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Transport of small polar molecules across nonporous polymeric membranes: II. Shortcomings of phenomenological models of membrane transport

作     者:Ghoreyshi, A.A.  aa_ghoreyshi@yahoo.com Farhadpour, F.A.  f_farhadpour@hotmail.com Soltanieh, M.  msoltanieh@kanoon.net Abdelghani, M. 

作者机构: Department of Chemical Engineering University of Mazandaran P.O. Box 47415-411 Babolsar Iran  Department of Chemical and Process Engineering University of Surrey Guildford Surrey GU2 7XH UK  Department of Chemical Engineering Sharif University of Technology P.O. Box 1365/8639 Tehran Iran 

出 版 物:《Journal of Membrane Science》 

年 卷 期:2003年第211卷第2期

页      面:215-234页

核心收录:

学科分类:0703[理学-化学类] 

主  题:Dialysis  Diffusion  Irreversible thermodynamics  Nonporous membranes  Pervaporation Dialysis  Molecules  Pervaporation  Polymeric membranes  Silicon  Vapors  Membrane transport  Liquid membranes  alcohol  rubber  silicon  water  dialysis  diffusion  membrane  modeling  polymer  transport  article  concentration response  data analysis  dialysis  diffusion coefficient  membrane transport  model  molecule  parameter  performance  pervaporation  phenomenology  polarization  polymerization  porosity  prediction  priority journal  protein interaction  qualitative analysis  thermodynamics  water absorption 

摘      要:A molecule within the nonporous polymeric membrane moves in response to the local driving force and has no memory of how it entered the membrane or how the local gradients were generated. This means that a properly formulated model of transport within the membrane should be equally applicable to dialysis, pervaporation or vapour permeation. The phenomenological approach of irreversible thermodynamics was used to develop transient models of dialysis and pervaporation. The model developed in this study were validated against transient dialysis and pervaporation data for ethanol-water/silicone rubber system. A critical assessment was obtained by recovering the model parameters from the dialysis data and using the same parameters to predict the transient pervaporation performance. The equilibria for the system under study was separately described in terms of Flory-Huggins model with constant interaction parameters where the interaction parameters were found from a nonlinear fit to the available relative sorption data. It was shown the average phenomenological diffusion coefficients recovered from dialysis data can give a good qualitative prediction of pervaporation performance provided the diffusion coefficients satisfy the Onsagar reciprocal relationships. However, a quantitative prediction requires the explicit inclusion of the concentration dependence of the diffusivities as well as a better description of polymer phase equilibria, which is difficult to handle in the framework of irreversible thermodynamics formalism and best achieved within the mechanistic Stefan-Maxwell formulation and deferred to the forthcoming article. (C) 2002 Elsevier Science B.V. All rights reserved.

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