Fabrication of Multi-Layer Composite Membranes with Excellent CO2 Permeability and Selectivity for Gas Separation Process

Abstract

In this study, asymmetric composite membranes consisting of a support layer and a surface layer (selective layer) were prepared. Then, the properties of these membranes were optimized by controlling the composition of the multi-layer of porous membranes. The support membrane used in this study was polyacrylonitrile (PAN) with a uniform pore structure. Silicone-PEG based material was used as the coating material to improve the CO2 separation efficiency. In order to obtain high selectivity of the membranes, a gutter layer was adopted on the support membrane because of the improved affinity between the PEG coating material and support membrane. Finally, the performances of the composite membrane consisting of a gutter layer and high CO2 selective materials were evaluated in their application to carbon capture and storage.