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Kinetics of non‐isothermal sorption in molecular sieve crystals
Author(s) -
Ruthven Douglas M.,
Lee LapKeung,
Yucel Hayrettin
Publication year - 1980
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690260104
Subject(s) - isothermal process , thermodynamics , sorption , diffusion , mass transfer , heat transfer , molecular sieve , chemistry , kinetics , zeolite , adsorption , thermal diffusivity , materials science , organic chemistry , physics , quantum mechanics , catalysis
Abstract A mathematical model is developed to describe non‐isothermal sorption kinetics and used to interpret experimental uptake curves for CO 2 in 4A zeolite and for CO 2 and in C 5 H 12 in 5A zeolite. The model assumes that the dominant mass transfer resistance is intracrystalline diffusion while the major resistance to heat transfer is the external heat transfer between the adsorbent sample and the surroundings. It gives a good representation of the kinetic behavior over a wide range of conditions. Both the extreme cases of isothermal diffusion and complete heat transfer control are demonstrated experimentally. Intermediate situations, in which the uptake rate is controlled by the combined effects of diffusion and heat transfer, are demonstrated as well. The parameters derived from the model are consistent, reproducible, and agree well with a priori estimates. The model provides a useful theoretical basis for the analysis of rapid sorption processes for which the non‐isothermal approximation is invalid.