Method of lowering the color of effluent which contains aryl azo- or aryl nitro-containing compounds
US4194973A · kind A · utility
9Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Aug 28, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/917
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Effluent which contains aryl azo- and/or aryl nitro-containing compounds is treated to remove the color by contacting the effluent with Fe(II) in the presence of iron at a temperature and for a time sufficient to cause reduction of the aryl azo and aryl nitro groups of the effluent. Effluent containing metallized compounds may be treated in the same manner and then subjected to alkaline neutralization to remove the metal from the effluent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.