Processes for recovery of rhodium from a hydroformylation process
US12246310B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2020 |
| Grant date | Mar 11, 2025 |
| Priority date | — |
| Expiry date | Jan 12, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.