Characterization of Six Hygroscopic Ionic Liquids with Regard to Their Suitability for Gas Dehydration: Density, Viscosity, Thermal and Oxidative Stability, Vapor Pressure, Diffusion Coefficient, and Activity Coefficient of Water
Characterization of Six Hygroscopic Ionic Liquids with Regard to Their Suitability for Gas Dehydration: Density, Viscosity, Thermal and Oxidative Stability, Vapor Pressure, Diffusion Coefficient, and Activity Coefficient of Water
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DOI：
10.1021/acs.jced.5b00806
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发表时间：
2016-03-01
期刊：
影响因子：
--
通讯作者：
Jess, Andreas
中科院分区：
文献类型：
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作者：
Krannich, Michel;Heym, Florian;Jess, Andreas
研究了6种吸湿离子液体[DMIM] [DMPO4]、[EMIM] [MeSO3]、[EMIM] [EtSO4]、[EMIM] [Et(EG)(2)SO4]、[BMIM] [BF4]和[胆碱][乙醇酸盐]作为吸收式气体脱水工艺干燥剂的适宜性。因此，测量了ILs中水的密度、粘度、活度系数以及热降解和氧化降解的动力学参数（如果文献中没有相应的值）。[ElVIIM][MeSO3]被证明是最适合用于工业气体脱水的候选者。这种IL具有低活度系数，高热稳定性和氧化稳定性，可接受的低粘度以及非常低的蒸汽压。从而确定了温度对该IL中水活度系数和水扩散系数的影响。
Six hygroscopic ionic liquids (ILs), [DMIM] [DMPO4], [EMIM] [MeSO3], [EMIM] [EtSO4], [EMIM] [Et(EG)(2)SO4], [BMIM] [BF4], and [choline] [glycolate], were investigated with regard to their suitability as a drying agent for technical gas dehydration processes by absorption. Therefore, the density, viscosity, activity coefficient of water in the ILs, and the kinetic parameters of thermal and oxidative degradation were measured (if the respective values were not already reported in the literature). [ElVIIM][MeSO3] proved to be the most suitable candidate for industrial gas dehydration. This IL has a low activity coefficient, a high thermal and oxidation stability, an acceptably low viscosity as well as a very low vapor pressure. Thus, the influence of temperature on the activity coefficient of water and the diffusivity of water in this IL was also determined.