Tandem waste stream treatment for the removal of nitroaromatics and nitrophenolics
US5356539A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Mar 19, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/909
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for removing nitroaromatic and nitrophenolic compounds from an alkaline wastewater stream generated in a process for the nitration of aromatic compounds by the mixed acid technique, which comprises PA1 (a) adjusting the pH of the aqueous alkaline waste stream containing nitroaromatic and nitrophenolic compounds to a range from about 2 to 4.5, PA1 (b) contacting the acidic aqueous stream with sufficient hydrogen peroxide and ferrous ion under conditions to effect oxidation of the nitrophenolic compounds, PA1 (c) adjusting the acidic, oxidized aqueous waste stream having a reduced nitrophenolic content to about pH .gtoreq.4, and PA1 (d) contacting the aqueous waste stream with a carbon adsorbent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.