Solubility of Carbon Dioxide in the Ionic Liquid 1-Ethyl-3-methylimidazolium Tris(pentafluoroethyl)trifluorophosphate

Recently, the use of ionic liquids (ILs) for gas separation processes has attracted much attention because of the high solubility of different gaseous species in ILs. This contribution presents new experimental measurements of the carbon dioxide (CO2) solubility in the IL 1-ethyl-3 methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([emim][FAP]). This solubility has been determined by measuring the bubble point pressures of the binary mixture of [emim][FAP] + CO2 for CO2 concentrations ranging from (10.03 to 60.00) mol % and within a temperature range of (283.75 to 364.13) K using a synthetic method. The obtained values are compared to the solubilities of CO2 in other 1-ethyl-3-methylimidazolium based ILs, to study the effect of the anion. This comparison shows that the solubility of CO2 in the various ILs decreases in the order: [emim][FAP] > [emim][Tf2N] > [emim][EtSO4] = [emim][PF6] > [emim][BF4]. Therefore, the use of [emim][FAP] results in highest absorptive capacity, which makes this IL an a...

[1]  Roland Kalb,et al.  Ionic liquids for post-combustion CO2 absorption , 2010 .

[2]  A. Mehdizadeh,et al.  Solubility and Diffusion of H2S and CO2 in the Ionic Liquid 1-(2-Hydroxyethyl)-3-methylimidazolium Tetrafluoroborate , 2010 .

[3]  C. Ghotbi,et al.  Solubility of H2S in ionic liquids [hmim][PF6], [hmim][BF4], and [hmim][Tf2N] , 2009 .

[4]  Sona Raeissi,et al.  Carbon Dioxide Solubility in the Homologous 1-Alkyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide Family , 2009 .

[5]  Cj Cor Peters,et al.  A potential ionic liquid for CO2-separating gas membranes: selection and gas solubility studies , 2009 .

[6]  Meng-Hui Li,et al.  Solubility of Carbon Dioxide in 1-Ethyl-3-methylimidazolium Tetrafluoroborate , 2008 .

[7]  Ichiro Minami,et al.  The Tribological Properties of Ionic Liquids Composed of Trifluorotris(pentafluoroethyl) Phosphate as a Hydrophobic Anion , 2008 .

[8]  C. Peters,et al.  Solubility of carbon dioxide in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide , 2007 .

[9]  J. Brennecke,et al.  Improving carbon dioxide solubility in ionic liquids. , 2007, The journal of physical chemistry. B.

[10]  G. Maurer,et al.  Solubility of CO2 in the ionic liquid [hmim][Tf2N] , 2006 .

[11]  Xiangping Zhang,et al.  Solubility of CO2 in imidazolium-based tetrafluoroborate ionic liquids , 2006 .

[12]  B. Berne,et al.  Why is the partial molar volume of CO2 so small when dissolved in a room temperature ionic liquid? Structure and dynamics of CO2 dissolved in [Bmim+] [PF6(-)]. , 2005, Journal of the American Chemical Society.

[13]  J. Brennecke,et al.  High-Pressure Phase Behavior of Carbon Dioxide with Imidazolium-Based Ionic Liquids , 2004 .

[14]  Paul Scovazzo,et al.  Gas separations using non-hexafluorophosphate [PF6]− anion supported ionic liquid membranes , 2004 .

[15]  Cor J. Peters,et al.  High-pressure phase behavior of systems with ionic liquids: II. The binary system carbon dioxide+1-ethyl-3-methylimidazolium hexafluorophosphate , 2004 .

[16]  J. Brennecke,et al.  Why Is CO2 so soluble in imidazolium-based ionic liquids? , 2004, Journal of the American Chemical Society.

[17]  Poovathinthodiyil Raveendran,et al.  Exploring CO2-Philicity: Effects of Stepwise Fluorination , 2003 .

[18]  Ioanna Ntai,et al.  CO(2) capture by a task-specific ionic liquid. , 2002, Journal of the American Chemical Society.

[19]  Joan F. Brennecke,et al.  High-Pressure Phase Behavior of Ionic Liquid/CO2 Systems , 2001 .

[20]  Sheng Dai,et al.  Low-Pressure Solubility of Carbon Dioxide in Room-Temperature Ionic Liquids Measured with a Quartz Crystal Microbalance , 2004 .

[21]  Robin D. Rogers,et al.  Characterization and comparison of hydrophilic and hydrophobic room temperature ionic liquids incorporating the imidazolium cation , 2001 .

[22]  Brian J. Briscoe,et al.  Combining ionic liquids and supercritical fluids: in situ ATR-IR study of CO2 dissolved in two ionic liquids at high pressures , 2000 .