SODIUM METABISULFITE is a white to slightly yellowish, crystalline powder with a odour of sulfur dioxide. Content of sulfur dioxide at least 65.5 %-wt.
Alternative names :
Sodium pyrosulfite; sodium disulfite; sodium metabisulphite; disulfurous
acid, disodium salt; disodium disulfite.
Properties:
Melting temperature: decomposition starts at 150 °C
Density (20 °C): 1.48 g/cm3
Bulk density: 1000 - 1200 kg/m3
Solubility in water (20 °C): 470 g/l
pH-value ( 50 g/l, 20 °C): 3.5 - 5
Applications:
# In the chemical and pharmaceutical industries: as a reducing agent, for purifying and isolating aldehydes and ketones. For destroying waste bromine.
# In drinking water treatment to remove excess chlorine and chloramines and protect RO membranes.
# In the treatment of wastewater, particularly from electroplating plants, to neutralize chromic acid; to remove excess chlorine in the neutralization of cyanide. In special cases to remove oxygen from boiler feed water.
# In textiles for cleaning and bleaching wool, jute, and other vegetable fibres.
# In the paper and pulp industry for bleaching ground wood.
# in bakery products as reducing agents, it loosens the dough, reduces its rest time and facilitates the kneading. As a preservative in fruits and starch
Mostly used as a preservative in the starch and food industry to control melanosis (black spot) in shrimp; for fermentation in the wine industry; as an antichlor in the chemical industry and as a redox catalyst in the acrylic fibre industry. The product is also used as a reducing agent in the purification of aldehydes and ketones; in the manufacture of sulphonated oil and resin; for detoxification of cyanide in gold ore processing plants and in the manufacture of photographic chemicals.
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Regards,
MT
