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Sodium Sulfite Anhydrous High Purity Dechlorination Bleaching Agent Deoxidizer 7757 83 7
Product Summary
Sodium Sulfite Anhydrous (Disodium Sulfite), Purity≥97%, Dechlorination/Bleaching Agent, Deoxidizer CAS 7757-83-7 Product Overview Sodium Sulfite Anhydrous (CAS 7757-83-7), commonly referred to as disodium sulfite, is a high-purity, industrial-grade reducing agent and oxygen scavenger supplied as a ...
Basic Properties
Place of Origin:
CHINA
Brand Name:
QINGJIANG CHEMICAL
Certification:
ISO 14001, ISO 50001, ISO 45001, ISO 9001
Model Number:
Industrial Grade
Trading Properties
Minimum Order Quantity:
1KG
Price:
Inquiry
Payment Terms:
T/T,L/C
Product Description
Sodium Sulfite Anhydrous (Disodium Sulfite), Purity≥97%, Dechlorination/Bleaching Agent, Deoxidizer CAS 7757-83-7
Product Overview
Sodium Sulfite Anhydrous (CAS 7757-83-7), commonly referred to as disodium sulfite, is a high-purity, industrial-grade reducing agent and oxygen scavenger supplied as a white crystalline powder with a minimum assay of 97%. It is widely employed in water treatment for rapid dechlorination, in boiler systems for effective oxygen removal, and in the pulp and paper industry as a cooking aid and bleach neutralizer. Its strong reducing properties, excellent water solubility, and cost-effectiveness make it an essential process chemical for municipal water plants, power generation facilities, textile mills, and photographic processing operations around the world.
Key Features
- Efficient Dechlorination: Neutralizes free chlorine and chloramines almost instantaneously, preventing oxidative damage to downstream equipment and processes
- Powerful Oxygen Scavenger: Reacts readily with dissolved oxygen, making it an ideal choice for boiler feedwater conditioning and oilfield water injection to inhibit pitting and corrosion
- High Purity Industrial Grade: A minimum 97% Na₂SO₃ content guarantees reliable reducing capacity, consistent reaction stoichiometry, and controlled levels of insolubles for trouble-free application
- Free-Flowing White Powder: Easily handled, accurately weighed, and rapidly dissolved in water to prepare process solutions on-site, without generating harmful fumes
- Multi-Purpose Reducing Agent: Beyond dechlorination, it functions as a preservative, developing agent, and sulfur source in various chemical, textile, and food-related applications
Main Functions and Applications
Water and Wastewater Dechlorination
Sodium sulfite is the most widely used chemical for removing chlorine and chloramines from municipal water supplies, industrial process water, and wastewater effluent before discharge. It prevents chlorine toxicity to aquatic life and protects reverse osmosis membranes and ion exchange resins from oxidative degradation.
Sodium sulfite is the most widely used chemical for removing chlorine and chloramines from municipal water supplies, industrial process water, and wastewater effluent before discharge. It prevents chlorine toxicity to aquatic life and protects reverse osmosis membranes and ion exchange resins from oxidative degradation.
Boiler Water Treatment and Oxygen Control
In steam-generating systems, anhydrous sodium sulfite serves as an economic oxygen scavenger. It is added to boiler feedwater to eliminate residual dissolved oxygen, thereby preventing oxygen pitting and corrosion in boilers, condensate lines, and heat exchangers, extending equipment life and reducing maintenance costs.
In steam-generating systems, anhydrous sodium sulfite serves as an economic oxygen scavenger. It is added to boiler feedwater to eliminate residual dissolved oxygen, thereby preventing oxygen pitting and corrosion in boilers, condensate lines, and heat exchangers, extending equipment life and reducing maintenance costs.
Pulp and Paper Processing
The product is used as a cooking liquor component in semichemical pulping and as a bleaching assistant. It stabilizes bleaching baths, neutralizes residual chlorine after oxidative bleaching stages, and helps maintain consistent pulp brightness without fiber degradation.
The product is used as a cooking liquor component in semichemical pulping and as a bleaching assistant. It stabilizes bleaching baths, neutralizes residual chlorine after oxidative bleaching stages, and helps maintain consistent pulp brightness without fiber degradation.
Textile, Photography, and Chemical Synthesis
In the textile industry, sodium sulfite acts as a reducing agent in dyeing and bleaching processes, and as a dechlorinating agent for fabrics. In photography, it is a key antioxidant in developer solutions, protecting developing agents from aerial oxidation and extending bath life. It is also employed as a sulfonating agent and as a starting material for manufacturing thiosulfates, hydrosulfite, and other sulfur-containing compounds.
In the textile industry, sodium sulfite acts as a reducing agent in dyeing and bleaching processes, and as a dechlorinating agent for fabrics. In photography, it is a key antioxidant in developer solutions, protecting developing agents from aerial oxidation and extending bath life. It is also employed as a sulfonating agent and as a starting material for manufacturing thiosulfates, hydrosulfite, and other sulfur-containing compounds.
Technical Specifications
| Property | Value |
|---|---|
| Molecular Formula | Na₂SO₃ |
| Molecular Weight | 126.04 g/mol |
| Appearance | White crystalline powder |
| Purity (as Na₂SO₃) | ≥97.0% |
| Sodium Sulfate (Na₂SO₄) | ≤2.5% |
| Water Insoluble Matter | ≤0.05% |
| Chloride (Cl) | ≤0.1% |
| Heavy Metals (as Pb) | ≤0.002% |
| Iron (Fe) | ≤0.005% |
| pH (5% aqueous solution) | 8.5–10.0 |
Competitive Advantages
- Rapid and Complete Reaction: Our sodium sulfite dissolves and reacts quickly, reducing chlorine and oxygen with stoichiometric precision, which minimizes chemical overfeed and ensures compliance with discharge limits
- Cost-Effective Performance: The 97% purity provides an optimal balance between price and performance, delivering maximum reducing power per unit cost for high-volume applications in water and boiler treatment
- Consistent Quality Control: Every batch is rigorously tested for sulfite content, insolubles, and key impurities, and is supplied with a Certificate of Analysis, ensuring predictable results and safe integration into your existing processes
- Safe and Moisture-Protected Packaging: Packed in heavy-duty, air-tight polyethylene bags, the product is shielded from humidity and air oxidation during transit and storage, preserving its active content until the point of use
- Technical and Logistics Support: We offer comprehensive documentation (MSDS, COA, commercial invoice) and professional guidance on dosing and handling. Our experienced logistics team ensures timely delivery, whether for single pallets or full container loads, worldwide
Product Details
Highlight:
7757 83 7 Sodium Sulfite Anhydrous
,High Purity Dechlorination Bleaching Agent
,Sodium Sulfite Anhydrous Crystalline Powder
Features:
Efficient Dechlorination, Oxygen Scavenger
Purity:
97%
Appearance:
White Crystalline Powder
Application:
Primarily Used As A Reducing Agent, Bleaching Agent, Preservative, And Deoxidizer, It Is Widely Applied In Various Fields Such As Textiles, Paper-making, Food, And Chemical Industries
CAS:
7757-83-7
Molecular Formula:
Na₂SO₃
Grade:
Industrial Grade
Solubility:
Freely Soluble In Water
Purity:
≥97%
Application:
Dechlorination, Water Treatment, Textiles, Paper
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