Process for the regeneration of used silica gel
US6248683A · kind A · utility
2Cited by
28References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J38/70
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is concerned a process for the regeneration of the spent silica gel used in chromatography and for any other kind of silica. The process comprises 5 main steps, namely: PA0 washing with an extractant of organic compounds and removing volatile organic materials remaining thereafter; PA0 oxidation to oxidize organic compounds remaining and, preferably, bleach the material; PA0 washing with an acid to remove soluble inorganic matter; PA0 heating to dry the material and combust any remaining organic compounds present; and PA0 recovering the regenerated material. Various optional steps can be added to the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.