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Title: Supported bicyclic amidine ionic liquids as a potential CO2/N2 separation medium

Journal Article · · Journal of Membrane Science
 [1]; ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry. Joint Inst. for Advanced Materials
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Univ. of California, Riverside, CA (United States). Dept. of Chemistry
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry. Joint Inst. for Advanced Materials; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division

In this paper, five new room temperature ionic liquids were tested as supported ionic liquid membranes (SILMs) for CO2/N2 separation capability. This series of ionic liquids (ILs) contains bicyclic amidine cations of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) with small alkyl chain substituents. These ILs have been synthesized to examine the effects of cation structure on free volume. Relevant physical and chemical properties have been examined, including CO2 solubility and viscosity. The relationship between fractional free volume and permeability of gases is explored, with an interesting note on solubility. Each cation was paired with two different anions: bis(trifluoromethanesulfonyl)imide and tetracyanoborate, for further investigation of the cation-anion interaction on SILM permeability and selectivity. Finally, three of these new ILs have exceeded Robeson's upper bound for CO2/N2 gas separations.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1468162
Alternate ID(s):
OSTI ID: 1693501
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 565; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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