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中文摘要：
在分子相互作用体积模型基础上,采用牛顿迭代方法同时结合Pb-Bi二元合金体系的无限稀活度系数实验数据γ∞计算对势能相互作用参数Bij,Bji;然后使用参数Bij,Bji计算Pb-Bi二元合金体系的活度系数γ,并与实验值进行了比较分析;利用活度系数γ进一步计算Pb-Bi二元合金体系的分离系数,且同时计算Pb-Bi的气液相平衡组成。气液相平衡计算结果表明：Pb-Bi体系中的组元不能通过一次真空蒸馏实现完全分离。分子相互作用体积模型用于预测二元合金体系的活度及真空蒸馏分离效果具有很高的可靠性,为真空蒸馏分离Pb-Bi二元合金提供了良好的理论依据。
英文摘要：
Here, we addressed the feasibility of Pb-Bi alloy separation by vacuum distillation based on the molecular interaction volume model（ MIVM）. Since the calculated activity coefficients of the Pb-Bi alloy with different Pb contents at 700 K agree well with the available experimental data,the activity coefficients at a temperature ranging from 800- 1400 K were predicted to provide key information to the thermodynamics calculation of the vacuum distillation. Moreover, the contents of Pb and Bi of the Pb-Bi alloy in vapor-liquid equilibrium were calculated. As proved by the experimental data, the calculated results show that it is only feasible to extract Bi from Pb-Bi alloy by continuous multistage distillation, because the separation rate of Bi is close to 1, and that the MIVM is capable of effectively predicting the activity coefficients and separation rates of binary alloy. A higher distillation temperature was found to increase the separation rate of Bi.
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