PSA simulation using particle complex models

This study presents several PSA with complex particle models: dusty gas mod el (PSA/DG), linear driving force (LDF) approximation to the DG (PSA/LDF-DG ) and LDF approximation extensions when surface (PSA/LDF-DGSD) or micropore diffusion (PSA/LDF-DGMD) are important. A comparison between the PSA/DG an d PSA/LDF-DG models is shown and discussed in two situations: short and lon g cycles. Also some results in the literature are discussed in the light of these LDF approximations. It was concluded that the PSA/LDF-DG is a good a pproximation to the PSA/DG for long cycles. For short cycles a special algo rithm was developed, where two time scales have to be considered. It was al so concluded that the time delay presented by the LDF-DG has to be consider ed in order to reproduce the PSA/DG results. This can explain the reason wh y some authors found difficulties using the LDF model in PSA simulations. S ome simulation results are shown when the PSA/LDF-DGSD or PSA/LDF-DGMD mode ls are used and compared with equivalent results of the PSA/LDF-DG model. ( C) 2001 Elsevier Science B.V. All rights reserved.