Performance of Multilayer Composite Hollow Membrane in Separation of CO(2) from CH(4) in Mixed Gas Conditions

Composite membranes comprising NH(2)-MIL-125(Ti)/PEBAX coated on PDMS/PSf were prepared in this work, and their gas separation performance for high CO(2) feed gas was investigated under various operating circumstances, such as pressure and CO(2) concentration, in mixed gas conditions. The functional groups and morphology of the prepared membranes were characterized by Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). CO(2) concentration and feed gas pressure were demonstrated to have a considerable impact on the CO(2) and CH(4) permeance, as well as the CO(2)/CH(4) mixed gas selectivity of the resultant membrane. As CO(2) concentration was raised from 14.5 vol % to 70 vol %, a trade-off between permeance and selectivity was found, as CO(2) permeance increased by 136% and CO(2)/CH(4) selectivity reduced by 42.17%. The membrane produced in this work exhibited pressure durability up to 9 bar and adequate gas separation performance at feed gas conditions consisting of high CO(2) content.