Patent ID: 7005542
Filing Date: 2006-02-28
Classification: B01J,C07C

Abstract:
1. A process for preparing an unsaturated aldehyde and/or an unsaturated carboxylic acid, which comprises the step of carrying out catalytic gas phase oxidation, with a catalyst, of at least one compound selected from the group consisting of propylene, isobutylene, t-butyl alcohol, and methyl t-butyl ether as a raw material, with molecular oxygen or a molecular-oxygen-containing gas, thereby producing the unsaturated aldehyde and/or the unsaturated carboxylic acid which corresponds to the raw material; with said catalyst being produced by a preliminary production process which comprises the steps of: carrying out heat treatment of an aqueous solution or slurry of a starting material to thus prepare a catalyst precursor P with the preliminary production process involving the step of controlling an ignition loss ratio of the catalyst precursor P