1,2-Dibroomethaan
1,2-Dibromoethane
CAS: 106-93-4
Molecular Formula: C2H4Br2
1,2-Dibroomethaan - Names and Identifiers
1,2-Dibroomethaan - Physico-chemical Properties
| Molecular Formula | C2H4Br2 |
| Molar Mass | 187.86 |
| Density | 2.18g/mLat 25°C(lit.) |
| Melting Point | 9 °C |
| Boling Point | 131-132°C(lit.) |
| Flash Point | 132°C |
| Water Solubility | 4 g/L (20 ºC) |
| Solubility | water: soluble250 part |
| Vapor Presure | 11.7 mm Hg ( 25 °C) |
| Vapor Density | ~6.5 (vs air) |
| Appearance | Liquid |
| Color | Clear colorless to pale yellow |
| Odor | Mild, sweet odor detectable at 10 ppm |
| Exposure Limit | NIOSH REL: TWA 0.045 ppm, 15-min C 0.13 ppm, IDLH 100 ppm;OSHA PEL: TWA 20 ppm, C 30 ppm, 5-min peak 50 ppm;ACGIH TLV: suspected humancarcinogen. |
| Merck | 14,3796 |
| BRN | 605266 |
| Storage Condition | 0-6°C |
| Stability | Stable, but may be light sensitive. Incompatible with strong oxidizing agents, magnesium, alkali metals. |
| Sensitive | Light Sensitive |
| Refractive Index | n20/D 1.539(lit.) |
| Physical and Chemical Properties | Character: it is a volatile colorless liquid with special sweet taste at normal temperature and pressure. melting point 9.9 ℃ boiling point 131.4 ℃ relative density 2.1792 refractive index 1.5380 soluble in about 250 times of water, and ethanol, ether, carbon tetrachloride, benzene, gasoline and other organic solvents are miscible and form azeotrope. |
| Use | Used as an intermediate in organic synthesis |
1,2-Dibroomethaan - Risk and Safety
| Risk Codes | R45 - May cause cancer R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R36/37/38 - Irritating to eyes, respiratory system and skin. R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R34 - Causes burns R39/23/24/25 - R11 - Highly Flammable |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37 - Wear suitable protective clothing and gloves. S16 - Keep away from sources of ignition. S7 - Keep container tightly closed. |
| UN IDs | UN 1605 6.1/PG 1 |
| WGK Germany | 3 |
| RTECS | KH9275000 |
| FLUKA BRAND F CODES | 8 |
| TSCA | Yes |
| HS Code | 29337100 |
| Hazard Class | 6.1 |
| Packing Group | I |
| Toxicity | LD50 i.p. in mice: 220 mg/kg (Fischer) |
1,2-Dibroomethaan - Nature
Open Data Verified Data
at room temperature and atmospheric pressure for a volatile colorless liquid, there are special sweet. Boiling point 131.4 °c. Melting point 9.9 °c. Freezing point -8.3 °c. Refractive index 5380. Viscosity (20 C) 11 727mPa.s. Surface tension (20 °c) 38.91mN/m. The relative density was 2.1792. Vapor pressure (20 °c) 1-133kPa. Relatively stable at room temperature, but in light can slowly decompose into toxic substances. Soluble in about 250 times of water, and ethanol, ether, carbon tetrachloride, benzene, gasoline and other organic solvents miscible, and the formation of azeotrope.
Last Update：2024-01-02 23:10:35
1,2-Dibroomethaan - Preparation Method
Open Data Verified Data
- the industrial production of ethylene bromination method adopts non-catalytic addition of ethylene and bromine, the reaction rate increases with the increase of reaction temperature, and the presence of water vapor can accelerate the reaction. Excess ethylene and HBr are contained in the exhaust gas, HBr is removed by washing with water in the washing Tower, and then excess ethylene is recovered.
