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Transport model for solvent permeation through nanofiltration membranes

机译：溶剂通过纳滤膜渗透的传输模型

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This paper describes a new,semi-empirical model for solvent transport through nanofiltration membranes.The model is based on different existing models: Hagen-Poiseuille,Jonsson and Boesen,Machado et al.and Bhanushali et al.The newly developed model introduces a correction to the Bhanushali model.Solvent flux appears to be dependent on viscosity,molecular size and the difference in surface tension between the membrane and the solvent.The model was tested on the results of a series of permeability experiments of binary mixtures of water,methanol and/or ethanol,carried out with seven (hydrophilic and hydrophobic) membranes: Desal-5-DK,Desal-5-DL,N30F,NF-PES-010,MPF-44,MPF-50 and SolSep-030505.The model fits indicated a high correlation with experimental results.The new model showed similar fitting results as existing models for hydrophilic membranes.The solvents used have a relatively high degree of affinity for hydrophilic surfaces,resulting in small repulsion forces and consequently a reduced influence of the membrane-solvent interactions.Thus,existing models are sufficient for hydrophilic membranes and the correction for membrane-solvent interactions proposed here has only a small influence.However,a significant improvement was found for the description of the solvent permeability through hydrophobic membranes.For hydrophobic membranes,the relative importance of membrane-solvent interactions/repulsions is increasing for polar solvents.Existing models could not describe the steep increase in permeability for mixtures with high alcohol fractions,whereas the new model fits significantly better.
机译：本文介绍了一种新的半经验的溶剂通过纳米过滤膜传输的模型，该模型基于Hagen-Poiseuille，Jonsson和Boesen，Machado等人和Bhanushali等人的现有模型，新开发的模型引入了修正溶剂通量似乎取决于粘度，分子大小以及膜与溶剂之间的表面张力差异。模型是根据一系列水，甲醇和甲醇的二元混合物的渗透性实验的结果进行测试的/或乙醇，用七个（亲水和疏水）膜进行处理：Desal-5-DK，Desal-5-DL，N30F，NF-PES-010，MPF-44，MPF-50和SolSep-030505。该模型适合表明该模型与实验结果具有高度相关性。新模型显示出与现有亲水膜模型相似的拟合结果。所用溶剂对亲水表面的亲和力较高，导致排斥力较小，因此因此，现有的模型对于亲水性膜是足够的，此处提出的膜-溶剂相互作用的校正仅产生很小的影响。然而，在描述通过疏水性的溶剂渗透性方面发现了重大改进对于疏水性膜，膜-溶剂相互作用/排斥对于极性溶剂的相对重要性正在增加。现有模型无法描述高醇分数的混合物的渗透率急剧增加，而新模型更适合。

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