Recovery of noble metal values from carbonylation residues
US4434240A · kind A · utility
14Cited by
14References
10Claims
0Family size
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Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Heavy residues produced by noble metal catalyzed carbonylation reactions and containing Group VIII noble metals, particularly rhodium, are treated with reagents to precipitate solids containing substantially all of the noble metal contained in the residues. The solids may be further treated to recover the noble metals or they may be returned directly for reuse in the carbonylation reaction. Suitable reagents include alkali metal hydroxides, alkali metal peroxides, alkali metal borohydrides, and other reducing agents, such as formaldehyde and acidified sodium bisulfite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.