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首页> 外文期刊>RSC Advances >Efficient esterification of n-butanol with acetic acid catalyzed by the Br?nsted acidic ionic liquids: influence of acidity
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Efficient esterification of n-butanol with acetic acid catalyzed by the Br?nsted acidic ionic liquids: influence of acidity

机译：布朗斯台德酸性离子液体催化 n 丁醇与乙酸的有效酯化：酸度的影响

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摘要

The efficiency in the catalytic performance of halogen free functionalized room-temperature Br?nsted acidic ionic liquids (BAILs), having different acidities (due to the ILs containing zero, a single, and or a double –SO3H functional group), for the esterification of n-butanol with acetic acid under various reaction conditions was investigated. The synthesized BAILs have much weaker corrosiveness than that of H2SO4. The nature of both counter anion and cation as well as the presence of additional functional (–SO3H) groups influenced the behavior of the catalyst. Interestingly, the acidic character of the ILs facilitates the reaction under extremely mild conditions, with a short reaction time, and reduction in the side reactions; moreover, the liquid–liquid biphasic reaction mode leads to good yields. The physicochemical properties of these BAILs were characterized by a variety of different analytical and spectroscopic techniques, such as NMR, FT-IR, mass spectrometry, TGA, and UV-vis spectroscopy for the determination of Hammett acidity. In particular, IL-5 having the highest acidity demonstrated excellent catalytic activity for esterification. An additional advantage of BAILs is the simple procedure for the separation of product and catalyst, where the catalysts can be easily recycled without the loss of catalytic activities, making IL-5 an important alternative catalyst for a commercially viable esterification process.
机译：具有不同酸度的无卤素功能化室温布朗斯台德酸性离子液体（BAIL）的催化性能效率（由于IL包含零，一个或一个或两个双–SO 3 H官能团），研究了在不同反应条件下 n 丁醇与乙酸的酯化反应。合成的BAILs的腐蚀性比H 2 SO 4 弱得多。抗衡阴离子和阳离子的性质以及附加官能团（–SO 3 H）的存在都会影响催化剂的性能。有趣的是，IL的酸性特性可在极其温和的条件下，以较短的反应时间促进反应，并减少副反应。此外，液-液两相反应模式可产生良好的收率。这些BAIL的理化特性通过多种不同的分析和光谱技术进行表征，例如NMR，FT-IR，质谱，TGA和UV-vis光谱法，用于确定哈米特酸度。特别地，具有最高酸度的IL-5表现出优异的酯化催化活性。 BAIL的另一个优点是产品和催化剂分离的简单程序，其中催化剂可以轻松地回收利用而又不损失催化活性，这使IL-5成为工业上可行的酯化方法的重要替代催化剂。

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