Duan Xuekui, Kim Donghun, Narasimharao Katabathini, Al-Thabaiti Shaeel, Tsapatsis Michael
Department of Chemical Engineering and Materials Science, University of Minnesota Twin Cities, 421 Washington Ave SE, Minneapolis, MN 55455, USA.
Department of Chemistry, Faculty of Science King Abdulaziz University (KAU), P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Chem Commun (Camb). 2021 Jan 21;57(5):580-582. doi: 10.1039/d0cc07217f.
Nanosheet-based MFI membranes, known to be highly selective for hydrocarbon isomer separations, exhibit an NH3/N2 mixture separation factor of 2236 with NH3 permeance of 1.1 × 10-6 mol m-2 s-1 Pa-1, and NH3/H2 separation factor of 307 with NH3 permeance of 2.3 × 10-6 mol m-2 s-1 Pa-1 at room temperature. Consistent with a competitive sorption-based separation, lower operating temperatures and higher pressures result in increased separation factor. At 323 K, with an equimolar mixed feed of NH3/N2, the fluxes and separation factors at 3 and 7 bar are 0.13 mol m-2 s-1 and 191, and 0.26 mol m-2 s-1 and 220, respectively. This performance compares favorably with that of other membranes and suggests that MFI membranes can be used in separation and purification processes involving mixtures of NH3/N2/H2 encountered in ammonia synthesis and utilization. The membranes also exhibit high performance for the separation of ethane, n-propane and n-butane from H2.
基于纳米片的MFI膜对烃类异构体分离具有高度选择性，在室温下，其对NH₃/N₂混合物的分离因子为2236，NH₃渗透率为1.1×10⁻⁶ mol m⁻² s⁻¹ Pa⁻¹；对NH₃/H₂的分离因子为307，NH₃渗透率为2.3×10⁻⁶ mol m⁻² s⁻¹ Pa⁻¹。与基于竞争吸附的分离一致，较低的操作温度和较高的压力会导致分离因子增加。在323 K下，对于NH₃/N₂等摩尔混合进料，3 bar和7 bar下的通量和分离因子分别为0.13 mol m⁻² s⁻¹和191，以及0.26 mol m⁻² s⁻¹和220。该性能优于其他膜，表明MFI膜可用于涉及氨合成和利用中遇到的NH₃/N₂/H₂混合物的分离和纯化过程。这些膜对从H₂中分离乙烷、正丙烷和正丁烷也表现出高性能。
