Catalyst reactivation kinetics for methanol transformation into hydrocarbons. Expressions for designing reaction-regeneration cycles in isothermal and adiabatic fixed bed reactor

Different expressions have been determined experimentally for reactivation kinetics of a catalyst based on a HZSM-5 zeolite, which is used in the tran sformation of methanol into hydrocarbons in a fixed bed reactor operating u nder reaction-re generation cycles. When operation is carried out in isothe rmal regime, the design of the process is carried out by using a relationsh ip of recovered activity to coke combustion time. This relationship is used in the design together with the kinetic models of the main reaction and of the deactivation by coke, in which the effect of attenuation by water in t he reaction medium is taken into account. In order to design the cyclic ope ration in adiabatic regime. a relationship of recovered activity to coke co ntent is used. This reactivation kinetics is different to the activity-coke content relationship corresponding to the reaction stage. (C) 2001 Elsevie r Science Ltd. All rights reserved.