TY - JOUR
T1 - Gas separations using non-hexafluorophosphate [PF6]- anion supported ionic liquid membranes
AU - Scovazzo, Paul
AU - Kieft, Jesse
AU - Finan, Daniel A.
AU - Koval, Carl
AU - DuBois, Dan
AU - Noble, Richard
N1 - Funding Information:
The authors thank Steward Forsyth and the Centre for Green Chemistry, School of Chemistry, Monash University, Victoria, Australia, for synthesizing the [emim][dca]. We also thank Dr. Warren Oldham of the Los Alamos National Laboratory for supplying the [emim][Tf 2 N]. D.L. DuBois would like to acknowledge the support of the US Department of Energy, Office of Science, Chemical Sciences Division under DOE contract No. DE-AC36-99GO10337. We thank Alex Miedaner of the National Renewable Energy Laboratory, Golden, CO, for supplying the [emim][CF 3 SO 3 ]. The United States National Science Foundation (NSF) Center for Membrane Applied Science and Technology (MAST) supported this research.
PY - 2004/7/15
Y1 - 2004/7/15
N2 - Previously, we reported on using Room temperature ionic liquids (RTILs) in place of traditional solvents for supported liquid membranes to take advantage of their unique properties. This previous work used RTILs with the hexafluorophosphate [PF6]- anion. However, the [PF 6]- anion in the presence of water can break down into HF. In the current work, we studied RTIL-membranes made from the following water stable anions: bis(trifluoromethanesulfonyl)amide [Tf2N]-, trifluoromethanesulfone [CF3SO3]-, chloride [Cl]-, and dicyanamide [dca]-. We report CO2 permeabilities of 350 barrers (for [Cl]-) to 1000 barrers (for [Tf2N]-) combined with CO2/N2 ideal selectivities of 15 (for [Cl]-) to 61 (for [dca]-). Note that these permeability/selectivities place RTIL-membranes above the upper-bound in a CO2/N2 Robeson plot of representative polymers. The CO2/CH4 ideal selectivities range from 4 (for [Cl] -) to 20 (for [dca]-), thereby placing the [dca]-membrane above the upper-bound for the CO2/CH4 Robeson plot.
AB - Previously, we reported on using Room temperature ionic liquids (RTILs) in place of traditional solvents for supported liquid membranes to take advantage of their unique properties. This previous work used RTILs with the hexafluorophosphate [PF6]- anion. However, the [PF 6]- anion in the presence of water can break down into HF. In the current work, we studied RTIL-membranes made from the following water stable anions: bis(trifluoromethanesulfonyl)amide [Tf2N]-, trifluoromethanesulfone [CF3SO3]-, chloride [Cl]-, and dicyanamide [dca]-. We report CO2 permeabilities of 350 barrers (for [Cl]-) to 1000 barrers (for [Tf2N]-) combined with CO2/N2 ideal selectivities of 15 (for [Cl]-) to 61 (for [dca]-). Note that these permeability/selectivities place RTIL-membranes above the upper-bound in a CO2/N2 Robeson plot of representative polymers. The CO2/CH4 ideal selectivities range from 4 (for [Cl] -) to 20 (for [dca]-), thereby placing the [dca]-membrane above the upper-bound for the CO2/CH4 Robeson plot.
KW - [CF SO]
KW - [Cl]
KW - [bmim][PF]
KW - [dca]
KW - [emim][Tf N]
KW - butylmethylimidazolium hexafluorophosphate
KW - chloride anion
KW - dicyanamide anion
KW - trifluoromethanesulfone anion
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U2 - 10.1016/j.memsci.2004.02.033
DO - 10.1016/j.memsci.2004.02.033
M3 - Article
AN - SCOPUS:2942574358
VL - 238
SP - 57
EP - 63
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
IS - 1-2
ER -