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US 4,100,098 AGranted
Stabilized solutions of sodium dithionite
AssigneeOlin Corporation
InventorPhillip R. Magan
Life of this patent
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Abstract
Aqueous solutions containing mixtures of sodium dithionite and sodium sulfite having concentrations of greater than 13 percent by weight of Na.sub.2 S.sub.2 O.sub.4 are stabilized by adding potassium hydroxide in an amount which is sufficient to provide a residual of from about 1 to about 12 grams per liter of solution. These solutions can be stored at temperatures of from about 0.degree. to about 15.degree. C. without crystallization taking place.
Claims7
A method of stabilizing aqueous solutions of mixtures of sodium dithionite and sodium sulfite which comprises:
- (a) preparing an aqueous solution containing greater than about 13 percent by weight of of sodium dithionite and at least one percent of sodium sulfite by weight of said sodium dithionite,
- (b) adding potassium hydroxide to said aqueous solution of an amount sufficient to provide a residual of potassium hydroxide in the solutions of from about 1 to about 12 grams per liter,
- (c) maintaining the aqueous solution at a temperature of from about 0.degree. to about 15.degree. C.
Dependencies are inferred from the claim text.