Properties of Sodium Metabisulfite

  • Author:Ray Dean
  • Release on :2016-06-02

Sodium Metabisulfite is white or yellow crystalline powder or small crystals, with sulfurous odor, specific gravity 1.4, soluble in water, acidic aqueous solution, emit sulfur dioxide into contact with a strong acid to form the corresponding salts. Sodium metabisulfite can not go far, packaging and storage should be sealed to prevent air oxidation. Soluble in water soluble in glycerine, slightly soluble in ethanol. Damp decomposition, exposed in the air easily oxidized into sodium sulfate. Contact with acid emit sulfur dioxide to form the corresponding salts. It was heated to 150 decomposition. Widely used in the chemical, medical, brewing and other industries use; used for dyeing, organic synthesis, printing, leather, pharmaceutical and other departments on; as a preservative, bleach, bulking agent in food processing.


For the production of sodium hydrosulfite, sulfamethazine dipyrone, caprolactam and purification of chloroform, styrene sulfone and benzaldehyde. Photographic industry as ingredients fixer. Perfume industry for the production of vanillin. Used as a preservative brewing industry, rubber coagulant and bleaching cotton after dechlorination agent. Organic intermediates, dyes, tanning as a reducing agent used for the electroplating industry, waste water treatment and as a mine field of processing agents.


The pharmaceutical industry for the production of chloroform, styrene sulfone and benzaldehyde. Rubber industry as a coagulant. Cotton dyeing industry as a bleaching agent after dechlorination, cotton scouring additives. Leather tanning industry for leather processing, make leather soft, plump, tough, waterproof, bending, wear-resistant properties. The chemical industry for the production of hydroxyl vanillin, hydroxylamine hydrochloride. Photographic industry as a developer and the like.