| 摘要 |
<p>Aldehydes are prepared by hydroformylation of olefinically unsaturated compounds with hydrogen and carbon monoxide in homogeneous phase in the presence of a catalyst system comprising rhodium complex compounds and aromatic phosphines in molar excess. The catalyst system is separated off from the reaction mixture by pressure filtration on a semipermeable membrane of an aromatic polyamide. The hydroformylation is carried out at pH 2.5-4.2 using a molar ratio of phosphine:rhodium of at least 60 and a rhodium concentration of at least 10 ppm weight. The aromatic phosphines are alkylammonium and/or arylammonium salts of sulphonated or carboxylated triarylphosphines of formula (I). In (I): X = sulphonate or carboxylate; a, b and c each = 0 or 1, at least one being 1; n = 1, 2 or 3; and R1 and R2 each = 8-13C alkyl, 6-10C aryl and/or 6-10C cycloalkyl, R1 can also be hydrogen, with R1 and R2 having a total of at least 30C.</p> |
