Isolation and regeneration of rhodium-containing catalysts...

Details Isolation and regeneration of rhodium-containing catalysts... Isolation and regeneration of rhodium-containing catalysts...

B - Operations, Transporting

01

J

252/87

B01J 23/96 (2006.01) B01J 31/40 (2006.01) C07C 45/50 (2006.01)

Patent

CA 1093057

ABSTRACT OF THE DISCLOSURE: The isolation and regeneration of catalysts of type I or II ClRh(CO)(PR3)2 I Hrh(CO)(PR3)3 II, where the R's are identical or different hydrocarbon radicals, to give the catalysts in a pure form, is effected by regenerat- ing aqueous rhodium salt solutions, as obtained on treating distillation residues of hydroformylation mixtures with oxygen- containing mineral acids and peroxides, by a method wherein the aqueous rhodium salt solutions are treated with a cation ex- changer, the latter is then separated from the solution, the absorbed rhodium ions are desorbed with hydrochloric acid, the hexachlororhodate solutions, containing hydrochloric acid, are reacted, in the presence of a water-soluble organic solvent and a tertiary phosphine PR3, with carbon monoxide, or with compounds which eliminate carbon monoxide, at from 0 to 150°C and from 1 to 5 bars, to form the chloro- complexes I which are either separated off or converted to the hydrido-complexes II using under hydrogenating conditions hydrogen or hydride ions, and the resulting complexes II are separated off.

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