| In this paper, in order to study the effect from magnetic fields on the process of extraction with different magnetic flux intensity B magnetic fields and different temperature T, ethanol-water-benzene system,acetic acid-water-benzene system,chloroform-water- acetone system were employed to be magnized. It indicates that magnetic fields doesn't work on the liquid-liquid equilibrium of acetic acid-water-benzene system, the partition coefficient of acetic acid doesn't alter regularity. But the negative effect of magnetic field exists in the extraction process of ethanol-water-benzene,chloroform-water- acetone system. The partition coefficient of ethanol and acetone decrease with the increments of magnetic induction intensities.Based on experiment data, the equation of liquid-liquid equilibrium including magnetic flux density B is put forward. At the same time, dependability is proved by analyzing the fitted results.The experimental data were analysed and distributive coefficient of solute A were obtained in the different condition. And by the method of regression anylysis, relations of distributive coefficient of solute A and magnetic field intensity B were studied and correlations equation of partition coefficient and magnetic field intensity B were obtained.
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