Dual-Membrane Module and Its Optimal Flow Pattern for H2/CO2 Separation

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• 作者：Bo Chen ; Xuehua Ruan ; Xiaobin Jiang ; Wu Xiao ; Gaohong He
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：55
• 期：4
• 页码：1064-1075
• 全文大小：706K
• ISSN：1520-5045

文摘

A dual-membrane module is able to provide higher separation performance for H₂/CO₂ gas mixtures compared to conventional single-membrane modules. In this work, the flow patterns of dual-membrane modules are studied, and the results indicate that the co(H₂):counter(CO₂) flow pattern is the optimal flow pattern for H₂ recovery. The co(H₂):counter(CO₂) flow pattern employs cocurrent (permeate flow parallel to bulk flow) to the H₂-selective membrane and counter-current (permeate flow reverse to bulk flow) to the CO₂-selective membrane; the flow pattern reduces the permeation flux of CO₂ in the H₂-selective membrane, resulting in a higher H₂ separation factor. The evaluations show that the H₂ product purity could be raised by 35% (from 62 mol % to 84 mol %) compared to conventional membrane modules. The results indicate that enhancing the membrane separation performance through flow pattern is a practical and effective method for process engineering.