Processes for the preparation of stannic oxide
US9102996B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Dec 22, 2011 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Dec 22, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed herein are processes for oxidising Sn2+ dissolved in an aqueous solution to stannic compounds using NO2 and optionally O2 as oxidants, wherein the aqueous solution is kept at a pH in the range of 0 to 7, wherein a salt Sn2+(Xn−)2/n and the oxidants are used according to the reaction scheme a Sn2+(Xn−)2/n +b O2+c NO2−→stannic compounds in which scheme a, b and c are mole numbers; with the proviso that when b is essentially zero, then the aqueous solution is essentially free of Cl−, HSO4− and SO42−.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.