The kinetics of methanol to olefins in the fixed-bed isothermal integral reactor was studied. The lumping idea was introduced into the kinetics study

in which the influence of water and coke deposition was taken into consideration.The equations of kinetics on fresh and deactivated catalyst were calculated with the help of the simplex optimization and Runge-Kutta methods.The obtained general kinetics equations could be used to calculate the reaction rates of corresponding lump. Subsequently

the respective reaction rate of ethylene

propylene

butene in any conditions were calculated based on the relation of ratios between olefins (ethylene/propylene and propylene/butene) and reaction temperature.The results showed that the error of statistical test and comparison of calculated values with the experimental values was in the allowable range.