Density and Viscosity for Binary Mixtures of the Ionic Liquid 2,2-Diethyl-1,1,3,3-Tetramethylguanidinium Ethyl Sulfate with Water, Methanol, or Ethanol

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• 作者：Lifeng Zhang ; Xiaoxing Lu ; Dengfeng Ye ; Yongsheng Guo ; Wenjun Fang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1023-1031
• 全文大小：432K
• ISSN：1520-5134

文摘

The ionic liquid (IL), 2,2-diethyl-1,1,3,3-tetramethylguanidinium ethyl sulfate ([(C₂)₂²(C₁)₂(C₁)₂³gu][C₂OSO₃]), was synthesized and characterized. The density and viscosity data were determined for the binary mixtures of [(C₂)₂²(C₁)₂(C₁)₂³gu][C₂OSO₃] with water, methanol, or ethanol over the whole concentration range at different temperatures T = 293.15–323.15 K and atmospheric pressure p = 0.1 MPa. The excess molar volume, V_m^E, and viscosity deviation, Δη, for the binary mixtures are calculated and fitted with the Redlich–Kister type polynomial equation. The values of V_m^E for [(C₂)₂²(C₁)₂(C₁)₂³gu][C₂OSO₃] + water system are observed to be negative, and those for [(C₂)₂²(C₁)₂(C₁)₂³gu][C₂OSO₃] + methanol/ethanol system change from negative to positive against the mole fraction (x₁) of the IL, which exhibit the minimum values around x₁ = 0.2 and the maximum values near x₁ = 0.8. The Δη values for all of the three binary systems are negative, and the minimum values occur near x₁ = 0.6. The temperature dependence of viscosity for pure [(C₂)₂²(C₁)₂(C₁)₂³gu][C₂OSO₃] and its binary mixtures can be well correlated with the Vogel–Fucher–Tammann equation. These fundamental physicochemical properties of the binary mixtures make for a better comprehension of the guanidinium-based ILs and the potential applications.