Multistage countercurrent recrystallization process and apparatus for performing same
US5505924A · kind A · utility
3Cited by
15References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 25, 1993 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | May 25, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D9/004
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is maintained within each recrystallization unit to make use of convection to facilitate or accelerate concurrent dissolution and recrystallization within a single vessel. Solid recrystallized material is moved from one unit to the next unit. An automated apparatus and a manually operated apparatus for carrying out the process are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.