Method of dewatering material containing solid matter and bound and unbound water
US4056466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1973 |
| Grant date | Nov 1, 1977 |
| Priority date | — |
| Expiry date | Aug 3, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B5/005
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A sludge, or other material containing solid matter and bound and unbound water, is dewatered by admixing the sludge with an amine having an inverse critical solution point with water, always maintaining the temperature of the resulting slurry below the inverse critical solution temperature, and thereafter separating the solid matter from the resulting single phase liquid.The single phase liquid is then heated to a temperature above the inverse critical solution point to form an amine phase and a water phase, after which the water phase is separated from the amine phase. The liquid-solid separation rate is significantly increased by preventing the slurry temperature from rising above the inverse critical solution temperature during mixing and separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.