Liquid-Liquid Phase Equilibrium of Ionic Liquids

• Main Authors: Bo-Hsuang Lee, 李伯軒
• Other Authors: Jung-Ching Tasi
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/69653803007215637782

碩士 === 明志科技大學 === 化工與材料工程研究所 === 99 === The purpose of this study was to measure the liquid-liquid equilibrium data of ionic liquids and to provide the data for simulation and design of related systems in the separation processes. In this study we measured the following terms of systems （1）1-butyl-3-methylimidazolium hexafluorophosphate（[Bmim][PF6]） + propyl acetate + propanol （2）1-butyl-3-methylimidazolium hexafluorophosphate + isopropyl acetate + 2-propanol （3）1-butyl-3-methylimidazolium chloride（[Bmim][Cl]） + propyl acetate + propanol （4）1-butyl-3-methylimidazolium chloride + isopropyl acetate + 2-propanol （5）1-hexyl-3-methylimidazolium chloride（[Hmim][Cl]） + propyl acetate + propanol （6）1-hexyl-3-methylimidazolium chloride-isopropyl acetate-2-propanol （7）1-octyl-3-methylimidazolium chloride（[Omim][Cl]） + propyl acetate + propanol （8）1-octyl-3-methylimidazolium chloride + isopropyl acetate + 2-propanol We used cloud point method to measure the solubility curve of the mixtures, then the tie-line can be find by using the density and refraction index of the composition of the mixtures, the data was measured at three different temperatures, 298.15 K, 308.15 K and 318.15 K. From the experiment results we can find that as the temperature increased, the two-phase zone of the three components was reduced. For the solubility of [Bmim][PF6], as the temperature increased, the solubility of the three components was relative low at 298.15 K, its solubility can reach 0.7 (mole fraction), but when the temperature increased to 318.15 K, the solubility decreased to about 0.5 (mole fraction). For the density, it was decrease when the temperature increased, also the refraction index was increase on the ionic liquid using [PF6] as anion and decrease when the ionic liquid using [Cl] as anion.