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Chemical Name：Sodium nitrite
CAS NO：7632-00-0
Molecular formula：NaNO2
Molecular weight：68.9953
Structural formula：
Specification：
Properties：white or light yellow fine crystal, odorless, slightly salty, easy delix.
Purity：99%
Melting point (℃) ：271
Solubility：easily soluble in water, slightly soluble in ethanol, methanol, ether.
Physical properties：white to pale yellow granular, rod or powder. It is hygroscopic. Decompose when heated to more than 320℃. Slowly oxidizes to sodium nitrate in the air. Decomposition of weak acid releases brown nitrous oxide gas. Soluble in 1.5 parts cold water, 0.6 parts boiling water, slightly soluble in ethanol. The aqueous solution is alkaline with a pH of about 9. It is oxidizing and can burn and explode in contact with organic matter and give off poisonous and irritating nitrogen peroxide and nitrogen oxide gases. Medium toxicity, median lethal dose (rats, orally)180mg/kg.
Chemical properties：strong oxidant and reductive, sodium nitrite in the air will gradually oxidize, the surface will become sodium nitrate, can also be oxidized by oxidant; In case of weak acid decomposition, brown nitrogen dioxide gas is emitted; Contact with organic matter and reducing agent can cause explosion or combustion, and release toxic irritant nitrogen oxide gas; In case of strong oxidants can also be oxidized, especially ammonium salt, such as ammonium nitrate, ammonium persulfate and other at room temperature, that is, can interact with high heat, cause combustion of combustible materials. Sodium nitrite is toxic, there are rumors that sodium nitrite is carcinogenic substances, but in fact sodium nitrite is not carcinogenic substances, carcinogenic sodium nitrite is produced under certain conditions of nitrosamines, in sodium nitrite molecules, the valence of nitrogen is +3. It is an intermediate compound with both reducing and oxidizing properties, such as the oxidation of KI to elemental iodine in acidic solutions.
Application：
1.Used as a common analytical reagent, oxidant and diazotization reagent, also used in the synthesis of nitrite and nitroso compounds, food additives (toxic, limited use).
2.Used as mordant, bleach, metal thermal treatment agent, corrosion inhibitor for electroplating, medicine used as disinfectant, preservatives and other instruments.
3. Used for the production of ice dye, sulfide dye, direct dye, acid dye, disperse dye, alkaline dye, dye aid and H hair hole agent. It is also used to produce intermediates such as amino-azobenzene and para-aminophenol. Also used in the production of organic pigments, such as silver bead R, bright red, red powder, candle red, toluidine purple red, scarlet lake, Risor red, purple paste lake CK, etc. Pharmaceutical industry used in the manufacture of pyrimidine, aminopyrazoline and so on. It is used to produce vanillin. Used as a bleach for silk and linen. Mordant for fabric dyeing. Also used for metal heat treatment and corrosion inhibitor for electroplating. Used for cutting oil, lubricating oil, antifreeze, hydraulic system.
4.Meat products processing used as hair color agent, can be used for canned meat, meat products. It has certain effect on inhibiting the proliferation of microorganism in meat products (it has special effect on clostridium botulinum) and can improve the flavor of cured meat.
5.Used as butadiene and styrene emulsion copolymerization termination agent. Also used as fabric dyeing mordant, silk, linen bleaching agent, metal thermal treatment agent, electroplating corrosion inhibitor, medical vasodilator and chemical analysis reagents and manufacturing potassium nitrite, nitro compounds, azo dyes and other raw materials.
6. Antidote. The detoxification process of cyanide poisoning is the same as that of methylene blue, but the effect is stronger than methylene blue.
7.Used as butadiene and styrene emulsion copolymerization terminator. It can also be used as mordant for fabric dyeing, bleaching agent for silk and linen, metal thermal treatment agent, corrosion inhibitor for electroplating, medical vasodilator and chemical analysis reagent, as well as raw materials for manufacturing potassium nitrite, nitro compounds, azo dyes, etc.
8.Used for ice dye, sulfide dye, direct dye, acid dye, disperse dye, alkaline dye, dye aid. It is also used to produce intermediates such as para-aminophenol. Also used in the production of organic pigments, such as silver bead R, bright red, red powder, candle red, toluidine purple red, scarlet lake, Risol red and purple paste lake CK, etc. Pharmaceutical industry for the manufacture of pyrimidine, aminopyrine and so on. It is used to produce vanillin. A mordant used to bleach silk and linen and to dye fabrics. Also used for metal heat treatment and corrosion inhibitor for electroplating. Used for cutting oil, lubricating oil, antifreeze and hydraulic system.
9.Used as a preservative for water-soluble adhesives and adhesives emulsion. It is also used as raw material for the manufacture of nitro compounds, caprolactam, azo dyes, p-aminophenol, vulcanization accelerators and vanillin. It is used in medicine to manufacture drugs such as anemone, aminophylline, pyrimethamine and caffeine. In the pesticide industry, it is used to manufacture the special insecticides such as phoxiphos, pyrrhone and bacteriogenic. In the printing and dyeing industry, it is used as color developing agent for dyeing or printing cotton fiber products, diazotization agent for dyeing naftol dye and background color protection agent for drawing printing. Also used as silk, cotton, hemp bleach and butadiene oxidative dehydrogenation of distillation system polymerization inhibitor, electroplating corrosion inhibitor, metal thermal treatment agent and antifreeze agent. When food grade sodium nitrite is used as food additive, the maximum usage is 0.15g/kg.
10.Used in dyes, pharmaceutical industry to manufacture dyes and drugs, also used in organic synthesis. Storage method: Store in cool, dry, well-ventilated warehouse room, away from fire, heat source. The temperature of the storage room should not exceed 30℃, and the relative humidity should not exceed 75%. The package should be sealed and not in contact with air. It should be stored separately from reducing agents, active metal powders, acids and edible chemicals, and should not be mixed. The storage area should be equipped with suitable materials to contain leaks.
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