Process for recovery of rhodium values
US4364907A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 1982 |
| Grant date | Dec 21, 1982 |
| Priority date | — |
| Expiry date | May 24, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a process for the recovery of residual rhodium from tar obtained by submitting a rhodium-containing catalyst-tar solution to an extraction using methyl iodide and aqueous hydrogen iodide, thereby recovering catalyst values in the aqueous phase and tar containing residual rhodium in the methyl iodide phase. The residual rhodium-containing tar is submitted to an extraction using a water-immiscible, inert solvent for the tar and aqueous ammonia to obtain residual rhodium in the aqueous phase. The catalyst-tar solution employed is derived from a production system in which acetic anhydride is prepared by carbonylating methyl acetate in the presence of rhodium, lithium and methyl iodide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.