The mass transfer process of RPSA (rapid pressure swing adsorption) and the effect of varions mass transfer resistances on mass transfer were investigated. The global dynamic mass transfer coefficient was compared with constant mass transfer coefficient. The results show that the dynamic mass transfer coefficients based on axial

membrane diffusion and pore diffusion estimation are effective. Membrane resistance takes up a large part of lumped resistance. Followed by axial diffusion resistance

the macrospores diffusion resistance and the micropores diffusion resistance can be neglected. In the rapid PSA

the mass transfer coefficient will change due to the rapid change of gas velocity and temperature

and the overall trend is that the mass transfer coefficient increases with the increase of temperature and gas velocity. Using the constant mass transfer coefficient cannot accurately describe the mass transfer behavior at each time point and space point in the absorber. The dynamic estimation mass transfer coefficient calculated according to the state of each node can have good coincidence with the behavior in the absorption bed

and the model has high reliability.