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Multicomponent sorption of hexane isomers in zeolite BETA
Author(s) -
Bárcia Patrick S.,
Silva José A. C.,
Rodrigues Alírio E.
Publication year - 2007
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.11233
Subject(s) - zeolite , hexane , adsorption , sorption , ternary operation , chemistry , selectivity , langmuir adsorption model , thermodynamics , analytical chemistry (journal) , chromatography , organic chemistry , catalysis , physics , computer science , programming language
Breakthrough curves of single, binary, ternary, and quaternary mixtures of hexane (C 6 ) isomers n ‐hexane ( n HEX), 3‐methylpentane (3MP), 2,3‐dimethylbutane (23DMB), and 2,2‐dimethylbutane (22DMB) were performed in commercial pellets of zeolite BETA (BEA structure), covering the temperature range between 423 and 523 K and partial pressures up to 30 kPa. From these data, single and multicomponent adsorption equilibrium isotherms were collected. A tri‐site Langmuir model (TSL) was developed to interpret the equilibrium data based on considerations about zeolite structure, and a dynamic adsorption model was tested predicting with a good accuracy the behavior of multicomponent fixed‐bed experiments. At the partial pressures studied, the sorption hierarchy in the zeolite BETA is n HEX >>> 3MP > 23DMB >> 22DMB. BEA structure demonstrates a significant selectivity between C 6 isomers, especially at low coverage, giving a good perspective regarding their separation by adsorption processes. © 2007 American Institute of Chemical Engineers AIChE J, 2007