Pressure-swing absorption based cleaning methods and systems
US5881577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1996 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Sep 9, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06F43/00
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The cleaning process according to the present invention includes three main steps including supercritical extraction of soluble contaminants with a solvent composition, subcritical removal of particulate material with agitation, and solvent recovery and recycle. The supercritical extraction of soluble contaminants is performed by pumping a solvent composition into a cleaning vessel containing articles to be cleaned and pressurizing and heating the fluid in the vessel to a supercritical state. Then the subcritical phase is begun to remove particulate material from the articles by reducing the pressure and temperature of the solvent composition in the cleaning vessel to a subcritical state and reforming the liquid/gas interface. Agitation of the articles in the cleaning vessel is provided by recirculation of the solvent composition or by motion of a mechanical device within the cleaning vessel. Due to a density difference between gas and liquid in the subcritical phase, the degree of agitation and resultant particulate removal is maximized. The solvent composition recovery step preferably includes further depressurization of the fluid to separate and remove soluble and insoluble cont…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.