Polyethyleneimine-functionalized phenolphthalein-based cardo poly(ether ether ketone) membrane for CO2 separation

Publication date: 25 March 2020Source: Journal of Industrial and Engineering Chemistry, Volume 83Author(s): Yunwu Yu, Junhai Wang, Yan Wang, Wenhao Pan, Changwei Liu, Peng Liu, Lianjie Liang, Changwei Xu, Yunxue LiuAbstractPhenolphthalein-based cardo poly(ether ether ketone) (PEEKWC)/polyethyleneimine (PEI) crosslinking membranes were prepared by solution casting followed by solution reaction at room temperature. The effects of reaction time and PEI content on the membrane structure and gas separation performances were investigated. Light transmittance measure and AFM evidenced the relationship between the microphase separation in PEEKWC-PEI membranes and reaction time. The CO2 permeability increased with the PEI content, while the N2 and CH4 permeability remained nearly constant. This result indicated that only CO2 was transported by the solution–diffusion mechanism and also that PEI exhibited a positive contribution as a fixed carrier for CO2 facilitated transport. Meanwhile the PEEKWC-PEI crosslinking membranes showed higher selectivities than the pure PEEKWC membrane. The highest CO2/N2 and CO2/CH4 selectivities were about 131 and 122 increasing from 33 and 30, respectively. The crosslinking structure of membranes improved the CO2 permeability stability.Graphical abstract

Source: Journal of Industrial and Engineering Chemistry - January 27, 2020 Category: Chemistry Source Type: research