Process for treating wash water from the manufacture of terephthalic acid
US4540493A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1983 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Nov 30, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2101/34
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for treating wash water from the manufacture of terephthalic acid, wherein the wash water includes terephthalic acid, metal catalyst, and organic acid byproducts. The process includes the steps of passing the wash water through a filter medium to remove undissolved terephthalic acid solids, passing the filtered water through a cation exchange resin in hydrogen ion form to remove the metal catalysts, and passing the water through an anion exchange resin to remove dissolved terephthalic acid and dissolved organic acid byproducts. The treated water and certain components removed from the wash water are recovered and reused in the manufacture of additional terephthalic acid. An apparatus in which the process is practiced is also described and, after a quantity of wash water has been treated, the apparatus is regenerated with regenerants that are also recovered and reused in the manufacture of additional terephthalic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.