Density, Viscosity, and Vapor–Liquid Equilibrium of the Ternary System Water–1-Ethyl-3-methylimidazolium Acetate–1-Ethyl-3-Methylimidazolium Trifluoromethanesulfonate

详细信息    查看全文

• 作者：Markus BücherlFabian Hardock ; Elisa Kaiser ; Andreas Netsch ; Karlheinz Schaber
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：February 9, 2017
• 年：2017
• 卷：62
• 期：2
• 页码：720-728
• 全文大小：341K
• ISSN：1520-5134

文摘

Mixtures of ionic liquids and water offer an interesting opportunity to replace corrosive and/or partly miscible working pairs like lithium bromide–water in absorption chillers. Such an alternative must feature both a high depression of the water vapor pressure and a low viscosity to be feasible. However, hitherto published literature data of binary systems of ionic liquids and water fulfill only one of the two criteria. A mixture of two different ionic liquids may exhibit a solution for this dilemma. In this work, a ternary system consisting of water, 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc], high reduction of vapor pressure), and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIm][OTf], low viscosity) was investigated. Experimental data for density, dynamic viscosity, and vapor–liquid equilibrium in the temperature range from 293.15 to 353.15 K at water mass fractions between 5% and 20% and different mass fractions of [EMIm][OTf] are presented. The viscosity of the ternary mixture measured with a falling ball viscometer range between 90.9 and 1.9 mPa·s at a relative mean deviation below 3.6%. The density measured with a glass pycnometer range between 1087 and 1285 kg·m^–3 at a relative mean deviation of 0.33%. The water vapor pressure measured by infrared spectroscopy range between 293 and 15164 Pa. The relative mean deviation is below 15.1%. The water vapor pressure data are correlated using a nonrandom two liquid model. The thermodynamic properties show that the considered ternary system can indeed be used as a suitable working mixture in absorption refrigerators.