The objective of this work is to propose a calculational model for the surf
ace-diffusion based Pressure Swing Adsorption. The assumptions inherent in
the model are that the PSA column behaves as a series of stirred cells and
then on the application of Fick's law in each cell the transfer of sorbed s
pecies in a particle is calculated; in the depressurization period the colu
mn pressure is assumed to decrease in a step-wise manner and the intraparti
cle species mass transfer is evaluated for each constant pressure step. The
calculational results for a benzene-activated carbon system show little de
sorption taking place in the depressurization stage.