High-pressure phase Behavior of systems with ionic liquids: Part V. The binary system carbon dioxide+1-butyl-3-methylimidazolium tetrafluoroborate

被引:154
作者
Kroon, MC
Shariati, A
Costantini, M
van Spronsen, J
Witkamp, GJ
Sheldon, RA
Peters, CJ
机构
[1] Delft Univ Technol, Fac Sci Appl, Dept Chem Technol, NL-2628 BL Delft, Netherlands
[2] Univ Trieste, Dept Chem Environm & Raw Mat Engn, I-34127 Trieste, Italy
[3] Delft Univ Technol, Fac Mech Engn, Dept Proc & Energy, Lab Proc Equipment, NL-2628 CA Delft, Netherlands
关键词
D O I
10.1021/je049753h
中图分类号
O414.1 [热力学];
学科分类号
摘要
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 two-phase 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.
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页码:173 / 176
页数:4
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