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《中国化学工程学报(英文版)》 2008-02
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Densities and Viscosities of the Ionic Liquid[C_4mim][PF_6]+ N,N-dimethylformamide Binary Mixtures at 293.15 K to 318.15 K

GENG Yanfang,WANG Tengfang,YU Dahong,PENG Changjun,LIU Honglai and HU Ying State Key Laboratory of Chemical Engineering and Department of Chemistry,East China University of Science and Technology,Shanghai 200237,China  
Viscosities and densities for 1-butyl-3-methylimidazolium hexafluorophosphate([C4mim][PF6])and 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 cor- relation accuracy is further improved when two parameters or one temperature-dependent parameter is used.
【Fund】: the National Natural Science Foundation of China(20476025 20776040);; Shanghai Municipal Science andTechnology Commission of China(05DJ14002);; Hubei Key Laboratory of Novel Chemical Reactor and Green ChemicalTechnology of China(XLHX2007002)
【CateGory Index】: O621.25
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