Towards the potential of cyano and amino acid-based ionic liquid mixtures for facilitated CO sub(2) transport membranes

Aiming at developing improved liquid phases for facilitated CO sub(2) separation from post-combustion processes through supported ionic liquid membranes (SILMs), this work explores the use of binary equimolar IL mixtures containing a common imidazolium cation combined with tricyanomethane and five a...

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Bibliographic Details
Published in:Journal of membrane science 2016-07, Vol.510, p.174-181
Main Authors: Gouveia, Andreia SL, Tome, Liliana C, Marrucho, Isabel M
Format: Article
Language:English
Subjects:
Anions
Carbon dioxide
Differentials
Ionic liquids
Liquid phases
Membranes
Permeability
Separation
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Summary:Aiming at developing improved liquid phases for facilitated CO sub(2) separation from post-combustion processes through supported ionic liquid membranes (SILMs), this work explores the use of binary equimolar IL mixtures containing a common imidazolium cation combined with tricyanomethane and five amino acid-based anions, glycinate, l-alaninate, taurinate, l-serinate and l-prolinate. The CO sub(2) and N sub(2) permeation properties of the prepared SILMs were determined at T=318.15 K and several trans-membrane pressure differentials. The results indicate that as the trans-membrane pressure differential decrease, the CO sub(2) permeability through the SILMs containing the IL mixtures approaches or even surpasses that of the pure [C sub(2)mim][C(CN) sub(3)]. Similarly, the CO sub(2)/N sub(2) permselectivity significantly increases, meaning that the prepared IL mixtures work as CO sub(2) carriers under low trans-membrane pressure differentials, facilitating the flux of CO sub(2) through SILMs. In particular, large CO sub(2) permeabilities and high CO sub(2)/N sub(2) permselectivities were obtained for the IL mixtures containing l-alaninate and taurinate anions, indicating that they can be considered as promising and efficient liquid phases for facilitated CO sub(2) separation.
ISSN:0376-7388
DOI:10.1016/j.memsci.2016.03.008