DCDMH
1,3-Dichloro-5,5-dimethylhydantoin
CAS: 118-52-5
Molecular Formula: C5H6Cl2N2O2
DCDMH - Names and Identifiers
| Name | 1,3-Dichloro-5,5-dimethylhydantoin |
| Synonyms | DCDMH DACTIN DANTOIN DICHLORO-DIMETHYL-HYDANTOINE 1,3-dichloro-5,5'-methylhydantoin 1,3-Dichloro-5,5-dimethylhydantoin 1,3-Dicholo-5,5-Dimethyl hydantoin 1,3-DICHLORO-5,5-DIMETHYLHYDANTOIN 1,3-DICHLORO-5,5-DIMETHYLHYDANTOINE 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione 1,3-DICHLORO-5,5-DIMETHYL-2,4-IMIDAZOLIDINEDIONE |
| CAS | 118-52-5 |
| EINECS | 204-258-7 |
| InChI | InChI=1/C5H6Cl2N2O2/c1-5(2)3(10)8(6)4(11)9(5)7/h1-2H3 |
| InChIKey | KEQGZUUPPQEDPF-UHFFFAOYSA-N |
DCDMH - Physico-chemical Properties
| Molecular Formula | C5H6Cl2N2O2 |
| Molar Mass | 197.02 |
| Density | 1,5 g/cm3 |
| Melting Point | 132-134 °C (lit.) |
| Boling Point | 214.7±23.0 °C(Predicted) |
| Flash Point | 171 °C |
| Water Solubility | 0.21 g/100 mL (25 ºC) |
| Solubility | water: soluble0.21% at 25°C(lit.) |
| Vapor Presure | 0.003Pa |
| Appearance | Powder |
| Color | White |
| Exposure Limit | NIOSH REL: TWA 0.2, STEL 0.4, IDLH 5; OSHA PEL: TWA 0.2,STEL/C 0.4 (adopted). |
| Merck | 14,3065 |
| BRN | 146013 |
| pKa | -3.44±0.40(Predicted) |
| PH | 4.4 (H2O)(HSDB) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Stability | Stable, but a strong oxidizer - contact with combustible material may lead to fire. Incompatible with reducing agents, acids, strong bases. Moisture sensitive. |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.5720 (estimate) |
| MDL | MFCD00003190 |
| Physical and Chemical Properties | Melting Point: 131 - 136 |
| Use | Mainly as a bactericidal, algicide, can effectively kill all kinds of bacteria, fungi, Virus, algae, hepatitis Virus |
DCDMH - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R34 - Causes burns R8 - Contact with combustible material may cause fire R50 - Very Toxic to aquatic organisms R43 - May cause sensitization by skin contact R31 - Contact with acids liberates toxic gas R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S17 - Keep away from combustible material. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 1479 5.1/PG 2 |
| WGK Germany | 3 |
| RTECS | MU0700000 |
| TSCA | Yes |
| HS Code | 29332100 |
| Hazard Class | 5.1 |
| Packing Group | II |
| Toxicity | LD50 oral in rabbit: 1520mg/kg |
DCDMH - Upstream Downstream Industry
| Raw Materials | Sodium hypochlorite Hydrochloric acid |
DCDMH - Nature
Open Data Verified Data
white crystalline powder. Melting point of about 130 °c, 100 °c sublimation. The relative density was 1.5. Decomposition in strong acid, strong alkali, partial decomposition in water, chlorine gas. The pH of the aqueous solution was 4.4. Soluble in chloroform, ethanol, benzene.
Last Update：2025-06-10 22:55:16
DCDMH - Preparation Method
Open Data Verified Data
with 5,5-= methyl hydantoin as raw material, dissolved in 10% Na2 C03 solution, passing chlorine gas to neutral 'white crystals, the crystals were filtered and obtained by drying.
Last Update：2022-01-01 10:36:41
DCDMH - Application
Open Data Verified Data
organic intermediates.
Last Update：2025-08-19 16:24:40
DCDMH - Safety
Open Data Verified Data
This product is packed in plastic bags, woven bags or plastic barrels. Store in a cool, dry, ventilated place, sunscreen, moisture-proof, storage and transportation in accordance with the provisions of general chemicals.