- bromination of ethane
- ethylene glycol and hydrogen bromide reaction method
Last Update：2022-01-01 10:14:16
1,2-Dibroomethaan - Use
Open Data Verified Data
used as an ethylation reagent and solvent; Used as a nematicide and a synthetic plant growth regulator in agriculture; Used as an intermediate for synthesizing diethylbromophenylacetonitrile in medicine; Used as a flame retardant for bromoethylene and vinylidene dibromobenzene; it is also used as the elimination agent of lead in gasoline anti-seismic liquid, metal surface treatment agent and fire extinguishing agent.
Last Update：2022-01-01 10:14:17
1,2-Dibroomethaan - Safety
Open Data Verified Data
- vapor toxic, high concentration can cause anesthesia, general anesthesia can cause pulmonary edema death. The lowest poisoning concentration in the air 25*10-6. Inhalation lethal concentration was 1000 × 10-6. It is carcinogenic to rodents. The maximum allowable concentration in air is 130 × 10 -9. The vapor irritates the respiratory tract, damages the liver and kidneys. Liquid contact with the skin can cause ulceration. When contaminated, should immediately take off the coat, dry the skin. Production sites should be well ventilated, equipped with gas masks and protective clothing.
- storage and transportation conditions and protection requirements are the same as (a) methyl bromide, and avoid contact with aluminum, magnesium, potassium, sodium, or contact with strong alkali and chlorine-rich substances. The Joint International Air Transport Code is article 727 poison B.
Last Update：2022-01-01 10:14:17
1,2-Dibroomethaan - Reference Information
| olfactory Threshold | 10 ppm |
| Henry's Law Constant | 7.58(x 10-4 atm?m3/mol) at 25 °C (static headspace-GC, Welke et al., 1998) |
| (IARC) carcinogen classification | 2A (Vol. 15, Sup 7, 71) 1999 |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | 1, 2-dibromoethane can be used as an ethylation reagent and solvent; It is used as a nematicide in agriculture, synthetic plant growth regulator; Pharmaceutically used for the synthesis of diethylbromophenylacetonitrile intermediates, ethylene bromide, ethylene-dibromobenzene flame retardant; Also used as gasoline anti-shock liquid lead elimination agent, metal surface treatment agent and fire extinguishing agent. Motor gasoline uses a mixture of dibromoethane and dichloroethane to reduce cost, while aviation gasoline uses pure dibromoethane. |
| Use | used as ethylation reagent and solvent; Used in agriculture as nematicide and synthetic plant growth regulator; it is used as an intermediate in the synthesis of diethylbromobenzene acetonitrile in medicine, as a flame retardant for bromoethylene and vinylidene dibromobenzene. It is also used as a elimination agent for lead in gasoline anti-seismic liquid, a metal surface treatment agent and a fire extinguishing agent. Motor gasoline uses a mixture of dibromoethane and dichloroethane to reduce cost, while aviation gasoline uses pure dibromoethane. used in organic synthesis, also used as solvent used as intermediate in organic synthesis |
| production method | 1. Ethylene bromination industrial production using ethylene and bromine for non-catalytic addition, the reaction rate increases with the reaction temperature, the presence of water vapor can accelerate the reaction. Excess ethylene and HBr are contained in the exhaust gas, HBr is removed by washing with water in a washing Tower, and then excess ethylene is recovered. 2. Method for bromination of ethane. 3. Ethylene glycol and hydrogen bromide reaction method. |
| category | pesticide |
| toxicity grade | high toxicity |
| Acute toxicity | oral-rat LD50: 108 mg/kg; Oral-mouse LD50: 250 mg/kg |
| stimulation data | Skin-rabbit 1% /14 day weight; eye-rabbit 1% moderate |
| flammability hazard characteristics | bromide gas generated by thermal decomposition |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from oxidants and food additives |
| extinguishing agent | dry powder, foam, carbon dioxide, sand. |
| Occupational Standard | TWA 145 mg/m3; Tel 225 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
| immediate life-threatening and health concentration | 46 ppm (354 mg/m3) |
Last Update：2024-04-10 22:29:15
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