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CO2/N2 separation using alumina supported membranes based on new functionalized ionic liquids

•Supported ionic liquid membranes were studied in the separation of CO2 from N2.•High permselectivity shown by a fluorine-free IL with ideal selectivity of 70.•Permeation tests were carried out using pure gases at 1bar pressure.•The carbamate formed, during reaction of SILM with CO2, was stable up t...

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Bibliographic Details
Published in:Separation and purification technology 2017, Vol.182, p.59-68
Main Authors: Sánchez Fuentes, Cinthia E., Guzmán-Lucero, Diego, Torres-Rodriguez, Miguel, Likhanova, Natalya V., Bolaños, Juan Navarrete, Olivares-Xometl, Octavio, Lijanova, Irina V.
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Language:English
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Summary:•Supported ionic liquid membranes were studied in the separation of CO2 from N2.•High permselectivity shown by a fluorine-free IL with ideal selectivity of 70.•Permeation tests were carried out using pure gases at 1bar pressure.•The carbamate formed, during reaction of SILM with CO2, was stable up to 200°C. In the present work, supported liquid membranes based on three ionic liquids (ILs) (1-(2-aminoethyl)-3-methylimidazolium trifluoromethanesulfonate ([AEMIm]Tf), 1-(2-aminoethyl)-3-methylimidazolium tetrafluoroborate ([AEMIm]BF4) and trioctylmethylammonium anthranilate ([TOMA])), used as mobile phases, were studied in the separation of carbon dioxide from nitrogen. The IL chemical structures and thermal properties were confirmed by spectroscopic techniques and thermogravimetric analysis (TGA), respectively. The IL homogeneous distribution of the impregnation on alumina tubular supports was determined by scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX). Permeation tests were carried out using pure gases at 30°C and 1bar. The amino-functionalized ILs, two of them in the cation, [AEMIm]BF4 and [AEMIm]Tf, and the other one in the anion, [TOMA]An, reacted with CO2, leading to the formation of carbamates. [TOMA]An, which has the amine group at the anionic part, showed the best permselectivity, reaching a selectivity of 70.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2017.03.031