Zhishang Chemical

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Zhishang Chemical

Sodium Metabisulfite CAS 7681-57-4

Molecular Formula: 2Na.O5S2

Formula Weight: 190.11

ZSpharmac: Sodium Metabisulfite Supplier

Product Name: Sodium Metabisulfite
CAS No: 7681-57-4
Purity: 99%

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Basic Info

Product Name:Sodium Metabisulfite
Other Names:SodiuM Metabisulfite, 97%
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:White to Slightly Yellow Powder
EINECS No.:231-673-0
Storage:Store at +5°C to +30°C.
Provide:Sodium Metabisulfite MSDS;
Sodium Metabisulfite COA

What is Sodium Metabisulfite?

Sodium Metabisulfite is white or yellow crystalline powder or little crystals with a strong SO2 scent. It will be oxidized to Na2S2O6 when put airborne for a long period of time, so this product can not be used. long-lived.

Sodium Metabisulfite Property

Melting point >300 °C (lit.)
density 1.48
storage temp. Store at +5°C to +30°C.
solubility 540 g/L (20°C)
form Powder/Solid
color White to slightly yellow
Specific Gravity1.48
PH Range4.5 at 50 g/l at 20 °C
PH3.5-5 (50g/l, H2O, 20℃)
Water Solubility 540 g/L (20 ºC)


Sodium Metabisulfite Uses

  1. Salt Metabisulfite is made use of as a chromatographic reagent, preservative as well as lowering representative in the dye and also pharmaceutical markets.
  2. Salt Metabisulfite is made use of as bleaching agent, mordant, reducing agent, rubber coagulant, as well as also used in organic synthesis, pharmaceuticals and spices, etc.
  3. Sodium Metabisulfite is utilized in the pharmaceutical market to create chloroform, phenylpropansulfone as well as benzaldehyde. The rubber industry is made use of as a coagulant.In the tanning market, it is utilized for leather therapy, which can make the natural leather soft, plump, tough, waterproof, anti-folding, and wear-resistant. In the chemical industry, it is used to create hydroxyvanillin, hydroxylamine hydrochloride, and so on. The photosensitive market is utilized as a programmer, etc.
  4. Sodium Metabisulfite can be used in sweet fruit, biscuits, sugar, rock sugar, caramel, sweet, glucose, fluid sugar, bamboo shoots, mushrooms and also canned mushrooms, with an optimum dosage of 0.45 g/kg. The deposits of sweet fruit, bamboo shoots, mushrooms and also tinned mushrooms, grapes and black currant juice concentrate (calculated as SO2) are less than 0.05/ kg; the deposits of biscuits, sugar, vermicelli as well as various other ranges are less than 0.1 g/kg; the deposits of fluid sugar No more than 0.2 g/kg.
  5. Sodium Metabisulfite is made use of as whitening representative, preservative, loosening representative, antioxidant, color-protecting agent as well as fresh-keeping representative in the food industry.
  6. Salt Metabisulfite is used in printing and dyeing, natural synthesis, printing, tanning, pharmaceutical and also other departments in industry; it is used as preservative, lightening representative as well as loosening up representative in food handling.

Precautions for use of Sodium Metabisulfite

Using salt metabisulfite in processed foods must remember of the following points:
1) Salt metabisulfite is a reductive lightening representative, and its solution is unpredictable along with unsteady, so it requires to be prepared and additionally used as soon as possible to prevent the sulfite from being uncertain and likewise volatilizing.

2) When there are steel ions in the food, the recurring sulfurous acid can be oxidized; it can also oxidize and also change the shade of the minimized pigment, consequently reducing the effectiveness of the bleach. As a result, steel chelating representatives are made use of at the same time in production.

3) Materials blonde with sulfites are simple to recolor as a result of the disappearance of sulfur dioxide, so normally excess sulfur dioxide stays in food, yet the reoccuring quantity needs to not surpass the requirement.

