High-Pressure Phase Behavior of Systems with Ionic Liquids: Part V. The Binary System Carbon Dioxide + 1-Butyl-3-methylimidazolium Tetrafluoroborate
Kroon, M. C. C.[Maaike C.], Shariati, A.[Alireza], Costantini, M.[Marco], Van Spronsen, J.[Jaap], Witkamp, G. J.-J.[Geert-Jan], Sheldon, R. A. A.[Roger A.], Peters, C. J.[Cor J.]
The phase behavior of the binary system consisting of the supercritical fluid carbon dioxide (CO2) and the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) was studied experimentally. A synthetic method was used to measure its phase behavior. Bubble-point pressures of the system CO2 + [bmim][BF4] are reported for carbon dioxide concentrations ranging from (10.22 to 60.17) mole % and within a temperature range of (278.47 to 368.22) K. The CO2 + [bmim][BF4] binary system has a twophase liquid-vapor region extending up to very high pressures. Most likely, the type of fluid-phase behavior is type III according to the classification of Scott and Van Konynenburg. The experimental results obtained were compared with the available phase behavior data of the binary system CO2 + 1-hexyl-3- methylimidazolium tetrafluoroborate ([hmim][BF4]) to investigate the effect of the length of the alkyl group on the phase behavior of this type of system. A larger alkyl group leads to lower bubble-point pressures and, therefore, to higher solubilities of carbon dioxide in the imidazolium-based ionic liquid.
Compounds
#
Formula
Name
1
CO2
carbon dioxide
2
C8H15BF4N2
1-butyl-3-methylimidazolium tetrafluoroborate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.