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Nonaqueous-purification-of-mixed-nitrate-heat-transfer-media

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Nonaqueous purification of mixed nitrate heat transfer media

Details

Inventors: Fiorucci, Louis C.; Morgan, Michael J.;
Assignee: Olin Corporation (New Haven, CT)
Primary Examiner: Kittle; John E.
Assistant Examiner: Wax; Robert A.
Attorney, Agent or Firm: Oaks; Arthur E., Clements; Donald F.

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.

DETAILED DESCRIPTION The present invention is a process for removing insoluble hydroxide and carbonate contaminants in a molten mixed sodium nitrate/potassium nitrate heat transfer and thermal storage medium used in a closed loop solar powered electric generating a closed loop solar powered electric generating station.
In the process of the present invention, these contaminants are removed by adding anhydrous calcium nitrate to the molten salt.
While calcium nitrate is soluble in the mass, its oxide, hydroxide and carbonate compounds are essentially insoluble therein and precipitate out.
These can be removed either by settling out, filtration or floatation techniques in suitably designed facilities, without perturbing the normal operation of a closed loop heat generation system.
It is an object of the present invention to provide a method for removing oxide, hydroxide and carbonate impurities from molten sodium nitrate/potassium nitrate heat transfer media.
It is a further object of the present invention to provide a method for removing oxide, hydroxide and carbonate impurities from molten sodium nitrate/potassium nitrate heat transfer media within the confines of a solar power generating station.
These and other objects of the invention will become apparent from the following description and the appended claims.

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