Medicinal grade sodium bisulfite cas7631-90-5 use

Medicinal grade sodium bisulfite cas7631-90-5 uses white or slightly yellow monoclinic crystals or powders, with a foul smell
of sulfur dioxide.
The relative density is 1.
48
。 It is very easy to oxidize in the air and release sulfur dioxide to form sulfate, which is easily soluble in water
.
It is used as an oxygen deaerator for oilfield water injection treatment system, and is a chemical deaerator and dechlorinant
that can be used as feed water of low-pressure boilers.
At present, sodium bisulfite is mostly used
as a chemical oxygen remover in medium and low pressure boilers.
Sodium bisulfite is also known as sodium
bisulfite.
Absorption of sulfur dioxide with sodium hydroxide or sodium carbonate, the reaction is done at a pH less than 5.
5, the concentration is less than 34%, there are also by-products
obtained from flue desulfurization.
NaOH+SO2→ NaHSO3 to the liquid product sodium hydroxide or sodium carbonate, and then absorb sulfur dioxide to precipitate crystals, separated by centrifugation, dried at low temperatures, to obtain anhydrous (also known as sodium metabisulfite).

2NaHSO3→ Na2S2O5 + H2ONa2S2O5 are white powders that usually decompose
little by little.
By the action of moisture, it promotes decomposition
.
2NaHSO3→Na2SO3+SO2+H2O sodium bisulfite is a colorless monoclinic crystalline crystal or white crystalline powder, with sulfur dioxide odor, molecular weight 190.
10, relative density 1.
48, decomposition at the melting point, unstable in the air, and SO2
is emitted.
It is easily soluble in water, and the aqueous solution is acidic
.
The solution is also highly reductive
.
In case of acid, sulfur
dioxide is liberated.
NaHSO3+HCl→NaCl+H2O+SO2 and aldehyde or a portion of ketones can form crystalline addition compounds, heated together with thin acids or bases, and can also regenerate these compounds, so it can be used for the separation and purification
of these products.
The use of sodium bisulfite is roughly the same as that of sodium sulfite, usually sold as a 34% solution for food preservative (except sesame seeds, beans), bleaching, dyes, drugs, pulp steamers, wheat stem bleaching, copper-plated electroplating baths, reducing agents, insecticides, etc
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