High pressure CO2 solubility in N-methyl-2-hydroxyethylammonium protic ionic liquids
authors Mattedi, S; Carvalho, PJ; Coutinho, JAP; Alvarez, VH; Iglesias, M
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords Bronsted ionic liquids; Protic ionic liquids; Carbon dioxide; Supercritical; N-methyl-2-hydroxyethylammonium acetate; N-methyl-2-hydroxyethylammonium formate; Solubility
keywords 2-HYDROXY ETHYLAMMONIUM FORMATE; PHYSICAL-PROPERTIES; CARBON-DIOXIDE; ELEVATED PRESSURES; PHASE-EQUILIBRIA; MIXTURES; TEMPERATURE; SOLVENTS; BEHAVIOR; METHANE
abstract The use of ionic liquids for CO2 capture and natural gas sweetening is being object of intense research. Within the enormous group of existing ionic liquids, those based on conjugate bases of carboxylic acids seem to be particularly promising. This work addresses the study of the high pressure CO2 solubility (up to 80 MPa) in two protic ionic liquids, N-methyl-2-hydroxyethylammonium formate and N-methyl-2-hydroxyethylammonium acetate, in a wide range of temperatures (293-353 K). A thermodynamic model based on the Peng-Robinson equation of state with the Wong-Sandler mixing rule, using the NRTL model for the activity coefficients, was here adopted to describe and evaluate the thermodynamic consistency of the experimental data. Furthermore, the study of a ternary mixture of CO2 + CH4 + N-methyl-2-hydroxyethylammonium acetate was investigated showing a high selectivity from the IL towards these solutes. (C) 2010 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2011
volume 56
issue 3
beginning page 224
ending page 230
digital object identifier (doi) 10.1016/j.supflu.2010.10.043
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000289219100002
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