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KMID : 0385520110240060467
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Analytical Science & Technology
2011 Volume.24 No. 6 p.467 ~ p.476
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Solubility of carbon dioxide in ionic liquids with methylsulfate anion
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Jung Jun-Young
Lee Byung-Chul
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Abstract
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Solubility data of carbon dioxide (CO2) in the imidazolium-based ionic liquids with methylsulfate anion are presented at pressures up to about 45 MPa and at temperatures between 303.15 K and 343.15 K. The ionic liquids studied in this work were 1-ethyl-3-methylimidazolium methylsulfate ([emim][mSO4]), 1-butyl-3-methylimidazolium methylsulfate ([bmim][mSO4]). The solubilities of CO2 were determined by measuring the bubble point or cloud point pressures of the binary mixtures using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. The equilibrium pressure increased very steeply at high CO2 compositions. The CO2 solubility in ionic liquids increased with increase of the total length of alkyl chains attached to the imidazolium cation of the ionic liquids. The phase equilibrium data for the CO2 + ionic liquid 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, imidazolium, methylsulfate, Peng-Robinson equation of state,
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