Sodium metabisulfite (Na2S2O5), an inorganic compound, is white or yellow crystal with a strong pungent odor. It is soluble in water, and the aqueous solution is acidic. When it contacts with strong acid, it releases sulfur dioxide and generates corresponding salts. If it is put in the air for a long time, it will be oxidized to sodium sulfate, so sodium pyrosulfite cannot be stored for a long time.
Physical and chemical properties editing
Melting point: 150 ºC [2]
Density: 1.48g/cm3 [2]
PSA:124.92000 [2]
LogP:0.27220 [2]
Appearance: white crystalline powder with the odor of sulfur dioxide
Solubility: soluble in water, and the aqueous solution is acidic. Soluble in glycerin, slightly soluble in ethanol.
Main purpose
For the production of sodium hydrosulfite, sulfamethazine, analgin, caprolactam, etc; Used for purification of chloroform, phenylpropylsulfone and benzaldehyde. Ingredients used as fixing agent in photographic industry; The spice industry is used to produce vanillin; Used as preservative in brewing industry; Rubber coagulant and dechlorination agent after bleaching of cotton cloth; Organic intermediates; Used for printing, dyeing and tanning; Used as reducing agent; It can be used as waste water treatment in electroplating industry, oil field and mineral processing agent in mines; It is used as antiseptic, bleach and loosening agent in food processing.
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