C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168, 252/1.C,
C22B 11/00 (2006.01) B01J 31/40 (2006.01) C07C 45/50 (2006.01) C07F 9/50 (2006.01)
Patent
CA 1051854
ABSTRACT OF THE DISCLOSURE 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 quantity of the reactants being therefore variable from 1 mole of strong acid + 1 mole of aldehyde up to 3 moles of strong acid + 3 moles of aldehyde per mole of phosphine at a temperature of from 60° to 150°C and the solid rhodium complex thus formed is separated by filtration.
218454
Gregorio Guglielmo
Montrasi Giorgio
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