A DIFFUSION MODEL OF BINARY ALCOHOL/WATER MIXTURES THROUGH PERVAPORATION DENSE MEMBRANE

Chen Fengrong; Chen Hongfang(Department of Chemical Engineering

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A DIFFUSION MODEL OF BINARY ALCOHOL/WATER MIXTURES THROUGH PERVAPORATION DENSE MEMBRANE

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- A DIFFUSION MODEL OF BINARY ALCOHOL/WATER MIXTURES THROUGH PERVAPORATION DENSE MEMBRANE
- CIESC Journal Issue 5, (1996)
- 作者机构：
  
  天津大学化工系!天津300072,天津大学化工系,天津,300072
- 作者简介：
- 基金信息：
- DOI：
  CLC： Q02
- Online First：25 October 1996，
  
  Published：25 October 1996
- 稿件说明：
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Chen Fengrong, Chen Hongfang(Department of Chemical Engineering. A DIFFUSION MODEL OF BINARY ALCOHOL/WATER MIXTURES THROUGH PERVAPORATION DENSE MEMBRANE[J]. CIESC Journal, 1996, (5).
DOI：

Chen Fengrong, Chen Hongfang(Department of Chemical Engineering. A DIFFUSION MODEL OF BINARY ALCOHOL/WATER MIXTURES THROUGH PERVAPORATION DENSE MEMBRANE[J]. CIESC Journal, 1996, (5). DOI：

摘要

用交联聚乙烯酸膜对不同浓度的乙二醇/水溶液在不同温度下分别进行了渗透蒸发实验研究．针对小分子在致密膜中的扩散行为提出了一个新见解，并借用改进的Vigne方程得到了一个新的热力学扩散系数方程，用此方程结合Lee-Thods方程、Wilke-Chang方程、Vrentas和Duda改进的自由体积理论、扩散方程和溶胀平衡方程预测了水和乙二醇分子在不同温度下通过交联聚乙烯醇膜的渗透蒸发行为，其预测结果与实验值基本一致．

Abstract

The pervaporation separation of water-ethylene glycol mixtures was carried out over the full range of compositions at temperatures varying from 60℃ to 80℃

using chemically crosslinked PVA membrane developed in our laboratory.A new version of the diffusion of small molecules in polymeric solids was proposed and the thermodynamic diffusion coefficient equations were derived on the basis of the modified Vigne equations.That version was combined with Lee-Thodos equations

Wilke-Chang equations

Vrentas-Dudas free volume theory，diffusion equations and swelling equilibrium equations

to calculate permeation fluxes of individual components in water-ethylene glycol mixture through crosslinked PVA membrane

which were in good agreement with the experimental values．

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