Anhydrous Sodium Sulphite

Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform,solasulfone and Benzaldehyde in medical industry.

Molecular Formula : Na₂SO₃

Molecule Weight : 126.04

CAS NO .: 7757-83-7

Appearance : White Free Flowing Fine Crystal or Powder

Purpose:

(1) Printing and dyeing industry as a filter and bleach, leather industry as a bleach, developer, reductant, stabilizer and used in papermaking, electronics, water treatment and so on.

(2) As additive (e223) preservatives, antioxidants and antimicrobial agents in the food industry, such as fruits, vegetables, juices (Citrus and grapes) and seafood. It is used as an anti fermenting agent during storage and plays a role in the production of starch and saccharin.

(3) Used as developer in photosensitive industry;

(4) The pharmaceutical industry is used to produce chloroform, phenylpropanesulfone and benzaldehyde

Packing: 25kg plastic woven bag or customized according to customer requirements.

Storage: store in a dry and cool place.

Quality Standard：

Item	Index
Item	Superior products	First Grade	Qualified products
Na2SO3%≥	98	97	96
Fe%≤	0.003	0.003	0.005
Water insoluble matter%≤	0.01	0.02	0.03
Free alkali (Na2CO3) content%≤	0.001	0.1	0.4
Na2SO4%≤	1.2	2.5	2.5
Nacl%≤	0.003	0.1	0.1

Properties

Sodium sulfite is an inorganic compound. It is a white granular powder at room temperature, soluble in water and reducing. It is disproportioned into sodium sulfide and sodium sulfate when heated and gradually oxidized into sodium sulfate when placed in air. It can exist in three forms: anhydrous matter, heptahydrate and decahydrate, of which anhydrous matter is the most difficult to be oxidized. Its aqueous solution is alkaline due to hydrolysis and releases toxic sulfur dioxide gas during acidification. Sodium sulfite can be prepared by introducing sulfur dioxide into sodium hydroxide solution. When sulfur dioxide is excessive, sodium bisulfite will be generated. Sodium sulfite can be used as developer, preservative of dried fruit and meat, Deoxidizer in printing and dyeing industry, and reducing chemical reagent. It is used in chemical industry and laboratory production and synthesis.

CAS No.

7757-83-7

Formula

Na2O3S

Molecular Mass

126.04300

Exact Mass

125.93600

PSA

82.40000

Logp

-0.13840