Anhydrous Sodium Sulfite
Anhydrous Sodium Sulfite is a highly versatile chemical compound widely used in various industrial applications. Our premium-grade Anhydrous Sodium Sulfite meets the strictest quality standards, ensuring optimal performance across multiple industries.
Product Specifications
- Chemical Formula: Na2SO3
- Molecular Weight: 126.04 g/mol
- Appearance: White crystalline powder
- Purity: ≥96%, ≥97%, ≥98% (various grades available)
- Bulk Density: 1.2-1.4 g/cm3
- Solubility: 270 g/L at 20°C (68°F)
- pH (1% solution): 8.5-10.5
- Stability: Stable under normal conditions
- Shelf Life: 24 months when properly stored
| Parameter | Standard Value | Test Method |
|---|---|---|
| Assay (Na2SO3) | ≥96% min | GB/T 9009-2011 |
| Iron (Fe) content | ≤0.002% max | GB/T 3049-2006 |
| Water insoluble matter | ≤0.02% max | GB/T 9738-2008 |
| Free alkali (as NaOH) | ≤0.6% max | GB/T 4348.1-2013 |
| Sulfate (as Na2SO4) | ≤2.5% max | GB/T 636-2011 |
| Heavy metals (as Pb) | ≤0.001% max | GB/T 5009.74-2014 |
Anhydrous Sodium Sulfite FAQ
What is the difference between Anhydrous Sodium Sulfite and Sodium Sulfite Heptahydrate?
The key difference lies in their water content. Anhydrous Sodium Sulfite (Na2SO3) contains no water molecules, while Sodium Sulfite Heptahydrate (Na2SO3·7H2O) contains seven water molecules per formula unit. The anhydrous form has higher purity (96-98% vs 44-48% for heptahydrate) and better stability, making it preferred for many industrial applications where precise dosing is required.
How should Anhydrous Sodium Sulfite be stored?
Anhydrous Sodium Sulfite should be stored in a cool, dry, well-ventilated area away from moisture, heat, and incompatible materials like strong acids or oxidizers. Keep containers tightly sealed when not in use. Ideal storage temperature is between 15-25°C (59-77°F). The product should be protected from direct sunlight and humidity to prevent caking or deterioration.
Packaging Options
- 25 kg multi-layer paper bags with PE liner
- 50 lb fiber drums with plastic liners
- 1000 kg bulk bags (FIBCs) with inner lining
- Custom packaging available upon request
Key Applications
| Industry | Application |
|---|---|
| Pulp & Paper | Delignification, bleaching agent, oxygen scavenger |
| Water Treatment | Dechlorination agent, oxygen scavenger in boiler water |
| Food Industry | Preservative (E221), antioxidant, dough conditioner |
| Photography | Developing agent, fixing bath component |
| Textile | Bleaching agent, chlorine neutralizer |
| Chemical Manufacturing | Reducing agent, intermediate in various syntheses |
Is Anhydrous Sodium Sulfite safe for food applications?
Food-grade Anhydrous Sodium Sulfite (E221) is generally recognized as safe (GRAS) when used in accordance with good manufacturing practices. The FDA and EFSA have approved its use as a preservative and antioxidant in various food products at specified maximum levels (typically 10-1000 ppm depending on application). However, it must be declared on labels as it can cause allergic reactions in sulfite-sensitive individuals, particularly asthmatics.
Safety Information
- Hazard Classification: Irritant (Skin, Eye, Respiratory)
- Personal Protection: Gloves, goggles, dust mask
- First Aid Measures: Flush eyes/skin with water if exposed
- Fire Fighting: Use water spray, CO2, dry chemical
- Spill Procedure: Contain and collect, avoid dust formation
- Disposal: According to local regulations