METHOD FOR STARTING A HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF ACROLEIN INTO ACRYLIC ACID OR OF METHACROLEIN INTO METHACRYLIC ACID

摘要

A process for starting-up a heterogeneously catalyzed partial gas phase oxidation of acrolein to acrylic acid or of methacrolein to methacrylic acid over a fixed catalyst bed disposed in a tube bundle reactor cooled by a heat exchange medium, wherein the temperature of the heat exchange medium is ≥ 290°C and the temperature of that reactor plate surface which faces the reaction gas entry mixture and the temperature of the reaction gas entry mixture itself are ≤ 285°C.