From experimental results obtained in a wide range of
operating conditions (temperature and
contact time) in an isothermal fixed-bed integral reactor, the
usefulness of the model of Schipper
and Krambeck (Chem. Eng. Sci.
1986, 41, 1013−1019) for simulating the
operation has been
proven in the 300−375 °C range. The validity of a deactivation
kinetic model dependent on the
composition of the three lumps for the MTG process (oxygenates, light
olefins, and the rest of
the products) has been proven, for a wide interval of compositions of
the lumps. These
compositions correspond to different states of catalyst deactivation.
The use of this model in
the simulation of the integral reactor avoids noticeable errors
inherent to the nonconsideration
of the effect of composition on the deactivation.
The recovery of the acidic structure and activity during the regeneration step by coke combustion of an HZSM-5 zeolite-based catalyst used in the methanol-to-gasoline (MTG) process in reaction -regeneration cycles was studied. The reactivation kinetics (activity us. coke combustion time) was determined as a function of temperature and time on stream of the reaction step. The validity of the reactivation kinetic model was proven by using it for the simulation of the cyclic operation under conditions of catalyst partial reactivation, together with the kinetic model for the MTG process.
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