Sodium Sulfite

Sodium Sulfite

Hello, come to consult our products !

Sodium Sulfite

Appearance and appearance: white, monoclinic crystal or powder.


Melting point () : 150 (water loss decomposition)

Relative density (water =1) : 2.63

Molecular formula: Na2SO3

Molecular Weight: 126.04(252.04)

Solubility: Soluble in water (67.8g /100 mL (seven water, 18 °C), insoluble in ethanol, etc. 

Product Detail

Product Tags

Company profile

Business Type : Manufacturer/Factory&Trading Company
Main Product : Magnesium Chloride Calcium Chloride,Barium Chloride,
Sodium Metabisulphite, Sodium Bicarbonate
Number of Employees : 150
Year of Estabulishment : 2006
Management System Certification: ISO 9001
Location : Shandong,China(Mainland)

Basic information

Appearance and appearance: white, monoclinic crystal or powder.
Melting point (℃) : 150 (water loss decomposition)
Relative density (water =1) : 2.63
Molecular formula: Na2SO3
Molecular Weight: 126.04(252.04)
Solubility: Soluble in water (67.8g /100 mL (seven water, 18 °C), insoluble in ethanol, etc.

Chemical Properties

Sodium Sulfite is easily weathered and oxidized to sodium sulfate in air.Loss of crystalline water at 150℃.After heat, it melts into a mixture of sodium sulfide and sodium sulfate.The density of anhydrous matter is 2.633.It oxidizes much more slowly than hydrate and has no change in dry air.Heat decomposition and the generation of sodium sulfide and sodium sulfate, and strong acid contact decomposition into the corresponding salts and release sulfur dioxide.Sodium sulfite has strong reducibility, and can reduce copper ions to cuprous ions (sulfite can form complexes with cuprous ions and stabilize), and can also reduce weak oxidants such as phosphotungstic acid.Sodium sulfite and its hydrogen salt can be used to remove peroxides of ether substances in the laboratory (add a small amount of water, stir the reaction with mild heat and divide the liquid, the ether layer is dried with quick lime, for some reactions with low requirements).It can be neutralized with hydrogen sulfide.
Part of the reaction equation:
1. The generation:
H2SO3 + Na2CO3 = = = write Na2SO3 + CO2 + H2O
2 nahso3 = = delta = = Na2SO3 + H2O + SO2 write
2. Reducibility:
3 na2so3 hno3 + 2 + 2 = = = = 3 na2so4 no write + H2O
3. The heating:
4 na2so3 = = delta = = Na2S + 3 na2so4
4. Oxidation:
Na2SO3 + 3 h2s = = = = 3 s left + Na2S + 3 h2o [1]
Laboratory preparation
The sodium carbonate solution is heated to 40℃ and saturated with sulfur dioxide, then the same amount of sodium carbonate solution is added, and the solution is crystallized under the condition of avoiding contact with air.

Product details






98 %MIN

96 %MIN













Production Process

1. After melting, clarifying and high-efficiency filtration, the sulfur is added to the sulfur furnace by the sulfur pump.
2. After air is compressed, dried and purified, sulfur furnace is burned and sulfur incinerated to generate SO2 gas (furnace gas).
3. The furnace gas is cooled by the waste pot to recover steam, and then enters the desulfurization reactor. The sublimation sulfur in the gas is removed, and the pure gas with 20.5% SO2 content (volume) is obtained, and then enters the absorption tower.
4, soda with a certain concentration of lye, and sulfur dioxide gas reaction to get sodium bisulfite solution.
5, sodium sulfite hydrogen sodium solution by caustic soda neutralization to get sodium sulfite solution.
6, Sodium sulfite solution into the concentrator, using double effect continuous concentration process.The water is evaporated and a suspension containing sodium sulfite crystals is obtained.
7. Put the concentrator qualified material into the centrifuge to realize solid-liquid separation. The solid (wet sodium sulfite) enters the airflow dryer, and the finished product is dried by hot air.
The mother liquor is recycled to the alkali distribution tank for recycling.

Flowchart of Sodium Sulfite

Sodium Sulfite


1)Used for trace analysis and determination of tellurium and niobium and preparation of developer solution, also used as reducing agent;
2)Used as man-made fiber stabilizer, fabric bleaching agent, photographic developer, dyeing and bleaching deoxidizer, flavor and dye reducing agent, paper lignin remover, etc.
3)Used as a common analytical reagent and photosensitive resistor material;
4)Reductive bleaching agent, which has a bleaching effect on food and a strong inhibition effect on oxidase in plant food.
5)Printing and dyeing industry as a deoxidizer and bleach, used in the cooking of various cotton fabrics, can prevent the local oxidation of cotton fiber and affect the fiber strength, and improve the whiteness of the cooking substance.The photographic industry uses it as a developer.
6) Used by the textile industry as a stabilizer for man-made fibres.
7)The electronics industry is used to make photosensitive resistors.
8)Water treatment industry for electroplating wastewater, drinking water treatment;
9)Used as bleach, preservative, loosening agent and antioxidant in food industry.It is also used in pharmaceutical synthesis and as a reducing agent in the production of dehydrated vegetables.
10)Used for producing cellulose sulfite ester, sodium thiosulfate, organic chemicals, bleached fabrics, etc., also used as reducing agent, preservative, dechlorination agent, etc.;
11) The laboratory is used to prepare sulfur dioxide

