Allied Chemical Corporation

James William Swaine, Jr

Samuel L Bean

Philip F Seeling

Robert Joel Hoffman

William W Low

Robert Joel Hoffmann

Paul R Crawford

There is disclosed a process for storing energy by use of the heat of fusion of hydrated salts which are within a bulk container having heat exchange means. The process prevents stratification and supercooling from occurring during the heat releasing cycles by internally circulating the molten salt within the container and also by preventing the temperature of the salt from rising above that at which complete melting of the salt crystals within the container occurs.

System and process for storing energy

Anhydrous sodium sulfite is made by a process involving introducing substantially anhydrous sodium carbonate concurrently with impurities-containing mother liquor from which sodium metabisulfite crystals have been crystallized and sulfur dioxide-containing gas into a saturated solution of sodium sulfite maintained at pH of between about 6.5 and about 7.6 at temperature above about 35.degree. C. to form a slurry of anhydrous sodium sulfite crystals, and withdrawing the crystals from the slurry. The process is initiated using a concentrated sodium sulfite solution containing less than about 3 ppm of dissolved iron.

Production of sodium sulfite utilizing mother liquor from the sodium

A process for the production of high purity calcium thiosulfate by a metathesis reaction of ammonium thiosulfate and calcium hydroxide or calcium oxide is disclosed. Aqueous solutions of high purity calcium thiosulfate, in concentrations up to about 30% by weight, are prepared by removing substantially all of the co-product ammonia under conditions which minimize the decomposition of the thiosulfate ion. Heating the reaction mixture to a temperature of about the boiling point at atmospheric pressure is used to prepare aqueous solution of about 10% by weight calcium thiosulfate, and lower reaction temperatures are employed to prepare more concentrated aqueous solutions of calcium thiosulfate up to about 30% by weight, which is the saturation point.

Production of high purity calcium thiosulfate

Anhydrous sodium sulfite is made by a process involving introducing substantially anhydrous sodium carbonate concurrently with sulfur dioxide-containing gas into a saturated solution of sodium sulfite maintained at pH of between about 6.5 and about 7.6 at temperature above about 35.degree. C. to form a slurry of anhydrous sodium sulfite crystals, and withdrawing the crystals from the slurry. The process is initiated using a concentrated sodium sulfite solution containing less than about 3 ppm of dissolved iron.

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Manlius, NY, United States of America

James William Swaine, Jr