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.