Method for removing polychlorinated dibenzodioxins and polychlorinated dibenzofurans from paper mill sludge
US5075017A · kind A · utility
44Cited by
23References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Oct 12, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/928
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for removing PCDD's and PCDF's from paper mill sludge is provided. The process comprises combining the sludge with an oxidant and then oxidizing the sludge under supercritical or near supercritical conditions to destroy the PCDD's and PCDF's. Using this process, destruction efficiencies of greater than 98% have been achieved for 2,3,7,8-TCDD, which is reportedly the most toxic of the dioxins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.