Ultrafast Semi‐Solid Processing of Highly Durable ZIF‐8 Membranes for Propylene/Propane Separation
Qiang Ma, Kai Mo, Shushu Gao, Yafang Xie, Jinzhao Wang, Hua Jin, Armin Feldhoff, Shutao Xu, Y. S. Lin, Yanshuo Li
Abstract
Abstract ZIF‐8 membranes have emerged as the most promising candidate for propylene/propane (C 3 H 6 /C 3 H 8 ) separation through its precise molecular sieving characteristics. The poor reproducibility and durability, and high cost, thus far hinder the scalable synthesis and industrial application of ZIF‐8 membranes. Herein, we report a semi‐solid process featuring ultrafast and high‐yield synthesis, and outstanding scalability for reproducible fabrication of ZIF‐8 membranes. The membranes show excellent C 3 H 6 /C 3 H 8 separation performance in a wide temperature and pressure range, and remarkable stability over 6 months. The ZIF‐8 membrane features dimethylacetamide entrapped ZIF‐8 crystals retaining the same diffusion characteristics but offering enhanced adsorptive selectivity for C 3 H 6 /C 3 H 8 . The ZIF‐8 membrane was prepared on a commercial flat‐sheet ceramic substrate. A prototypical plate‐and‐frame membrane module with an effective membrane area of about 300 cm 2 was used for efficient C 3 H 6 /C 3 H 8 separation.