Interfacially polymerized polyetheramine thin film composite membranes with PDMS inter-layer for CO2 separation

Polyether based thin film composite (TFC) membranes were developed by interfacial polymerization (IP) on polysuylfone (PSf) ultra-filtration membrane with poly (dimethylsiloxane) (PDMS) inter-layer. Polyetheramine (PEA) and Trimesoyl Chloride (TMC) were selected as aqueous monomer and organic monomer, respectively. The thickness of the PDMS inter-layer was 550   nm, while IP separation layer was only 100   nm. The effects of the PDMS inter-layer and the PEA molecular weight on the TFC membrane performance were investigated. The gas permeation results show that the TFC membrane with PDMS inter-layer exhibits higher CO 2 /N 2 selectivity compared to the membranes without PDMS inter-layer. PDMS inter-layer is able to eliminate the defects on the support membrane and diminish the TMC hydrolysis as well. Among the membranes prepared with three different molecular weight PEAs (ED-600, ED-900 and ED-2003), the membrane of ED-900 exhibits the best performance with an impressive CO 2 permeance of 360 GPU and CO 2 /N 2 selectivity of 67.2 for a mixture CO 2 /N 2 (20/80 by volume), while for a mixture of CO 2 /CH 4 (10/90 by volume) it demonstrates CO 2 permeance of 275 GPU and CO 2 /CH 4 selectivity of 31.6.