分子相互作用体积模型在锡锑合金真空蒸馏深度脱锑中的应用

Simulation of Removal of Sb from Sn-Sb Alloy in Vacuum with Molecular Interaction Volume Model

基于分子相互作用体积模型,结合Sn、Sb的无限稀活度系数γ∞Sn、γ∞Sb,运用牛顿迭代法计算了Sn-Sb合金中Sn、Sb的活度系数γSn、γSb,并预测了Sn-Sb合金中Sb的分离系数βSb,结果表明：βSb〉〉1,理论上Sn、Sb能够彻底地分离。同时绘制气液相平衡图,理论预测了Sn-Sb合金组元在气液相间的分布情况,并与试验值进行对比,结果表明,当温度为1200-1400℃,平均相对误差S2＊=5.86%,理论预测值与试验值吻合较好,研究结果为Sn-Sb合金真空蒸馏分离过程提供了可靠的理论依据。

The removal of Sb from Sn-Sb alloy by vacuum distillation was simulated on the basis of the molecular interaction volume model（ MIVM）. The activity coefficients,γSnand γSbof Sn-Sb alloy were calculated in terms of the measured γ∞Snand γ∞Sbof Sn-Sb alloy and in Newton-Raphson methodology. The separation coefficiente of SnSb alloy,Viz. βSbwere predicted. The calculated results show that Sn and Sb can be completely separated becauseβSb 1. The evaluated vapor-liquid equilibrium diagram was used to predict the distributions of Sn and Sb in vapor and liquid phases during vacuum distillation. The calculated and measured results were found to be in good agreement with an averaged relative error of 5. 86% in 1200 - 1400℃ range. We suggest that vacuum distillation be capable of removing Sb from Sn-Sb alloy on industrial scale.