摘要
A rational equation of state of the perturbation type with a repulsion and attraction term has been applied to reproduce critical curves of six different binary systems up to high temperatures and pressures. A square well potential for intermolecular interaction is used. With pairwise combination rules for these potentials three adjustable parameters are needed. The experimental critical point and phase equilibrium data are compared with the values predicted using the equation of state. Good agreement is obtained for the analysis of the critical pressure composition data and molar volumes.
利用一个从微扰理论出发得到的含有斥力项和引力项的状态方程计算６个二元系统的临界曲线，这些曲线一直延伸到很高的压力和温度．分子间力采用方阱模型，在势能计算的混合规则中仅需３个可调节参数．计算结果表明，运用状态方程预测的临界曲线、临界压力－组成关系以及摩尔体积与实验结果有很好的一致性．
