Sodium Sulfite is an inorganic compound with the chemical formula Na₂SO₃. It is a white, crystalline powder or granule with good solubility in water. It is a versatile reducing agent and preservative, known for its ability to scavenge oxygen, which makes it invaluable in numerous industrial processes. Commercially, it is often encountered in its anhydrous form or as a heptahydrate (Na₂SO₃·7H₂O).
Key Properties
Chemical Formula: Na₂SO₃
Molar Mass: 126.043 g/mol (Anhydrous)
Appearance: White crystalline solid
Odor: Odorless
Solubility: Highly soluble in water
Main Feature: Strong reducing agent, antioxidant.
| Industry/Field | Primary Use | Description |
|---|---|---|
| Pulp & Paper | Delignifying Agent | Used in the kraft process to break down lignin in wood pulp, separating cellulose fibers for paper production. This is its largest-scale application. |
| Water Treatment | Oxygen Scavenger | Removes dissolved oxygen from boiler feedwater in power plants and industrial systems to prevent corrosion and scaling. |
| Photography | Developing Agent | Used in photographic developers to reduce silver halides to metallic silver, forming the photographic image. |
| Food & Beverage | Preservative & Antioxidant (E221) | Prevents browning and discoloration in dried fruits, canned goods, and wines. It inhibits microbial growth and prevents spoilage. |
| Textile | Bleaching Agent & Chlorine Remover | Used as a bleaching agent for fabrics and to remove excess chlorine after chlorine bleaching (antichlor). |
| Chemical Manufacturing | Intermediate & Reducing Agent | Serves as a raw material or reducing agent in the production of other chemicals, such as sodium thiosulfate. |
| Pharmaceuticals | Antioxidant | Used in some medications to prevent oxidation and maintain product stability and potency. |
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Safety and Handling
Sodium sulfite is generally stable but should be stored in a cool, dry, and well-ventilated area in tightly closed containers to prevent oxidation to sulfate. It can decompose upon heating or contact with acid, producing sulfur dioxide (SO₂) gas, which is a respiratory irritant. Appropriate personal protective equipment (PPE) like gloves and safety glasses is recommended during handling.
| Aspect | Details & Trends |
|---|---|
| Global Production | Major producers are located in China, North America, and Europe. Production is often integrated with other chemical manufacturing processes, such as the production of sulfur dioxide or cellulose. |
| Key Market Drivers | 1. Demand from Pulp & Paper Industry 2. Stringent Water Treatment Regulations (driving need for corrosion inhibitors) 3. Growth in Food Processing Sector |
| Trade Dynamics | It is traded globally as a bulk chemical. Anhydrous sodium sulfite is more common for international trade due to its higher stability and lower shipping cost compared to the hydrated form. |
| Price Factors | Prices are influenced by the cost of raw materials (soda ash and sulfur dioxide), energy costs, transportation logistics, and regional supply-demand balance. |
| Regulations |
Trade and use, especially in food and pharmaceuticals, are subject to strict regulations (e.g., FDA in USA, EFSA in Europe) which specify purity and allowable concentrations. |
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