PROCESS FOR PRODUCING METHACROLEIN AND/OR METHACRYLIC ACID

摘要

[PROBLEMS] To provide a process for producing methacrolein and/or methacrylic acid which can maintain a high yield and effective selectivity over long. [MEANS FOR SOLVING PROBLEMS] The process for producing methacrolein and/or methacrylic acid comprises using t-butanol and/or isobutylene as a raw material, supplying the raw material to a reaction tube packed with an oxidation catalyst so that the reaction tube has two exothermic peaks in the direction of gas flow, and partially oxidizing the raw material in the presence of molecular oxygen. The process is characterized in that when the minimum temperature value between the two exothermic peaks in the oxidation catalyst layer is expressed by Tm and the temperature of a reaction bath is expressed by Tb, then Tm-Tb>15°C.