Sulfur dioxide

Sulfur dioxide is a toxic gas with the chemical formula SO₂ and CAS number 7446-09-5. This compound has a molecular weight of 64.07 g/mol and is classified as a pressurized gas with acute toxicity. It's characterized by its pungent, irritating odor and is considered highly dangerous due to its corrosive properties and ability to cause severe respiratory damage upon inhalation.

Sulfur dioxide is a colorless gas at room temperature with a characteristic sharp, suffocating odor. It's highly soluble in water, forming sulfurous acid, and can be liquefied under pressure. The gas is heavier than air with a density of approximately 2.6 kg/m³. It's non-flammable but supports combustion and can react violently with certain materials, particularly bases and oxidizing agents.

Sulfur dioxide serves primarily as a preservative in food and beverage industries, particularly in wine production. It's extensively used in chemical manufacturing for producing sulfuric acid, sulfites, and other sulfur compounds. Additional applications include bleaching of textiles and paper, fumigation processes, and as a reducing agent in various industrial processes. It's also used in metal refining and as a refrigerant.

Sulfur dioxide requires strict safety protocols including full respiratory protection with supplied air systems and chemical-resistant protective clothing. Work must be conducted in well-ventilated areas or under fume extraction systems. Avoid skin and eye contact completely, as it causes severe chemical burns. Emergency eyewash stations and safety showers must be immediately accessible. Only trained personnel should handle this substance.

Sulfur dioxide must be stored in pressurized containers in cool, dry, well-ventilated areas away from heat sources and direct sunlight. Keep containers upright and secure to prevent falling. Store separately from incompatible materials including strong bases, oxidizing agents, and reactive metals. Storage areas should have appropriate gas detection systems and emergency ventilation. Regular container inspection is essential.

Immediate evacuation from the exposure area to fresh air is critical for inhalation exposure. Remove contaminated clothing and flush affected skin with copious amounts of water for at least 15 minutes. For eye contact, rinse immediately with clean water for 15-20 minutes. Seek immediate medical attention for all exposures. Do not induce vomiting if ingested. Provide oxygen if breathing is difficult.

Sulfur dioxide disposal must comply with local environmental regulations as hazardous waste. Small quantities can be neutralized by bubbling through sodium hydroxide solution under controlled conditions. Larger quantities require professional hazardous waste disposal services. Never release directly into the environment. Empty containers must be properly decontaminated and disposed of through authorized waste management facilities following applicable waste codes.

Sulfur dioxide is classified under ADR Class 2 (gases) for transport purposes. It must be shipped in approved pressure vessels with proper hazard labels and documentation. Transport vehicles require appropriate placarding and emergency response information. Only authorized carriers with proper training and equipment should handle transportation. Special permits may be required for certain quantities or routes.

Sulfur dioxide is strictly regulated under CLP classification as Acute Tox. 3, STOT SE 1, and Skin Corr. 1B with 'Danger' signal word. It falls under REACH registration requirements but is not classified as an SVHC substance. Industrial use is subject to emission limits and workplace exposure controls. Food industry applications have specific maximum residue limits regulated by food safety authorities.

Sulfur dioxide is available through OYSI, a specialized European distributor of technical chemicals. As a professional chemical supplier, OYSI provides sulfur dioxide with proper documentation, safety data sheets, and regulatory compliance support. Due to its hazardous nature, purchases typically require business credentials and proof of proper handling capabilities. Contact OYSI directly for availability, specifications, and technical support.