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较全面地介绍了近几年来发展的各种典型的超额自由能型汽液相平衡混合规则。该类混合规则吸取了状态方程法和活度系数法在相平衡预测方面的优点,并将对于极性体系预测能力非常强的活度系数模型直接应用于状态方程法的相平衡预测中,实现了向高温区的良好外推和对超临界和亚临界组分的连续准确描述。依次发展的HV型、WS型和TC型三个大类的超额自由能型混合规则中,TC型混合规则的预测精确度要略高于HV型、WS型混合规则的预测精确度,而HV型、WS型混合规则的预测精确度大致相当。从发展的角度看,这些超额自由能型混合规则还要接受三元以上体系的汽液相平衡和液液相平衡预测的考验。另外,如何将超额自由能型混合规则扩展到多参数方程来提高相平衡预测精度,也是超额自由能型混合规则的一个值得关注的发展方向。
It introduces all kinds of typical excess free energy vapor-liquid equilibrium mixing rules developed in recent years. This kind of mixing rule draws the advantages of the equation of state equation and the activity coefficient method in the phase equilibrium prediction and applies the activity coefficient model with very strong prediction ability of the polar system to the phase equilibrium prediction of the state equation method, Good extrapolation to high temperature zones and continuous accurate description of supercritical and subcritical components. Among the three categories of HV, WS and TC, respectively, the prediction accuracy of the TC-type mixing rule is slightly higher than that of the HV and WS-type hybrid rules. The HV , The prediction accuracy of the WS-type mixing rule is roughly the same. From the perspective of development, these excess free energy type mixing rules have to accept the test of vapor-liquid phase equilibrium and liquid-liquid phase equilibrium prediction of the above ternary system. In addition, how to extend the excess free energy type mixing rule to the multi-parameter equation to improve the prediction accuracy of phase equilibrium is also a worthy development direction of the excess free energy type mixing rule.