Process of using improved silica-based chromatographic supports containing additives
US4648975A · kind A · utility
41Cited by
23References
3Claims
0Family size
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Key dates
| Filing date | Feb 27, 1986 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Feb 27, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2220/58
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Silica-based chromatographic and reactive materials are disclosed with surfaces modified to contain or to be coated with oxides, hydrous oxides, hydroxides, carbonates or silicates of aluminum, iron, or other suitable metals such as zirconium or titanium. The materials exhibit good resistance to dissolution and resulting loss of activity or clogging. This good resistance is particularly evident even in the high pH region (above 8-9) and in the high temperature region (above 35.degree. C.) where the dissolution rates and solubilities of aluminosilicates and of trivalent iron oxides are much smaller than those of silica.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.