Basic information
anhydrous sodium sulfite, or as a white crystalline powder; odorless. This product is soluble in water and soluble in water (12.54g/100ml water at 0°C; 28.3g/100ml water at 80°C). The solubility is about 28% at 33.4°C. The aqueous solution is alkaline and the pH is about It is 9~9.5. It is easily oxidized to sodium sulfate in the air and decomposed into sodium sulfide in case of high temperature. In order to strengthen the reducing agent, it reacts with sulfur dioxide to form sodium hydrogen sulfite, and reacts with a strong acid to form a corresponding salt.
Index
|
Index name
|
Top grade
|
First grade
|
Qualified product
|
|
Appearance
|
White crystal powder
|
|
Mass fraction of sodium sulfite (Na2SO3) /% ≥
|
97.0
|
96.0
|
93.0
|
|
Iron (Fe) /% ≤
|
0.003
|
0.005
|
0.02
|
|
Water insoluble matter /% ≤
|
0.02
|
0.03
|
0.05
|
|
Free alkali ( calculated as Na2SO3) /% ≤
|
0.10
|
0.40
|
0.60
|
|
Sulfate (Na2SO4)/% ≤
|
2.5
|
One
|
One
|
|
Chloride (NaCl) /% ≤
|
0.10
|
One
|
One
|
Uses
1. Anhydrous sodium sulfite is used for film development
2, as a reducing agent and sulfonating agent in the chemical industry;
3. Dechlorination and bleaching agents in the printing and dyeing industry;
4. Stabilizers for chemical fibers, etc.
Cautions for storage and transportation
It shoud be stored in a cool, dry and ventilated warehouse. Keep away from the heat of the fire. The package is sealed and must not be in contact with air. Do not store and transport with oxidants, strong acids and hazardous materials. This product is deliquescent and should not be stored for a long time. Protect from rain and sun exposure when transporting.
