Estimation of Separation of Electrolytes and Organic Compounds by Nanofiltration Membranes Using an Irreversible Thermodynamic Modei

作     者：Pallab Ghosh 

作者机构：Reverse Osmosis Division Central Salt and Marine Chemicals Research Institute Bhavnagar 364002 Gujarat India 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2003年第11卷第5期

页      面：583-588页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 070302[理学-分析化学] 0703[理学-化学] 

主　　题：diffusion donnan equilibrium electrostatic repulsion ion adsorption irreversible thermodynamics nanofiltration polymeric membranes steric hindrance surface charge 

摘      要：Nanofiltration separation has become a popular technique for removing largeorganic molecules and inorganic substances from water. It is achieved by a combination of threemechanisms: electrostatic repulsion, sieving and diffusion. In the present work, a model based onirreversible thermodynamics is extended and used to estimate rejection of inorganic salts andorganic substances. Binary systems are modeled, where the feed contains an ion that is much lesspermeable to the membrane as compared with the other ion. The two model parameters are estimated byfitting the model to the experimental data. Variation of these parameters with the composition ofthe feed is described by an empirical correlation. This work attempts to describe transport throughthe nanofiltration membranes by a simple model.