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US 4,421,662 AGranted
Nonaqueous purification of mixed nitrate heat transfer media
AssigneeOlin Corporation
InventorsLouis C. Fiorucci, Michael J. Morgan
Life of this patent
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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.
Claims18
A method for removing carbonate and hydroxyl ion impurities from a molten salt mixture of potassium nitrate and sodium nitrate which comprises:
- dissolving a sufficient amount of an anhydrous nitrate salt of an alkali metal or alkaline earth metal in said molten salt capable of forming carbonate and hydroxide compounds which are essentially insoluble therein;
- and
- separating said insoluble compounds from said molten salt whereby said impurities are removed.
Dependencies are inferred from the claim text.