Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 15, 2014
Previous Article Next Article

Densities and low pressure solubilities of carbon dioxide in five promising ionic liquids

Author affiliations

Abstract

Ionic liquids are presently considered the most energy-efficient and environmentally benign solvents for CO2 capture. This research aimed at measuring the solubility of CO2 in five room temperature ionic liquids, triethylsulfoniumbis(trifluoromethylsulfonyl)imide ([S222][Tf2N]), diethylmethyl(2-methoxy ethyl)-ammonium bis(trifluoromethylsulfonyl)imide ([deme][Tf2N]), 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([pmim][Tf2N]), 1-allyl-3-methylimidazolium bis-(trifluoromethyl sulfonyl)imide ([amim][Tf2N]), and 1-butyl-4-methylpyridinium tetrafluoroborate ([4mbp][BF4]) at (313.15, 323.15 and 333.15 K) and at pressures up to 20 bar using a gravimetric microbalance. The experimental solubility data of CO2 in these solvents were well correlated using the Peng–Robinson (PR-EoS), Redlich–Kwong–Soave (SRK-EoS), SRK-EoS with quadratic mixing rules, and the Non-Random Two-Liquid (NRTL) with satisfactory average absolute deviations (AADs). Binary interaction parameters for these correlations were also reported. The absorption of CO2 was prone to diminish in this sequence: [deme][Tf2N] > [pmim][Tf2N] > [amim][Tf2N] > [S222][Tf2N] > [4mbp][BF4]. The four ionic liquids {[deme][Tf2N], [pmim][Tf2N], [amim][Tf2N], and [S222][Tf2N]} are deemed promising due to comparably high CO2 absorption (physical) to other prevalent CO2-absorbing ionic liquids. More interestingly, [deme][Tf2N] is shown to have the highest CO2 solubility among all ammonium-based ionic liquids reported in the literature. In addition, Henry's law constants, enthalpies and entropies of absorption for CO2 in the investigated ionic liquids were also reported.

Graphical abstract: Densities and low pressure solubilities of carbon dioxide in five promising ionic liquids

Back to tab navigation

Article information


Submitted
01 Nov 2013
Accepted
03 Jan 2014
First published
06 Jan 2014

RSC Adv., 2014,4, 7566-7578
Article type
Paper

Densities and low pressure solubilities of carbon dioxide in five promising ionic liquids

T. Nonthanasin, A. Henni and C. Saiwan, RSC Adv., 2014, 4, 7566
DOI: 10.1039/C3RA46339G

Social activity

Search articles by author

Spotlight

Advertisements