| 苯乙烯/二氧化碳/聚苯乙烯三元混合物的相平衡预测 |
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| 引用本文： | 吴家龙,潘勤敏,G.L.Rempel. 苯乙烯/二氧化碳/聚苯乙烯三元混合物的相平衡预测[J]. 中国化学工程学报, 2002, 10(6): 706-710 |
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| 作者姓名： | 吴家龙 潘勤敏 G.L.Rempel |
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| 作者单位： | InstituteofPolymerEngineering,ZhejiangUniversity,Hangzhou310027,China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (No. 29676037). |
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| 摘 要： | A lattice fluid model,Sanchez-Lacombe equation,is used to predict the phase behavior for a styrene/CO2/polystyrene ternary system.The binary parameters involved in the equation were optimized using experimental data.Phase diagrams and the distribution coefficients of styrene between polymer phase and fluid phase are obtained over a wide rang of pressure,temperature and composition.The analysis of ternary phase diagrams indicates that this system at relatively high pressure or low temperature may display two-phase equilibrium,and at low pressures or high temperatures three-phase equilibrium may appear.The distribution coefficients of styrene between the fluid phase and the polymer phase increase asymptotically to unity when the concentration of styrene increases.The results provide thermodynamic knowledge for further exploitation of supercritical carbon dioxide assisted devolatilization and impregnation.
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| 关 键 词： | 苯乙烯 二氧化碳 聚苯乙烯 三元混合物 相平衡 预测 超临界流体 分布系数 |
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Prediction of Phase Behavior for Styrene/CO2/Polystyrene Mixtures |
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| G.L.Rempel. Prediction of Phase Behavior for Styrene/CO2/Polystyrene Mixtures[J]. Chinese Journal of Chemical Engineering, 2002, 10(6): 706-710 |
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| Authors: | G.L.Rempel |
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| Affiliation: | Institute of Polymer Engineering, Zhejiang University, Hangzhou 310027,China Department of Chemical Engineering, University of Waterloo, ON, N2L 3G1,Canada |
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| Abstract: | A lattice fluid model, Sanchez-Lacombe equation, is used to predict the phase behavior for a styrene/CO2/polystyrene ternary sys-tem. The binary parameters involved in the equation were optimized using experimental data. Phase diagrams and the distribution coefficients of styrene between polymer phase and fluid phase are obtained over a wide range of pressure, temperature and composition. The analysis of ter-nary phase diagrams indicates that this system at relatively high pressure or low temperature may display two-phase equilibrium, and at low pressures or high temperatures three-phase equilibrium may appear. The distribution coefficients of styrene between the fluid phase and the polymer phase increase asymptotically to unity when the concentration of styrene increases. The results provide thermodynamic knowledge for further exploitation of supercritical carbon dioxide assisted devolatilization and impregnation. |
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| Keywords: | ternary phase diagram distribution coefficient polystyrene supercritical fluid |
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