| 反渗透过程的浓度极化及其传质系数测定 |
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| 引用本文： | 胡中爱,吴红英. 反渗透过程的浓度极化及其传质系数测定[J]. 化工学报, 2000, 21(5): 695-698 |
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| 作者姓名： | 胡中爱 吴红英 |
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| 作者单位： | 西北师范大学化学化工学院,兰州,730070;西北师范大学化学化工学院,兰州,730070 |
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| 基金项目： | 国家自然科学基金,ZR-95-015, |
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| 摘 要： | The relationship between osmotic pressure difference across the membrane and mass transfer coefficient is developed in this paper. On the basis of this relationship, a method for measuring mass transfer coefficient by using experimental data on reverse osmosis is established. Pitzer's equations are used to calculate osmotic pressure differences in order to assure accuracy of results. Under the conditions of constant operating pressure and bulk flow, mass transfer coefficient is scarcely affected by membrane structure, but decreases slightly with increasing feed concentration. The solute concentration in the polarization layer is calculated by using the measured values of mass transfer coefficient. Polarization layer concentration increases with augmentation in bulk concentration. However, their difference increases with increasing bulk concentration until a maximum difference is reached, and then decreases. Mass transfer coefficient increases with higher velocity of bulk flow. If mass transfer coefficient is so large that the ratio(PwΔπσ/k)becomes very small, polarization could be neglected.
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| 关 键 词： | 反渗透 浓度极化 传质系数 |
CONCENTRATION POLARIZATION AND MEASUREMENT OF MASS TRANSFER COEFFICIENT FOR REVERSE OSMOSIS |
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| Hu Zhong'ai,Wu Hongying. CONCENTRATION POLARIZATION AND MEASUREMENT OF MASS TRANSFER COEFFICIENT FOR REVERSE OSMOSIS[J]. Journal of Chemical Industry and Engineering(China), 2000, 21(5): 695-698 |
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| Authors: | Hu Zhong'ai Wu Hongying |
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| Abstract: | The relationship between osmotic pressure difference across the membrane and mass transfer coefficient is developed in this paper. On the basis of this relationship, a method for measuring mass transfer coefficient by using experimental data on reverse osmosis is established. Pitzer's equations are used to calculate osmotic pressure differences in order to assure accuracy of results. Under the conditions of constant operating pressure and bulk flow, mass transfer coefficient is scarcely affected by membrane structure, but decreases slightly with increasing feed concentration. The solute concentration in the polarization layer is calculated by using the measured values of mass transfer coefficient. Polarization layer concentration increases with augmentation in bulk concentration. However, their difference increases with increasing bulk concentration until a maximum difference is reached, and then decreases. Mass transfer coefficient increases with higher velocity of bulk flow. If mass transfer coefficient is so large that the ratio(PwΔπσ/k)becomes very small, polarization could be neglected. |
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| Keywords: | reverse osmosis concentration polarization mass transfer coefficient |
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