PROCESSES FOR RECOVERY OF RHODIUM FROM A HYDROFORMYLATION PROCESS

• Main Authors: PHILLIPS, George R, BIGI, Marinus A, MILLER, Glenn A, BRAMMER, Michael A, EISENSCHMID, Thomas C, SINGH, Amarnath
• Format: Patent
• Language: English; French; German
• Published: 14.09.2022
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention generally relates to processes for the recovery of rhodium from a catalyst purge stream from a C6 or higher olefin hydroformylation process. In one embodiment, the process comprises (a) treating a catalyst-containing liquid purge stream from the hydroformylation process, wherein the catalyst comprises a precious metal and an organophosphorous ligand, with an oxidant in the presence of a separate liquid aqueous phase comprising a halide-free acid at a sufficient temperature to effect oxidation of a majority of the contained organophosphorous ligand, wherein the halide-free acid is a C1-C6 organic acid or phosphorous acid; (b) recovering the aqueous phase; (c) contacting the aqueous phase with a separate organic phase by mixing the two phases under a syngas atmosphere, wherein the separate organic phase comprises water-insoluble, hydrolysable organophosphorous ligand and recycled olefin from a hydroformylation process; and (d) separating the organic phase to be recycled back to a hydroformylation process.