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Mass transfer effects on kinetics of nonideal liquid phase ethyl tert-butyl ether formation

✍ Scribed by Dr.-Ing. Kai Sundmacher; Prof. Dr. Rui-Sheng Zhang; Prof. Dr.-Ing. Ulrich Hoffmann

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
664 KB
Volume
18
Category
Article
ISSN
0930-7516

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✦ Synopsis

Abstract

Ethyl tert‐butyl ether (ETBE) is an alternative fuel oxygenate that can be produced in the liquid phase by addition of ethanol to isobutene catalyzed by sulfonic acid ion exchange resins. A generalized Langmuir‐Hinshelwood rate expression is formulated in terms of the liquid phase activities of the reactants that is quasi‐autocatalytic due to ethanol. This microkinetic model is combined with the generalized Maxwell‐Stefan equations for a detailed investigation of the influence of multicomponent mass transfer limitations inside the macropores of the heterogeneous catalyst. The model is used for revision of experimental rate data for ETBE synthesis in the literature. The analysis reveals that reverse diffusion of isobutene can occur by strong interaction with ethanol and the catalyst effectiveness factor can exceed unity.

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