Physical and chemical properties: the pure product is a white crystalline solid with a melting point of 124 ~ 125 ºC. The industrial product is white to light yellow crystal, with a melting point of 121 ~ 124 ºC. Vapor pressure at 60 ºC < 10 μ Pa. It is insoluble in water, and its solubility in water at 20 ºC is 0.25g/l. Soluble in benzene, soluble in other organic solvents. Solubility (g / 100m1): benzene > 100, acetone, ethanol and ether 3 ~ 10. Chloroform 1 ~ 10. The product is stable to acid and forms salt in the solution of alkali metal hydroxide and carbonic acid compound.
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