Pressure and vacuum filtration and washing device
US5389244A · kind A · utility
Inventor
Key dates
| Filing date | Jun 21, 1993 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00164
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A pressure and vacuum filtration and washing device adapted for the processing and handling of hazardous materials without releasing hazardous chemical vapors includes a microporous filter medium which is contained within a pressurized filter vessel. A pump and static mixer, interconnected with the filter vessel by suitable piping means, allow circulation and reslurrying of the filter cake until the wash solvent is properly free of contaminants. The device any be operated under an inert atmosphere. A heated nitrogen gas cake drying means may be associated with the filter medium and contained within the filter. Automatic failsafe control valves are strategically disposed in the device, and the piping means, which interconnect the filter medium, the drying means, and the valves, are fabricated from materials compatible with the flow streams, such as teflon and borosilicate glass,. The device is totally enclosed and self contained, insuring complete operator isolation from hazardous chemicals. The device is used in the pilot plant stage of the chemical industry production life cycle. The filter medium may be a sintered glass, woven or non-woven metal, ceramic, or other microporous med…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.