Influence of slow diffusing species on mixture diffusion of hexane isomers in silicalite: Characterization by a new cyclic method

The feasibility of mono‐ and di‐branched paraffins separation on silicalite was evaluated by performing cyclic breakthrough experiments in liquid phase with mixtures of 2‐methylpentane (2MP), 3‐methylpentane (3MP), 2,3‐dimethylbutane (23DMB), and 2,2‐dimethylbutane (22DMB). For mixtures of the faste...

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Bibliographic Details
Published in:AIChE journal 2012-05, Vol.58 (5), p.1447-1455
Main Authors: Lettat, Kader, Jolimaitre, Elsa, Tayakout, Mélaz, Tondeur, Daniel
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Applied sciences
Chemical and Process Engineering
Chemical engineering
cyclic method
Diffusion
Engineering Sciences
Exact sciences and technology
liquid phase
mixtures
Parameter estimation
Simulation
Thermodynamics
zeolites
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Summary:The feasibility of mono‐ and di‐branched paraffins separation on silicalite was evaluated by performing cyclic breakthrough experiments in liquid phase with mixtures of 2‐methylpentane (2MP), 3‐methylpentane (3MP), 2,3‐dimethylbutane (23DMB), and 2,2‐dimethylbutane (22DMB). For mixtures of the faster diffusing species (2MP, 3MP, and 23DMB), cyclic steady state is obtained from the first cycle. On the other hand, when the slow diffusing species 22DMB is involved, a slow accumulation occurs from cycle to cycle, yielding a change of the breakthrough curves for all the species. Using a diffusion model especially adapted to adsorbent saturation loading, the kinetic and thermodynamic parameters of 22DMB were estimated. Influence of the cycling conditions on the separation performance were finally studied by simulation. © 2011 American Institute of Chemical Engineers AIChE J, 2012
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12679