BCDMH

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Template:Chembox header | BCDMH
BCDMH
Template:Chembox header | General
Systematic name 1-Bromo-3-Chloro-5,5-Dimethylhydantoin
Other names bromochloro-5,5-dimethylhydantoin, BCDMH, agribrom, aquabrom, aquabrome, bromicide, di-halo, halogene T30, nylate, photobrome, slimicide 78P
Molecular formula C5H6BrClN2O2
Molar mass 241.49 g/mol
Appearance White solid
CAS number [126-06-7]
Template:Chembox header | Properties
Density 1.9 g/cm3
Solubility in water 0.25 g/100 ml (25 °C)
Melting point 158 °C - 165 °C
Boiling point n/a
Template:Chembox header | Hazards
MSDS External MSDS
Main hazards Flamability, Inhalation
NFPA 704 Template:NFPA 704
Flash point Decomposes at 160°C
R/S statement Template:S8, Template:S17, Template:S26, Template:S36, Template:S37, Template:S39, Template:S41, Template:S45

BCDMH is a chemical disinfectant used for recreational water and drinking water purification. It is a white crystalline compound with a slight bromine and acetone odor and is insoluble in water, but soluble in acetone. BCDMH is an excellent source of both chlorine and bromine as it reacts slowly with water releasing hypochlorous acid and hypobromous acid. Chemically, BCDMH works in the following manner:

The initial BCDMH reacts with water (R = Dimethylhydantoin):
BrClR + 2 H2O HOBr + HOCl + RH2
BCDMH Water Hypobromous acid Hypochlorous acid Dimethylhydantoin
Hypobromous acid partially dissociates in water:
HOBr H+ + OBr-
Hypobromous acid Hydrogen ion Hypobromite ion
Hypobromous acid produces bromide ions when disinfecting:
HOBr + Live pathogens Br- + Dead pathogens
Hypobromous Acid Bromide Ion
The bromide ions react with the hypochlorous acid that was formed from the initial BCDMH:
Br- + HOCl HOBr + Cl-
Bromide ion Hypochlorous acid Hypobromous acid Chloride ion

This produces more hypobromous acid. However, it should be noted that the hypochlorous acid itself does play in a direct role in the disinfectant process.

References


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