Previous studies showed that electric fields could change the boiling point and vapor pressure of the vapor–liquid equilibrium (VLE) state of pure substances and mixtures. This is an important feature in controlling the separation of mixtures. In this paper, based on the principle of phase equilibrium, together with the formulas of chemical potential including the effect of electric field and the dielectric pressure, the Raoult’s law was extended to include the effect of electric field to describe VLE of a mixture under an external electric field. The effects of electric field on VLE can be calculated by combining the extended Raoult’s law and the Dalton’s law of partial pressure, and then, the effect of electric field on the relative volatility can also be calculated. Numerical calculations showed that the effects of an electric field on VLE depend on both the magnitude and the direction of the electric field, and the effects become obvious until the field strength is greater than 10\(^{7}\) V/m. When the direction of the electric field is parallel to the gas–liquid interface, the vapor pressure decreases; the equilibrium temperature, the mole fractions of the volatile component, and the relative volatility increase. While, when the direction of the electric field is perpendicular to the gas–liquid interface, the opposite changes in these properties appear. The shifting of the equilibrium curves caused by the electric field indicates that the electric field can cause the vapor–liquid phase transition and change the amount of the phase material.

先前的研究表明，电场可以改变纯物质和混合物的沸点和汽液平衡（VLE）状态的蒸气压。这是控制混合物分离的一个重要特征。本文基于相平衡原理，结合包含电场影响和介电压力影响的化学势公式，将拉乌尔定律推广到包含电场影响的情况，以描述混合物在一定条件下的VLE。外部电场。结合扩展拉乌尔定律和道尔顿分压定律可以计算电场对VLE的影响，进而计算电场对相对波动率的影响。\(^{7}\) V/m。当电场方向平行于气液界面时，蒸气压降低；平衡温度、挥发性组分的摩尔分数和相对挥发度增加。而当电场方向垂直于气液界面时，这些特性会出现相反的变化。电场引起的平衡曲线的移动表明电场可以引起汽液相变并改变相物质的量。