CONCENTRATION-DEPENDENT KINETIC-MODEL FOR CATALYST DEACTIVATION IN THE MTG PROCESS

From experimental results obtained in a wide range of operating condit ions (temperature and contact time) in an isothermal fixed-bed integra l 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 degrees 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. The se compositions correspond to different states of catalyst deactivatio n. The use of this model in the simulation of the integral reactor avo ids noticeable errors inherent to the nonconsideration of the effect o f composition on the deactivation.