Adsorption isotherms of pure gas and binary mixtures of air compounds on faujasite zeolite adsorbents: Effect of compensation cation

Marie L. Zanota, Nicolas Heymans, Frédéric Gilles, Bao L. Su, Marc Frère, Guy De Weireld

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Résumé

To design or simulate air separation by a pressure swing adsorption process (PSA), adsorption equilibrium data in the range of temperatures used in this kind of process are needed. Acquisition of coadsorption equilibrium data is time-consuming, and then a binary model based on pure substance isotherm measurements is usually used to simulate equilibrium in PSA. In this paper, adsorption equilibrium data for nitrogen and oxygen on five faujasite zeolites (NaX, NaLSX, KLSX, and two LiLSX) were obtained at (288, 303, and 318) K and at pressures up to 3000 kPa. Coadsorption equilibria of nitrogen and oxygen mixtures were measured at 400 kPa with an original volumetric apparatus which is able to keep a constant pressure in the measurement cell. The measurements were compared to isotherms calculated by an extended Langmuir-Freundlich model. The influence of compensation cation on the adsorption capacities and selectivities was also analyzed.

langue originaleAnglais
Pages (de - à)448-458
Nombre de pages11
journalJournal of Chemical and Engineering Data
Volume55
Numéro de publication1
Les DOIs
Etat de la publicationPublié - 14 janv. 2010

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