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

Jennifer A. Schott, Chi Linh Do-Thanh, Shannon M. Mahurin, Ziqi Tian, Nicole C. Onishi, De en Jiang, Sheng Dai

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

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. Three of these new ILs have exceeded Robeson's upper bound for CO2/N2 gas separations.

Original languageEnglish
Pages (from-to)203-212
Number of pages10
JournalJournal of Membrane Science
Volume565
DOIs
StatePublished - Nov 1 2018

Funding

This work was supported by the U.S. Department of Energy , Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division.

Keywords

  • Carbon dioxide
  • Free volume
  • Ionic liquid
  • SILM

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