Membrane separation of catalyst metals from aromatic acid production
US4312778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Oct 1, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/32
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Precipitation-free recovery of catalyst metal content of residue from manufacture of benzene carboxylic acid by oxidation with source of molecular oxygen of liquid methyl-substituted benzene in presence of cobalt, manganese, cerium, and mixtures of two or more thereof followed by removal of benzene carboxylic acid and, if used, reaction solvent. Such precipitation-free method comprises extracting such residue with water, contacting the resulting extract solution or suspension of insolubles in extract solution with one side of a cation permeable fluoropolymer membrane and contacting the opposite side of the membrane with a hydrohalidic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.