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Sodium Nitrite

Sodium Nitrite in Tradeasia

IUPAC Name

sodium nitrite

Cas Number

7632-00-0

HS Code

28341000

Formula

NaNO2

Basic Info

Appearance

White or slightly yellowish crystalline powder

Common Names

Nitrous Acid, Sodium Salt

Packaging

25 Kg Bag

Brief Overview

Sodium Nitrite is an inorganic compound with the chemical formula NaNO2 and is the sodium salt of nitrous acid HNO2. It forms white to slightly yellowish crystalline powder in the pure state. Sodium nitrate is hygroscopic and very soluble in water. It can be found in nature in several vegetables, such as spinach, parsley, lettuce, broccoli, curly kale, and asparagus. It also can be found in the human body to control bacteria in the stomach and prevent gastroenteritis.
 Sodium nitrite can be manufactured by reacting sodium hydroxide with nitrogen monoxide and nitrogen dioxide. The product from this process is sodium nitrite, which is diluted in water. To obtain crystalline sodium nitrite, the solution undergoes the next stage, evaporation. Sodium nitrite can be decomposed into sodium dioxide, nitrogen dioxide, and oxygen when heated at high temperatures. Also, on a laboratory scale, sodium nitrite can be used to destroy excess sodium azide.

Manufacturing Process

The manufacturing process of sodium nitrite is by reacting sodium hydroxide with nitrogen dioxide and nitrogen monoxide. The product of this reaction is sodium nitrite and water. Sodium carbonate also can use as a sodium hydroxide substitute. The overall reaction of manufacturing sodium nitrite is shown below:
 
 2NaOH + NO2 + NO → 2NaNO2 + H2O
 
 The manufacturing process of sodium nitrite comprises the steps:
 (1) Absorption of nitrogen oxide in sodium hydroxide or sodium carbonate liquid
 Nitrogen dioxide and nitrogen monoxide can be obtained from the manufacturing process of ammonia. It is preferable to use excess nitrogen oxide than nitrogen dioxide to increase the production of sodium nitrite and minimize the production of sodium nitrate. The absorption reaction of nitrogen dioxide and nitrogen monoxide in sodium hydroxide produces a sodium nitrite solution.
 (2) Evaporation
 Sodium nitrite solution that obtained and then being cooled to crystallize. The product is suspensions that contain solid crystalline sodium nitrite in water. To increase the concentration, the suspension is heated until containing water evaporates. The evaporation process separates crystalline sodium nitrite from the mother liquor.

Food Industry
 
 Sodium nitrite has mainly been used as a food stabilizer and additive since the 1990s. As a food preservative, it prevents the growth of bacteria, such as Clostridium botulinum, that can cause botulism disease. Sodium nitrite also added colour and taste to the non-vegetable food. Sodium nitrite can be found in fish and meat bacon, such as smoked fish, hot dogs, and luncheon meats. For safety, the use of sodium nitrite as a food additive is limited to a certain amount.
 
 Pharmaceutical Industry
 
 In the pharmaceutical industry, sodium nitrite treats several diseases and organ damage. Sodium nitrite can prevent cell death in a damaged organ such as the heart, lungs, and liver. It is also used as a treatment for brain aneurysms, pulmonary hypertension, and Pseudomonas aeruginosa. Another use of sodium nitrite is to treat cyanide poisoning. But now, it has been replaced by hydroxocobalamin.
 
 Agriculture Industry
 
 Sodium nitrite is used as fertilizer and a pesticide for several plants. In fertilizer, sodium nitrite increases the amount of nitrogen required for plant growth. It also strengthens the roots and prevents soil erosion. Insecticides, predacides, and rodenticides are examples of pesticides that use sodium nitrite. Sodium nitrite does not directly harm pests and is environmentally safe.
 
 Other Application
 
 Other applications of sodium nitrite are the manufacturing of nitroso compounds, metal coatings for detinning and phosphating, corrosion inhibitors, photography, an inhibitor of polymer, pulp and paper industries, lubricants, industrial and household cleaners, anti-freeze liquid, rubber processing, raw material for caffeine and saccharine production, water treatment, etc. Moreover, Sodium nitrite is often used as a dyeing and bleaching agent in the textile industry.

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