Reaction Kinetics Study of Methanol IDehydration on HZSM-5 Zeolite ——Analysis of Steady State Reaction in a Plug Flow Reactor and in a Continuous Stirred Tank Reactor

Abstract

Abstract: Using the method of continuous flow steady state, we study the kinetics of methanol dehydration to form dimethylether on HZSM-5 zeolite.By means of two reactor--Plug Flow Reactor(PFR) and Continuous Stirred Tank Reactor (CSTR), we obtain the integral and differential kinetic data, respectively.The molecule state adsorption, reversibility of surface reaction and unadsorption of dimethylether are considered.Six mechanism models of this dehydrate reaction are established in connection to Langmuir-Hinshelwood(LH) and Rideal-Eley(RE) mechanisms.The correlative rate equations are given as equations (5)-(7) and (8)-(10).However since equations (7) and (10) are the same, there are only 5 rate equations ought to be dealt with the non-linear regression method.Corresponding to every equation and every reactor, six parameters may be obtained.According to the requirement of all parameters which are positive values, we can come to the conclusion that only model (9) is allowed.That is REmechanism, meanwhile model (3) is the rate determining step.

Key words: Kinetics, Methanol dehydration, Mechanism model

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ZANG Ya-Ru, TAO Ke-Yi, GAO Feng, GUO Yan-Mou, LI He-Xuan . Reaction Kinetics Study of Methanol IDehydration on HZSM-5 Zeolite ——Analysis of Steady State Reaction in a Plug Flow Reactor and in a Continuous Stirred Tank Reactor[J]. Chem. J. Chinese Universities, 1993, 14(2): 252.

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Reaction Kinetics Study of Methanol IDehydration on HZSM-5 Zeolite ——Analysis of Steady State Reaction in a Plug Flow Reactor and in a Continuous Stirred Tank Reactor

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