Calcium hypochlorite compositions
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 hydrated calcium hypochlorite composition having reduced potential for conflagration made by a method comprising:
a) selecting at least two hydrated inorganic salts from the group consisting of:
magnesium sulfate heptahydrate in an amount ranging from 0.1. to 19% by weight,
potassium aluminum sulfate dodecahydrate in an amount ranging from 0.1. to 19% by weight,
trisodium phosphate dodecahydrate in an amount ranging from 0.1. to 19% by weight,
sodium tripolyphosphate hexahydrate in an amount ranging from 0.1. to 10% by weight, and
sodium tetraborate decahydrate in an amount ranging from 0.1. to 19% by weight,
b) thereafter adding said at least two hydrated inorganic salts to at least 40% by weight of hydrated calcium hypochlorite to form a mixture,
c) whereby said mixture provides water release in an endothermic reaction to sufficiently quench dangerous reactions and reduce potential for conflagration while providing increased chlorine stability as compared to hydrated calcium hypochlorite blends containing a single hydrated inorganic salt.
2. The composition 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 composition according to claim 1 wherein the calcium hypochlorite contains from 5% to 22% water.
4. The composition according to claim 1 wherein said mixture is in granular form.
5. The composition according to claim 1 wherein the hydrated calcium hypochlorite contains at least 55% available chlorine.
6. The composition according to claim 1 wherein the hydrated calcium hypochlorite contains about 5.5% to 10% water.
7. The composition according to claim 1 wherein the hydrated calcium hypochlorite is present in the amount of 40% to 90% by weight.
8. The composition according to claim 7 wherein the hydrated calcium hypochlorite is present in an amount of about 50% to 85% by weight.
9. The composition according to claim 8 wherein the hydrated calcium hypochlorite is present in an amount of about 60% to 80% by weight.