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

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

Author Lepre, L. F. Google Scholar
Pison, L. Google Scholar
Siqueira, L. J. A. Autor UNIFESP Google Scholar
Ando, R. A. Google Scholar
Gomes, M. F. Costa Google Scholar
Abstract 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.
Keywords Butyltrimethylammonium bis(trifluorome thylsulfonyl)imide
PEO
Excess volume
Mixing enthalpy
Solubility
Carbon dioxide
Raman spectroscopy
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
Grant number FAPESP: 2013/23234-7
FAPESP: 2015/07145-0
FAPESP: 2011/22263-8
FAPESP: 2012/13119-3
Date 2018
Published in Separation And Purification Technology. Amsterdam, v. 196, p. 10-19, 2018.
ISSN 1383-5866 (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Bv
Extent 10-19
Origin http://dx.doi.org/10.1016/j.seppur.2017.07.010
Access rights Closed access
Type Article
Web of Science ID WOS:000427211200003
URI http://repositorio.unifesp.br/handle/11600/46045

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