Stabilized hypochlorous acid and hypochlorite solutions
AssigneeImperial Chemical Industries PLC
InventorPhilip Hugh Gamlen
Life of this patent
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Abstract
An aqueous hypochlorite solution containing a stabilizing amount of periodate ions, preferably an amount in the range 0.05 to 1000 parts per million (ppm) by weight based on the volume of the solution, the solution optionally containing silicate ions.
Claims8
In an aqueous solution containing a hypochlorite selected from the group consisting of alkali metal hypochlorite, alkaline earth metal hypochlorite, and hypochlorous acid, and, as impurity, a metal compound selected from the group consisting of nickel, iron and copper compounds or mixtures of such compounds, the improvement wherein the solution also contains a stabilizing amount of periodate ions.
A stabilized aqueous hypochlorite solution consisting essentially of a hypochlorite selected from the group consisting of alkali metal hypochlorites, alkaline earth metal hypochlorites, and hypochlorous acid, a trace amount of at least one metal compound selected from the group consisting of nickel, iron and copper compounds which normally tend to catalyze decomposition of the hypochlorite and a stabilizing amount of periodate ion present in amount sufficient to reduce the rate of decomposition of the hypochlorite by said metal compound.
Dependencies are inferred from the claim text.