Sodium Sulfite Bleaching - Sodium Sulfite – TOPTION

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

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:
SO2+2NaOH===Na2SO3+H2O
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
2Na2SO3+O2====2Na2SO4
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

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

Applications

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

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