Sodium Sulfite
- CAS Number: 7757-83-7
- Chemical Formula: Na2SO3
- MOQ: 1000KG
- Shelf Life: 2 years
- Forms: Powder
- Synonyms: Sodium sulfite anhydrous, Sodium sulfite, Disodium sulfite
Product Description
What Is Sodium Sulfite?
Sodium Sulfite (Na2SO3) is a key chemical primarily utilized as a reducing agent in numerous industrial applications. It plays a crucial role in chemical manufacturing, particularly in the production of dyes, pharmaceuticals, and within the petrochemical industry. Sodium Sulfite is also used in the treatment of water to remove chlorine and in the paper industry for bleaching pulp.
Preparation Method:
Sodium Sulfite is generally manufactured by reacting sulfur dioxide (SO2) with sodium hydroxide (NaOH), or through the reduction of sodium sulfate (Na2SO4) with carbon. These production methods are commonly employed in industrial settings.
Related Parameters:
| Items | Standards |
| Na2SO3 content | 98.0 %min |
| Sodium sulphate | 1.5%max |
| Iron (Fe) | 0.003%max |
| Water insoluble | 0.02%max |
| Free alkali (as Na2CO3) | 0.30%max |
| As | 0.0002%max |
| HEAVY METAL(as Pb) | 0.001%max |
Recommended Dosage of Sodium Sulfite:
| Applications | Dosage |
| Water Treatment | 0.1% – 1% |
| Paper and Pulp Industry | 1% – 5% |
| Chemical Manufacturing | 1% – 10% |
| Food and Beverage | 0.1% – 0.3% |
| Photography | 1% – 5% |
| Textile Industry | 1% – 3% |
Sodium Sulfite Has Wide Range of Uses:
Sodium Sulfite (Na2SO3) is a versatile chemical used in various industries:
- Water Treatment: Used as an oxygen scavenger in water systems, preventing corrosion in boilers and cooling towers.
- Paper and Pulp Industry: Acts as a reducing agent in the bleaching process and in the preparation of wood pulp.
- Chemical Manufacturing: Used in the production of sodium bisulfite, sodium metabisulfite, and other chemicals.
- Preservatives and antioxidants are roles it plays in food processing, with a particular focus on dried fruits and vegetables.
- Photography: Used in photographic development to remove excess silver halide from exposed film.
Within the textile industry, it finds application in processes like dyeing and the finishing of fabrics, contributing to the enhancement of material quality and appearance.
Its strong reducing properties make it valuable across these diverse applications.
User Asked Question:
Q: What grades of Sodium Sulfite do you offer?
A: We provide two main grades of Sodium Sulfite: industrial-grade and food-grade. The industrial-grade variant is primarily used in applications like water treatment, paper manufacturing, and chemical processes. On the other hand, the food-grade Sodium Sulfite is specially formulated for the food industry, where it serves as a preservative and antioxidant in different food products.
