| 摘要 |
PURPOSE:To prepare the titled compound under low pressure, in high yield, without causing the lowering of the catalytic activity, by carrying out the reaction of methyl acetate with carbon monoxide and hydrogen in vapor phase in the presence of an iodine compound using a catalyst comprising metallic rhodium and metallic palladium supported on a carrier. CONSTITUTION:Acetaldehyde is prepared by reacting methyl acetate with carbon monoxide and hydrogen in vapor phase in the presence of an iodine compound using a catalyst comprising metallic rhodium and metallic palladium supported on a carrier, preferably active carbon. The amount of metallic rhodium and metallic palladium is 0.01-5wt% preferably 0.1-2wt% each, based on the carrier, and the atomic ratio of metallic rhodium to palladium is preferably 0.001- 10, especially 0.1-1. The iodine compound is e.g. methyl iodide. The molar ratio of methyl acetate to H2 and CO is preferably kept within the range of 0.01-2. |
