Mathematical Simulation Of Reactor For Methnol To Propylene

The fixed-bed reactor of methanol to propylene was studied in this paper. Thermodynamic analysis of the methanol to propylene reaction has been carried out. For each reaction enthalpy and Gibbs free energy at varying temperatures were presented. The results showed that the reactor of MTP was exothermic.Lump kinetic model of five components was established for the system of MTP. All the products were assumed that generating directly from methanol based on the mechanism of Hydrocarbon Pool, and it was the first order reaction. All the alkenes and C5+components were collected as the lump of RH which was produced from the methanol dehydration. So the system contained the lumps of methanol, methane, ethylene, propylene, butane, RH and water.One-dimensional pseudo-homogenous mathematical modol was established for MTP. Three-stage quenching-with-feed-gas type adiabatic fixed-bed reactor was simulated according to the design optimization under the5000t/d methanol feed rate, then the influence of the inlet temperature of the1st catalyst bed and molar flow of methanol was investigated based on the operation optimization. The three stages of the catalytic bed were0.30m,0.50m and1.1m, the quenching gas separation rate were0.262and0.265under the operation conditions which the inlet temperature623.15K, operating pressure0.13MPa, the import molar flow of methanol6.51×106mol/h. Methanol conversion per pass was improved, the temperature difference between before and after the quenching gas was also increased with the rise of the inlet temperature (603.15～643.15K) of the1st catalytic bed. With imported molar flow of methanol (4.51×106～8.51×106mol/h) increases, the temperature of the catalytic bed and propylene production were increased, but methanol conversion per pass was reduced.