Towards the potential of cyano and amino acid-based ionic liquid mixtures for facilitated CO2 transport membranes

Andreia S. L. Gouveia, Liliana C. Tomé, Isabel M. Marrucho

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Aiming at developing improved liquid phases for facilitated CO2 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 CO2 and N2 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 CO2 permeability through the SILMs containing the IL mixtures approaches or even surpasses that of the pure [C2mim][C(CN)3]. Similarly, the CO2/N2 permselectivity significantly increases, meaning that the prepared IL mixtures work as CO2 carriers under low trans-membrane pressure differentials, facilitating the flux of CO2 through SILMs. In particular, large CO2 permeabilities and high CO2/N2 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 CO2 separation.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalJournal of Membrane Science
Volume510
DOIs
Publication statusPublished - 15 Jul 2016

Keywords

  • Amino acid- and cyano-based anions
  • CO/N separation
  • Facilitated supported ionic liquid membranes
  • Gas transport
  • Ionic liquid mixtures

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