| 用NRTL方程计算含离子液体体系的汽液平衡 |
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| 引用本文： | 史奇冰,郑逢春,李春喜,卢贵武,王子镐. 用NRTL方程计算含离子液体体系的汽液平衡[J]. 化工学报, 2005, 56(5): 751-756 |
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| 作者姓名： | 史奇冰 郑逢春 李春喜 卢贵武 王子镐 |
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| 作者单位： | 北京化工大学化学工程学院，北京 100029 |
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| 基金项目： | 国家自然科学基金项目 (20076001,20376004)~~ |
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| 摘 要： | 离子液体作为环境友好溶剂在反应和分离过程中具有良好的应用前景，含离子液体体系汽液平衡的计算及模型化研究具有重要的理论和实际意义.采用非电解质溶液NRTL方程表示溶液的非理想性，关联了［bmim］［PF6］H2O及［C8mim］［PF6］H2O二元体系的等温汽液平衡，关联误差在2%之内;预测了这些体系在其他温度下的汽液平衡，预测的总平均误差均在5%之内.通过关联不同温度下有机物在离子液体C8H14S2O4F6N3和C9H16S2O4F6N3中的无限稀释活度因子的实验数据，得到了有关NRTL方程的二元作用参数，在此基础上预测了离子液体对二元共沸体系汽液平衡的影响.结果表明，含离子液体体系的汽液平衡可以采用传统的非电解质溶液模型如NRTL方程来描述，离子液体的“盐效应”可以显著改善组分的相对挥发度甚至消除共沸现象.
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| 关 键 词： | 离子液体 汽液平衡 NRTL方程 |
| 文章编号： | 0438-1157(2005)05-0751-06 |
| 收稿时间： | 2004-02-18 |
| 修稿时间： | 2004-4-23 |
Calculation of vapor-liquid equilibrium for ionic liquid-containing systems with NRTL equation |
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| SHI Qibing,ZHENG Fengchun,Li Chunxi,LU Guiwu,Wang Zihao. Calculation of vapor-liquid equilibrium for ionic liquid-containing systems with NRTL equation[J]. Journal of Chemical Industry and Engineering(China), 2005, 56(5): 751-756 |
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| Authors: | SHI Qibing ZHENG Fengchun Li Chunxi LU Guiwu Wang Zihao |
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| Abstract: | Ionic liquid as a benign solvent is of great potential to be used in chemical reaction and separation processes, and the modeling of vapor-liquid equilibrium(VLE) for the ionic liquid-containing systems is of both theoretical and practical significance.By using the NRTL equation for non-electrolyte solution, the VLE isotherms for ［bmim］［PF6］-H2O and ［C8mim］［PF6］-H2O binary systems were correlated with deviation within 2% and the VLE data at other temperatures were predicted with the mean relative deviation within 5%.The experimental infinite dilution activity coefficients of some organic chemicals in ionic liquids C8H14S2O4F6N3 and C9H16S2O4F6N3 at different temperatures were correlated successfully with the NRTL equation,and the binary parameters thus obtained were used to study the effect of ionic liquid on the VLE of azeotropic binary systems. It was shown that VLE for ionic liquid-containing systems could be well represented with the conventional NRTL equation.The relative volatility of components could be largely affected and azeotropic point could even be eliminated by the “salt effect” of ionic liquid. |
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| Keywords: | ionic liquid vapor-liquid equilibrium NRTL equation |
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