High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids

Ramesh Gardas, M.G. Freire, P.J. Carvalho, I.M. Marrucho, I.M.A. Fonseca, A.G.M. Ferreira, J.A.P. Coutinho

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333 Citations (Scopus)

Abstract

This work addresses the experimental measurements of the pressure (0.10 <p/MPa <10.0) and temperature (293.15 <T/K <393.15) dependence of the density and derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, the thermal pressure coefficient, and the pressure dependence of the heat capacity of several imidazolium-based ionic liquids (ILs), namely, 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4]; 3-methyl-1-octylimidazolium tetrafluoroborate, [omim][BF4]; 1-hexyl-3-methylimidazolium hexafluorophosphate, [hmim][PF6]; 3-methyl-1-octylimidazolium hexafluorophosphate, [omim][PF6]; 1-butyl-2,3-dimethylimidazolium hexafluorophosphate, [bmmim][PF6]; and 1-butyl-3-methylimidazolium trifluoromethansulfonate, [bmim][CF3SO3]. These ILs were chosen to provide an understanding of the influence of the cation alkyl chain length, the number of cation substitutions, and the anion influence on the properties under study. The influence of water content in the density was also studied for the most hydrophobic IL used, [omim][PF6]. A simple ideal-volume model was employed for the prediction of the imidazolium molar volumes at ambient conditions, which proved to agree well with the experimental results.
Original languageEnglish
Pages (from-to)80-88
Number of pages9
JournalJournal of Chemical and Engineering Data
Volume52 (1)
Issue number1
DOIs
Publication statusPublished - Jan 2007

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Ionic Liquids
Ionic liquids
Thermodynamic properties
Cations
Positive ions
Compressibility
Chain length
Density (specific gravity)
Water content
Specific heat
Anions
Substitution reactions
Negative ions
Temperature

Cite this

Gardas, R., Freire, M. G., Carvalho, P. J., Marrucho, I. M., Fonseca, I. M. A., Ferreira, A. G. M., & Coutinho, J. A. P. (2007). High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids. Journal of Chemical and Engineering Data, 52 (1)(1), 80-88. https://doi.org/10.1021/je060247x
Gardas, Ramesh ; Freire, M.G. ; Carvalho, P.J. ; Marrucho, I.M. ; Fonseca, I.M.A. ; Ferreira, A.G.M. ; Coutinho, J.A.P. / High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids. In: Journal of Chemical and Engineering Data. 2007 ; Vol. 52 (1), No. 1. pp. 80-88.
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Gardas, R, Freire, MG, Carvalho, PJ, Marrucho, IM, Fonseca, IMA, Ferreira, AGM & Coutinho, JAP 2007, 'High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids', Journal of Chemical and Engineering Data, vol. 52 (1), no. 1, pp. 80-88. https://doi.org/10.1021/je060247x

High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids. / Gardas, Ramesh; Freire, M.G.; Carvalho, P.J.; Marrucho, I.M.; Fonseca, I.M.A.; Ferreira, A.G.M.; Coutinho, J.A.P.

In: Journal of Chemical and Engineering Data, Vol. 52 (1), No. 1, 01.2007, p. 80-88.

Research output: Contribution to journalArticle

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T1 - High-Pressure Densities and Derived Thermodynamic Properties of Imidazolium-Based Ionic Liquids

AU - Gardas, Ramesh

AU - Freire, M.G.

AU - Carvalho, P.J.

AU - Marrucho, I.M.

AU - Fonseca, I.M.A.

AU - Ferreira, A.G.M.

AU - Coutinho, J.A.P.

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AB - This work addresses the experimental measurements of the pressure (0.10 <p/MPa <10.0) and temperature (293.15 <T/K <393.15) dependence of the density and derived thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, the thermal pressure coefficient, and the pressure dependence of the heat capacity of several imidazolium-based ionic liquids (ILs), namely, 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4]; 3-methyl-1-octylimidazolium tetrafluoroborate, [omim][BF4]; 1-hexyl-3-methylimidazolium hexafluorophosphate, [hmim][PF6]; 3-methyl-1-octylimidazolium hexafluorophosphate, [omim][PF6]; 1-butyl-2,3-dimethylimidazolium hexafluorophosphate, [bmmim][PF6]; and 1-butyl-3-methylimidazolium trifluoromethansulfonate, [bmim][CF3SO3]. These ILs were chosen to provide an understanding of the influence of the cation alkyl chain length, the number of cation substitutions, and the anion influence on the properties under study. The influence of water content in the density was also studied for the most hydrophobic IL used, [omim][PF6]. A simple ideal-volume model was employed for the prediction of the imidazolium molar volumes at ambient conditions, which proved to agree well with the experimental results.

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U2 - 10.1021/je060247x

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