ADSORPTION-KINETICS FOR THE CASE OF STEP AND S-SHAPE ISOTHERMS

The kinetics of diffusion in a spherical pellet saturated by a sorbate in the presence of an inert component are considered for the case of a step isotherm. A new convective flux inside the pores due to sorptio n effect has been taken into consideration, and an analytical expressi on for sorption kinetics is obtained. The convective flux may result i n considerable increase in the sorption rate. It is also found that th e formula obtained also glues a satisfactory description of sorption k inetics for the case of an S-shaped isotherm.