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| Study on Azeotropic and Vapor-Liquid Equilibrium of Pb-Sb Alloy |
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Received:August 10, 2020
Revised:August 23, 2020
Accepted:August 24, 2020
Published Online:December 03, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.12.002 |
| KeyWord:Pb-Sb alloys; azeotrope; vapor-liquid equilibrium |
| Author | Institution |
| XU Jun-jie |
Kunming University of Science and Technology |
| GAO Jing-bao |
Kunming University of Science and Technology |
| KONG Ling-xin |
Kunming University of Science and Technology |
| YOU Yan-jun |
昆明理工大学 |
| YANG Bin |
昆明理工大学 |
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| Abstract: |
| Based on theory of vapor-liquid equilibrium, an experimental equipment was designed to measure vapor-liquid equilibrium data of Pb-Sb alloy. The results show that azeotropic phenomena exists in Pb-Sb alloy, which occur between 10% and 20% of molar content of antimony in Pb-Sb alloys. Activity component coefficients of Pb-Sb alloys are calculated by molecular interaction volume model. Average relative deviation and average standard deviation are ±0.08% and ±0.005, respectively, which proves that molecular interaction volume model is suitable for calculating activity component coefficients of Pb-Sb alloys. Vapor-liquid equilibrium phase diagrams (T-x-y diagrams) of Pb-Sb alloys are calculated and plotted by molecular interaction volume model combined with vapor-liquid equilibrium theory. The results show that there is no azeotropy and there is a big deviation from experimental results. The results show that accuracy of saturated vapor pressure of pure metals, molecular form of metal volatilization, bonding force between atoms of liquid metals, surface tension and viscosity of liquid metals all affect calculation results of vapor-liquid equilibrium of alloys, which are not taken into account in current vapor-liquid equilibrium theory. It is pointed out that in this study the next step in study of vapor-liquid equilibrium of alloys is to measure saturated vapor pressure of pure metals from experimental point of view. Based on this, the present vapor-liquid equilibrium theory is developed by combining interatomic binding force and molecular volatilization state so that to be used to calculate azeotropic alloys system and serve vacuum distillation better. |
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