Effects of Minor SO2 on the Transport Properties of Fixed Carrier Membranes for CO2 Capture

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• 作者：Shichun Li ; Zhi Wang ; Wenjuan He ; Chenxin Zhang ; Hongyu Wu ; Jixiao Wang ; Shichang Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：May 7, 2014
• 年：2014
• 卷：53
• 期：18
• 页码：7758-7767
• 全文大小：465K
• 年卷期：v.53,no.18(May 7, 2014)
• ISSN：1520-5045

文摘

A key concern for application of fixed carrier membranes in CO₂ capture is the effects of a trace amount of SO₂ present in the flue gas. To eliminate this concern, the effects of SO₂ in the feed gas on CO₂/N₂ permeance and selectivity of fixed carrier membranes were investigated by combining experimental and modeling study. The experimental results reveal that the separation performance of the membrane slightly decreases with increasing SO₂ concentration in the feed gas due to the competitive sorption and competitive reaction caused by SO₂. The decrease in separation performance is tolerable at even 5000 ppm of SO₂ present in the feed gas. The facilitated transport model was modified by considering the competitive reaction to investigate the transport and interactions of CO₂ and SO₂. The modeling results suggest that the SO₂ partial pressure at the membrane surface is much lower than that in the bulk feed gas due to the serious concentration polarization of SO₂ under the mixed gas condition, and the decrease in CO₂ permeance is mainly attributed to the competitive reaction.