Sodium Hydrosulfite – Na2S2O4 (Bleaching Agent) | 50kg/Drum

• Product Name: Sodium Hydrosulfite (Na₂S₂O₄)
• Other Names: Sodium Hydrosulfite, Bleaching Agent, Sodium Dithionite, Sodium Hydrosulfide
• Chemical Formula: Na₂S₂O₄
• CAS Number: 7775-14-6
• Origin: Germany, China, Italy – Leading countries in high-quality industrial chemical production.
• Packaging: 50kg/drum – Standard packaging, easy storage, safe transportation, especially suitable for industries requiring sodium hydrosulfite.

What is Sodium Hydrosulfite?

Due to its strong reducing properties, Na₂S₂O₄ is primarily used in the textile dyeing industry to remove excess dye, in water treatment to eliminate residual chlorine and oxidizing impurities, as well as in chemical production. It is also known by other names such as Sodium Dithionite.

Physicochemical Properties of Sodium Hydrosulfite:

Physical Properties of Na2S2O4:

• Form: White crystalline powder, hygroscopic when exposed to air.


• Melting Point: ~65-70°C, decomposes at high temperatures.


• Molecular Weight: 174.11 g/mol.


• Density: 2.38 g/cm³, aiding in identification during storage.


• Solubility in Water: 18.2 g/100ml at 20°C – highly soluble but unstable long-term.

Chemical Properties of Na2S2O4:

• A strong reducing agent, Na₂S₂O₄ can reduce metal oxides and remove color from organic compounds, especially in textile dyeing.


• Sodium Hydrosulfite is unstable in water and air: When exposed to oxygen, it decomposes into Sodium Bisulfite (NaHSO₃) and Sodium Thiosulfate (Na₂S₂O₃).


• Sodium Hydrosulfide has similar properties in certain specialized industrial applications.


• Reaction in Strong Acidic Environments: Reacts vigorously, generating significant heat when combined with HCl.


• Aqueous Sodium Hydrosulfite is stable when heated but slowly oxidizes in air.
  
  
  
  • 2S₂O₄^2- + H₂O → S₂O₃^2- + 2HSO^3–
  
  
  
  


• Aqueous Sodium Dithionite is acidic and decomposes into sodium thiosulfate and sodium bisulfite. Reaction rate increases with temperature or strong acidic environments.
  
  
  
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    • 2Na₂S₂O₄ + H₂O → Na₂S₂O₃ + 2NaHSO₃
    
    
    
    
  
  
  
  


• In the presence of oxygen, it decomposes into sodium bisulfate and sodium bisulfite.
  
  
  
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    • Na₂S₂O₄ + O₂ + H₂O → NaHSO₄ + NaHSO₃
    
    
    
    
  
  
  
  


• In alkaline solutions (pH 9-11), Na₂S₂O₄ is stable and decomposes only about 1% per hour. It has strong reducing properties and decomposes into Na₂CO₃ and Na₂S.
  
  
  
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    • 3Na₂S₂O₄ + 6NaOH → 5Na₂SO₃ + Na₂S + 3H₂O
    
    
    
    
  
  
  
  


• Bleaching Agent undergoes redox reactions with HCl, releasing significant heat.
  
  
  
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    • 2Na₂S₂O₄ + 4HCl → 2H₂S₂O₄ + 4NaCl
    
    
    
    
  
  
  
  

Chemical Formula Na2S2O4

Applications of Sodium Hydrosulfite:

1. Textile Dyeing: As a strong reducing agent, it removes dye oxides, eliminating impurities and brightening fabrics. Thus, it is widely used to strip color from dyes in the textile industry. Additionally, Sodium Hydrosulfide has important applications in this sector.


2. Water Treatment: Na₂S₂O₄ is used to remove oxidizable substances and residual chlorine, ensuring water quality. Sodium Hydrosulfite also improves industrial water treatment processes. See also: Water Treatment Chemicals


3. Bleaching Agent: The strong reducing properties of Na2S2O4 make it a component in certain bleaches, especially in paper production.


4. Laboratory Use: Sodium Hydrosulfide can be used in specialized reduction processes in laboratories to create necessary reaction environments.


