Thermophysical Properties of Five Acetate-Based Ionic Liquids
Thermophysical Properties of Five Acetate-Based Ionic Liquids
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DOI：
10.1021/je300487n
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发表时间：
2012-11-01
期刊：
影响因子：
--
通讯作者：
Coutinho, Joao A. P.
中科院分区：
文献类型：
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作者：
Almeida, Hugo F. D.;Passos, Helena;Coutinho, Joao A. P.
离子液体（ILs）具有改进的氢键受体能力，如醋酸酯基化合物，在CO2捕获和生物质溶解方面显示出巨大的潜力。在这种情况下，了解醋酸盐基流体的热物理性质对于相关工艺的设计和扩大规模至关重要。然而，在这个阶段，基于醋酸酯的il的表征仍然很差。在这项工作中，测定了五种醋酸酯基ILs的四种热物理性质，特别是密度、粘度、折射率和表面张力。研究了N，N-二甲基-N-乙基乙酸铵、1-乙基咪唑乙酸、1-乙基-3-甲基咪唑乙酸、1-丁基-3-甲基咪唑乙酸和1-丁基-1-甲基吡啶乙酸。根据测量性质的温度依赖性，进一步估计了其他性质，如等压热膨胀系数、表面熵和焓以及临界温度。
Ionic liquids (ILs) with improved hydrogen-bonding acceptor abilities such as acetate-based compounds, have shown great potential for CO2 capture and biomass dissolution. In this context, the knowledge of the thermophysical properties of acetate-based fluids is essential for the design and scale-up of related processes. However, at this stage, acetate-based ILs are still poorly characterized. In this work, four thermophysical properties, specifically, density, viscosity, refractive index, and surface tension, were determined for five acetate-based ILs. Both protic and aprotic ILs were investigated, namely, N,N-dimethyl-N-ethylammonium acetate, 1-ethylimidazolium acetate, 1-ethyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium acetate, and 1-butyl-1-methylpyrrolidinium acetate. From the temperature dependence of the measured properties, additional properties, such as the isobaric thermal expansion coefficient, the surface entropy and enthalpy, and the critical temperature, were further estimated.