等温加压汽液平衡数据的热力学一致性分析

Thermodynamic Consistency Analysis of Vapor-Liquid Equilibrium Data at Elevated Pressure

本文应用吉布斯—杜亨方程对五个二元系13条等温线的加压汽液平衡数据进行了热力学一致性分析。MH(81)状态方程被用来计算汽相逸度系数和液体摩尔体积,其余全部用实验数据进行计算分析。本文还提出了E值分析法。对其中的三个二元系9条等温线的实验数据进行热力学一致性分析。该方法不用状态方程,单凭实验数据就可以进行整体和逐点的分析评价。两种方法的分析结果基本上是一致的。

Thermodynamic consistency of vapor-liquid equilibrium data under pressure for 13 isotherms of five binary systems were analysed with Gibbs-Duhem equation. All data used were from literature except vapour fugacity coefficients and liquid molar volumes which were calculated by MH (81) equation of state. The E value analytical method was put forward for thermodynamic consistency analysis of the experimental VLE data. Nine isotherms of three binary systems were analyzed by the E value analytical method, which can be used to analyse thennodynamic consistency in point by point way and in way as a whole range. The calculation results obtained by Gibbs-Duhem equation agreed well with the E value analysis method.