Process for the preparation of concentrated solutions of stabilized hypobromites
OwnerTheodor Fishler, David Feldmaninventors
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Abstract
The invention is a process for the preparation of stabilized aqueous solutions of alkali hypobromites, which comprises reacting a concentrated alkali hydroxide aqueous solution with bromine, allowing the mixture to react, adding to the reaction product, which is a non-stabilized solution, an aqueous solution of a sulfamic compound, such as sodium sulfamate, and thus forming stabilized alkali hypobromite solution. This solution can be further stabilized by the addition of a sulfamate solution. The temperatures of all the above stages are comprised between −5 and +10° C.
Claims15
Process for the preparation of stabilized aqueous solutions of hypobromites, comprises the steps of:
- a) contacting a concentrated alkali hydroxide aqueous solution with bromine, in a hydroxide-bromine equivalent ratio from 2:1 to 3:1;
- b) allowing the mixture to react at a temperature from −5 to 110° C.;
- c) adding to the produce of said reaction, which comprises unstabilized alkali hypobromite, an aqueous solution of a sulfamic compound, chosen in the group consisting of sulfamic acid and soluble sulfamic acid salts, sodium sulfamate at a molar ratio of sulfamate to hypobromite from 1:1 to 1.5:1, at a temperature between −5 to 110° C., whereby to form stabilized hypobromite solution.
A stabilized sodium hypobromite solution containing at least 16 wt % of sodium hypobromite, at least 13.0 wt % of sodium bromide, less than 1 wt % of sodium chloride, and from 17 to 21 wt % of sodium sulfamate content, and having an amount of active halogen, expressed as available chlorine, of at least 9%.
A stabilized sodium hypobromite solution containing at least 10 wt % of sodium hypobromite, less than 1 wt % of sodium bromide, less than 7 wt % of sodium chloride, and from 14 to 25 wt % of sodium sulfamate content.
(canceled)
Dependencies are inferred from the claim text.