| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing (meth)acrolein or (meth)acrylic acid comprising performing vapor phase catalytic oxidation reaction of an oxidizable substance such as propylene, propane, isobutylene, and (meth)acrolein with a molecular oxygen or a molecular oxygen-containing gas with the use of a multitubular reactor equipped with one or more layers of catalyst layers in the tube axis direction, which method inhibits a rapid rise in temperature to prevent the catalyst from deactivating and performs stable manufacturing even after changing the reaction conditions for raising reaction temperature to increase the production speed. SOLUTION: In this manufacturing method, changing of reaction conditions for increasing the reaction temperature is performed by changing the inlet temperature of a heating medium for regulating the reaction temperature provided in the multitubular reactor and in this instance, (1) changing of the inlet temperature for the heating medium is performed by≤2°C per one changing operation, and furthermore (2) in the case of successively performing the changing operation, the changing operation is performed 10 minutes apart from the immediately prior changing operation. COPYRIGHT: (C)2005,JPO&NCIPI
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