Sodium chlorite UN1496 plays a vital role in many industrial processes. This powerful oxidising compound belongs to hazard class 5.1 and requires specific handling procedures during transport and storage to ensure safety.
This chemical compound is widely used in water treatment, textile manufacturing, and paper production. Its classification under UN dangerous goods regulations means it must be packaged in packing group II containers and labelled with appropriate hazard symbols.
The transport category 2 classification means sodium chlorite faces certain carriage restrictions. Bulk transport is not permitted, and specific documentation must accompany all shipments to comply with international safety standards.
Key Takeaways
- Sodium chlorite requires strict handling protocols as a class 5.1 oxidising substance
- Proper packaging and labelling are essential for safe transport and storage
- Special documentation and transport restrictions apply to all shipments
Chemical Properties and Production
Sodium chlorite exists as white crystals with specific chemical characteristics and manufacturing methods. It is produced through chemical reactions involving chlorine dioxide and requires careful handling due to its strong oxidising properties.
Chemical Structure
Sodium chlorite (NaClO2) is an inorganic compound with a molar mass of 90.44 g/mol. The compound features a sodium cation (Na+) paired with a chlorite anion (ClO2-).
The crystals decompose at 200°C, releasing oxygen and toxic gases. Its strong oxidising properties make it highly reactive with organic materials.
In water, sodium chlorite forms a clear solution with a slight chlorine-like odour. The compound maintains stability when stored properly in cool, dry conditions.
Synthesis and Manufacturing
The primary manufacturing method involves electrolysis of sodium chlorate in a sulphuric acid solution. This process creates chlorine dioxide gas as an intermediate product.
The reaction requires precise control of:
- Temperature
- Concentration of reactants
- Gas flow rates
- pH levels
Manufacturers use specialised equipment to handle the volatile chlorine dioxide gas safely. The gas reacts with additional chemicals to form the final sodium chlorite product.
The process must occur in facilities with proper safety measures due to the reactive nature of the compounds involved.
Safety and Handling
Sodium chlorite requires strict safety protocols due to its powerful oxidising properties. Proper storage, handling and transport procedures protect workers and prevent dangerous chemical reactions.
Health Risks
Direct contact with sodium chlorite can cause severe skin burns and eye damage. The chemical irritates the respiratory system when inhaled, potentially causing nosebleeds and throat pain.
Workers must wear proper protective equipment:
- Chemical-resistant gloves
- Safety goggles
- Face shield
- Protective clothing
- Respiratory protection when needed
Acute toxicity through ingestion is serious, with an LD50 of 165 mg/kg in rats. Immediate medical attention is required if swallowed.
Safe Storage Guidelines
Store sodium chlorite in a cool, dry area away from direct sunlight and heat sources. The storage area must be well-ventilated and separate from incompatible materials.
Critical storage requirements:
- Keep containers tightly sealed
- Store away from acids and reducing agents
- Maintain storage temperature below 25°C
- Use corrosion-resistant containers
- Install proper ventilation systems
Regular container inspections help detect leaks or damage early.
Transportation Regulations
UN1496 sodium chlorite is classified as Class 5.1 oxidising substance, Packing Group II. Transport vehicles must display proper hazard placards.
Required transport practices:
- Use UN-approved packaging
- Secure loads properly
- Keep shipping documents accessible
- Train drivers in hazmat procedures
- Follow route restrictions
Special loading provisions apply, including segregation from incompatible materials and bulk transport restrictions.