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Interfacial sealing and functionalization of polysulfone/SAPO-34 mixed matrix membrane using acetate-based ionic liquid in post-impregnation for CO2 capture
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2017-12-29 , DOI: 10.1016/j.seppur.2017.12.054
N.N.R. Ahmad , C.P. Leo , A.W. Mohammad , A.L. Ahmad

The CO2 selective ionic liquids (ILs) have been extensively studied in recent years, but their applications are limited by the high viscosity and cost. In this work, acetate-based ionic liquid was used to enhance and functionalize the interface between polysulfone (PSf) and SAPO-34 zeolite in the asymmetric mixed matrix membrane (MMM) prepared via phase inversion. The MMMs were post-modified by immersing the membranes into carboxylate IL solution (1-butyl-3-methylimidazolium acetate). The effects of IL concentration on the membrane morphology and separation performance in CO2 separation were studied. Fourier transform infrared spectra and energy-dispersive X-ray spectra showed that the IL was successfully incorporated into MMM. The post-impregnation of the membrane with IL improved the interface contact between the polymer and zeolite. The interfacial sealing using IL further enhanced the CO2/N2 selectivity of IL-modified MMM, about 818% higher than the CO2/N2 selectivity of unmodified MMM. The maximum selectivity of 39.60 was achieved using PSf membrane incorporated with 5 wt% of SAPO zeolite loading and modified with 0.4 M of IL. This membrane also sustained its separation performance even wet gas was fed.



中文翻译:

聚砜/ SAPO-34混合基质膜的界面密封和功能化,基于醋酸盐的离子液体在浸渍后用于CO 2捕集

近年来,已经对CO 2选择性离子液体(ILs)进行了广泛的研究,但其应用受到高粘度和成本的限制。在这项工作中,使用醋酸盐基离子液体增强并功能化了通过相转化制备的不对称混合基质膜(MMM)中聚砜(PSf)与SAPO-34沸石之间的界面。通过将膜浸入羧酸盐IL溶液(乙酸1-丁基-3-甲基咪唑鎓盐)中,对MMM进行后修饰。IL浓度对CO 2中膜形态和分离性能的影响分离进行了研究。傅立叶变换红外光谱和能量色散X射线光谱表明,IL成功地并入了MMM。用IL对膜进行后浸渍改善了聚合物与沸石之间的界面接触。使用IL界面密封进一步提高了CO 2 / N 2 IL-改性MMM的选择性,约818%高于CO 2 / N 2选择性未修饰的MMM的。使用掺有5 wt%SAPO沸石负载量并用0.4 M IL改性的PSf膜,可实现39.60的最大选择性。即使加入湿气,该膜也保持了其分离性能。

更新日期:2017-12-29
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