Process for extracting and disposing of nitrophenolic by-products
US4925565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Sep 12, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/909
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for treating nitrophenolic by-products contained in nitration waste water including the steps of solvent extraction, solvent and nitrophenolic residue recovery by distillation, and incineration of the nitrophenolic residue is disclosed. The extraction process involves the extraction of the nitrophenolic by-products from the nitration waste water utilizing a solvent in the presence of an acid at an elevated temperature and acidic pH. The extraction produces a nitrophenolic solvent solution which is subjected to a distillation to recover the solvent for reuse and produce a residue containing the nitrophenolic materials. The residue can be disposed of by incineration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.