2-STEP ADSORPTION MODELS IN MOLECULAR-SIEVES

Citation
M. Giona et al., 2-STEP ADSORPTION MODELS IN MOLECULAR-SIEVES, Chemical engineering journal and the biochemical engineering journal, 58(1), 1995, pp. 21-32
Citations number
24
Categorie Soggetti
Engineering, Chemical
ISSN journal
09230467
Volume
58
Issue
1
Year of publication
1995
Pages
21 - 32
Database
ISI
SICI code
0923-0467(1995)58:1<21:2AMIM>2.0.ZU;2-A
Abstract
Starting from analysis of the behaviour of peak retention time vs. the adsorption constant and vs. the mass transfer coefficient, we propose a simple macroscopic model describing adsorption in molecular sieves at high Peclet numbers and at low temperatures. The model is based on the hypothesis that adsorption kinetics evolve through the superpositi on of an instantaneous adsorption step and a slower step controlled by mass transfer resistance. A detailed moment analysis is performed by comparing the results of the two-step model with those deriving from c lassical adsorption models (linear driving force model and macropore-m icropore model) and with experimental chromatographic data of H-2-D-2 adsorption on NaCa-Mordenite. The experimental results at low temperat ures validate the proposed model.