Simulation and Optimization of Methanol Transformation into Hydrocarbons in an Isothermal Fixed-Bed Reactor under Reaction−Regeneration Cycles

Abstract

Both simulation and optimization of the transformation of methanol into gasoline and light olefins (intermediate lump in the kinetic scheme) carried out in an isothermal fixed-bed reactor under reaction−regeneration cycles have been studied by using the kinetics of the following: main reaction, catalyst deactivation, and catalyst reactivation. The catalyst is based on a HZSM-5 zeolite. Optimization of lumps of light olefins and gasoline has been carried out by calculating the optimum values of the length of time for reaction and combustion steps. The effects of other operating conditions (temperature and space time) on the optima have been studied. Suitability of the simulation routine has been proven by carrying out cyclic experiments of reaction−regeneration under the optimum conditions calculated and by comparing the experimental results with those predicted by simulation.

Structure–deactivation relationships in zeolites during the methanol–to-hydrocarbons reaction: Complementary assessments of the coke content

“…Among the different existing deactivation models [124,125,166,167], those reported by Janssens` [124] and Janssens et al [125] are of particular relevance for this PhD. Both models consider zeolite deactivation simply as a loss of effective contact time with time-onstream.…”

Joint Transformation of Methanol and n-Butane into Olefins on an HZSM-5 Zeolite Catalyst in Reaction–Regeneration Cycles

“…This result has also been obtained for the operation in reaction−regeneration cycles in the isomerization of cisbutene, 49 and in the MTG process in a fixed bed and in a fluidized bed with catalyst circulation. 50,51 The optimum activity of the partially generated catalyst, a 0 , is slightly lower when the temperature is higher and decreases when the space time is 0.17 g catalyst h/mol CH 2 .…”

Methanol to aromatics: isolated zinc phosphate groups on HZSM-5 zeolite enhance BTX selectivity and catalytic stability

“…Technically speaking, xed bed reactor is not suitable for MTA process due to the deactivation rate. 4,16,79 In the present research, the catalyst was operated in the xed bed reactor for 240 min, then the reaction was terminated to regenerate in situ to simulate the uidized bed reaction for testing the stability of ZnPHZ catalyst. As indicated in Table 3, ZnPHZ catalyst exhibited excellent recoverable performance during as many as 5 cycles of reactionregeneration were carried out.…”