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Measurement and Correlation of the Electrical Conductivity of the Ionic Liquid [BMIM][TFSI] in Binary Organic Solvents

  • Yanli Fu
    Yanli Fu
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
    More by Yanli Fu
  • Xianbao Cui*
    Xianbao Cui
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
    *E-mail: [email protected]; [email protected]. Phone/Fax: +86-22-27404493.
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  • Ying Zhang
    Ying Zhang
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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  • Tianyang Feng
    Tianyang Feng
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Jie He
    Jie He
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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  • Xuemei Zhang
    Xuemei Zhang
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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  • Xue Bai
    Xue Bai
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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  • , and 
  • Qinglong Cheng
    Qinglong Cheng
    State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Cite this: J. Chem. Eng. Data 2018, 63, 5, 1180–1189
Publication Date (Web):March 26, 2018
https://doi.org/10.1021/acs.jced.7b00646
Copyright © 2018 American Chemical Society

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    Abstract

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    In this paper, the electrical conductivities of ionic liquid 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM][TFSI]) in mixed organic solvents of propylene carbonate (PC) + γ-butyrolactone (GBL) and ethylene carbonate (EC) + dimethyl carbonate (DMC) were measured. The effects of mixed organic solvents with different ratios (1:0, 2:1, 1:1, 1:2, 0:1) on the electrical conductivity of ionic liquid were investigated. The organic solvents EC and DMC have a synergistic effect for the electrical conductivity of [BMIM][TFSI]–EC/DMC, and the optimal ratio of EC to DMC is 1:1; however, the organic solvents have no synergistic effect in [BMIM][TFSI]–PC/GBL. The concentration dependence of the electrical conductivity of the solution can be well fitted by the empirical Casteel–Amis equation. The effects of temperature on electrical conductivity can be described by the Vogel–Tamman–Fulcher (VTF) equation and the Arrhenius equation. The IL concentration dependence of the activation energy Ea and the pre-exponential factor A in the Arrhenius equation were also investigated, and fitted by empirical equations. On the basis of the VTF equation and the Arrhenius equation, a quasi-Arrhenius equation was proposed to describe the effects of temperature and composition on the electrical conductivity simultaneously in binary systems and ternary systems, and the correlation results agree well with the experimental results.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jced.7b00646.

    • Experimental conductivity data for [BMIM][TFSI]–PC–GBL (PC:GBL = 1:1) and [BMIM][TFSI]–EC–DMC (EC:DMC = 1:1) with IL mole fraction and temperature (Tables S1 and S2); experimental conductivity data for [BMIM][TFSI]–PC–GBL (PC:GBL = 1:0; 2:1; 1:2; 0:1) and [BMIM][TFSI]–EC–DMC (EC:DMC = 1:0; 2:1; 1:2; 0:1) with IL mole fraction x at 318.15 K (Table S3); dielectric constant and viscosity of organic solvent (Table S4); parameters and R2, RMSE of the Casteel–Amis equation fitted to the electrical conductivity of [BMIM][TFSI]–PC–GBL and [BMIM][TFSI]–EC–DMC mixtures (Tables S5–S7); parameters and R2, RMSE of the VTF equation fitted to the electrical conductivity of [BMIM][TFSI]–PC–GBL (PC:GBL = 1:1) and [BMIM][TFSI]–EC–DMC (EC:DMC = 1:1) mixtures (Tables S8 and S9); parameters and R2, RMSE of the Arrhenius equation fitted to the temperature dependency of the electrical conductivity of [BMIM][TFSI]–PC–GBL (PC:GBL = 1:1) and [BMIM][TFSI]–EC–DMC (EC:DMC = 1:1) mixtures (Tables S10 and S11) (PDF)

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