DBDMH
| Template:Chembox header | DBDMH | |
|---|---|
| DBDMH | |
| Template:Chembox header | General | |
| Systematic name | 1,3-Dibromo-5,5-dimethylhydantoin |
| Other names | Albrom 100, DBDMH, Dibromantin, Dibromodimethylhydantoin, XtraBrom 111 |
| Molecular formula | C5H6Br2N2O2 |
| Molar mass | 285.93 g/mol |
| Appearance | White solid |
| CAS number | [77-48-5] |
| Template:Chembox header | Properties | |
| Density | 1.36 g/cm3 |
| Solubility in water | 0.1 g/100 ml (20 °C) |
| Melting point | 197 °C - 203 °C |
| Boiling point | n/a |
| Template:Chembox header | Hazards | |
| MSDS | External MSDS |
| Main hazards | Inhalation |
| NFPA 704 | Template:NFPA 704 |
| Flash point | ? |
| R/S statement | ? |
DBDMH is a disinfectant used for drinking water purification, recreational water treatment, as a bleaching agent in pulp and paper mills, and for treating industrial/commercial water cooling systems. It is a white crystalline compound with a slight bromine odor. DBDMH is an excellent source of bromine as it produces no hypochlorous acid as an intermediate to generation of hypobromous acid. Chemically, DBDMH works in the following manner:
Where R = 5,5-Dimethylhydantoin:
- Br2R + 2 H2O → 2 HOBr+ H-R-H
Hypobromous acid partially dissociates in water (pKa = 8.6):
- HOBr Template:Unicode H+ + BrO-
Hypobromous acid produces bromide ions when disinfecting or oxidizing:
- HOBr + Live Pathogens → Br- + Dead Pathogens
The resulting bromide ions can then undergo oxidation to hypobromous acid in the presence of an oxidizer of sufficient strength e.g. ozone, hypochlorous acid, potassium monopersulfate. This process is commonly called "activation" of the bromide ion.
- Br- + HOCl → HOBr + Cl-