| 压力驱动膜过程中浓差极化的介电模型 |
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| 引用本文： | 李大蔚,乔继欣,王晓琳,赵孔双.压力驱动膜过程中浓差极化的介电模型[J].化学学报,2009,67(4):300-306. |
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| 作者姓名： | 李大蔚 乔继欣 王晓琳 赵孔双 |
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| 作者单位： | (a清华大学化学工程系 北京 100084) (b北京师范大学化学学院 北京 100875) |
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| 摘 要： | 提出了电导率呈指数型分布的浓差极化层的介电模型. 利用传递方程研究了压力驱动膜过程的介电谱, 并导出层内电导率分布与宏观测量的电容和电导之间定量关系的理论表达式, 得到介电谱高低频特征值与浓差极化模数之间的关系. 计算结果表明, 较之线性分布电导率, 指数型分布电导率能更好地描述浓差极化层的介电谱. 研究表明, 介电谱及其特征值和弛豫强度随浓差极化模数和层厚度显著变化. 对由分离膜、主体溶液和浓差极化层组成的复合体系的介电谱进行了数值模拟, 发现电导较之电容其频率依存关系对浓差极化模数的变化更为敏感, 上述研究为利用介电谱在线监测膜分离过程提供了有价值的理论参考.
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| 关 键 词： | 介电谱 浓差极化 膜过程 压力驱动 |
| 收稿时间： | 2008-3-12 |
| 修稿时间： | 2008-4-14 |
Dielectric Model of Concentration Polarization in Pressure-driven Membrane Process |
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| Li Dawei,Qiao Jixin,Wang Xiaolin,Zhao Kongshuang.Dielectric Model of Concentration Polarization in Pressure-driven Membrane Process[J].Acta Chimica Sinica,2009,67(4):300-306. |
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| Authors: | Li Dawei Qiao Jixin Wang Xiaolin Zhao Kongshuang |
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| Institution: | (a Department of Chemical Engineering, Tsinghua University, Beijing 100084) (b College of Chemistry, Beijing Normal University, Beijing 100875) |
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| Abstract: | A dielectric model was proposed for a concentration polarization layer with an exponentially distributed conductivity,and the dielectric spectrum presented for the pressure-driven membrane.A theoretical equation describing the relation between the conductivity distribution and capacitance and/or conductance was obtained,and also,the relation between the characteristic of the dielectric spectrum under high and/or low frequencies and concentration polarization module could be then expressed.Compared with the ... |
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| Keywords: | dielectric spectrum concentration polarization membrane process pressure-driven |
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