Effect of temperature on the physical properties of 1-butyl-3-methylimidazolium based ionic liquids with thiocyanate and tetrafluoroborate anions,and 1-hexyl-3-methylimidazolium with tetrafluoroborate and hexafluorophosphate anions |
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| Institution: | 1. Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, P.O. Box 33, Muscat 123, Oman;2. Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, P.O. Box 87317-51167, Iran;1. Division of Energy Science/Energy Engineering, Luleå University of Technology, 97187 Luleå, Sweden;2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;3. Laboratory of Thermodynamics, Department of Biochemical and Chemical Engineering, TU Dortmund, Emil-Figge-Str. 70, 44227 Dortmund, Germany;1. Department of Chemical Engineering, Faculty of Engineering, Islamic Azad University, North Tehran Branch, PO 1969633-651, Tehran, Iran;2. Separation Processes Research Group (SPRG), Department of Engineering, University of Kashan, Kashan, Iran;3. Energy Research Institute, University of Kashan,Ghotb-e-Ravandi Ave, Kashan, Iran;4. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology (ICST), PO 16765-654, Tehran, Iran;5. Department of Engineering and Technology, Golestan University, Aliabad Katool, Iran;1. Department of Physical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;2. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;1. Universidad de Antofagasta, Facultad de Ingeniería, Departamento de Ingeniería Química y Procesos de Minerales, Av. Angamos 601, Antofagasta, Chile;2. Center for Technological Information (CIT), Monseñor Subercaseaux 667, La Serena, Chile;3. Fac. of Chemical Engineering, Univ. Pontificia Bolivariana, A.A. 56006, Medellín, Colombia;4. Faculty of Sciences, Dept. of Chemistry, University of La Serena, Casilla 554, La Serena, Chile |
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| Abstract: | The effect of temperature on the physical properties of some ionic liquids was investigated. Density, refractive index, surface tension, dynamic and kinematic viscosities of 1-butyl-3-methylimidazolium based ionic liquids with thiocyanate and tetrafluoroborate, and 1-hexyl-3-methylimidazolium with tetrafluoroborate and hexafluorophosphate anions were measured at various temperatures (density from T = (278.15 to 363.15) K, refractive index from (293.15 to 343.15) K, surface tension from (283.15 to 333.15) K, dynamic viscosity from (283.15 to 368.15) K, and kinematic viscosity from (298.15 to 363.15) K). The volumetric properties for the ionic liquids were also calculated from the experimental values of the density at T = 298.15 K. The Vogel–Fulcher–Tammann (VFT) equation was applied to correlate experimental values of dynamic and kinematic viscosities as a function of temperature. As well, the relation between density and refractive index was correlated satisfactorily with several empirical equations such as Lorentz–Lorenz, Dale–Gladstone, Eykman, Oster, Arago–Biot, Newton and Modified–Eykman. Finally, the relation between surface tension and viscosity was investigated and the parachor method was used to predict density, refractive index and surface tension of the ionic liquids. |
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