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Received February 7, 2014
Accepted April 1, 2014
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Experimental determination and prediction of phase behavior for 1-butyl-3-methylimidazolium nonafluorobutyl sulfonate and carbon dioxide
Department of Biological and Chemical Engineering, Hongik University, Sejong 339-701, Korea 1Department of Chemistry, Shivaji University, Kolhapur 416 004, India
Korean Journal of Chemical Engineering, September 2014, 31(9), 1656-1660(5), 10.1007/s11814-014-0097-0
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Abstract
The vapor-liquid equilibrium of the binary system CO2+1-butyl-3-methylimidazolium nonafluorobutyl sulfonate ([BMIM][NfO]) was measured over a temperature range of 298.2-323.2 K at intervals of 5.0 K for CO2 mole fraction ranging from 0.137 to 0.900 using a high-pressure variable-volume view cell. The Peng-Robinson equation of state was then applied with two-parameter mixing rules over the same range and the results compared with the experimentally_x000D_
obtained data. Increasing the alkyl chain length in perfluorinated sulfonate from methyl to butyl markedly increased the CO2 solubility. To investigate the effect of the number of fluorine atoms in the anion on the phase behavior of imidazolium based ionic liquid, these experimental results were then compared with those reported in previous experimental studies of 1-alkyl-3-methylimidazolium cations and with modeling data. It looks likely that both the number of fluorine atoms in the anion and the presence of S=O groups play an important role in designing CO2-philic molecules.
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Wappel D, Gronald G, Kalb R, Draxler J, Int’l. J. Greenhouse Gas Control, 4, 486 (2010)
Seo DW, Lim YD, Lee SH, Ur SC, Kim WG, Bull. Korean Chem. Soc., 32, 2633 (2011)
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Aki SNVK, Mellein BR, Saurer EM, Brennecke JF, J. Phys. Chem. B, 108(52), 20355 (2004)
Shin EK, Lee BC, J. Chem. Eng. Data, 53(12), 2728 (2008)
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Valderrama JO, Sanga WW, Lazzus JA, Ind. Eng. Chem. Res., 47(4), 1318 (2008)
