Yu Kunpeng, Ji Taotao, Wu Mingming, Chen Sixing, Gao Yunlei, Yan Jiahui, Meng Shengyan, Hu Wenjing, Fan Xiao, Dong Wenwen, Yin Jianzhong, Liu Yi
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Linggong Road NO. 2, Ganjingzi District, Dalian, 116024, China.
Dalian Key Laboratory of Membrane Materials and Membrane, Processes, Dalian University of Technology, Dalian, 116024, China.
Angew Chem Int Ed Engl. 2025 Mar 17;64(12):e202422709. doi: 10.1002/anie.202422709. Epub 2024 Dec 20.
ZIF-8 membranes have shown great promise in industrial-scale CH/CH separation. Nonetheless, sustainable preparation of pressure-resistant ZIF-8 membranes remains a grand challenge. In this study, we pioneered the use of supercritical ethane (scCH) as reaction medium for preparing pressure-resistant ZIF-8 membranes. Membrane growth in neutral organic environment was proven to have less disturbance to structure integrity compared with supercritical CO (scCO). Gas permeation results indicated that obtained ZIF-8 membrane exhibited an ideal CH/CH selectivity of 172.1 with CH permeance of 5.9×10 mol ⋅ m ⋅ s ⋅ Pa. Of particular note, the membrane maintained stable CH/CH selectivity of ~150 with CH flux of ~1.6×10 mol ⋅ m ⋅ s at operation pressure of 6 bar, which was significantly different from ZIF-8 membranes obtained from scCO reaction medium. Through combining with advantages of zero pollutant discharge and full ligand recovery, our protocol holds great promise in sustainable preparation of pressure-resistant ZIF-8 membranes towards practical application in high-purity CH production.
ZIF-8膜在工业规模的CH/CH分离中已展现出巨大潜力。尽管如此，可持续制备耐压ZIF-8膜仍然是一项重大挑战。在本研究中，我们率先使用超临界乙烷（scCH）作为反应介质来制备耐压ZIF-8膜。与超临界CO（scCO）相比，在中性有机环境中进行膜生长被证明对结构完整性的干扰更小。气体渗透结果表明，所制备的ZIF-8膜表现出理想的CH/CH选择性，为172.1，CH渗透率为5.9×10 mol ⋅ m ⋅ s ⋅ Pa。特别值得注意的是，在6 bar的操作压力下，该膜保持了约150的稳定CH/CH选择性，CH通量约为1.6×10 mol ⋅ m ⋅ s，这与通过scCO反应介质制备的ZIF-8膜有显著差异。通过结合零污染物排放和配体完全回收的优势，我们的方案在可持续制备耐压ZIF-8膜以用于高纯度CH生产的实际应用方面具有巨大潜力。
