Kinetics of nonisothermal sorption: Systems with bed diffusion control
- 1 July 1981
- journal article
- research article
- Published by Wiley in AIChE Journal
- Vol. 27 (4) , 654-663
- https://doi.org/10.1002/aic.690270418
Abstract
A theoretical model is presented to describe the kinetics of nonisothermal sorption for a system in which the main resistance to mass transfer is the macrodiffusional resistance of the absorbent particle bed while the main resistance to heat transfer is the resistance at the external surface of the adsorbent sample. The model is used to interpret experimental kinetic data for the sorption of several hydrocarbons in 10X and 13X zeolite crystals. By varying the configuration of the sample bed and the size of the zeolite crystals it is shown that, for n‐heptane and iso‐octane in 13X, the intracrystalline diffusional resistance is negligible even in 40‐μm crystals. The assumption of intracrystalline diffusion control which has been made in earlier kinetic studies of similar systems is therefore incorrect.Keywords
This publication has 7 references indexed in Scilit:
- Kinetics of non‐isothermal sorption in molecular sieve crystalsAIChE Journal, 1980
- Analysis of thermal effects in adsorption rate measurementsJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1979
- Selbstdiffusionsverhalten der homologen Reihe der n-Alkane von n-Butan bis n-Oktadekan in NaX-ZeolithenZeitschrift für Physikalische Chemie, 1978
- Intercrystalline molecular transport in zeolites studied by uptake experiments and by nuclear magnetic resonance pulsed field gradient techniquesJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1978
- Diffusion of hydrocarbons in 13X zeoliteAIChE Journal, 1976
- Transient diffusion in solids with a bipore distributionAIChE Journal, 1976
- Gel growth of large crystals of sodium A and sodium X zeolitesJournal of Crystal Growth, 1971