Definition and Usage Areas of Sodium nitrite

Sodium nitrite is a component in heat transfer salts used by many branches of industry such as the chemical, petrochemical and metalworking industries. Easily soluble in water, results in weak alkaline solutions. The preparation of solutions is accompanied by a decrease in temperature. Sodium nitrite is soluble in aqueous ammonia and various organic solvents (such as ethanediol, propanediol and methanol). Sodium nitrite can act as an oxidizing and reducing agent.

Iron-steel, Al and many other metals do not decompose with sodium nitrite and its solutions. The presence of chlorides and sulfates can promote corrosion of metals. Rubber, plastics, glass, porcelain and ceramics are resistant to sodium nitrite solutions. Treatment of sodium nitrite solutions with acids can result in the formation of nitric acid, which rapidly decomposes into nitro gases with a pale to dark brown color. In deisotization and nitrosation processes, nitric acid can react with other reactants before decomposing into nitrous oxide phases. It reacts with sodium nitrite, ammonium salts, amides and mixtures containing them at room temperature. This reaction can go as far as a violent explosion. Subsequently, exacerbation follows. Similar reactions It may occur with products that can oxidize rapidly, such as sodium and potassium metabisulfite. Powdered with sodium nitrite, wool and cotton and other textile tissues are quickly flammable.

Usage areas

• It is used in tank rinsers used for the production of azo dyes, the production of diazo compounds, the production of nitroso and isonitrozo compounds, the stabilization of nitric acid gases, the delivery and storage of butadiene.
• For textile dyeing and printing: Dyeing and printing diazotization; oxidation of printing and dyeing with colorless barrel dyes; protection against reduction during printing and dyeing with certain vat dyes; It is used to trigger accelerated oxidation of barrel paints that resist reoxidation.
• accelerator during phosphating; in the preparation of baths for hot-worked metals; steel deposition and cast iron; as an additive to alkaline pickling baths of aluminum and aluminum alloys; It is used in neutral cleaner and deactivating baths.
• In water recovery systems, cooling water and cooling liquids (antifreezes); in crushing oils, hydraulic fluids, lubricants, extinguishers; in chemical processes; in the production of solid and liquid anti-corrosion agents; in the production of emulsion paints; antioxidant for special soaps; additive for glazing of glass raw materials; in water circulation systems; as an additive in concrete with special properties; as an anti-corrosion agent for steel and iron; It is used in the production of products used to protect oil fuel tanks from corrosion.
• It is used as a preservative in foods. Inhibits bacterial growth and discoloration, generally