关键词: Blend , Composite membrane , Coating , CO2 separation , Hollow fiber , Blend, Composite membrane, Coating, CO2 separation, Hollow fiber

Abstract: Poly (N,N-dimethylaminoethyl methacrylate)-poly (ethylene glycol methyl ether methylacrylate) (PDMAEMA-PEGMEMA) and fluoride-containing salts (Cesium fluoride, CsF) were blended and the blend was used as the separation layer material of composite membranes. Hollow fiber composite membranes were fabricated by coating the blend on polysulfone (PSf) hollow fiber substrate. Introduction of fluoride ion improved the membrane’s separation performance. The concentration of coating solution was adjusted to obtain a higher permeance membrane. CO2 permeance of the blend composite membrane which showed best performance was 30.4 GPU, and its CO2/N2, CO2/CH4, CO2/H2 and O2/N2 selectivities were 47.2, 37.6, 1.75 and 4.70, respectively. Potassium fluoride (KF), as a low cost substitute of CsF, was also used to prepare blend composite membrane. The permeation data confirmed its usability. The effect of operating temperature on the permeation properties of the blend composite membrane was also investigated.