Environmentally acceptable waste disposal by hydrothermal decomposition of labile compounds with nitrite
US5709800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62D2203/10
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for the disposal of waste or the conversion of hydrothermally labile chemical groups and compounds to species which are environmentally acceptable, or are amendable to further degradation by conventional disposal systems to produce environmentally acceptable products, which process comprises: PA1 (a) conveying an aqueous solution or slurry of the waste material into a reaction zone capable of withstanding the temperatures and pressures of hydrothermal decomposition; PA1 (b) reacting the waste material in the reaction zone with an aqueous composition comprising catalyst selected from silica or one or more alkali metal silicates, borates, phosphates, biphosphates, or trisubstituted-phosphates, or comprising as promoting reagent independently selected from one or more alkali metal nitrites, alkaline earth metal nitrites or combinations thereof at between 200.degree. C. and 500.degree. C. and at a pressure between 10 and 400 atmospheres for between about 0.01 and 10 minutes; PA1 (c) producing compounds which are environmentally acceptable or are amenable to further degradation by conventional disposal systems; and PA1 (d) optionally degrading …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.