Process for the isolation of aromatic hydroxycarboxylic acids
US6471844B1 · kind B1 · utility
5Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2001 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Apr 6, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Processes are provided for the electrodialysis of a (di)alkali metal salt of an aromatic hydroxycarboxylic acid to produce a free aromatic hydroxycarboxylic acid and the alkali metal hydroxide, in the presence of a selected alkali metal salt. These various embodiments represent efficient and economical methods for recovering the alkali metal hydroxide, as well as the parent organic compound, from these dialkali metal salts. These processes also desirably prevent overvoltage during the electrodialysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.