合金组元过量焓与真空蒸馏气-液相平衡研究

Correlation between Infinite-Dilution Partial Molar Excess Enthalpy and Vapor-Liquid Equilibrium of Sn-Based Binary Systems in Vacuum Distillation

基于Wilson方程,通过组元的摩尔体积和无限稀偏摩尔过量焓获得Wilson方程的相互作用参数,预测了Sn-X(X=Bi,Cd,Ga,Ge,In,Pb和Sb)体系在5Pa时的VLE(气-液平衡)相图。结果表明,预测值与实验数据具有很好的一致性,在缺乏组元活度的情况下,该方法可以有效预测合金真空蒸馏的气-液平衡,为粗金属的真空分离与提纯提供理论指导。

By means of molar volumes and infinite-dilution partial molar excess enthalpy of components,interaction parameters of the Wilson equation have been obtained.VLE(vapor-liquid equilibrium)phase diagrams of Sn-X(X=Bi,Cd,Ga,Ge,In,Pb and Sb)systems at 5 Pa are modeled successfully based on the Wilson equation.The results indicate that the predicted values agree well with the experimental data.It shows that the method could provide effective prediction for the vacuum distillation process of alloys and theoretical guides for separating and purifying crude metals in cases if the activities of components are scarce.