| abstract |
(57) [Summary] [Problem] An eighth compound having an organic phosphite compound as a ligand In a hydroformylation reaction using a group noble metal complex as a catalyst, a group VIII noble metal and / or an organic phosphite compound is recovered from the catalyst solution extracted from the reaction system while maintaining catalytic activity. SOLUTION: An organic solvent such as methanol or an organic solvent and water are mixed with a catalyst solution, and a Group VIII noble metal complex and / or an organic phosphite compound are crystallized from the mixture, and the crystallized product is filtered. to recover. |