METHOD FOR PRODUCING AT LEAST ONE OF UNSATURATED ALDEHYDE AND UNSATURATED CARBOXYLIC ACID, AND CATALYST FOR PRODUCTION OF AT LEAST ONE OF UNSATURATED ALDEHYDE AND UNSATURATED CARBOXYLIC ACID

摘要

Provided is a method for producing at least one of an unsaturated aldehyde and an unsaturated carboxylic acid from an alkene by an oxidation reaction, in which a n-layered catalyst layer (n ≥ 2) is provided in a gas flow direction in a reaction tube, two or more kinds of catalysts having different activities are used; and the catalysts are packed in such a manner that dT ≤ 20°C is satisfied, when a difference between a temperature PTn of an exothermic peak in a n-th layer as counted from a gas inlet and a minimum value mTn-1 of a temperature of a catalyst layer which appears between an exothermic peak in a (n-1)th layer and an exothermic peak in a n-th layer from the gas inlet is represented as dT (= PTn - mTn-1), and the change rate of dT is 2.5 or less at a reaction bath temperature within a range of ±6°C of a reaction bath temperature at which the highest yield is obtained.