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Ultramicroporous material based parallel and extended paraffin nano-trap for benchmark olefin purification

Zhang Peixin,Yang Lifeng,Liu Xing,Wang Jun,Suo Xian,Chen Liyuan,Cui Xili,Xing Huabin

Selective paraffin capture from olefin/paraffin mixtures could afford high-purity olefins directly, but suffers from the issues of low separation selectivity and olefin productivity. Herein, we report an ultramicroporous material (PCP-IPA) with parallel-aligned linearly extending isophthalic acid units along the one-dimensional channel, realizing the efficient production of ultra-high purity C 2 H 4 and C 3 H 6 (99.99%). The periodically expanded and parallel-aligned aromatic-based units served as a paraffin nano-trap to contact with the exposed hydrogen atoms of both C 2 H 6 and C 3 H 8 , as demonstrated by the simulation studies. PCP-IPA exhibits record separation selectivity of 2.48 and separation potential of 1.20 mol/L for C 3 H 8 /C 3 H 6 (50/50) mixture, meanwhile the excellent C 2 H 6 /C 2 H 4 mixture separation performance. Ultra-high purity C 3 H 6 (99.99%) and C 2 H 4 (99.99%) can be directly obtained through fixed-bed column from C 3 H 8 /C 3 H 6 and C 2 H 6 /C 2 H 4 mixtures, respectively. The record C 3 H 6 productivity is up to 15.23 L/kg from the equimolar of C 3 H 8 /C 3 H 6 , which is 3.85 times of the previous benchmark material, demonstrating its great potential for those important industrial separations.