Method and apparatus for producing particles using supercritical fluid
US7455797B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2004 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Jan 30, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/0407
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a method of producing particles via a supercritical fluid processing technique, an apparatus for carrying out the method and the particles produced thereby. The method includes: (1) providing: a supercritical fluid; a first solvent that is soluble in the supercritical fluid; a second solvent that is substantially insoluble in the supercritical fluid and is at least partially soluble in or miscible with the first solvent; and a solute that is soluble in the first solvent and is substantially insoluble in the second solvent and the supercritical fluid; (2) contacting the first solvent, the second solvent and the solute together to form a solution; and (3) contacting the solution with the supercritical fluid to extract the first solvent from the solution and precipitate the solute in the form of particles that are suspended in the second solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.