Development Of High-performance Gas Separation Membranes And Hydrogen Separation Performance

In the field of gas separation membrane, inorganic silicon particles were added topolymer matrix to prepare silicon hybrid membrane, which had properties of compositematerials. Silicon based hybrid membrane combined with excellent performance of theorganic and inorganic silicon, break through bottleneck of research and development oftraditional organic or inorganic membranes. After inorganic silicon be added intoorganism, there were increased significantly both in physicochemical properties andseparation performance of gas separation, which lead to improve overall performance ofseparation films. With rapid development of industry and energy consumption, peoplepay attention to separation and recovery of hydrogen. In order to improve H2separationperformance, many researchers introduced metal into organic matrix to prepare metalhybrid films, which had become focus of current research for gas separation.PMDA and ODA as monomer to synthetic PI films. When mass fraction of PAA is16%and imidization temperature is350℃, PI membrane permeation properties and filmperformance were the best. This work selected polyimide as polymer matrix and TEOS assilica source to prepared PI/SiO2membranes, respectively discussed effect of coatingtimes, imidization temperature and silicon doping on the gas permeability of PI/SiO2films. PI/SiO2films were charactered by means of TG/DTG, XRD, SEM, and FT-IR.Silicon doping amount is most appropriate for15%; coating times optimal for2times; themost suitable imidization temperature is350℃. In experiment of hydrogen permeation ratereached0.67×10-8mol m-2s-1Pa-1, separation factor of H2/N2is27.94, separation factor forH2/CO2is5.50, which were far greater than the value of Knudsen diffusion.Experiment introduced nickel into PAA/SiO2to prepared PI/SiO2/Ni hybridmembranes. Hybrid membranes for hydrogen permeation properties reached0.92×10-8mol m-2s-1Pa-1, the separation factor for H2/N2has reached34.28, separation factor ofH2/CO2reached5.83, which is indicated that Ni had contributed to improved separationmembrane for hydrogen, and further promoted study on the separation of hydrogen. Theseparation factor were far greater than the value of Knudsen diffusion.