Method for freeze granulation
US6079215A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Jan 6, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC12N1/04
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
The present invention is a system and method for freeze granulation of a medium such as a biopharmeceutical product. The medium is put into a chamber and mixed using a pair of counter rotating agitators. The agitators have angled blades or paddles on them in order to induce motion in the medium parallel to the axis of the agitator shafts. A set of liquid nitrogen and liquid carbon dioxide nozzles are attached to the chamber. The liquid nitrogen nozzles spray a mist of liquid nitrogen into the medium. The liquid carbon dioxide nozzles spray carbon dioxide snow into the chamber. The liquid nitrogen and the carbon dioxide can be sprayed into the chamber at the same time or alternately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.