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Propane/Propylene Separation by Simulated Moving Bed II. Measurement and Prediction of Binary Adsorption Equilibria of Propane, Propylene, Isobutane, and 1-Butene on 13X Zeolite

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The design of a simulated moving bed (SMB) process relies on valid thermodynamic predictions of multicomponent adsorption built up from accurate binary adsorption equilibrium data. Experimental adsorption equilibria of binary mixtures constituted by propane, propylene, isobutane and 1-butene on 13X zeolite were determined using breakthrough experiments at 373 K and 150 kPa. In addition, these binary adsorption experiments allow to confirm the choice of isobutane as an interesting desorbent for the separation of propane-propylene by SMB, since it has an intermediate selectivity between the two species to separate. Various prediction models are available in the literature but only a few of them have both physical and thermodynamical consistency. The ideal adsorbed solution theory (IAST), the thermodynamically consistent extended Toth model (TCET), and the physically-consistent extended Toth isotherm (PCET) were used to predict binary adsorption equilibria from pure component adsorption isotherms parameters. The PCET model was found suitable for representing the adsorption equilibrium of the different hydrocarbon mixtures with a reasonably good accuracy.

Keywords: 1-butene; 13X zeolite; IAST; SMB; binary adsorption equilibrium; breakthrough experiment; extended Toth model; isobutane; olefin; propane; propene; propylene; separation; simulated moving bed

Document Type: Research Article


Affiliations: 1: Laboratory of Separation and Reaction Engineering, Associate Laboratory LSRE/LCM, Porto, Portugal,Faculty of Engineering, University of Porto, Porto, Portugal 2: Institut Francais du Petrole, IFP-Lyon, Process Design and Modeling Division, Rond Point de l'echangeur de Solaize, Solaize, France

Publication date: May 1, 2009

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