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    • 49. 发明专利
    • PREPARATION OF SURFACE ACTIVE SUBSTANCE
    • JPS61164632A
    • 1986-07-25
    • JP718785
    • 1985-01-17
    • FUJI SEKYU KK
    • HIROYA YOSHIHIROMORITA YAZAEMONOKADA SHINICHIINAGAKI KATSUO
    • B01F17/00C04B24/00C10C3/04
    • PURPOSE:To obtain a surface active substance having a total acid value even in a reduced use amount of nitric acid and suitable for a dispersant for cement, by applying nitric acid oxidation to petroleum or coal heavy hydrocarbon in an inert solvent in the presence of oxygen or air. CONSTITUTION:Heavy hydrocarbon such as asphalt or pitch is ground and finely pulverized to be dispersed in a halogenated aliphatic hydrocarbon type solvent while the resulting dispersion is introduced into an autoclave, and nitric acid and oxygen or air are further introduced into said autoclave to perform reaction at 100-150 deg.C under pressure of 2-10kg/cm G. As the oxidizing agent, nitrogen dioxide or nitrogen monoxide or a mixture of both of them is used in a use amount of 0.02-2pts. on the basis of 100% nitric acid by wt. of 1pts.wt. of the stock material. By this method, a surface active substance with a total acid value of 2.0-5.0mg equivalent/g and solubility of 95% or more and having excellent viscosity reducing effect is obtained eve in a reduced use amount of nitric acid. Further, the generation of waste acid and waste gas as byproducts at the time of reaction is reduced and, further, the product is insoluble in a solvent and, therefore, filtering is well and the surface active substance is excellent from an industrial aspect.