Method for producing unsaturated aldehyde and device for producing unsaturated aldehyde

Abstract

The present invention relates to a method for producing an unsaturated aldehyde corresponding to an alkene including partially oxidizing the alkene using a fixed-bed multitubular reactor. The fixed-bed multitubular reactor includes multiple reaction tubes and a reaction bath for adjusting temperature of the multiple reaction tubes. The reaction tube is provided with two or more catalyst layers in a gas flow direction. When a reaction bath temperature at which a yield of the unsaturated aldehyde is the highest is defined as A (° C.), and reaction bath temperatures at which the yield is 1.0% lower than the highest value are defined as A1 (° C.) and A2 (° C.), following formulae (1) and (2) hold: A1<A<A2 (1); and (A2−A1)≥10 (2).

Dependencies are inferred from the claim text.