Sodium Bisulfite (Food) - China

IUPAC Name

:   Sodium Hydrogen Sulfite

Cas Number

:   7631-90-5

HS Code

:   2832.10.90

Formula

:  

NaHSO3

Basic Info

Appearance Name

:   White Crystalline Powder

Common Names

:   E222

Packaging

:   25 Kg PP/PE Bags

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Technical Document

Brief Overview 

Sodium bisulfite (sodium hydrogen sulfite) is a compound with the chemical formula NaHSO3. Sodium bisulfite is a food additive with E number E222. It is a white crystalline solid that turns yellow in solution. It is acidic and, therefore, corrosive. Sodium bisulfite in contact with chlorine bleach (aqueous solution of sodium hypochlorite) generates heat and forms sodium bisulfate and sodium chloride.

Manufacturing Process

This salt of bisulfite can be prepared by bubbling sulfur dioxide in a solution of sodium carbonate in water. Aqueous sodium hydroxide, sodium bicarbonate, sodium carbonate, or sodium sulfite solution are treated with sulfur dioxide to produce sodium metabisulfite solution. In one operation, the mother liquor from the previous batch is reinforced with additional sodium carbonate, which need not be totally in solution, and then is treated with sulfur dioxide. In some plants, the reaction is conducted in a series of two or more stainless steel vessels or columns in which the sulfur dioxide is passed countercurrent to the alkali. The solution is cooled, and the sodium metabisulfite is removed by centrifuging or filtration. Rapid drying, e.g., in a stream-heated shelf dryer or a flash dryer, avoids excessive decomposition or oxidation to which moist sodium metabisulfite is susceptible.

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