Nonaqueous purification of mixed nitrate heat transfer media
US4421662A · kind A · utility
5Cited by
2References
18Claims
0Family size
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Key dates
| Filing date | Sep 13, 1982 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Sep 13, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K5/063
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A nonaqueous, in-line method for removing carbonate and hydroxide contamination from a molten mixed sodium nitrate/potassium nitrate heat transfer salt. The method comprises dissolving a stoichiometric quantity of anhydrous Ca(NO.sub.3).sub.2 in the melt whereby an insoluble CaCO.sub.3 and Ca(OH).sub.2 precipitate is formed. The precipitate can be removed by settling, filtration or floatation techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.