Influence Of Magnetic Field On The Vapor-Liquid Equilibrium Of Binary Azeotrope

Ethanol, N-butanol and butyl acetate, as menstrua, are used widely in process of preparation of Chinese traditional medicine. The used organic menstrua become azeotrope with water. It will pollute environment and increase the cost, if menstrua are not reclaimed. In order to cycling menstrua, water must be removed. The method of rectification is adopted to separate the azeotrope in industry. Data of vapor-liquid equlilbrium is the base of rectification. Influence of magnetic field on the vapor-liquid equilibrium is investigated in this paper. It is the precondition of study of influence of magnetic field on the rectification process.The vapor-liquid equilibrium of ethanol-water system, N-butanol-water system and butyl acetate-water system under different magnetic induction intensity is investigated in this paper. The result of investigation indicates that the magnetic field can offer positive influence to the vapor-liquid equilibrium, that is to say, magnetic field will benefit the separation of different system. However, the influence of magnetic field on given system is not simple linearity relation and influence of magnetic field on different system is not consistent. On one hand, different magnetic induction intensity induces different influence of vapor-liquid equilibrium. The influence changes along with magnetic induction intensity and concentration of solution. On the other hand, different systems induce different influence. The influence of vapor-liquid equilibrium of ethanol-water system, N-butanol-water system and butyl acetate-water system descends gradually. That is relative with the property of different systems.In this paper, the data of vapor-liquid equilibrium of ethanol-water system, N-butanol-water system and butyl acetate-water system under different magnetic induction intensity are associated by Wilson or NRTL equation and expressions of activity coefficient under different magnetic induction intensity are obtained. Thermodynamic consistency test proves the reliability of the experimental data. On the base of existing magnetization mechanism and result of experiment, the paper discusses the mechanism of influence of magnetic field on vapor-liquid equilibrium, considers that magnetic field influences vapor-liquid equilibrium through influencing the hydrogen bond in the system and explains the experimental phenomena.