Aqueous zinc nitrite solution and method for preparing the same
US6572834B2 · kind B2 · utility
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4Claims
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Key dates
| Filing date | May 15, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Nov 24, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/50
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An aqueous zinc nitrite solution contains as impurities 10 ppm or less of sodium (Na) and 100 ppm or less of sulfate ions (SO4) when the aqueous solution has a concentration of zinc nitrite [Zn(NO2)2] of 10% by weight in terms of NO2. Also, disclosed is a method for preparing an aqueous zinc nitrite solution, including a first step of reacting zinc sulfate with calcium nitrite to form an aqueous zinc nitrite solution and a second step of purifying the aqueous zinc nitrite solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.