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Preparation and pervaporation performance of vinyl-functionalized silica membranes
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.memsci.2017.10.066
Sadao Araki , Ami Okabe , Akira Ogawa , Daisuke Gondo , Satoshi Imasaka , Yasuhisa Hasegawa , Koichi Sato , Kang Li , Hideki Yamamoto

Abstract Pervaporation using hydrophobic membranes to separate azeotropic and thermally degradable mixtures, and organics from aqueous solutions with low concentrations has attracted attention. On the other hand, distillation, which is the conventional and commercialized separation method, is unsuitable for the separation of these mixtures. In this study, an α-alumina substrate coated with a γ-alumina layer in both hollow fiber and tubular geometries was used for preparation of vinyl-functionalized silica (VFS) membranes by the sol-gel method using vinyltrimethoxysilane as the silica precursor. Silica functionalized with vinyl groups shows excellent affinity for ethyl acetate (EA) based on Hansen solubility parameters [1]. The VFS membrane prepared on a tubular alumina substrate at 453 K showed the EA flux of 0.85 kg m–2 h–1 and separation factor of 77.3 for pervaporation of a 5% (mass fraction) EA aqueous solution at 295 K. An α-alumina hollow fiber was further used instead of the conventional tubular substrate to improve the EA flux. The hollow fiber-supported VFS membrane has a flux of 2.53 kg m–2 h–1, which is three times higher than that prepared on the tubular-substrate, and a separation factor of 81.5 for the pervaporation of a 5% (mass fraction) EA from aqueous solution at 295 K. The fluxes of methyl acetate and methyl ethyl ketone for the hollow fiber-supported VFS membrane are also about three times higher than those obtained for tube-supported VFS membranes.

中文翻译:

乙烯基官能化硅胶膜的制备及渗透蒸发性能

摘要 使用疏水膜渗透蒸发以从低浓度水溶液中分离共沸和可热降解混合物以及有机物引起了人们的关注。另一方面,作为常规和商业化分离方法的蒸馏不适用于这些混合物的分离。在这项研究中,在中空纤维和管状几何形状中涂有 γ-氧化铝层的 α-氧化铝基材用于通过溶胶-凝胶法使用乙烯基三甲氧基硅烷作为二氧化硅前体制备乙烯基官能化二氧化硅 (VFS) 膜。根据 Hansen 溶解度参数 [1],用乙烯基官能化的二氧化硅对乙酸乙酯 (EA) 显示出极好的亲和力。在 453 K 的管状氧化铝基材上制备的 VFS 膜显示 EA 通量为 0。85 kg m-2 h-1 和 77.3 的分离因子,用于在 295 K 下渗透蒸发 5%(质量分数)EA 水溶液。进一步使用 α-氧化铝中空纤维代替传统的管状基材以提高 EA 通量. 中空纤维负载的 VFS 膜的通量为 2.53 kg m-2 h-1,是在管状基材上制备的膜通量的三倍,对于 5%(质量分数)渗透蒸发的分离系数为 81.5 ) EA 在 295 K 的水溶液中。中空纤维支撑的 VFS 膜的乙酸甲酯和甲乙酮的通量也比管支撑的 VFS 膜的通量高约三倍。进一步使用α-氧化铝中空纤维代替传统的管状基材以提高EA通量。中空纤维负载的 VFS 膜的通量为 2.53 kg m-2 h-1,是在管状基材上制备的膜通量的三倍,对于 5%(质量分数)渗透蒸发的分离系数为 81.5 ) EA 在 295 K 的水溶液中。中空纤维支撑的 VFS 膜的乙酸甲酯和甲乙酮的通量也比管支撑的 VFS 膜的通量高约三倍。进一步使用α-氧化铝中空纤维代替传统的管状基材以提高EA通量。中空纤维负载的 VFS 膜的通量为 2.53 kg m-2 h-1,是在管状基材上制备的膜通量的三倍,对于 5%(质量分数)渗透蒸发的分离系数为 81.5 ) EA 在 295 K 的水溶液中。中空纤维支撑的 VFS 膜的乙酸甲酯和甲乙酮的通量也比管支撑的 VFS 膜的通量高约三倍。
更新日期:2018-02-01
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