Investigation of gas permeation behavior in facilitated transport membranes: Relationship between gas permeance and partial pressure

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• 作者：Chenxin Zhang ; Zhi Wang ; ^{wangzhi@tju.edu.cn} ; Yan Cai ; Chunhai Yi ; Dongxiao Yang ; Shuangjie Yuan
• 关键词：Gas separation ; Facilitated transport membrane ; Generalized expression ; Gas permeance ; Partial pressure
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：1 June, 2013
• 年：2013
• 卷：225
• 期：Complete
• 页码：744-751
• 全文大小：1211 K

文摘

In this work, a generalized expression for gas permeation, which takes account of the partial pressure, has been developed for both liquid membranes and fixed carrier membranes. The gas permeation behaviors with varying partial pressure were analyzed based on the generalized expression. Based on the expression for the permeance, the facilitated transport parameters of an immobilized liquid membrane and a fixed carrier membrane, including diffusion coefficient of uncomplexed solute and solute-carrier complex as well as reaction equilibrium constant, were calculated by fitting the experimental data of the permeance varying with the partial feed pressure. The calculated parameters agreed well with those in the literature. To check the present expression and the calculated parameters, the gas permeance of two kinds of immobilized liquid membranes and a fixed carried membrane were predicted under varying partial pressure. The predicted results were in satisfactory agreement with the experimental data. Moreover, the prediction for the effects of membrane thickness, carrier concentration and equilibrium constant on the relationship between gas permeance and partial pressure has been carried out.