Abstract: A new method is developed which calculated vapor-liquid equilibrium of mixtures directly from the vapor pressure equation of pure components, by using the two-fluid corresponding-state principle at atmospheric or reduced pressures. This method is as rigorous in theory as that based on the equation of state, and as simple in computation as the activity coefficient method. This method may be used satisfactorily in calculating vapor-liquid equilibrium when coordinated with the vdW and Wong mixing rules, but for only homogeneous systems. As an improvement, a simple energy-local-composition mixing rule is suggested. Tested in computing the vapor-liquid equilibria of 37 typical noupolar-nonpolar, polar-polar, and polar-nonpolar binary systems, the proposed method, combined with the suggested rule, has been shown to be more accurate than the one-parameter Wilson equation, but slightly inferior to the two-parameter Wilson equation. The parameter values correlated seem regular against hydrogen-bond change in mixing course of systems.

摘要： 本文运用双流体对应态方法,在常低压区,直接从纯组分蒸汽压方程计算混合物的汽液平衡.此法兼有状态方程法理论严密和活度系数法计算简便的优点.用vdW和Wong两种已有的混合法则配合此法计算,取得一定效果,但限于同系物体系,为此发展了一种新的能量混合法则,用一个调节参数,配合此法计算了大量非(弱)极性-非(弱)极性、极性-极性、极性-非(弱)极性各类体系的汽液平衡,精度相当于活度系数法,关联的参数值有一定规律.