Method of producing alkoxysilanes and precipitated silicas from biogenic silicas
US8916122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2013 |
| Grant date | Dec 23, 2014 |
| Priority date | — |
| Expiry date | May 8, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/07
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of producing alkoxysilanes and precipitated silicas from biogenic silicas is provided. In a first step, biogenically concentrated silica is mixed with a liquid polyol to obtain a mixture, and then the mixture is heated. In a second step, a base is added to obtain a reaction mixture. In a third step, the reaction mixture is filtered to remove the carbon enriched RHA or other undissolved biogenic silica and recover the solution of alkoxysilane and alcoholate. In a fourth step, alkoxysilane is purified by filtering, distilling, precipitating or extracting from the original reaction solution to precipitate various forms of silica. In a final step, residual base present in alkoxysilane is neutralized to eliminate the residual alkali metal base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.