Influence of C2鈥揌 of Imidazolium-Based Ionic Liquids on the Interaction and Vapor鈥揕iquid Equilibrium of Ethyl Acetate + Ethanol System: [Bmim]BF4 vs [Bmmim]BF4

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• 作者：Yingjie Xu ; Tingting Li ; Changjun Peng ; Honglai Liu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：54
• 期：36
• 页码：9038-9045
• 全文大小：365K
• ISSN：1520-5045

文摘

The effect of C2鈥揌 of alkylimidazolium tetrafluoroborate ionic liquids on the interaction and vapor鈥搇iquid equilibrium (VLE) of the ethyl acetate + ethanol mixture was studied using spectroscopy and the COSMO-RS method. Concentration-dependent ¹H NMR chemical shifts of ethyl acetate + ethanol + [Bmim]BF₄ or [Bmmim]BF₄ (x_IL = 0.1 and 0.3) systems show that the interaction between [Bmim]BF₄ and ethanol is much stronger than that between [Bmmim]BF₄ and ethanol. Moreover, the experimental and predicted VLE demonstrate that the improvement of relative volatility of ethyl acetate to ethanol by [Bmim]BF₄ is better than that by [Bmmim]BF₄. Also, 蟽-profile obtained from COSMO-RS method indicates that the hydrogen bonding donator ability of [Bmim]⁺ is greater than that of [Bmmim]⁺. Therefore, it can be deduced that the acidic C2鈥揌 plays an important role in the interaction differentiation of the ionic liquids and their effect on the VLE of the ethyl acetate + ethanol system, resulting from the interaction of the acidic C2鈥揌 with the ethanol that is much stronger than with the ethyl acetate.