Patent ID: 9440904
Filing Date: 2016-09-13
CPC Classification: B01J,C07C

Claim Text:
1. A method for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid, the method comprising: subjecting an alkene to gas-phase catalytic partial oxidation with molecular oxygen by using a multitubular oxidation reactor having a complex metal oxide catalyst filled therein, thereby producing a corresponding unsaturated aldehyde and/or unsaturated carboxylic acid, wherein when preparing two or more kinds of catalysts having different formulations and stacking two or more layers in an axial direction of a tube, thereby achieving multilayer filling, the catalysts are filled in such a manner that not only a component amount of bismuth relative to molybdenum decreases from a gas inlet side toward a gas outlet side, but also a component amount of iron relative to molybdenum increases from the gas inlet side toward the gas outlet side.