Effect of Feed Rate on SAPO-34 Deactivation in Methanol-to-Hydrocarbons Process in Different Reactor Types

The effect of the weight hourly space velocity of methanol on the deactivation of SAPO-34 silicoaluminophosphate in methanol conversion to hydrocarbons has been investigated, and the nature of coke deposits formed on completely deactivated zeolite samples in the course of operation in different reactors has been examined. The deactivation order with respect to methanol is 1 in fluidized-bed, and slurry reactors, while it is 1.2 in the fixed-bed reactor. The presence of polydimethylsiloxane as the reaction medium in a slurry reactor decreases the time of the stable catalyst operation by a factor of 2 relative to the fluidised-bed reactor irrespective of the feed rate. The specific conditions at which different types of reactors demonstrate a more stable operation in this process have been calculated.