High pressure CO2 absorption studies on imidazolium-based ionic liquids: Experimental and simulation approaches

Ferdi Karadas, Banu Köz, J. Jacquemin, Erhan Deniz, David Rooney, Jillian Thompson, Cafer T. Yavuz, Majeda Khraisheh, Santiago Aparicio, Mert Atihan

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

A combined experimental-computational study on the CO absorption on 1-butyl-3-methylimidazolium hexafluophosphate, 1-ethyl-3-methylimidazolium bis[trifluoromethylsulfonyl]imide, and 1-butyl-3-methylimidazolium bis[trifluoromethylsulfonyl]imide ionic liquids is reported. The reported results allowed to infer a detailed nanoscopic vision of the absorption phenomena as a function of pressure and temperature. Absorption isotherms were measured at 318 and 338K for pressures up to 20MPa for ultrapure samples using a state-of-the-art magnetic suspension densimeter, for which measurement procedures are developed. A remarkable swelling effect upon CO absorption was observed for pressures higher than 10MPa, which was corrected using a method based on experimental volumetric data. The experimental data reported in this work are in good agreement with available literature isotherms. Soave-Redlich-Kwong and Peng-Robinson equations of state coupled with bi-parametric van der Waals mixing rule were used for successful correlations of experimental high pressure absorption data. Molecular dynamics results allowed to infer structural, energetic and dynamic properties of the studied CO+ionic liquids mixed fluids, showing the relevant role of the strength of anion-cation interactions on fluid volumetric properties and CO absorption.
Original languageEnglish
Pages (from-to)74-86
JournalFluid Phase Equilibria
Volume351
Early online date01 Nov 2012
DOIs
Publication statusPublished - 05 Aug 2013

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