| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing an unsaturated aldehyde and an unsaturated carboxylic acid, capable of stably producing the aldehyde and the acid corresponding to a raw material olefin for a long period in a high yield, by catalytically oxidizing the olefin in a gaseous phase with molecular oxygen or a molecular oxygen-containing gas. <P>SOLUTION: This method comprises (A) using two or more kinds of complex oxides comprising Mo, Bi, and Si-based complex oxides and having ratios of Si contents to Mo contents different from each other as catalysts, (B) dividing a reactor in the direction of a tube axis of the reactor and arranging a plurality of reaction zones used for being filled with the catalysts, and (C) filling the plurality of reaction zones with two or more of the catalysts comprising the complex oxides in such a manner that the ratios of the Si contents to the Mo contents in the catalysts are gradually increased in the direction from the inlet of a raw material gas to the outlet of the gas. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
