Sodium azide
Sodium azide
CAS: 26628-22-8
Molecular Formula: N3Na
Sodium azide - Names and Identifiers
| Name | Sodium azide |
| Synonyms | nsc3072 nemazyd nci-c06462 Sodium azide azoturedesodium Sodium azide,azium Sodium azide white powder SODIUM AZIDE REAGENT (ACS) Sodium Azide (For Air Bag) |
| CAS | 26628-22-8 |
| EINECS | 247-852-1 |
| InChI | InChI=1/N3.Na/c1-3-2;/q-1;+1 |
Sodium azide - Physico-chemical Properties
| Molecular Formula | N3Na |
| Molar Mass | 65.01 |
| Density | 1.85 |
| Melting Point | 275 °C |
| Boling Point | 300 °C |
| Flash Point | 300°C |
| Water Solubility | 420 g/L (17 ºC) |
| Solubility | H2O: 1M at20°C, clear, colorless |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | Powder/Solid |
| Specific Gravity | 1.85 |
| Color | White to off-white |
| Odor | Odorless solid |
| Exposure Limit | Ceiling 0.3 mg/m3 in air (ACGIH). |
| Merck | 14,8581 |
| pKa | pK = 4.8, aq solns contains HN3 which escapes readily at 37° |
| Storage Condition | 2-8°C |
| Stability | Unstable. Avoid heat, sources of ignition, moisture, shock, friction. Incompatible with strong oxidizing agents, mineral acids, water, halogen acids and halogen compounds, barium carbonate, bromine, c |
| Sensitive | Air & Moisture Sensitive |
| Physical and Chemical Properties | Character: colorless hexagonal crystals. relative density 1.846g/cm3 solubility in water at 10 ° C. Is 40g/100g. Soluble in water and liquid ammonia, ethanol-soluble and benzene, insoluble in ether. |
| Use | For organic synthesis, determination of oxygen content in sewage, serum preservatives, etc |
Sodium azide - Risk and Safety
| Risk Codes | R28 - Very Toxic if swallowed R32 - Contact with acids liberates very toxic gas R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R22 - Harmful if swallowed R27 - Very Toxic in contact with skin R21/22 - Harmful in contact with skin and if swallowed. |
| Safety Description | S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S60 - This material and its container must be disposed of as hazardous waste. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S28A - S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 1687 6.1/PG 2 |
| WGK Germany | 2 |
| RTECS | VY8050000 |
| TSCA | Yes |
| HS Code | 28500060 |
| Hazard Class | 6.1 |
| Packing Group | II |
| Toxicity | LD50 in rats (mg/kg): 45 orally (Frederick, Babish) |
Sodium azide - Upstream Downstream Industry
| Raw Materials | hydrazine hydrate hydrazine hydrate Sodium nitrite Sodium nitrite Ethyl Alcohol 1-Butanol |
| Downstream Products | 5-mercapto-1-methyltetrazole |
Sodium azide - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| toxicity | highly toxic, inhaling its vapor, causing headache, blood pressure drop, bronchitis and collapse. Percutaneous absorption. If sodium azide is injected intravenously with a solution of 1mg every day, the blood pressure will drop, the blood circulation in the end of the blood vessels and the coronary arteries will improve, and it will cause arteriosclerosis and paralysis, but if you drink it by mistake 1.5ml of the 10% solution, Symptoms such as difficulty breathing, rapid pulse, vomiting and thirst will occur. Mice were orally administered LD5042mg/kg, rats were orally LD5045mg/kg, and intraperitoneally injected 18 mg/kg. U.S. atmospheric environmental standards stipulate that the maximum allowable concentration is 0.1ppm (0.3mg/m3). |
| Use | Used as a raw material for medicine, tetrazole compounds are prepared from sodium azide, and antibiotic cephalosporin drugs are further synthesized, and tetrazole compounds are still color photography medicine. Used as the raw material of lead azide as the detonator for heat-resistant special detonators. synthetic resin foaming agent. Used to absorb and remove residual gas in the vacuum tube. since the 1990s, sodium azide has been used as the air source for the safety protection bag of car drivers. when braking in an emergency, it will automatically inflate immediately. The principle of gas generation is: 2NaN3 CuO → Na2O 3N2 Cu 16NaN3 3MoS3 2S → 8Na2S 3Mo 24N2 10NaN3 2KNO3 SiO2 → 5Na2O · K2O · 5SiO2 16N2 used as organic synthesis raw materials, pesticide raw materials and analytical reagents. Used as medicine and explosives, also used to make azide acid, azide acid ester, lead azide and pure metal sodium. Sodium azide is a preservative for photographic emulsions. It can be added to the emulsion, or added to the intermediate layer and protective layer, without affecting the photographic performance of the emulsion, and has excellent anti-corrosion and sterilization properties. Used in organic synthesis, oxygen content determination of sewage, serum preservatives, etc. Biochemical research |
| Preparation method | 1, using metal sodium as raw material, reacting with ammonia to produce sodium amide, sodium amide and nitrous oxide at 190 ℃ Reaction can produce sodium azide [1]. Ammonia recovery further reacts with metal sodium to prepare sodium amide. [1] Dissolve sodium hydroxide in a small amount of water, heat and concentrate, then [1] precipitate first, filter out, and then recrystallize in water to be refined [1]. 2. Dissolve hydrazine hydrate in anhydrous ether, add a mixed solution of sodium hydroxide and ethyl nitrite under water cooling, and react it under cold conditions. After the reaction is completed, heat it slowly to restore it. To room temperature. Crystallization is precipitated, suction filtration, crystallization is taken out, washed with methanol and ether, and then recrystallized in water to obtain sodium azide. C2H5ONO NH2 · NH2 · H2O NaOH → NaN3 C2H5OH 3H2O 3, sodium methoxide can also be prepared instead of sodium hydroxide in the above method. |
| solubility in water (g/100ml) | dissolution grams per 100ml of water at different temperatures (℃): 38.9g/0 ℃;39.9g/10 ℃;40.8g/20 ℃ |
| category | toxic substances |
| toxicity classification | highly toxic |
| acute toxicity | oral-rat LD50: 27 mg/kg; Oral-mouse LD50: 27 mg/kg |
| Explosive hazard characteristics | Explosive mixed with heavy metals and heavy metal salts |
| flammability hazard characteristics | easy to explode azidic acid when decomposed by acid |
| storage and transportation characteristics | light and light; the warehouse is ventilated, away from open flames, high temperature, and sunlight; separate from oxidants and combustibles |
| fire extinguishing agent | mist water, foam |
| occupational standard | TWA 0.3 mg/m3; STEL 0.9 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-06-05 16:47:10
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