Facilitated CO2 transport and barrier effect through ionic liquid modified with cyanuric chloride

Abstract

A 1-butyl-3-methyl imidazolium tetrafluoroborate (BMIM⁺BF₄⁻) ionic liquid membrane containing cyanuric chloride as a carrier can be utilized for facilitated CO₂ transport. The cyanuric chloride complex was characterized by Fourier transform (FT) infrared spectroscopy, thermogravimetric analysis, viscosity measurements, and FT-Raman spectroscopy. The BMIM⁺BF₄⁻/cyanuric chloride membrane showed a high CO₂ permeance of 19.2 GPU, in addition to excellent ideal selectivities of 11.0 and 10.7 for CO₂/N₂ and 10.7 for CO₂/CH₄ mixtures, respectively. A barrier effect was observed for CH₄ and N₂, while the amine groups on the imidazolium ring and cyanuric chloride selectively interacted with CO₂ molecules, thus facilitating their transport.