4) Sulfurous acid can not hinder the job of pectinase, and also will harm the cohesion of pectin. Additionally, after the sulfurous acid passes through right into the fruit cells, the sulfur dioxide can just be eliminated by crushing the fruit throughout handling. For that reason, the fruit kept with sulfurous acid is only ideal for making jam, dried out fruit, fruit red wine, sweet fruit, and so forth, along with can not be used as a sources for canning.

5) Sulfite can ruin thiamine, so it is hard to utilize in fish food.

6) Sulfite is very easy to respond with aldehydes, ketones, healthy and balanced proteins, and more.

Sodium Metabisulfite Specific Embodiments

The technological solutions in the embodiments of the here and now innovation will certainly be clearly as well as entirely described below combined with the going along with illustrations in the personifications of today invention. Obviously, the defined personifications are only some of the personifications of today creation, not every one of them. Based on the personifications of today development, all other embodiments gotten by persons of common ability in the art without making innovative efforts belong to the defense extent of today development.

Synthetic route map of sodium metabisulfite


Please refer to Fig. 1, in the embodiment of the present invention, a kind of production technique of sodium pyrosulfite adopts batch mode of operation to carry out, and its process step is as follows: (1) SO Synthesis: in SO In the furnace, air reacts with fluidized sulfur powder Generate SO2 high-temperature gas, also generate a small amount of SO3 and sulfur vapour, SO2 content is 15~16% in the mixed gas, and the pressure during normal work in the SO2 generating furnace is 0.85Kgf; (2) washing purification: SO2 mixed gas Feed into clear water for washing, remove SO in the mixed gas and sulfur vapor and reduce the temperature of the mixed gas to produce sulfuric acid waste water with a pH value of 1 to 2; (3) sodium metabisulfite synthesis: the washed gas is passed into the synthesis kettle Three-stage series absorption is carried out. The absorption liquid is Na2CO3 solution. SO2 reacts with Na2CO3 in the solution to form sodium metabisulfite and CO2. During the absorption process, stir continuously with a stirrer to strengthen material mixing. The absorption rate of each stage is 97%. After absorption The concentration of SO2 in the tail gas is 11.55mg/m3, and the exhaust gas after the three-stage series absorption mainly contains CO2 and N2, which is discharged into the atmosphere through an exhaust pipe with a diameter of 0.2m and a height of 15m; (4) Centrifugal Drying: Centrifuge the absorbed mixed solution, return the centrifuged mother liquor to the reactor for further use, and use the indirect hot air from the SO2 generator for countercurrent drying of the centrifuged solid; (5) Recovery and circulation: after drying The hot air enters the cyclone separator to separate and recover sodium pyrosulfite particles. A very small amount of fine sodium pyrosulfite particles enters the swirling plate tower with hot air for washing and dust removal. Since sodium pyrosulfite powder is very soluble in water, the concentration of sodium pyrosulfite dust in the discharged dry exhaust gas is guaranteed. Below 120mg/m3, the concentration of SO2 drops below 850mg/m3, the temperature of the exhaust gas after dust removal is 60°C, and the exhaust gas is discharged into the atmosphere through an exhaust pipe with an inner diameter of 0.325m and a height of 15m, and the swirl plate The dedusting solution of the tower is Na2CO3 solution, and the dedusting waste liquid is recycled for many times and then returned to the reactor to be recycled as mother liquor.

Sulfur powder burns in the SO2 generator and releases a lot of heat, cooling with air, on the one hand, helps to reduce the temperature of the furnace wall and prolong the service life of the furnace body, on the other hand, the heated air is used for drying of sodium pyrosulfite.

About Products:
If you need Sodium Metabisulfite as a cosmetic raw material, please contact our service staff directly, we will provide you with high-quality products at the best price.
As an experienced Sodium Metabisulfite manufacturer and supplier, ZSpharmac will provide Sodium Metabisulfite raw materials to customers all over the world for a long time.
Over the years, the company has been adhering to the spirit of “integrity management, strict quality control, customer first”, and has won unanimous praise from domestic and foreign customers.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Cosmetic raw materials
  • Products/Service:Cosmetic raw materials (flavors and fragrances,antioxidant products, moisturizing and hydrating, whitening agents, cosmetic additives)
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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