and inversely proportional to the square of the water content of sulfate. Thus, aqueous sulfuric acid and a high purity toluene were workable in the reaction. But the sulfonation reaction is reversible reaction, the consumption per lmol sulfuric acid to generate the lmol the water, the concentration of water with the reaction proceeded gradually increased , and finally reach the balance produce large amounts of waste acid . Industrial production , the general use of the partial pressure distillation to rid the sulfonation reaction of the water , so that the sulfonation reaction was complete .
The advantages with sulfuric acid as sulfonating agent are: low price sulfuric acid is competitive in the market; the production process is simple, low investment in equipment, easy to operate, suitable for small-scale production plant. However, the yield is low. Production purity is low. With the water generating through the reaction, the concentration of benzensulfuric acid decreased. When up to 95% (π value is 75% ) , the reaction was stopped , to produce large amounts of waste acid , serious pollution environment. The latest research shows that the method may be appropriate to add additives to improve product quality and reaction yield .