PROCESS FOR THE LONG-TERM OPERATION OF A HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF AN ORGANIC STARTING COMPOUND

摘要

A process for the long-term operation of a heterogeneously catalyzed partial gas phase oxidation of an organic starting compound, in which the reaction gas input mixture is partially oxidized over a fixed catalyst bed which is accommodated in two successive temperature zones A, B whose temperature is changed with increasing operating time such that the initially lower temperature increases and the difference between the two temperatures decreases.