Sodium nitrite

Molecular formula: NaNO2

Property: it is white or slightly yellowish orthorhombic small crystal or powder, melting point 271 ℃, slightly salty, easy to deliquescence, easily soluble in water and liquid ammonia, water-soluble alkaline, slightly soluble in methanol, ethanol, ether, etc. It can slowly oxidize into sodium nitrate in the air and begin to decompose when heated to 320 ℃, and combustion explosion will occur in contact with organic matter. Sodium nitrite is toxic. After human intake into the blood, it can oxidize normal hemoglobin into iron blood eggs

Application: it is an important inorganic chemical product with a wide range of uses. It is mainly used in the production of various dyes, dye AIDS and h-hair emulsion. It is also used in the production of intermediates such as nitrobenzene and p-aminophenol, as well as the production of organic pigments. Medicine is used in the manufacture of hexamine pyridine, acylpyrine, analgin, furazolidone, etc. Pesticides are used in the manufacture of Phoxim, methomyl, etc; Metal heat treatment agent and electroplating corrosion inhibitor are used as improvers and preservatives for meat food. They are mainly used as mordants for dyeing a variety of fabrics and bleaches for silk, cotton and hemp in the textile industry. In addition, they are also used in fine chemicals, such as the production of vanillin. At present, China has become the largest vanillin production and supply country in the world, It accounts for about 45% of the world's production and consumes a large amount of sodium nitrite every year. At the same time, the amount of concrete antifreeze has increased greatly in winter construction in recent years.

Executive standard: GB2367-2006