Application of MIVM for Pb-Sn System in Vacuum Distillation
Application of MIVM for Pb-Sn System in Vacuum Distillation
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DOI：
10.1007/s11663-012-9726-3
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
L. Kong;Bin Yang;Yifu Li;Bao-qiang Xu;Dachun Liu;Guobin Jia
中科院分区：
文献类型：
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作者：
L. Kong;Bin Yang;Yifu Li;Bao-qiang Xu;Dachun Liu;Guobin Jia
基于分子相互作用体积模型(MIVM)计算了PbSn二元合金系各组分的活度系数。该模型的一个显著优点在于它能够仅用两个二元无限活度系数来预测液态合金的热力学性质。在MIVM的基础上，利用铅和锡的活度系数预测了铅锡合金体系在真空蒸馏过程中的汽液相平衡。结果表明，在1173K(900°C)时，锡在气相中的含量为0.008 wt/%，而在液相中，锡的含量为83wt/%；在1223K(950°C)时，气相中的锡含量为0.022 wt/%，而在液体中，锡的含量为92wt/%；在1273℃(1000℃)时，气相中的锡含量为0.052 wt/%，而液态中的锡含量为97.88%。随着蒸馏温度的升高，气相中的TiN含量增加。为了正确解释模型的结果，对真空蒸馏分离铅锡合金中的铅和锡进行了实验研究。研究了蒸馏时间(20~80分钟)和1173℃、1223℃、1273℃(900℃、950℃、1000℃)的蒸馏温度对分离效果的影响。实验结果表明，在蒸馏温度1173℃(900℃)、蒸发时间20分钟、腔压20℃的操作条件下，锡在气相中的含量为0.085 wt/%，而在液体中为83wt/%；在1223K(950℃)、20℃、20℃、20℃时，气相中的锡含量达到0.18wt/%，而在液体中，锡含量为92 wt/%；在1273℃(1000℃)，20℃，20℃，20℃时，气相为0.35wt/%，液态为97.88wt/%。在所有这些实验中，都观察到汽相中的锡含量随着蒸馏时间和温度的增加而增加。实验结果与PbSn二元系的MIVM预测值吻合较好。
The activity coefficients of components of the Pb-Sn binary alloy system were calculated based on the molecular interaction volume model (MIVM). A significant advantage of this model lies in its ability to predict the thermodynamic properties of liquid alloys using only two binary infinite activity coefficients. Based on the MIVM, the vapor-liquid phase equilibrium of the Pb-Sn alloy system in vacuum distillation has been predicted using the activity coefficients of Pb and Sn. The results showed that the content of tin in the vapor phase was 0.008 wt pct, while in the liquid phase, it was 83 wt pct at 1173 K (900 °C); it reached 0.022 wt pct in the vapor phase, while in the liquid phase, it was 92 wt pct at 1223 K (950 °C); and it was 0.052 wt pct in the vapor phase, while in the liquid phase, it was 97.88 wt pct at 1273 K (1000 °C). The content of tin in the vapor phase increased with the distillation temperature increasing. Experimental investigations into the separation of Pb and Sn from the Pb-Sn alloy by vacuum distillation were carried out for the proper interpretation of the results of the model. The influence of the distillation time (20 to 80 minutes) and the distillation temperatures of 1173 K, 1223 K, and 1273 K (900 °C, 950 °C, and 1000 °C) on the separating effect was also studied. The experimental results showed that the content of tin in the vapor phase was 0.085 wt pct, while in liquid phase, it was 83 wt pct under the operational conditions of distillation temperature of 1173 K (900 °C), evaporation time of 20 minutes, and chamber pressure of 20 Pa; it reached 0.18 wt pct in the vapor phase, while in the liquid phase, it was 92 wt pct at 1223 K (950 °C), 20 minutes, and 20 Pa; and it was 0.35 wt pct in the vapor phase, while in the liquid phase, it was 97.88 wt pct at 1273 K (1000 °C), 20 minutes, and 20 Pa. In all these experiments, it was observed that the content of tin in the vapor phase increased as the distillation time and temperatures were increased. The experimental results are in good agreement with the predicted values of the MIVM for the Pb-Sn binary system.