what is sodium metabisulfite

Sodium metabisulfite is an inorganic compound with the chemical formula Na2S2O5. It is in the form of white crystalline powder with a smell similar to sulfur dioxide. Oral sodium metabisulfite as a preservative prevents the growth of bacteria. This white powder is soluble in water; It is used in both industrial and edible grades in food, pharmaceutical and water purification industries.

What is the use of sodium

metabisulfite

Sodium metabisulfite is added as an additive to medications containing adrenaline (epinephrine) to prevent the oxidation of adrenaline. It is used in combination with sodium hydrosulfite as a rust remover. It is also used as a supplement in some tablets, such as paracetamol, in pharmaceuticals. A very important aspect of the health of this substance is that it can be added to blood smears in the test for sickle cell anemia. This substance causes the lost cells to become sickled and thus confirms the disease. It is used as a whitening agent in the production of coconut cream. This substance is used as a reducing agent to break sulfide bonds in shrunken clothing made from natural fibers, allowing the garment to return to its original shape after washing. It is used as a source of SO2 for cyanide destruction in commercial gold cyanidation processes.

In the water purification industry, it is utilized to eliminate residual chlorine and neutralize cyanides. It is employed in the color etching of metal samples containing iron for microstructural analysis. It is used for preserving fruits during transportation and widely applied for food and beverage preservation. Additionally, it serves as a solvent in the extraction processes of starch, fruits, and cereals. It is also utilized for purifying chloroform, phenyl propyl sulfone, and benzaldehyde. In rubber manufacturing, it acts as a cross-linking agent. In the leather industry, it provides softness, water resistance, and resistance to stretching during processing while also dissolving tanning extracts. Furthermore, it is used as a sulfonating agent and reducing agent for surfactants and polymerization processes. Its applications also extend to gold refining.

Production method of sodium meta bisulfite

Once the NaHSO3 (sodium bisulfite) solution is saturated with SO2 (sulfur dioxide), it is allowed to evaporate. The residue of this reaction will be sodium meta bisulfite.

The free sodium ions in this solution form an ionic bond with sodium meta bisulfite, and as a result, the solid substance Na2S2O5 is formed.

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