【CAS】7757-83-7
Alias: Benzoic acid, sodium salt, Antimol.
Molecular formula: Na2SO3 Relative molecular mass: 126.043
Structural formula:
1.Product Property
Sodium sulfite is an inorganic substance with the chemical formula Na2SO3. It is the sulfite salt of sodium. It is mainly used as a stabilizer for artificial fibers, a bleaching agent for fabrics, a developer for photography, a deoxidizer for dyeing and bleaching, a reducing agent for fragrances and dyes, and a wood-degrading agent for papermaking.
2.
| Parameter | Industrial Grade | Food Grade |
| Purity (Na₂SO₃) | ≥96.0% | ≥97.0% |
| Iron (Fe) | ≤0.005% | ≤0.002% |
| Water Insolubles | ≤0.05% | ≤0.02% |
| Heavy Metals (Pb) | ≤10 ppm | ≤5 ppm |
| Selenium (Se) | ≤0.003% | ≤0.001% |
| pH (10% solution) | 9.0–10.5 | 9.0–10.0 |
3.Application scope and Usage
It is mainly used as a stabilizer for artificial fibers, a fabric bleaching agent, a photographic developer, a dye bleaching decolorizer, a flavoring agent and a dye reducing agent, and a lignin removal agent for papermaking.
4.Package and Storage
Anhydrous sodium sulfite is packaged in 25kg inner PE film-coated kraft paper bags or plastic woven bags. For food-grade products, double-layer moisture-proof measures are required. It should be stored in a cool and dry warehouse (<30℃), sealed tightly to prevent moisture and air (it is prone to oxidation), and kept away from acids and oxidants. During operation, ensure good ventilation (as decomposition produces SO₂). The shelf life is 24 months.
