C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168
C22B 7/00 (2006.01) B01J 31/40 (2006.01) C01G 55/00 (2006.01) C07C 45/50 (2006.01) C22B 3/32 (2006.01) C22B 3/38 (2006.01)
Patent
CA 1109274
Title Rhodium Recovery from Hydroformylation Still Heel with Triaryl Phosphite Ligand Abstract A process for recovering rhodium present in a still heel from the hydroformylation of an unsaturated hydrocarbon wherein rhodium and a triaryl phosphite ligand were used characterized by (a) pretreating the still heel with a compatible organic solvent or a mixture there- of, at least 5 ml of water per 100 g of still heel, oxygen gas or a precursor thereof and sufficient base to produce a pH of 2 to 7 in the reaction mixture after rhodium precipita- tion; (b) heating to a temperature of from 0° to 80°C to oxidize the triaryl phosphite ligand to the corresponding phosphate com- pound; and (c) heating the mixture from (b) for from about 15 minutes to about 120 minutes at about 115°C to about 175°C to precipitate zero valent rhodium; and optionally purify- ing the precipitated rhodium from (c) by converting from zero valent form to Rh2O3.
308179
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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