中文摘要：

提出了一种计算含盐混合溶剂气液相平衡的新模型,即把活度系数表示为盐的质量摩尔浓度ms和溶剂组成摩尔分数xi的函数,其中盐质量摩尔浓度项表示为盐质量摩尔浓度的二次函数,溶剂组成项由UNIQUAC模型计算。以文献中水-醇-盐和醇-醇-盐的11个体系为例,将新模型用于其气液平衡的计算,关联得到了各体系的模型参数。结果表明：将活度系数表示为ms和xi的函数是合适的;每种溶剂组分气相分压的计算值与实验值吻合良好,最大误差为0.928 kPa。因此,新模型是一种可广泛用于含盐有机溶液体系气液相平衡计算的方法。

英文摘要：

A new model was put forward to study vapor-liquid equilibrium in mixed-solvent electrolyte system. The activity coefficient was represented as a function of salt molality msand solvent molar composition xi,the salt concentration term was expressed as a quadratic function of salt molality and the solvent composition was calculated by UNIQUAC model. 11 water-alcohol-salt and alcohol-alcohol-salt systems were selected to calculate the vaporliquid equilibrium by using the new model,and the model parameters were also correlated. The results show that it is proper to express activity coefficient as a function of msand xi. Moreover,the correlation of the new model can accurately represent the vapor partial pressure of each solvent,and the maximum absolute deviation is 0. 928 kPa.Therefore,the new model can be widely applied to calculate the vapor-liquid equilibrium in mixed-solvent electrolyte system.