Performance of Multilayer Composite Hollow Membrane in Separation of CO2 from CH4 in Mixed Gas Conditions

Abstract

Composite membranes comprising NH2-MIL-125(Ti)/PEBAX coated on PDMS/PSf were prepared in this work, and their gas separation performance for high CO2 feed gas was investigated under various operating circumstances, such as pressure and CO2 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). CO2 concentration and feed gas pressure were demonstrated to have a considerable impact on the CO2 and CH4 permeance, as well as the CO2/CH4 mixed gas selectivity of the resultant membrane. As CO2 concentration was raised from 14.5 vol % to 70 vol %, a trade-off between permeance and selectivity was found, as CO2 permeance increased by 136% and CO2/CH4 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 CO2 content.

PEBA/Na-X Multilayer Hybrid Membrane for CO2 Separation: Influence of Na-X Zeolite Layer Synthesis Condition

“…One of the promising strategies for improving the separation performance of membranes in the separation of CO 2 is a composite structure of organic-inorganic multilayer hybrid membranes [5,6]. The motivation for fabricating multilayer hybrid membranes is to achieve a high performance membrane at low cost.…”

“…Therefore, some expensive and high performance materials can be used [7]. Several review papers have reported that PEBA (Polyether block amide) polymer as an organic membrane has excellent potential for separating acid gas such as CO 2 , and can be used as a selective top layer in multilayer hybrid membranes [6,[8][9][10]. The multilayer hybrid membrane with high selective top layer must have a suitable sublayer.…”