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Study on the Conductivities of Pure and Aqueous Bromide-Based Ionic Liquids at Different Temperatures

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Abstract

Electrical conductivities were measured for the pure ionic liquids [C6mim][Br] (1-hexyl-3-methylimidazolium bromide) and [C8mim][Br] (1-octyl-3-methylimidazolium bromide) at 0.1 MPa from 293.15 to 333.15 K. Conductivity measurements were also made for the binary water + [C6mim][Br] and water + [C8mim][Br] systems and their ternary water + [C6mim][Br] + [C8mim][Br] system at 0.1 MPa and 293.15, 298.15, and 303.15 K. The conductivity data of the pure ionic liquids were correlated by the VFT (Vogel-Tamman-Fulcher) equation, and the fitting parameters and mean absolute deviations were determined. New explanations are presented for the molality-dependent behavior of the conductivity of the binary water + [C6mim][Br] and water + [C8mim][Br] systems. The generalized Young’s rule and the semi-ideal solution theory for conductivity were used to predict the conductivities of the ternary water + [C6mim][Br] + [C8mim][Br] system from the conductivities of its corresponding binary water + [C6mim][Br] and water + [C8mim][Br] subsystems. The predictions are in good agreement with the measured values.

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Abbreviations

a w :

water activity

m :

molality, mol⋅(kg-H2O)−1

x :

mole fraction

v :

stoichiometric coefficient for ionization of an IL

°:

the quantities of i in the binary (M i X i –H2O) solution having the same ionic strength as that of a mixed solution

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Authors and Affiliations

  1. State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior & Property Research Laboratory, China University of Petroleum, Bei**g, 102249, China

    Ji-Guang Li, Yu-Feng Hu, Chuan-Wei **, Hong-Da Chu, **ao-Ming Peng & Ying-Guo Liang

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  1. Ji-Guang Li
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  2. Yu-Feng Hu
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  3. Chuan-Wei **
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Li, JG., Hu, YF., **, CW. et al. Study on the Conductivities of Pure and Aqueous Bromide-Based Ionic Liquids at Different Temperatures. J Solution Chem 39, 1877–1887 (2010). https://doi.org/10.1007/s10953-010-9576-z

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