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首页> 外文期刊>Chemical Engineering Science >Countercurrent transport of organic and water molecules through thin film composite membranes in aqueous-aqueous extractive membrane processes. Part II: theoretical analysis
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Countercurrent transport of organic and water molecules through thin film composite membranes in aqueous-aqueous extractive membrane processes. Part II: theoretical analysis

机译：在水-水萃取膜工艺中，有机分子和水分子通过薄膜复合膜逆流传输。第二部分：理论分析

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The aqueous-aqueous extraction of organic compounds through thin film composite (TFC) membranes is investigated using a mathematical model describing the mass transfer across the membrane and hydrodynamic boundary layers at both membranes sides. The model accounts for organic diffusion and convection due to water flux, and enables the characterisation of water and organic counter transport encountered in saline-TFC membrane-aqueous extractive processes. The reliability of the model is tested using experimental data on rate of extraction of toluene from aqueous solutions of NaCl into water. The model is then used to predict the effect of ionic strength, thermodynamic properties (e.g. organic salting-out coefficient) and membrane morphology on the rate of organic extraction. The analysis shows that the retarding effect of countercurrent water transport on organic extraction can be severe for organic compounds with low salting-out coefficients (e.g. phenolic compounds) or for salts with strong influence on water activity (e.g. AlCl3). The model predictions provide the guidelines for choosing the membrane geometry and morphology which minimise this effect and maximise the rate of extraction of a given organic from a given saline solution. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 38]
机译：通过数学模型研究了通过薄膜复合材料（TFC）膜对有机化合物进行水-水萃取，该数学模型描述了跨膜的传质以及膜两侧的流体动力学边界层。该模型考虑了由于水通量引起的有机扩散和对流，并能够表征盐水和TFC膜-水萃取过程中遇到的水和有机逆向转运。使用关于从氯化钠水溶液向水中提取甲苯的速率的实验数据测试模型的可靠性。然后将该模型用于预测离子强度，热力学性质（例如有机盐析系数）和膜形态对有机萃取率的影响。分析表明，对于低盐析系数的有机化合物（例如酚类化合物）或对水活度影响很大的盐（例如AlCl3），逆流水运移对有机萃取的阻滞作用可能很严重。模型预测为选择膜的几何形状和形态提供了指导，这些指导使这种影响最小化，并使从给定盐溶液中提取给定有机物的速率最大化。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：38]

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