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Title: Room-temperature ionic liquids: temperature dependence of gas solubility selectivity

Abstract

This study focuses on bulk fluid solubility of carbon dioxide (CO{sub 2}), methane (CH{sub 4}), hydrogen (H{sub 2}), and nitrogen (N{sub 2}) gases in the imidazolium-based RTILs: 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ((emim)(Tf{sub 2}N)),1-ethyl-3-methylimidazolium tetrafluoroborate ((emim)(BF{sub 4})),1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide((hmim)(Tf{sub 2}N)), and 1,3-dimethylimidazolium methyl sulfate ((mmim)(MeSO{sub 4})) as a function of temperature (25, 40, 55, and 70{sup o}C) at near-atmospheric pressures. The experimental behaviors are explained in terms of thermodynamic relationships that account for the negligible vapor pressure of the RTIL as well as the low solubilities of the gases. Results show that, as temperature increases, the solubility of CO{sub 2} decreases in all RTILs, the solubility of CH{sub 4} remains constant in (emim)(Tf{sub 2}N) and (hmim)(Tf{sub 2}N) but increases in(mmim)(MeSO{sub 4}) and (emim)(BF{sub 4}), and the solubility of N{sub 2} and H{sub 2} increases. Also, the ideal solubility selectivity (ratio of pure-component solubilities) increases as temperature decreases for CO{sub 2}/N{sub 2}, CO{sub 2}/CH{sub 4}, and CO{sub 2}/H{sub 2} systems. Experimental values for the enthalpy and entropy of solvation are reported.

Authors:
; ; ;  [1]
  1. University of Colorado, Boulder, CO (United States). Department of Chemical and Biological Engineering
Publication Date:
OSTI Identifier:
21212851
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 47; Journal Issue: 10; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CARBON DIOXIDE; METHANE; HYDROGEN; NITROGEN; IMIDAZOLES; TEMPERATURE DEPENDENCE; SOLUBILITY; ENTHALPY; ENTROPY; SPECIFICITY; GASES; AMBIENT TEMPERATURE; IONIC COMPOSITION; LIQUIDS

Citation Formats

Finotello, Alexia, Bara, Jason E, Camper, Dean, and Noble, Richard D. Room-temperature ionic liquids: temperature dependence of gas solubility selectivity. United States: N. p., 2008. Web. doi:10.1021/ie0704142.
Finotello, Alexia, Bara, Jason E, Camper, Dean, & Noble, Richard D. Room-temperature ionic liquids: temperature dependence of gas solubility selectivity. United States. https://doi.org/10.1021/ie0704142
Finotello, Alexia, Bara, Jason E, Camper, Dean, and Noble, Richard D. 2008. "Room-temperature ionic liquids: temperature dependence of gas solubility selectivity". United States. https://doi.org/10.1021/ie0704142.
@article{osti_21212851,
title = {Room-temperature ionic liquids: temperature dependence of gas solubility selectivity},
author = {Finotello, Alexia and Bara, Jason E and Camper, Dean and Noble, Richard D},
abstractNote = {This study focuses on bulk fluid solubility of carbon dioxide (CO{sub 2}), methane (CH{sub 4}), hydrogen (H{sub 2}), and nitrogen (N{sub 2}) gases in the imidazolium-based RTILs: 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ((emim)(Tf{sub 2}N)),1-ethyl-3-methylimidazolium tetrafluoroborate ((emim)(BF{sub 4})),1-n-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide((hmim)(Tf{sub 2}N)), and 1,3-dimethylimidazolium methyl sulfate ((mmim)(MeSO{sub 4})) as a function of temperature (25, 40, 55, and 70{sup o}C) at near-atmospheric pressures. The experimental behaviors are explained in terms of thermodynamic relationships that account for the negligible vapor pressure of the RTIL as well as the low solubilities of the gases. Results show that, as temperature increases, the solubility of CO{sub 2} decreases in all RTILs, the solubility of CH{sub 4} remains constant in (emim)(Tf{sub 2}N) and (hmim)(Tf{sub 2}N) but increases in(mmim)(MeSO{sub 4}) and (emim)(BF{sub 4}), and the solubility of N{sub 2} and H{sub 2} increases. Also, the ideal solubility selectivity (ratio of pure-component solubilities) increases as temperature decreases for CO{sub 2}/N{sub 2}, CO{sub 2}/CH{sub 4}, and CO{sub 2}/H{sub 2} systems. Experimental values for the enthalpy and entropy of solvation are reported.},
doi = {10.1021/ie0704142},
url = {https://www.osti.gov/biblio/21212851}, journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 10,
volume = 47,
place = {United States},
year = {Thu May 15 00:00:00 EDT 2008},
month = {Thu May 15 00:00:00 EDT 2008}
}