Being of great value in calculating the effect of the vapor-phase nonideality, second virial coefficients can be accurately described by the corresponding-state principle. Based on the corresponding-state principle, the new generalized second-virial-coefficient correlations of simple, nonpolar and non-associated polar fluids were proposed in this work. Four mathematical criterions for second-virial-coefficient models were summarized on the basis of the temperature-dependent characteristics of molecular interactions and macroscopic properties. Covering a wide temperature range which had never been reached before, the new-form correlations met the four mathematical criterions strictly. Ab initio values, together with the carefully selected high-quality experimental data, were used to define the “perfect” simple fluid and fitted satisfactory with the present simple spherical and nonpolar terms. More experimental data of second virial coefficients for non-associated polar fluids were collected and the refitted polar term yielded more reliable and physically-reasonable results.

在计算气相非理想性的影响方面具有重要价值，第二维里系数可以通过相应状态原理准确描述。基于相应状态原理，在这项工作中提出了新的广义的第二虚拟系数相关的简单，非极性和非缔合极性流体。根据分子相互作用的温度依赖性特征和宏观性质，总结了第二病毒系数模型的四个数学标准。新形式的关联涵盖了以前从未达到的宽温度范围，严格满足了四个数学标准。从头算值以及精心挑选的高质量实验数据，定义了“完美”的简单流体，并与当前的简单球形和非极性项相吻合。收集了更多有关非缔合极性流体的第二维里系数的实验数据，重新拟合的极性项产生了更可靠和物理上合理的结果。