Silica gel
US4279879A · kind A · utility
16Cited by
16References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Oct 1, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silica hydrogel is prepared by electrolysis of an aqueous anolyte solution containing an alkali metal silicate and a salt of a non-siliceous anion, such as sodium nitrate or sodium sulfate, in a cell with a cation permselective membrane separating the anolyte and an aqueous catholyte. The electrolysis is effected in the presence of the salt to deposit silica hydrogel on the anode. The hydrogel can be easily recovered from the anode and dried to produce regular and intermediate density silica xerogels having narrow pore size distributions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.