Abstract: A method is presented to predict the vapor-liquid equilibria (VLE) for binary and ternary HFC/HC mixtures using PR equation of state and van der Waals (vdW) mixing rule. The binary interaction parameters kij is predicted by the difference-correlation model, which is assumed to be the difference between the mixing factors ki of the pure components. The values of ki of 10 HFCs and 3 HCs have been obtained according to VLE correlation for 39 binary mixtures in authors' previous works. In this work, this prediction method is further verified with 11 new binary systems (HFC236ea / HC290、HFC152a / HC600、HFC125 / HC600a、HFC143a / HC600、HFC227ea / HC600、HFC152 / HC290、HFC125 / HC227ea、HFC125 / HC290、HFC134a / HC290、HFC134 / HC290、HFC134 / HC600a), and then extended to predict VLE properties of ternary HFC/HC mixtures, which are HFC32 / HFC125 / HFC134a, HC290 / HC600a / HFC32, HFC125 / HFC143a / HFC134a, HFC32 / HC290 / HFC227ea and HFC32/HFC125/HC290. The predicted results are compared with the experimental data reported in literatures. The overall deviations of pressure and vapor composition are 2.23% and 0.0086 for the HFC32 / HFC125 / HFC134a system, 8.33% and 0.014 for the HC290 / HC600a / HFC32 system, 1.43% and 0.0054 for the HFC125 / HFC143a / HFC134a system, 0.40% and 0.0071 for the HFC32 / HC290 / HFC227ea system, and 1.71% and 0.0089 for the HFC32 / HFC125 / HC290 system, respectively. The comparison shows very good agreement between predicted and experimental results, validating the feasibility of the method to predict VLE properties for binary and ternary HFC/HC mixtures.

摘要： 以PR方程结合vdW混合法则，利用建立的二元相互作用系数kij差值关联模型，对11组二元HFC/HC混合工质及5组三元HFC/HC混合工质（HFC32 / HFC125 / HFC134a，HC290 / HC600a / HFC32，HFC125 / HFC143a / HFC134a，HFC32 / HC290 / HFC227ea，HFC32 / HFC125 / HC290）气液相平衡性质进行了推算，并与文献实验数据比较，对压力计算的平均相对偏差分别为2.225%、8.317%、1.433%、0.403%、1.71%，对气相组分计算的平均绝对偏差分别为0.0086、0.0132、0.0054、0.0071、0.0089。结果表明该方法可用于推算二元及三元HFC/HC混合工质气液相平衡性质。

关键词: 汽液相平衡, 二元混合工质, 三元混合工质, HFC/HC, 推算