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缔合流体及其混合物的亥氏函数和压缩因子可表示为物理相互作用的贡献和化学缔合作用的贡献两部分之和。前者可采用作者建立的非缔合流体及其混合物的分子热力学模型；作者从分子间相互作用位能函数的粘滞球模型出发，利用统计力学方法确定了混合物中自缔合作用的贡献。模型中分子间的缔合参数完全可由纯物质性质确定，而只在混合物方阱位能参数的计算中引入可调的二元相互作用参数。对于含有一个自缔合组分的二元混合物常压和高压汽液平衡数据的关联结果令人满意。
The Hessian functions and compressibility factors of the associated fluids and their mixtures can be expressed as the sum of the contribution of the physical interaction and the contribution of the chemical association. The former can adopt the molecular thermodynamic model of the non-associative fluid and its mixture established by the authors. Based on the viscous spherical model of the intermolecular potential energy function, the author uses statistical mechanics to determine the contribution of self-association in the mixture. The parameters of association between molecules in the model can be completely determined by the properties of pure materials. However, only the parameters of binary interactions can be introduced into the calculation of the square-well energy parameters of the mixture. The correlation between atmospheric and high-pressure vapor-liquid equilibrium data for a binary mixture containing one self-associating component is satisfactory.