| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing an aldehyde by which the aldehyde can be obtained in high activity and high selectivity by hydroformylating an olefinic unsaturated compound in a homogeneous phase from which the whole catalyst system can be separated. SOLUTION: The objective aldehyde is produced by hydroformylating an olefinic unsaturated compound with H2 and CO in the presence of a catalyst system containing a rhodium complex salt compound and an excess molar amount of an aromatic phosphine of the formula [X is a sulfonate residue, etc.; (a) to (c) are each 0 or 1 with the proviso that at least one of (a) to (c) is 1; (n) is 1, 2 or 3; R<1> and R<2> are each an 8-30C alkyl residue, etc., with the proviso that the total number of C in the R<1> and the R<2> is at least 30] in a homogenous phase and separating the catalyst system from the reaction mixture by using an aromatic polyamide semipermeable membrane and performing pressure filtration. Moreover, the hydroformylation is performed at pH2.5-4.3, by regulating the mol ratio of the phosphine to the rhodium to at least 60 and the rhodium concentration based on the amount of the olefinic unsaturated compound to at least 10wt.ppm.</p> |
