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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。
Based on the molecular interaction volume model, the potential energy interaction parameters Bij and Bji are calculated by the Newton iteration method combined with the experimental data of infinite dilute activity coefficient γ∞ of the Pb-Bi binary alloy system. Then the parameters Bij and Bji are used to calculate the Pb -Bi binary alloy system, and compared with the experimental values; the activity coefficient γ was used to further calculate the separation coefficient of the Pb-Bi binary alloy system, and simultaneously calculate the vapor-liquid equilibrium of Pb-Bi composition. The gas-liquid equilibrium calculation results show that the components in the Pb-Bi system can not be completely separated by one vacuum distillation. Molecular interaction volume model is used to predict the activity of binary alloy system and the effect of vacuum distillation separation with high reliability. It provides a good theoretical basis for the vacuum distillation separation of Pb-Bi binary alloys.