Improvement in the separation efficiency of transesterification reaction compounds by the use of supported ionic liquid membranes based on the dicyanamide anion

The separation of CO2/N2 by supported ionic liquid membranes (SILMs) is presented. SILMs have been developed by impregnation of the ceramic support nanopores of commercial PDMS (polidimethylosiloxane) membranes (made by Pervatech BV) and commercial microfiltration membranes (made by Inopor) with 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]). Comparison of separation efficiency of SILMs prepared on the same ceramic support shows that SILMs based on PDMS membranes show good stability and very high CO2/N2 selectivity. Yhe obtained results present an inexpensive alternative in selective CO2/N2 separation by SILMs, especially when the choice of selectivity is the first priority. The comparison with Robeson upper bond correlation and literature data shows that applying the ionic liquid and appropriate impregnating method to the PDMS membranes results in significant improvement of separation performance.

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On the importance of the nature of the ionic liquids in the selective simultaneous separation of the substrates and products of a transesterification reaction through supported ionic liquid membranes

Journal of Membrane Science ◽

10.1016/j.memsci.2007.09.020 ◽

2008 ◽

Vol 307 (2) ◽

pp. 233-238 ◽

Cited By ~ 33

Author(s):

Antonia P. de los Ríos ◽

Francisco J. Hernández-Fernández ◽

Francisca Tomás-Alonso ◽

Manuel Rubio ◽

Demetrio Gómez ◽

...

Keyword(s):

Ionic Liquid ◽

Ionic Liquids ◽

Transesterification Reaction ◽

Liquid Membranes ◽

Supported Ionic Liquid ◽

Simultaneous Separation ◽

Supported Ionic Liquid Membranes

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Investigating the Proton and Ion Transfer Properties of Supported Ionic Liquid Membranes Prepared for Bioelectrochemical Applications Using Hydrophobic Imidazolium-Type Ionic Liquids

Membranes ◽

10.3390/membranes11050359 ◽

2021 ◽

Vol 11 (5) ◽

pp. 359

Author(s):

László Koók ◽

Piroska Lajtai-Szabó ◽

Péter Bakonyi ◽

Katalin Bélafi-Bakó ◽

Nándor Nemestóthy

Keyword(s):

Mass Transfer ◽

Ionic Liquid ◽

Ionic Liquids ◽

Microbial Fuel Cells ◽

Transport Numbers ◽

Liquid Membranes ◽

Ion Transfer ◽

Supported Ionic Liquid ◽

Supported Ionic Liquid Membranes ◽

Transfer Properties

Hydrophobic ionic liquids (IL) may offer a special electrolyte in the form of supported ionic liquid membranes (SILM) for microbial fuel cells (MFC) due to their advantageous mass transfer characteristics. In this work, the proton and ion transfer properties of SILMs made with IL containing imidazolium cation and [PF6]− and [NTf2]− anions were studied and compared to Nafion. It resulted that both ILs show better proton mass transfer and diffusion coefficient than Nafion. The data implied the presence of water microclusters permeating through [hmim][PF6]-SILM to assist the proton transfer. This mechanism could not be assumed in the case of [NTf2]− containing IL. Ion transport numbers of K+, Na+, and H+ showed that the IL with [PF6]− anion could be beneficial in terms of reducing ion transfer losses in MFCs. Moreover, the conductivity of [bmim][PF6]-SILM at low electrolyte concentration (such as in MFCs) was comparable to Nafion.

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