Membrane separation of catalyst metals from trimellitic acid production and separation of cobalt from manganese
US4311521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1980 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Oct 1, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2311/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Precipitation-free recovery of catalyst metal content of residue from manufacture of trimellitic acid by oxidation with source of molecular oxygen of liquid pseudocumene in presence of cobalt and manganese, cobalt, manganese and cerium, followed by removal of trimellitic acid or its anhydride and, if used, reaction solvent and then separating manganese from the recovered metals. The foregoing is accomplished by extraction of such residue with water, contacting the resulting aqueous extract solution or suspension of insolubles in the aqueous solution with one side of a cation permeable fluoropolymer membrane whose other side is in contact with a hydrohalidic acid to permit metal ions to pass through the membrane, removing the hydrohalidic solution of the catalyst metals, and then after a pH adjustment adding metallic manganese to precipitate cobalt as metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.