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Title: Ring Opened Heterocycles: Promising Ionic Liquids for Gas Separation and Capture

Abstract

We report on a new class of highly fluid ionic liquids integrating a cation that resembles an opened imidazolium structure with two distinct anions, bis(trifluoromethylsulfonyl)imide, [Tf{sub 2}N], and a nitrile-containing anion, [C(CN)3]. These new ionic liquids show exceptional CO{sub 2} permeability values in liquid membrane gas separations with results that equal or exceed the Robeson upper bound. Moreover, these ionic liquids offer ideal CO{sub 2}/N{sub 2} selectivities competitive with the best results reported to date, exhibiting values that range from 28 to 45. The nitrile containing ionic liquid displayed the highest ideal CO{sub 2}/N{sub 2} selectivity with a value of 45 which primarily results from a reduction in the nitrogen permeability. In addition to permeability results, CO{sub 2} solubilities were also measured for the this new class of ionic liquids with values similar to the popular 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The CO{sub 2} solubility results were compared to predicted values obtained using both a modified regular solution theory and the quantum chemical Conductor-like Screening Model for Real Solvents (COSMO-RS) method. Agreement between predicted and measured solubility values is also discussed.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1036574
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 401-402; Journal ID: ISSN 0376-7388
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ANIONS; CATIONS; MEMBRANES; MOLTEN SALTS; NITRILES; NITROGEN; PERMEABILITY; SOLUBILITY; SOLVENTS

Citation Formats

Mahurin, Shannon Mark, Yeary, Joshua S, Baker, Sheila N, Jiang, Deen, Dai, Sheng, and Baker, Gary A. Ring Opened Heterocycles: Promising Ionic Liquids for Gas Separation and Capture. United States: N. p., 2012. Web. doi:10.1016/j.memsci.2012.01.042.
Mahurin, Shannon Mark, Yeary, Joshua S, Baker, Sheila N, Jiang, Deen, Dai, Sheng, & Baker, Gary A. Ring Opened Heterocycles: Promising Ionic Liquids for Gas Separation and Capture. United States. https://doi.org/10.1016/j.memsci.2012.01.042
Mahurin, Shannon Mark, Yeary, Joshua S, Baker, Sheila N, Jiang, Deen, Dai, Sheng, and Baker, Gary A. Sun . "Ring Opened Heterocycles: Promising Ionic Liquids for Gas Separation and Capture". United States. https://doi.org/10.1016/j.memsci.2012.01.042.
@article{osti_1036574,
title = {Ring Opened Heterocycles: Promising Ionic Liquids for Gas Separation and Capture},
author = {Mahurin, Shannon Mark and Yeary, Joshua S and Baker, Sheila N and Jiang, Deen and Dai, Sheng and Baker, Gary A},
abstractNote = {We report on a new class of highly fluid ionic liquids integrating a cation that resembles an opened imidazolium structure with two distinct anions, bis(trifluoromethylsulfonyl)imide, [Tf{sub 2}N], and a nitrile-containing anion, [C(CN)3]. These new ionic liquids show exceptional CO{sub 2} permeability values in liquid membrane gas separations with results that equal or exceed the Robeson upper bound. Moreover, these ionic liquids offer ideal CO{sub 2}/N{sub 2} selectivities competitive with the best results reported to date, exhibiting values that range from 28 to 45. The nitrile containing ionic liquid displayed the highest ideal CO{sub 2}/N{sub 2} selectivity with a value of 45 which primarily results from a reduction in the nitrogen permeability. In addition to permeability results, CO{sub 2} solubilities were also measured for the this new class of ionic liquids with values similar to the popular 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The CO{sub 2} solubility results were compared to predicted values obtained using both a modified regular solution theory and the quantum chemical Conductor-like Screening Model for Real Solvents (COSMO-RS) method. Agreement between predicted and measured solubility values is also discussed.},
doi = {10.1016/j.memsci.2012.01.042},
url = {https://www.osti.gov/biblio/1036574}, journal = {Journal of Membrane Science},
issn = {0376-7388},
number = ,
volume = 401-402,
place = {United States},
year = {2012},
month = {1}
}