The properties of sodium p-toluene sulfonate are: white flaky crystals, usually two water crystals, soluble in water (20 67g, 80 260g), soluble in methanol, and soluble in most organic solvents. The solution of 20g/L is pH=8-10. The melting point is >300 C, and the flash point is >500 C. General by toluene as the raw material, obtained by sulfonation, methyl benzene sulfonic acid, and then prepared the crude liquid alkali neutralization, decoloring, concentration, crystallization, centrifugation of finished products; and also by p-toluenesulfonyl chloride hydrolyzing (must strictly control the hydrolysis temperature, prevent the blanking; hydrolysis under alkaline conditions the temperature raise. The hydrolysis speed at room temperature. Water solution is slow, 50 DEG C hydrolysis speed).