Last Update：2025-06-10 22:55:16
DCDMH - Reference Information
| sublimation point | 100°C |
| LogP | -0.94 |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | dichlorodimethylhydantoin, also known as 1,3-dichloro-5,5-dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, DCDMH, etc., English names 1,3-Dichloro-5, 5-dimethylydoin, 1,3-dichloro-5, 5-dimethyloro-5, 5-dimethylythyl-2, 4-imid,, white four-sided prism crystalline powder (industrial products have various specifications such as granular and flake), with slight chlorine pungent smell, easy to absorb moisture, and partial hydrolysis after absorbing moisture. Soluble in chloroform, dichloromethane, carbon tetrachloride, dichloroethylene, symmetric tetrachloroethane, benzene and other organic solvents and concentrated sulfuric acid. It turns brown when heated to the boiling point and burns quickly. |
| application | dichlorodimethylhyde is a new type of chlorinated imide disinfectant and bleaching agent, mainly used as water treatment agent, disinfectant, fruit preservative, etc. It has the characteristics of high efficiency, broad spectrum, safety and stability, and can strongly kill fungi, bacteria, viruses and algae. Widely used in swimming pool disinfection, drinking water disinfection, aquaculture, wastewater and industrial circulating water treatment, tableware disinfection, food and cosmetics production equipment disinfection, medical and health and entertainment environmental disinfection and other fields. |
| preparation | step 1:5, 5-dimethylhydine synthesis. 1) add 46 ml(0.5 mol) of acetone cyanohydrin and 30 ml of water to the reaction bottle of ammonium bicarbonate heating synthesis method, heat, stir, add 80g(0.7 mol) of ammonium bicarbonate in 20 min, then control the temperature in stages, react for 2 h, pour the reaction liquid into a beaker while hot, cool and filter to obtain 44.8g of white solid product with a yield of 70%, m.p.180.4182.8 ℃, the filtrate is concentrated and treated to obtain yellow solid. After recrystallization, filtration and drying, 9.8g of light yellow solid is obtained with a yield of 15%, m.p.180182 ℃ and a total yield of 85%. Or the above-mentioned filtrate without concentration treatment, directly as the solution of the next reaction, the operation steps are the same as above, so the reaction cycle is reused five times, the single yield is 82% 95%. Step 2:5, 5-dimethylhymos product purification. Place a beaker filled with 20 ml of distilled water in a water bath at 80 ℃ for constant temperature, add the crude product until it is close to saturation (about 22.07g), then cool and recrystallize in an ice bath, and dry to obtain 20.14g of colorless needle-like or white powder product with a recovery rate of 91.3%. This filtrate can be recycled. Step 3: Synthesis of 1,3-Dichloro -5,5-Dimethylhydraine Add 8.25g(0.206 mol) of sodium hydroxide and 5 ml of water into a 250 ml three-neck bottle equipped with mechanical stirring:, reflux condenser tube and dropping funnel, stir and dissolve, cool to 010 ℃, slowly introduce 2.24 l (about 0.10 mol) of chlorine gas, and add 12.8g(0.10 mol)5 after completion, 5-dimethylhydene solid, after stirring for 5 min, slowly introduce chlorine 2.46 l (about 0.11 mol) to keep, continue stirring for 20 min after completion, cool and filter, wash the crude product three times with 100 ml of water, drain, vacuum dry below 50 ℃ to obtain light yellow solid or white solid 18.0g, yield 91%. |
| use | mainly as a bactericidal and algicide, it can effectively kill various bacteria, fungi, viruses, algae, hepatitis viruses, etc a chloramine type broad-spectrum high-efficiency disinfectant |
| category | oxidant |
| toxicity classification | poisoning |
| acute toxicity | oral-rat LD50: 542 mg/kg |
| stimulation data | skin-rabbit 500 mg/24 hours severe |
| flammability hazard characteristics | combustion-supporting; fire site releases toxic chloride, nitrogen oxide smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; Separate storage and transportation from food, alkali and oxidant |
| fire extinguishing agent | carbon dioxide, chemical dry powder, foam |
| occupational standard | TWA 0.2 mg/m3; STEL 0.6 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-threatening and health concentration | 5 mg/m3 |
Last Update：2024-04-09 02:00:06
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Raw Materials for DCDMH