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KMID : 0385520140270020079
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Analytical Science & Technology
2014 Volume.27 No. 2 p.79 ~ p.91
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High-Pressure Solubility of Carbon Dioxide in 1-Butyl-3-methylpiperidinium Bis(trifluoromethylsulfonyl)imide Ionic Liquid
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Nam Sang-Kyu
Lee Byung-Chul
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Abstract
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Solubility data of carbon dioxide (CO2) in 1-butyl-3-methylpiperidinium bis(trifluoromethylsulfonyl)imide ([bmpip][Tf2N]) ionic liquid are presented at pressures up to about 30 MPa and at temperatures between 303 K and 343 K. As far as we know, the data on the CO2 solubility in the [bmpip][Tf2N] ionic liquid have never been reported in the literature by other investigators. The solubilities of CO2 were determined by measuring the bubble point or cloud point pressures of the CO2 + [bmpip][Tf2N] mixtures with various compositions using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. To observe the effect of the cation composing the ionic liquid on the CO2 solubility, the CO2 solubilities in [bmpip][Tf2N] used in this study were compared with those in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide ([bmim][Tf2N]). As the equilibrium pressure increased, the CO2 solubility in [bmpip][Tf2N] increased sharply. On the other hand, the CO2 solubility decreased with increasing temperature. The mole fraction-based CO2 solubilities were almost the same for both [bmpip][Tf2N] and [bmim][Tf2N], regardless of temperature and pressure. The phase equilibrium data for the CO2 + [bmpip][Tf2N] systems have been correlated using the Peng-Robinson equation of state.
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KEYWORD
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ionic liquid, carbon dioxide, solubility, piperidinium, thermodynamic modeling, Peng-Robinson equation of state,
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