Mathematical modeling of multi-bed adiabatic reactor for the Methanol-to-Olefin process

Abstract

A mathematical model of a multi-bed adiabatic reactor for the Methanol-to-Olefin (MTO) process is established based on a lumping kinetic equation with SAPO-34 catalyst. Influences of different process conditions are investigated. Temperature plays a more important role in governing simulation results than other factors do. The decrease of methanol conversion resulting from catalyst deactivation could be reflected by changing the model parameter.Keywords Methanol-to-olefins Á SAPO-34 catalyst Á Multi-bed adiabatic reactor Á Process condition List of symbols A, BModulus coefficient a, b, c, d, e Modulus coefficient Cor Activity correction factor Cp Specific heat, J mol -1 K -1 D Inner diameter of reactor, m Ea Activation energy, J mol -1 k Reaction rate constant, mol g -1 h -1 kPa -1 lOperational bed height, m N Mole flow rate, mol h -1 N/AThe mole ratio of nitrogen to methanol m Mass flow rate, g h -1 n Mole flow rate, mol h -1

Single-Event Microkinetics for Methanol to Olefins on H-ZSM-5

“…On the other hand, in fundamental, microkinetic models, the reaction mechanism is considered in terms of elementary steps, which describe the reactions taking place at the catalyst surface at a molecular level. The kinetic and catalyst descriptors determined based on such models have a clear physical meaning, which can be exploited in the design of improved and innovative catalysts by relating the catalyst descriptors to the composition and synthesis procedure. , The complexity of the product pattern in the MTO reaction forced many researchers to lump reactants as well as products. − Nevertheless, fundamental kinetic modeling efforts − have also been reported for MTO. Chen et al proposed a kinetic model over ZSM-5 by considering the autocatalytic reaction between the oxygenates and the produced olefins.…”