A key concern for application of fixed carrier membranes in CO 2 capture is the effects of a trace amount of SO 2 present in the flue gas. To eliminate this concern, the effects of SO 2 in the feed gas on CO 2 /N 2 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 SO 2 concentration in the feed gas due to the competitive sorption and competitive reaction caused by SO 2 . The decrease in separation performance is tolerable at even 5000 ppm of SO 2 present in the feed gas. The facilitated transport model was modified by considering the competitive reaction to investigate the transport and interactions of CO 2 and SO 2 . The modeling results suggest that the SO 2 partial pressure at the membrane surface is much lower than that in the bulk feed gas due to the serious concentration polarization of SO 2 under the mixed gas condition, and the decrease in CO 2 permeance is mainly attributed to the competitive reaction.
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Li et al. (2014) studied this question.
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