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[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage methods of sodium metabisulfite, sodium metabisulfite is widely used and is the most common

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Sodium metabisulfite properties

Sodium metabisulfite (Na₂ S₂ O₂), also known as sodium metabisulfite, is an inorganic compound that appears as a white or light yellow crystalline powder with a strong pungent odor. Its molecular weight is 190.10. Sodium metabisulfite is soluble in water, acidic reaction after dissolution, and easy to oxidize. It is chemically active and decomposes at high temperatures to produce sulfur dioxide (SO₂) and sodium sulfate (Na₂ SO₂). This property makes it versatile in industrial applications.

Sodium metabisulfite use

Sodium metabisulfite is widely used in all walks of life. Its main uses include:

Food industry: Sodium metabisulfite is widely used as a food additive, mainly as a preservative and antioxidant. It can inhibit the growth of yeast and bacteria and extend the shelf life of food. Sodium metabisulfite is also used in wine and fruit juices to prevent oxidation and browning.
Chemical industry: In the chemical industry, sodium metabisulfite is used to produce other chemicals such as sodium metabisulfite and sodium sulfate. It is also used as a reducing agent, especially in the dye and textile industries, for decolorization and removal of residual chlorine.
Water treatment: Sodium metabisulfite is used in water treatment process, mainly used to remove chlorine and chloramine in water to ensure the safety and stability of water quality.
Pharmaceutical Industry: In the pharmaceutical industry, sodium metabisulfite is used as a stabilizer and antioxidant to help extend the shelf life of pharmaceutical products and protect the active ingredients of pharmaceutical products.
Photographic industry: In the photographic industry, sodium metabisulfite is used to prepare a fixing solution to help remove undeveloped silver halide and ensure the quality of photos.

Sodium metabisulfite upstream and downstream raw materials

Upstream raw materials

The production of sodium metabisulfite mainly depends on several key upstream raw materials:

Sulfur: As the main raw material for the production of sulfur dioxide, sulfur is burned to produce SO.
Sodium carbonate (Na₂ CO ): Sodium carbonate reacts with sulfur dioxide to form sodium metabisulfite.
Water: In the production process, water is used as a solvent and reaction medium.

Downstream Products

As an intermediate or raw material, sodium metabisulfite is widely used in the manufacture of a variety of products:

Food additives: sodium metabisulfite made of preservatives and antioxidants.
Chemical: Used to prepare other chemicals, such as sodium metabisulfite.
Pharmaceuticals: Used in the production of stabilizers and antioxidants.

Sodium metabisulfite storage method

Since sodium metabisulfite has the characteristics of easy deliquescence and oxidation, its storage conditions require special attention. When storing sodium metabisulfite, ensure the following:

Moistureproof: Sodium metabisulfite is hygroscopic, so it should be stored in a dry environment. Sealed packaging can effectively prevent moisture absorption.
Anti-oxidation: long-term contact with air should be avoided, because sodium metabisulfite is easily oxidized in the air and loses its activity. Use a sealed container when storing, and minimize the amount of air in the container.
Avoid light storage: prolonged exposure to light will accelerate the decomposition of sodium metabisulfite, storage should avoid direct sunlight, should be stored in a cool place.
Temperature control: Sodium metabisulfite will decompose at high temperature, so the storage temperature should be kept at room temperature or low temperature environment to avoid high temperature environment.
Keep away from acidic substances: Acidic substances will react with sodium metabisulfite to release sulfur dioxide gas, so avoid storage with acidic substances.

Conclusion

As an important chemical product, sodium metabisulfite has a wide range of applications. Its excellent anti-corrosion, anti-oxidation and reducing properties make it play an important role in food, chemical, water treatment, pharmaceutical and photography industries. The active chemical nature of sodium metabisulfite also requires appropriate protective measures during production, storage and use to ensure safety and product quality. Understanding its nature, use and upstream and downstream raw materials, as well as mastering the correct storage method, is the key to ensure the effective application of sodium metabisulfite.

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