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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Improvement of carbon dioxide absorption by mixing poly(ethylene glycol) dimethyl ether with ammonium-based ionic liquids

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Lepre, L. F. [1] ; Pison, L. [2, 3] ; Siqueira, L. J. A. [4] ; Ando, R. A. [1] ; Gomes, M. F. Costa [2, 3]
Total Authors: 5
[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Lab Espect Mol, CP 26077, BR-05513970 Sao Paulo - Brazil
[2] CNRS, Inst Chim Clermont Ferrand, BP 80026, F-63171 Aubiere - France
[3] Univ Clermont Auvergne, BP 80026, F-63171 Aubiere - France
[4] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Dept Ciencias Exatas & Terra, Lab Mat Hibridos, BR-09913030 Diadema - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Separation and Purification Technology; v. 196, n. SI, p. 10-19, MAY 8 2018.
Web of Science Citations: 9

Mixtures of the ionic liquid butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, {[}N-4111]{[}NTf2] with poly(ethylene oxide) polymers, PEO, of different molecular weights were investigated for CO2 capture. The liquid mixtures are close to ideal in terms of their volumetric properties but their enthalpies of mixing are negative, decreasing when the size of the polymer chain increases and being close to those observed for associative compounds mixed with ionic liquids (Delta H-mix = -7 kJ mol(-1) for {[}N-4111]{[}NTf2] + PEO1000 at 318 K). The favorable interactions between the polymer and the ionic liquid could be related to the dynamic properties of the mixtures, especially for mixtures of polymers of longer chain sizes which have a higher viscosity than that of the pure mixture components. Raman spectroscopy confirmed an association between the cation of the ionic liquid and the polymers that probably surround the cation and thus contribute to slow the dynamics of the mixtures. The increase of the carbon dioxide absorption with the increase of the polymer mole fraction composition in the liquid mixture is explained by the more favorable interactions between the gas and the polymer as evidenced by the analysis of the thermodynamic properties of solvation. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/13119-3 - Vibrational spectroscopy in condensed phases
Grantee:Mauro Carlos Costa Ribeiro
Support type: Research Projects - Thematic Grants
FAPESP's process: 11/22263-8 - CO2 absorption by ionic liquids
Grantee:Rômulo Augusto Ando
Support type: Regular Research Grants
FAPESP's process: 15/07145-0 - Ionic liquids for carbon dioxide capture
Grantee:Luiz Fernando Lepre
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/23234-7 - Ionic Liquids for CO2 Capture: Physical vs. Chemical Absorption.
Grantee:Luiz Fernando Lepre
Support type: Scholarships in Brazil - Doctorate