Measurement of Heat Capacity and Electrical Conductivity of Aqueous Solutions of Ionic Liquids

• Main Authors: Pei-Yin Lin, 林姵吟
• Other Authors: Meng-Hui Li
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/39094894120057437254

碩士 === 中原大學 === 化學工程研究所 === 97 === The heat capacities and electrical conductivities of four binary aqueous solutions of ionic liquids had been measured. The investigated ionic liquid systems were as follows: [Bmim][CF3SO3] (1-butyl-3-methylimidazolium trifluoromethanesulfonate) + H2O, [Bmim][MeSO4] (1-butyl-3-methylimidazolium methylsulfate) + H2O, [Emim][CF3SO3] (1-ethyl-3-methylimidazolium trifluoromethanesulfonate) + H2O, and [Emim][C2H5SO4] (1-ethyl-3-methylimidazolium ethylsulfate) + H2O. The heat capacities were measured over the temperature range from (303.2 to 353.2) K using a differential scanning calorimeter (DSC). The electrical conductivities were measured using a commercial conductivity meter in the temperature range from (293.2 to 353.2) K. The estimated uncertainties of heat capacity CP and electrical conductivity  measurements were  0.015 (kJkg-1K-1) and  0.001 (Sm-1). The heat capacities and electrical conductivities were presented as a function of temperature and composition. For the studied aqueous ionic liquid systems, the excess molar heat capacity values were represented by typical Redlich-Kister expansion and the  values were correlated using equations from other investigators and its modified forms. The correlations give satisfactory results. The heat capacities and electrical conductivities presented in this work are, in general, of sufficient accuracy for most engineering-design calculations.