Sodium sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. It is a yellow solid soluble in water and is used industrially mainly as an antioxidant and preservative. It is produced industrially by-passing sulfur dioxide through caustic soda, and at the end of the process, sodium sulfite crystals are formed. The processing of this product allows sodium sulfite to be produced in both food and industrial grades.
Technical Characteristics
| Chemical Formula | Na2SO3 |
| Other names | Hypo Clear, E221 Sodium sulphite |
| CAS Number | 7757-83-7 |
| Molar mass | 126.043 g/mol |
| Melting Point | 500 °C (anhydrous) |
| Boiling Point: | Decomposes |
| Appearance | Odorless white solid |
Applications
– Water and wastewater treatment
– Oil extraction operations
– Leather industries
– Mining industries
– Food industries
– Photographic industry
– Pulp & Paper industry
– Textile industry
– Chlor-alkali industry
– Detergent industries
– Rubber industry
– Military industries
Environmental impact of Sodium Sulfite
Sodium sulfite can have negative effects on aquatic life if released into the environment in large quantities. It can deplete water oxygen levels, which is harmful to fish and aquatic life. In addition, it may contribute to the formation of acidic compounds that affect soil and water quality. Proper disposal and control of sodium sulfite discharges are essential to prevent contamination of natural water sources and ecosystems.
Safety Measures and Regulations for Handling Sodium Sulfite
When working with sodium sulfite, personal protective equipment such as gloves, safety glasses, and protective clothing are required to prevent direct contact with skin and eyes. This chemical should be stored in a cool, dry place away from incompatible materials such as acids and oxidizers. In the event of a spill, appropriate cleanup procedures should be used and waste should be disposed of in accordance with local regulations. Sodium sulfite should also be handled in well-ventilated areas to reduce inhalation hazards.
Packing
This chemical is available in 25 kg double-layer polyethylene bags.