Experiment and Correlation of Vapor-Liquid Equilibrium of Aqueous Solutions of Hydrophilic Ionic Liquids: 1-Ethyl-3-methylimidazolium Acetate and 1-Hexyl-3-methylimidazolium Chloride
Experiment and Correlation of Vapor-Liquid Equilibrium of Aqueous Solutions of Hydrophilic Ionic Liquids: 1-Ethyl-3-methylimidazolium Acetate and 1-Hexyl-3-methylimidazolium Chloride
复制标题
亲水性离子液体乙酸1-乙基-3-甲基咪唑鎓与氯化1-己基-3-甲基咪唑鎓水溶液的气液平衡实验及关联
DOI：
10.1021/je3001987
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发表时间：
2012-08-01
影响因子：
--
通讯作者：
Hungpu, Lixia
中科院分区：
文献类型：
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作者：
Guo, Kaihua;Bi, Yin;Hungpu, Lixia
对两种基于咪唑的亲水性离子液体（ILs）——乙酸1 - 乙基 - 3 - 甲基咪唑鎓（[Emim]Ac）和氯化1 - 己基 - 3 - 甲基咪唑鎓（[Hmim]Cl）的水溶液的气液平衡（VLE）进行了实验研究。考虑到离子液体分子在水溶液中的聚集效应，提出了一个用于关联亲水性离子液体水溶液气液平衡数据的活度系数模型。结果表明，该模型能在较宽的温度范围和全摩尔浓度范围内有效地呈现强亲水性离子液体溶液的气液平衡特性。分别在（283.15至403.15）K和（283.15至423.15）K以及（20至80）IL摩尔%的范围内测量了这两个二元体系的蒸汽压。实验是使用静态定容装置进行的，其温度不确定度<±10 mK，在低压范围（0至40）kPa内压力不确定度<±0.04 kPa，在高压范围（40至300）kPa内压力不确定度<±0.3 kPa。实验数据与所提出的活度系数方程有很好的相关性，并且显示出良好的准确性和一致性。
The vapor liquid equilibrium (VLE) of the aqueous solutions of two imidazolium-based hydrophilic ionic liquids (ILs), 1-ethyl-3-methylimidazolium acetate ([Emim]Ac) and 1-hexyl-3-methylimidazolium chloride ([Hmim]Cl), were experimentally studied. An activity coefficient model extended for correlation of the VLE data of the aqueous solutions of the hydrophilic ILs was proposed by taking into account the aggregation effects of IL molecules in aqueous solutions. It was shown that the model can effectively present the VLE characteristics of the strong hydrophilic IL solutions in a wide range of temperatures and full range of mole concentration. The vapor pressures of the two binary systems were measured at (283.15 to 403.15) K and (283.15 to 423.15) K, respectively, and in a range of (20 to 80) IL mol %. The tests were performed by using a static constant-volume apparatus with the temperature uncertainty < +/- 10 mK and the pressure uncertainty < +/- 0.04 kPa for the low-pressure range (0 to 40) kPa and < +/- 0.3 kPa for the high-pressure range (40 to 300) kPa. The experimental data were correlated well with the proposed activity coefficient equation and show a good accuracy and consistency.