Preparation Of Carbon Membrane And Gas Separation Mechanism Of Simulation Studies

This paper presented the progress of membrane technology and the latest achievement on the preparation, application, gas separation mechanism of carbon membranes, also described the process of preparation of carbon membranes using tubular coal-based substrates and a new kind of polymeric precursor- poly(phthalazinone ether sulfone ketone)(PPESK).Also, computer simulation on the mechanism of gas separation through carbon membranes is reviewed, including development and choice of simulation methods and grand canonical Monte Carlo method.The process of membrane preparation and some operation details were given in the thesis. Such factors which have effects on gas separation ability of membrane as solution concentration, way to forming film and coating times were investigated and appropriate process route and conditions were ensured according to this. The experiment results showed that only few membranes have molecular sieving effect for existing pinholes which can weaken gas separation greatly in the resulting membrane. However, carbon membranes with effective gas separation ability can be prepared with PPESK precursor and cheap coal-based substrates if methods of preparation would be improved. Some factors such as pressure which probably have effect on gas separation factor and the carbonization mechanism of PPESK membrane were also discussed in the paper.GCMC method was used to simulate gas separation process through carbon membranes. Its basic principle was given in detail in the paper and adsorption and diffusion of five different gases such as HI, Oa, N2, CtLt and COi in membrane pore were analyzed meanwhile. The simulation results indicate that membrane pore size, temperature and pressure have different effects on adsorption and diffusion, so molecular sieve effects should be explained not only according to relation between pore size and gas molecular diameter but also adsorption ability of gases in membrane pores.