| 膜厚度和流动状况对渗透蒸发过程的浓差极化影响 |
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| 引用本文： | 刘庆林,李磊.膜厚度和流动状况对渗透蒸发过程的浓差极化影响[J].化学工程,2005,33(6):44-47. |
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| 作者姓名： | 刘庆林 李磊 |
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| 作者单位： | 1. 厦门大学,化学工程与生物工程系,福建,厦门,361005
2. 南京大学,化工系,江苏,南京,210093 |
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| 基金项目： | 国家自然科学基金（50243014）;教育部留学回国人员科研启动基金资助项目 |
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| 摘 要： | 浓差极化对渗透蒸发过程的渗透速率和分离因子有一定负面影响。文中利用渗透蒸发过程中的分步阻力传质模型分析浓差极化,以含乙醇质量分数2%的乙醇/水为进料体系,观察进料流速对渗透蒸发过程中分离因子和通量的影响。分别估算了边界层阻力和膜阻力以及流速对边界层阻力的影响,并考察了膜厚度对浓差极化和分离因子的影响。
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| 关 键 词： | 浓差极化 边界层 分步阻力模型 |
| 文章编号： | 1005-9954（2005）06-0044-04 |
Effect of membrane thickness and flow rate on concentration polarization in pervaporation |
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| LIU Qing-lin,LI Lei.Effect of membrane thickness and flow rate on concentration polarization in pervaporation[J].Chemical Engineering,2005,33(6):44-47. |
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| Authors: | LIU Qing-lin LI Lei |
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| Affiliation: | 1. Department of Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, China; 2. Department of Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu Province, China |
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| Abstract: | The resistance-in-series model was used to describe the transfer resistance in the boundary layer and the membrane in the pervaporation process. The effects of membrane thickness and flow rate on concentration polarization in the pervaporation of ethanol/H2O mixture with 2% ethanol in mass fraction were studied. The item c^8i/c^bi were analyzed in terms of the model to determine the effect of liquid mass-transfer coefficient in the boundary layer and the membrane permeability. Separation factor related directly to polarization index since the membrane intrinsic separation factor was the function of only the membrane characteristics and the operating temperature, and it was increased with flow rate increasing. Experiments were conducted at three different temperatures to elucidate the extent of polarization concentration. The experimental data provided a reasonable fit to the model. |
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| Keywords: | concentration polarization boundary layer resistance-in-series model |
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