A Group Contribution Method for the Correlation of Static Dielectric Constant of Ionic Liquids

doi:10.1016/S1004-9541(14)60009-4

Abstract

Abstract: Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro reactors and heat exchangers. A group contribution method based on 27 groups is developed for the correlation of static dielectric constant of ionic liquids in this paper. The ionic liquids considered include imidazolium, pyridinium, pyrrolidinium, alkylammonium, alkylsulfonium, morpholinium and piperidinium cations and various anions. The data collected cover the temperature ranges of 278.15-343.15 K and static dielectric constant ranges of 9.4-85.6. The results of the method show a satisfactory agreement with the literature data with an average absolute relative deviation of 7.41%, which is generally of the same order of the experimental data accuracy. The method proposed in this paper provides a simple but reliable approach for the prediction of static dielectric constant of ionic liquids at different temperatures.

Key words: ionic liquid, static dielectric constant, group contribution method

摘要： Static dielectric constant is a key parameter to estimate the electro-viscous effect which plays important roles in the flow and convective heat transfer of fluids with ions in microfluidic devices such as micro reactors and heat exchangers. A group contribution method based on 27 groups is developed for the correlation of static dielectric constant of ionic liquids in this paper. The ionic liquids considered include imidazolium, pyridinium, pyrrolidinium, alkylammonium, alkylsulfonium, morpholinium and piperidinium cations and various anions. The data collected cover the temperature ranges of 278.15-343.15 K and static dielectric constant ranges of 9.4-85.6. The results of the method show a satisfactory agreement with the literature data with an average absolute relative deviation of 7.41%, which is generally of the same order of the experimental data accuracy. The method proposed in this paper provides a simple but reliable approach for the prediction of static dielectric constant of ionic liquids at different temperatures.

关键词: ionic liquid, static dielectric constant, group contribution method

ZHOU Ying, LIN Zhen, WU Kejun, XU Guohua, HE Chaohong. A Group Contribution Method for the Correlation of Static Dielectric Constant of Ionic Liquids[J]. Chin.J.Chem.Eng., 2014, 22(1): 79-88.

周颖, 林真, 吴可君, 徐国华, 何潮洪. A Group Contribution Method for the Correlation of Static Dielectric Constant of Ionic Liquids[J]. Chinese Journal of Chemical Engineering, 2014, 22(1): 79-88.

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