Silica-based substrates modified by grafting of polyalkylguanidinium groups, their process of manufacture and their use as catalysts
US5348923A · kind A · utility
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3References
14Claims
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Key dates
| Filing date | Nov 30, 1992 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2231/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Silica-based substrate surface-modified by grafting covalent links of organic polysubstituted guanidinium groups, and preferably polyakylguanidinium groups. These substrates can be obtained by reacting silica with a polyalkylguanidinium anion, the silanol residual groups of silica being optionally treated with hexamethyldisilazane to stabilize the substrates. These substrates can be used as chlorination and esterification catalysts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.