Production and purification of contaminated effluent streams containing ammonium sulfate and ammonia
US5536385A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1995 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Mar 3, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2201/46115
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention, in certain embodiments, teaches a process for treating ammonia or ammonium-sulfate-containing waste effluent from an acrylonitrile, caprolactam or acetonitrile manufacturing facility. In one such process the effluent is fed to a deep well oxidizer, e.g. a water oxidizer vertical tube reactor (super critical or subcritical), to degrade organic contaminants. Certain embodiments of the deep well oxidizer have, according to this invention, an oxygen inlet tube movable by a coil tubing system. The output stream from the vertical tube reactor is, preferably, filtered, and then it is fed to an electrodialysis unit. In one aspect the electrodialysis unit produces an output stream at a pH of about 5 with a concentration of ammonium sulfate at least, preferably, of about 15% by weight, and most preferably between about 20% and about 26% by weight. This output stream may be neutralized and then further treated to remove ammonia and/or ammonium sulfate solids, e.g. by a downstream ammonia stripper, evaporator, and/or crystallizer system or combination thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.