Process for recovering triarylphosphine from poisoned rhodium catalyst systems
US4503255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Apr 29, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for recovering re-usable triarylphosphine (e.g. triphenylphosphine) from rhodium catalyst residues poisoned by the presence of alkyldiarylphosphine (e.g. n-propyldiphenylphosphine) such as are obtained as spent catalyst residues from the hydroformylation of olefins. The process comprises subjecting the poisoned residues to evaporative separation under reduced pressure to separate a vapor comprising triarylphosphine from the rhodium and then mixing the condensed vapor with polar solvent and obtaining the triarylphosphine as a crystalline precipitate from the solvent. The crystalline phosphine is sufficiently free of poisons to be re-usable as a catalyst component in a hydroformylation process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.