Densities and Viscosities of the Ionic Liquid[C4mim][PF6]+N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K

Abstract

Abstract: Viscosities and densities for 1-butyl-3-methylimidazolium hexafluorophosphate([C₄mim][PF₆])+N,N-dimethylformamide(DMF)binary mixtures have been measured at the temperature range from 293.15 K to 318.15 K.It is shown that the viscosities and densities decrease monotonously with temperature and the content of DMF.Various correlation methods including Arrhenius-like equation,Seddon et al.'s equation,Redlich-Kister equation with four parameters,and other empirical equations were applied to evaluate these experimental data.A model based on an equation of state for estimating the viscosity of mixtures containing ionic liquids were proposed by coupling with the excess Gibbs free energy model of viscosity,which can synchronously calculate the viscosity and the molar volume.The results show that the model gives a deviation of 8.29% for the viscosity,and a deviation of 1.05% for the molar volume when only one temperature-independent adjustable parameter is adopted.The correlation accuracy is further improved when two parameters or one temperature-dependent parameter is used.

Key words: ionic liquid, N,N-dimethylformamide, density, viscosity, [C₄mim][PF₆], correlation

摘要： Viscosities and densities for 1-butyl-3-methylimidazolium hexafluorophosphate([C₄mim][PF₆])+N,N-dimethylformamide(DMF)binary mixtures have been measured at the temperature range from 293.15 K to 318.15 K.It is shown that the viscosities and densities decrease monotonously with temperature and the content of DMF.Various correlation methods including Arrhenius-like equation,Seddon et al.'s equation,Redlich-Kister equation with four parameters,and other empirical equations were applied to evaluate these experimental data.A model based on an equation of state for estimating the viscosity of mixtures containing ionic liquids were proposed by coupling with the excess Gibbs free energy model of viscosity,which can synchronously calculate the viscosity and the molar volume.The results show that the model gives a deviation of 8.29% for the viscosity,and a deviation of 1.05% for the molar volume when only one temperature-independent adjustable parameter is adopted.The correlation accuracy is further improved when two parameters or one temperature-dependent parameter is used.

关键词: ionic liquid, N,N-dimethylformamide, density, viscosity, [C₄mim][PF₆], correlation

GENG Yanfang, WANG Tengfang, YU Dahong, PENG Changjun, LIU Honglai, HU Ying. Densities and Viscosities of the Ionic Liquid[C₄mim][PF₆]+N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K[J]. , 2008, 16(2): 256-262.

耿彦芳, 王腾芳, 虞大红, 彭昌军, 刘洪来, 胡英. Densities and Viscosities of the Ionic Liquid[C₄mim][PF₆]+N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K[J]. , 2008, 16(2): 256-262.

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Densities and Viscosities of the Ionic Liquid[C₄mim][PF₆]+N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K

Densities and Viscosities of the Ionic Liquid[C₄mim][PF₆]+N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K

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