Dip coating and pyrolysis processes are used to create multi‐layer asymmetric carbon molecular sieve (CMS) hollow fiber membranes with excellent gas separation properties. Coating of an economical engineered support with a high‐performance polyimide to create precursor fibers with a dense skin layer reduces material cost by 25‐fold compared to monolithic precursors or ceramic supports. CMS permeation results with CO 2 /CH 4 (50:50) mixed gas feed show attractive CO 2 /CH 4 selectivity of 58.8 and CO 2 permeance of 310 GPU at 35 °C.
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Cao et al. (2019) studied this question.
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