Main Export Markets

Asia Africa Australasia
Europe Middle East
North America Central/South America


General packaging specification: 25KG,50KG;500KG;1000KG,1250KG Jumbo Bag;
Packaging Size : Jumbo bag size: 95 * 95 * 125-110 * 110 * 130;
25kg bag size: 50 * 80-55 * 85
Small bag is a double-layer bag,and the outer layer have a coating film ,which can effectively prevent moisture absorption. Jumbo Bag adds UV protection additive,suitable for long distance transportation,as well as in a variety of climated.

Payment & Shipment

Payment Term: TT, LC or by negotiation
Port of Loading : Qingdao Port,China
Lead time : 10-30days after confirming the order

Primary Competitive Advantages

Small Oders Accepted Sample Available
Distributorships Offered Reputation
Price Quality Prompt Shipment
International Approvals Guarantee / Warranty
Country of Origin, CO/Form A/Form E/Form F...

Have more than 10 years professional experience in the production of Sodium Sulfite;
Could customize the packing according to your requirement; Safety factor of jumbo bag is 5:1;
Small trial order is acceptable , free sample is available;
Provide reasonable market analysis and product solutions;

Attention in Use

Risk Overview
Health hazards: to the eyes, skin, mucous membrane irritation.
Environmental hazards: hazards to the environment, can cause pollution to water bodies.
Explosion hazard: the product is non-combustible and irritant.
First aid measures
Skin contact: remove contaminated clothing and rinse with plenty of running water.
Eye contact: Lift eyelids and rinse with running water or saline.Go to a doctor.
Inhalation: away from the scene to fresh air.Give oxygen if you have difficulty breathing.Go to a doctor.
Intake: drink enough warm water to induce vomiting.Go to a doctor.
Fire control measures
Hazardous characteristics: no special combustion and explosion characteristics.High thermal decomposition produces toxic sulphide fumes.
Harmful combustion product: Sulphide.
Fire extinguishing method: fire personnel must wear full body fire - proof clothing, fire fighting in the upwind.When putting out a fire, move the container as far as possible from the fire site to an open area.
Emergency response to leakage
Emergency treatment: isolate the contaminated area of leakage and restrict access.It is recommended that emergency personnel wear dust masks (full cover) and gas suits.Avoid dust, carefully sweep up, put in bags and transfer to a safe place.It can also be washed with plenty of water and diluted into the wastewater system.If there is a large amount of leakage, cover with plastic sheets and canvas.Collect, recycle or transport to waste disposal site for disposal.
Operation disposal and storage
Operation precautions: airtight operation, strengthen ventilation.Operators must be specially trained and strictly follow the operating procedures.Operators are recommended to wear self-suction filter dust masks, wear chemical safety protective glasses, wear anti-toxic permeation overalls, and wear rubber gloves.Avoid dust.Avoid contact with acids.Handle lightly to prevent packing damage.Equipped with leakage emergency treatment equipment.Empty containers may retain harmful substances.
Precautions for storage: Store in a cool, ventilated warehouse.Keep away from fire and heat.Should be separated from acid and other storage, do not mix storage.Do not last long.The storage area shall be provided with suitable materials to hold the leakage.
Contact control/personal protection
Engineering control: the production process is closed, and ventilation is strengthened.
Respiratory system protection: when the dust concentration in the air exceeds the standard, you must wear a self-suction filter dust mask.In case of emergency rescue or evacuation, an air respirator should be worn.
Eye protection: wear chemical safety glasses.
Body protection: wear anti-toxic permeation work clothes.
Hand protection: wear rubber gloves.
Other protection: change work clothes in time.Maintain good hygiene.
Stability and reactivity
Stability: Instability
Prohibited compounds: strong acid, aluminum, magnesium.
Decomposition products: sulfur dioxide and sodium sulfate
Biodegradability: non-biodegradability
Other harmful effects: the substance is harmful to the environment, special attention should be paid to the pollution of water.
Transportation Precautions: The packing should be complete and the loading should be safe.Ensure that the container does not leak, collapse, fall or damage during transportation.It is strictly prohibited to be mixed with acids and edible chemicals.The transportation should be protected against exposure to the sun, rain and high temperature.The vehicle should be thoroughly cleaned after transportation.

  • Sodium Sulfite (1)
  • Sodium Sulfite (2)

  • Previous:
  • Next:

  • Write your message here and send it to us