Thermophysical properties of pure and water-saturated tetradecyltrihexylphosphonium-based ionic liquids
Thermophysical properties of pure and water-saturated tetradecyltrihexylphosphonium-based ionic liquids
复制标题
DOI：
10.1016/j.jct.2011.01.016
复制
发表时间：
2011-06-01
影响因子：
2.6
通讯作者：
Coutinho, Joao A. P.
中科院分区：
文献类型：
--
作者：
Neves, Catarina M. S. S.;Carvalho, Pedro J.;Coutinho, Joao A. P.
在这项工作中，测量了298.15 K时水在几种十四烷基三己基离子液体中的溶解度，以及在较宽的温度范围内纯离子液体和饱和水离子液体的密度和粘度。所选择的离子液体由常见的十四烷基三己基正离子与下列阴离子组合而成：溴、氯、双(三氟甲基磺酰基)亚胺、癸酸酯、甲烷磺酸、二氰胺和二(2，4，4-三甲基戊基)膦酸根。根据密度对温度的依赖关系，测定了纯离子液体和饱和水离子液体的等压热膨胀系数。考虑到目前的疏水饱和离子液体的超额摩尔体积可以忽略不计，根据收集的密度数据估算了水的溶解度，并与实验得到的溶解度进行了比较。此外，实验密度与Gardas和库蒂尼奥模型的预测值进行了比较，而粘度数据则用Vogel-Tammann-Fulcher方法进行了关联。(C)2011爱思唯尔有限公司。保留所有权利。
In this work, the solubility of water in several tetradecyltrihexylphosphonium-based ionic liquids at 298.15 K. and densities and viscosities of both pure and water-saturated ionic liquids in a broad temperature range were measured. The selected ionic liquids comprise the common tetradecyltrihexylphosphonium cation combined with the following anions: bromide, chloride, bis(trifluoromethylsulfonyl)imide, decanoate, methanesulfonate, dicyanamide and bis(2,4,4-trimethylpentyl)phosphinate. The isobaric thermal expansion coefficients for pure and water-saturated ionic liquids were determined based on the density dependence with temperature. Taking into account that the excess molar volumes of the current hydrophobic water-saturated ionic liquids are negligible, the solubility of water was additionally estimated from the gathered density data and compared with the experimental solubilities obtained. Moreover, the experimental densities were compared with those predicted by the Gardas and Coutinho model while viscosity data were correlated using the Vogel-Tammann-Fulcher method. (c) 2011 Elsevier Ltd. All rights reserved.