Thionyl dichloride

Thionyl dichloride is an inorganic chemical compound with the molecular formula Cl2OS and CAS number 7719-09-7. This substance has a molecular weight of 118.97 g/mol and belongs to the class of sulfur oxychlorides. It is classified as a corrosive substance with acute toxicity properties, requiring careful handling due to its hazardous nature and reactivity with water and organic materials.

Thionyl dichloride is a colorless to pale yellow liquid at room temperature with a pungent, acrid odor. It has a boiling point of approximately 79°C and a density of about 1.64 g/cm³. The compound is highly reactive with water, decomposing to form sulfur dioxide and hydrogen chloride gases. It is miscible with many organic solvents but reacts violently with alcohols and water.

Thionyl dichloride is primarily used as a chlorinating agent in organic synthesis, converting alcohols to alkyl chlorides and carboxylic acids to acyl chlorides. It serves as an important reagent in pharmaceutical manufacturing, pesticide production, and the synthesis of various organic compounds. The substance is also utilized in the preparation of lithium thionyl chloride batteries and as a dehydrating agent in chemical processes.

Thionyl dichloride must be handled with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Work should be conducted in a well-ventilated area or under a fume hood to avoid inhalation of vapors. Due to its corrosive nature (Skin Corr. 1A) and acute toxicity (Acute Tox. 4), avoid direct contact with skin and eyes, and prevent vapor inhalation.

Thionyl dichloride should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from moisture and heat sources. Keep containers away from incompatible materials such as water, alcohols, and bases, as these can cause violent reactions. Storage areas should be equipped with appropriate spill containment measures and emergency equipment due to the substance's corrosive and toxic properties.

Thionyl dichloride contact requires immediate action due to its corrosive properties. In case of skin contact, immediately remove contaminated clothing and flush the affected area with plenty of water for at least 15 minutes. For eye contact, rinse thoroughly with water and seek immediate medical attention. If inhaled, move to fresh air immediately. Always seek professional medical advice following any exposure incident.

Thionyl dichloride disposal must comply with local and European waste regulations as it is classified as hazardous waste. The substance should be neutralized carefully by qualified professionals using appropriate methods before disposal. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Never discharge into sewers, waterways, or soil due to its corrosive and toxic nature.

Thionyl dichloride is classified under ADR Class 8 (corrosive substances) with Packing Group I, indicating high danger level. Transportation requires proper packaging in UN-approved containers with appropriate labeling including GHS05 and GHS07 pictograms and 'Danger' signal word. Vehicles must carry appropriate emergency equipment and drivers need ADR certification for transporting this corrosive material.

Thionyl dichloride is subject to European REACH regulation and CLP classification requirements. It is classified with hazard classes Acute Tox. 4 and Skin Corr. 1A, requiring specific labeling with GHS pictograms and safety data sheets. The substance is not listed as SVHC (Substance of Very High Concern), but users must comply with occupational safety regulations and proper risk assessment procedures.

Thionyl dichloride is available through OYSI, a European distributor of technical chemicals specializing in industrial and professional applications. As an established chemical distributor, OYSI can provide this regulated substance to qualified customers with proper documentation and compliance requirements. Contact OYSI directly for availability, technical specifications, and regulatory documentation needed for your specific application requirements.