Acid-functionalized PVA composite membranes for pervaporation-assisted esterification.

IF 3.4 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Julia Piotrowska, Christian Jordan, Kristof Stagel, Marco Annerl, Jakob Willner, Andreas Limbeck, Michael Harasek, Katharina Bica-Schröder
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引用次数: 0

Abstract

Composite flat-sheet membranes functionalized with imidazolium-based ionic liquids (ILs) grafted to poly(vinyl alcohol)/glutaraldehyde as a catalytic layer were developed to enhance the esterification between n-butanol and acetic acid. The functionalized membranes were produced via dip-coating commercial pervaporation membranes, and two distinct Brønsted-acidic ILs with an imidazolium-based cation and different (hydrogen sulfate [HSO4]- or bromide [Br]-) anions were compared. Compact, 12 μm-thick, defect-free catalytic layers were observed on top of the pervaporation membrane supports, and the determined penetration depth of the ILs confirmed their presence in the upper part of the coating. While both ILs could significantly promote the esterification of n-butanol and acetic acid, the [HSO4]- anion catalyzed the formation of butyl acetate more effectively than [Br]--based species, resulting in yields of up to 50% over 15 h. Furthermore, the coated membranes exhibited enhanced water separation factors compared to the unfunctionalized one owing to the reduced swelling of the coated membranes accompanied with their diminished wettability.

用于过汽化辅助酯化的酸功能化PVA复合膜。
以咪唑基离子液体(ILs)接枝聚乙烯醇/戊二醛为催化层,制备了复合平板膜,以促进正丁醇与乙酸之间的酯化反应。通过浸渍涂覆商业渗透蒸发膜制备了功能化膜,并比较了两种具有咪唑基阳离子和不同阴离子(硫酸氢[HSO4]-或溴化[Br]-)的Br / nsted-酸性膜。在渗透蒸发膜载体的顶部可以观察到致密的、12 μm厚的、无缺陷的催化层,并且通过测定渗透深度证实了它们在涂层上部的存在。虽然这两种il都能显著促进正丁醇和乙酸的酯化反应,但[HSO4]-阴离子比[Br]-物种更有效地催化乙酸丁酯的形成,在15小时内的产率高达50%。此外,与未功能化的膜相比,涂覆膜的水分离因子增强,这是因为涂覆膜的肿胀减少,同时润湿性降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Reaction Chemistry & Engineering
Reaction Chemistry & Engineering Chemistry-Chemistry (miscellaneous)
CiteScore
6.60
自引率
7.70%
发文量
227
期刊介绍: Reaction Chemistry & Engineering is a new journal reporting cutting edge research into all aspects of making molecules for the benefit of fundamental research, applied processes and wider society. From fundamental, molecular-level chemistry to large scale chemical production, Reaction Chemistry & Engineering brings together communities of chemists and chemical engineers working to ensure the crucial role of reaction chemistry in today’s world.
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