Integrated effluent treatment process for nitroaromatic manufacture
US6288289A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2000 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Jan 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An integrated process for treating alkaline wash water effluent from nitroaromatic manufacture, principally containing nitro-hydroxy-aromatic compounds is described. The integrated process concentrates the alkaline wash water to recover chemicals and water prior to treating the concentrate through supercritical water oxidation. The supercritical water oxidation step consists of treating the concentrate in the presence of an oxygen source at conditions, which are supercritical for water to cause a substantial portion of the organic component of the concentrate to oxidize. The product effluent includes a gaseous component and a clean water component, and in the event that insoluble ash is formed, an ash component. The new integrated process results in reduced chemical and water consumption compared to existing processes. In addition, the treated wash water effluent can be recycled to process or directly discharged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.