Process for recovering catalyst systems from raw hydroformylation products

Abstract From the Canadian patent

Complexes of transition metals with organic ligands are recovered from raw reaction products containing the complexes, and in particular such complexes of rhodium with tertiary phosphines are recovered from raw hydroformylation products. The raw hydroformylation product ??r if such product is subjected to distillation, the tails of the distillation) are treated with an aqueous solution containing : a) an aldehyde having from 1 to 4 carbon atoms in a molar ratio of from 1:1 to 1:3 with respect to the phosphine and b) a strong acid selected from the group consisting of hydrochloric sulphuric, and perchloric acids, in a molar ratio of from 1:1 to 1:3 with respect to the phosphine, the global …