Method for reducing reactivity of calcium hypochlorite
View Patent ↗Stable compositions of calcium hypochlorite containing selected hydrated inorganic salts having a sufficiently high enthalpy and the ability to provide water release to sufficiently quench reactions and reduce the potential for conflagration.
1. A method for reducing the reactivity of hydrated calcium hypochlorite comprising:
a) selecting at least two different hydrated inorganic salts based on each of the hydrated inorganic salts having an enthalpy, ΔH, of at least 150 calories/gram, and having a phase transition temperature, as defined by the melting point of 19° C. to 200° C.,
b) thereafter adding to the hydrated calcium hypochlorite said at least two different hydrated inorganic salts to form a mixture with the hydrated calcium hypochlorite,
c) whereby said mixture provides water release in an endothermic reaction to sufficiently quench dangerous reactions and reduce potential for a conflagration while providing increased chlorine stability as compared to hydrated calcium hypochlorite blends containing a single hydrated inorganic salt,
wherein said mixture comprises at least 40% by weight hydrated calcium hypochlorite, and at least two of 0.1 to 19% by weight magnesium sulfate heptahydrate, 0.1 to 19% by weight potassium aluminum phosphate dodecahydrate, 0.1 to 19% by weight trisodium phosphate dodecahydrate, 0.1 to 10% by weight sodium tripolyphosphate hexahydrate and 0.1 to 19% by weight sodium tetraborate decahydrate.
2. The method according to claim 1 wherein said mixture comprises 70% hydrated calcium hypochlorite, 14.3% magnesium sulfate heptahydrate, 9% potassium aluminum sulfate dodecahydrate, 4.7% trisodium phosphate dodecahydrate and 2% sodium tripolyphosphate hexahydrate.
3. The method according to claim 1 wherein the calcium hypochlorite contains from 5% to 22% water.
4. The method according to claim 1 wherein said mixture is in granular form.
5. The method according to claim 1 , wherein the hydrated calcium hypochlorite contains at least 55% available chlorine.
6. The method according to claim 1 , wherein the hydrated calcium hypochlorite contains about 5.5% to 10% water.
7. The method according to claim 1 , wherein the hydrated calcium hypochlorite is present in the amount of 40% to 90% by weight.
8. The method according to claim 7 , wherein the hydrated calcium hypochlorite is present in an amount of about 50% to 85% by weight.
9. The method according to claim 8 , wherein the hydrated calcium hypochlorite is present in an amount of about 60% to 80% by weight.