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Multicomponent sorption of hexane isomers in zeolite BETA

Authors

  • Patrick S. Bárcia,

    1. Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Bragança, Apartado 1134, 5301-857 Bragança, Portugal
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  • José A. C. Silva,

    1. Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Bragança, Apartado 1134, 5301-857 Bragança, Portugal
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  • Alírio E. Rodrigues

    Corresponding author
    1. Faculdade de Engenharia, Departamento de Engenharia Química, Laboratory of Separation and Reaction Engineering, Universidade do Porto, Rua do Dr. Roberto Frias, S/N, 4200-465 Porto, Portugal
    • Faculdade de Engenharia, Departamento de Engenharia Química, Laboratory of Separation and Reaction Engineering, Universidade do Porto, Rua do Dr. Roberto Frias, S/N, 4200-465 Porto, Portugal
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Abstract

Breakthrough curves of single, binary, ternary, and quaternary mixtures of hexane (C6) isomers n-hexane (nHEX), 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 nHEX >>> 3MP > 23DMB >> 22DMB. BEA structure demonstrates a significant selectivity between C6 isomers, especially at low coverage, giving a good perspective regarding their separation by adsorption processes. © 2007 American Institute of Chemical Engineers AIChE J, 2007

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