Sodium dichloroisocyanurate

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Sodium dichloroisocyanurate
Sodium dichloroisocyanurate structure.svg
CAS number 2893-78-9 YesY
51580-86-0 (dihydrate)
PubChem 517121
ChemSpider 451165 YesY
RTECS number XZ1900000
Jmol-3D images Image 1
Molecular formula C3Cl2N3NaO3
Molar mass 219.95 g/mol (anhydrous)

255.98 g/mol (dihydrate)

Appearance white, crystalline powder
Odor chlorine-like
Density 0.7 g/cm3 (as granules)
Melting point 225 °C (437 °F; 498 K)
Solubility in water 22.7 g/100 mL (25 °C)
Solubility in acetone 0.5 g/100 mL (30 °C)
Acidity (pKa) 6.2-6.8
LD50 (Rat oral) 1670 mg/kg
Related compounds
Other cations Potassium dichloroisocyanurate
Calcium dichloroisocyanurate
Lithium dichloroisocyanurate
Barium dichloroisocyanurate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Sodium dichloroisocyanurate (INN: sodium troclosene, troclosenum natricum or NaDCC or SDIC) is an inorganic compound. It is a colourless, water-soluble solid. It is a widely used cleansing agent and disinfectant.[1] The dihydrate is also known (CAS# 51580-86-0) as is the potassium salt (CAS#2244-21-5).


It is mainly used as a disinfectant, biocide, industrial deodorant and detergent. It is found in some modern water purification tablets/filters. It is more efficient than formerly used halazone water disinfectant. In these applications, it is a source of slow release of chlorine in low concentrations at a relatively constant rate. As a disinfectant, it is used to sterilize drinking water, swimming pools, tableware and air, fight against infectious diseases as routine disinfection.

It can be used as a preventive for disinfection and environmental sterilization, in raising silkworm, livestock, poultry and fish, and also can be used to prevent wool from shrinking, bleaching textiles and cleaning industrial circulating water.

In one notably interesting experiment, a concentrated solution of NaDCC and a dilute solution of copper (II) sulphate are mixed, producing an intense lilac precipitate of the complex salt sodium copper dichloroisocyanurate. The reactions between Dichloroisocyanurate salts (Na, K, Li, Ba, Ca) and transition metal salts (Ni, Cu, Cd) are described in patent US 3'055'889. The overall reaction is:

CuSO4 + 4 Na(C3N3O3Cl2) → Na2[Cu(C3N3O3Cl2)4] + Na2SO4

It is used to show chemiluminescence as it emits red light upon decomposition by concentrated (130 vol, 35%) hydrogen peroxide.

See Also[edit]


  1. ^ Klaus Huthmacher, Dieter Most "Cyanuric Acid and Cyanuric Chloride" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a08_191.