Ideal Gas Solubilities and Solubility Selectivities in a Binary Mixture of Room-Temperature Ionic Liquids

This study focuses on the solubility behaviors of CO2, CH4, and N2 gases in binary mixtures of imidazolium-based room-temperature ionic liquids (RTILs) using 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][Tf2N]) and 1-ethyl-3-methylimidazolium tetrafluoroborate ([C2mim][BF4])...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2008-02, Vol.112 (8), p.2335-2339
Main Authors: Finotello, Alexia, Bara, Jason E, Narayan, Suguna, Camper, Dean, Noble, Richard D
Format: Article
Language:English
Subjects:
AMBIENT TEMPERATURE
BINARY MIXTURES
CARBON DIOXIDE
ENVIRONMENTAL SCIENCES
GASES
IMIDAZOLES
IONIC COMPOSITION
LIQUIDS
METHANE
NITROGEN
SPECIFICITY
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Summary:This study focuses on the solubility behaviors of CO2, CH4, and N2 gases in binary mixtures of imidazolium-based room-temperature ionic liquids (RTILs) using 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][Tf2N]) and 1-ethyl-3-methylimidazolium tetrafluoroborate ([C2mim][BF4]) at 40 °C and low pressures (∼1 atm). The mixtures tested were 0, 25, 50, 75, 90, 95, and 100 mol % [C2mim][BF4] in [C2mim][Tf2N]. Results show that regular solution theory (RST) can be used to describe the gas solubility and selectivity behaviors in RTIL mixtures using an average mixture solubility parameter or an average measured mixture molar volume. Interestingly, the solubility selectivity, defined as the ratio of gas mole fractions in the RTIL mixture, of CO2 with N2 or CH4 in pure [C2mim][BF4] can be enhanced by adding 5 mol % [C2mim][Tf2N].
ISSN:1520-6106
1520-5207
DOI:10.1021/jp075572l