5. Chemical Reduction Recovery: It is used to recover oxidized reducing agents in certain applications.


6. Food & Pharmaceutical Industry: Sodium Dithionite is used as an antioxidant and acidity regulator.


7. Reducing Sulfates in Distilled Water & Solvents: It reduces sulfate content in distilled water and laboratory solvents.


8. Laboratory: Used in chemical reactions requiring strong reducing environments.


9. Pharmaceuticals & Food: Acts as a preservative and antioxidant in specific products.

Usage & Storage Notes for Sodium Hydrosulfite:

• Safety Measures: Sodium Dithionite is sensitive to oxygen and must be stored and used in oxygen-free environments. Follow chemical safety protocols when handling.


• Avoid Air Exposure: Na2S2O4 should be kept in oxygen-free environments to prevent unwanted oxidation.


• Avoid Light & High Temperatures: It is unstable and decomposes under light and high temperatures. Store in cool, dark conditions.

Storage Guidelines for Sodium Hydrosulfite:

• Airtight Packaging: Na₂S₂O₄ must be stored in sealed containers to maintain its strong reducing properties.


• Cool Storage: Store in dry, cool places away from high temperatures to prevent decomposition.


• Regular Quality Checks: If discoloration or unusual odors occur, inspect for decomposition or contamination.


• Avoid Cross-Contamination: Keep away from strong oxidizers and incompatible chemicals.


• Proper Handling: Follow manufacturer guidelines and safety protocols when using Na2S2O4 in chemical processes.

Where to Buy Sodium Hydrosulfite:

Sodium Hydrosulfite from Loc Thien Chemicals meets customer requirements with high-quality products, clear origins, and competitive pricing. Our team provides dedicated consultation services.

To purchase Sodium Hydrosulfite, contact our Hotline: 0979.89.1929 or visit website: hoachatlocthien.com. We are always ready to serve you.

Frequently Asked Questions (FAQ) about Sodium Hydrosulfite (Na₂S₂O₄)

1. Is Sodium Hydrosulfite toxic? Does it affect health?
   
   
   
   • Sodium Hydrosulfite (Na₂S₂O₄) is not extremely toxic but can irritate skin, eyes, and the respiratory system with prolonged exposure or inhalation. When exposed to water and air, it may release SO₂ gas, causing respiratory discomfort. Use protective measures like masks, gloves, and goggles. If direct contact occurs, rinse immediately and seek medical advice if irritation persists.
   
   
   
   


2. Can Sodium Hydrosulfite replace other reducing agents in industry?
   
   
   
   • Na₂S₂O₄ is a strong reducing agent widely used in textile dyeing, water treatment, and paper production. However, in some cases, it can be replaced by Sodium Bisulfite (NaHSO₃) or Sodium Thiosulfate (Na₂S₂O₃) depending on specific production requirements. Sodium Hydrosulfite remains preferred due to its strong reducing efficiency, fast reaction, and cost-effectiveness.
   
   
   
   


3. Can Sodium Hydrosulfite be used in the food industry?
   
   
   
   • Although Sodium Hydrosulfite is a strong reducing agent used in various industries, it is not widely used in food. Some countries may permit minimal usage as an antioxidant or preservative. However, since it decomposes into SO₂ gas, which may negatively impact health, check specific national regulations before food industry use.
   
   
   
   


4. Is Sodium Hydrosulfite compatible with other chemicals? Are there hazardous reactions to note?
   
   
   
   • Sodium Hydrosulfite reacts strongly with oxidizers like chlorine, nitric acid, and hydrogen peroxide. When combined with strong acids like HCl, it generates heat and toxic SO₂ gas. Additionally, exposure to air or moisture causes decomposition, releasing irritating sulfur compounds. Avoid mixing with incompatible chemicals and store in dry, airtight conditions to prevent unwanted reactions.
   
   
   
   


5. How to safely handle Sodium Hydrosulfite spills or leaks?
   
   
   
   • In case of spills, ensure proper ventilation to avoid inhaling reaction gases. Use dry absorbents like sand or lime powder to collect spilled material. Avoid direct water application as it accelerates decomposition and SO₂ release. Finally, collect the chemical in specialized containers for hazardous industrial waste disposal.