| abstract |
A process for preparing aldehydes which comprisesnreacting an olefinic unsaturated compound with hydrogennand carbon monoxide by hydroformylation reaction in thenpresence of a catalyst in a continuous multistage flownreactor, wherein the continuous multistage flow reactorncontains n number (n≧2) of flow reactors, and thenreaction is carried out in the presence of pressurensectional zones satisfying at least one of the followingnpressure conditions (1) to (3), provided that partialnpressures of hydrogen and carbon monoxide in each reactornare illustrated as (P H2 (1),P CO (1)), (P H2 (2),P CO (2)), ...n(P H2 (n),P CO (n)) in order from the upper stream from thenreactor,n P CO (m-1)<P CO (m) P H2 (m-1)<P H2 (m) P CO (m-1)+P H2 (m-1)<P CO (m)+P H2 (m) nin which m is an integer in the range of 2≦m≦n. |