Mass transport study of PVA membranes for the pervaporation separation of water/ethanol mixtures

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• 作者：Jian Chen ; Junqi Huang ; Jiding Li ; Xia Zhan ; Cuixian Chen
• 关键词：Solution-diffusion model ; Group contribution method ; Pervaporation ; Membrane
• 刊名：Desalination
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：256
• 期：1-3
• 页码：148-153
• 全文大小：309 K

文摘

In this paper, the flux and separation factor for water/ethanol mixtures in PVA membrane system are detected and a modified solution-diffusion model is proposed to account for the mass transport of penetrants in the polymer membrane. In the model, the group contribution method (the UNIFAC-ZM model) is introduced to calculate the activity of penetrants in the polymer membrane, and a modified Fujita temperature-dependence diffusion coefficient equation is developed to describe the diffusion behavior of the penetrants. The aim of this work is to establish a predictive solution-diffusion model. As an exemplary application of the model, the permeation fluxes and separation factors of water/ethanol mixtures in PVA membrane system have been predicted and showed to be in good agreement with experimental values.