Chinese name: sodium nitrite
English name: Sodium nitrite
CAS NO：7632-00-0
EC NO：231-555-9
UN：1500
Molecular formula: NaNO2
Molecular mass: 68.99
The appearance is white or slightly band light yellow crystal, the relative molecular weight is 68.99, and the specific gravity is 2.168. Odorless, slightly salty, easy to deliquescence, easily soluble in water, melting point of 271 °C, decomposition temperature 320 °C, oxidizing and reductive. It slowly oxidizes to sodium nitrate in the air, and is prone to amino formation of diazo compounds at low temperatures.
This product is mainly used as raw materials for the manufacture of nitro compounds, even ammonia dyes, etc., mordants for fabric dyeing, bleach. It is also used as a metal heat treatment agent, cement drought agent and antifreeze agent.
1. This product should be stored in a cool and dry place to prevent moisture, heat and sun exposure.
2. This product shall not be mixed with strong reducing agents, flammable and explosive products, food, feed and additives.
3. This product is toxic, should be properly kept, do not eat by mistake.
GB/2367-2006
Performance characteristics:
Physical
White to light yellow granules, rods or powders. It is hygroscopic. Soluble in 1.5 parts cold water, 0.6 parts boiling water, slightly soluble in ethanol. The relative density is 2.17. The melting point is 271°C.
Chemical properties
Its aqueous solution is alkaline, a strong oxidant and reductive,
In the air will gradually oxidize, the surface will become sodium nitrate, heated to more than 320 °C decomposition, can also be oxidized by oxidants; In case of weak acid, brown nitrogen dioxide gas is liberated; Contact with organic matter and reducing agent can cause explosion or combustion, and release toxic and irritating nitrogen oxide gas; In the case of strong oxidants can also be oxidized, especially ammonium salts, such as ammonium nitrate, ammonium persulfate, etc. at room temperature, that is, they can interact with each other to produce high heat, causing combustible combustion. Oxidizing, it can burn and explode in contact with organic matter, and emit toxic and irritating nitrogen peroxide and nitrogen oxide gases.
Sodium nitrite is toxic, half of the lethal amount (rats, through the mouth) 180mg / kg [1], there are rumors that sodium nitrite is a carcinogen, but in fact sodium nitrite is not a carcinogen, carcinogenic is sodium nitrite produced under certain conditions of nitrosamine, in the sodium nitrite molecule, the compound price of nitrogen is +3. It is an intermediate state that has both reducing and oxidizing properties, such as oxidizing KI into elemental iodine in acidic solutions.
Technical parameters:
The project name | unit | First class | Qualified products |
Sodium nitrite | %≥ | 98.5 | 98.00 |
sodium nitrate | %≤ | 1.00 | 1.90 |
chloride | %≤ | 0.17 | — |
Water insoluble | %≤ | 0.06 | 0.10 |
Water | %≤ | 2.00 | 2.50 |
appearance | White or colorless transparent crystals | ||
