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   » » Wiki: Halazone
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Halazone ( 4-(dichlorosulfamoyl)benzoic acid) is a chemical compound whose can be written as either or . It has been widely used to disinfect drinking water.

Other names for this compound include p-sulfondichloramidobenzoic acid, 4-(dichloroamino)sulfonylbenzoic acid, and Pantocide.


Uses
Halazone tablets have been used to disinfect water for drinking, especially where treated tap water is not available. A typical dosage is 4 mg/L.Gripo Laboratories: " Water purification range: Halazone USP based Chlorine Tablets ". Product page, accessed on 2018-06-18Precise Health Care PVT LTD: " Halazone tablets ". Product page, accessed on 2018-06-18

Halazone tablets were commonly used during World War II by U.S. soldiers for portable water purification, even being included in accessory packs for until 1945.

Halazone was widely used by Marine infantry units during the . Halazone has largely been replaced in that use by sodium dichloroisocyanurate. The primary limitation of halazone tablets was the very short usable life of opened bottles, typically three days or less, unlike iodine-based tablets which have a usable open bottle life of three months.

Dilute halazone solutions (4 to 8 ppm of available chlorine) has also been used to disinfect , and as a .


Mechanism of action
Halazone's disinfecting activity is mainly due to the hypochlorous acid () released by of the - bonds when the product is dissolved in water:
+ → +
The hypochlorous acid is a powerful and that destroys or denatures many organic compounds.


Production
Halazone can be prepared by chlorination of p-sulfonamidobenzoic acid.

Another synthesis route is the oxidation of with potassium permanganate in a mild alkaline medium.


See also
  • Chlorine-releasing compound
  • (tosylchloramide sodium salt), another water disinfection agent.
  • Water chlorination

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