ZIF-8 Membranes via Interfacial Microfluidic Processing in Polymeric Hollow Fibers: Efficient Propylene Separation at Elevated Pressures,ACS Applied Materials & Interfaces

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ZIF-8 Membranes via Interfacial Microfluidic Processing in Polymeric Hollow Fibers: Efficient Propylene Separation at Elevated Pressures
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2016-09-16 00:00:00 , DOI: 10.1021/acsami.6b08801
Kiwon Eum ₁ , Chen Ma _{1,

2} , Ali Rownaghi ₁ , Christopher W. Jones ₁ , Sankar Nair ₁

Affiliation

Propylene/propane (C₃H₆/C₃H₈) separations are performed on a large scale by energy-intensive distillation processes. Membranes based on metal–organic framework (MOF) molecular sieves, such as zeolitic imidazolate framework-8 (ZIF-8), offer the potential to perform these separations at considerably lower cost. However, the fabrication of scalable ZIF-8 membranes with high performance at elevated pressures and temperatures is challenging. We report the fabrication of high-quality ZIF-8 hollow fiber membranes in engineered polymeric hollow fibers via the interfacial microfluidic membrane processing (IMMP) technique. Control of fiber microstructure, as well as optimization of IMMP conditions, allow us to achieve a C₃H₆/C₃H₈ separation factor of 180 (at 1 bar and 25 °C), which remains high (60) at 120 °C. Furthermore, high-pressure operation of these membranes was investigated. Detailed permeation measurements indicate excellent suppression of defects at higher pressures up to 9.5 bar, allowing a C₃H₆/C₃H₈ separation factor of 90 at 9.5 bar. The membranes also display a 4-fold increase in flux at 9.5 bar as compared to operation at 1 bar. The long-term stability of the ZIF-8 hollow fiber membranes is demonstrated by continuous operation over a month without loss of C₃H₆ permeance or selectivity.

中文翻译：

在聚合物空心纤维中通过界面微流体处理的ZIF-8膜：在高压下有效的丙烯分离

丙烯/丙烷（C ₃ H ₆ / C ₃ H ₈）分离是通过高能耗的蒸馏过程大规模进行的。基于金属有机骨架（MOF）分子筛的膜，例如沸石咪唑酸酯骨架8（ZIF-8），提供了以较低成本进行这些分离的潜力。然而，在升高的压力和温度下具有高性能的可分级ZIF-8膜的制造具有挑战性。我们报告通过界面微流控膜加工（IMMP）技术在工程聚合物中空纤维中制造高质量的ZIF-8中空纤维膜。纤维微结构的控制以及IMMP条件的优化，使我们能够达到C ₃H ₆ / C ₃ H ₈分离系数为180（在1 bar和25°C时），在120°C时仍很高（60）。此外，研究了这些膜的高压操作。详细的渗透测量表明，在高达9.5 bar的高压下，缺陷的抑制效果极佳，在9.5 bar的条件下，C ₃ H ₆ / C ₃ H _8的分离系数为90。与在1 bar下操作相比，该膜在9.5 bar下的通量也增加了4倍。ZIF-8中空纤维膜的长期稳定性可通过连续运行一个月来证明，而不会损失C ₃ H _6的渗透性或选择性。

更新日期：2016-09-16

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