Thionyl dichloride

Thionyl dichloride is an inorganic compound with the chemical formula Cl2OS and CAS number 7719-09-7. This chemical substance has a molecular weight of 118.97 g/mol and belongs to the class of acid chlorides. It is classified as a corrosive substance with acute toxicity properties, requiring careful handling in industrial and laboratory applications. Thionyl dichloride is widely recognized for its strong reactivity and utility in various chemical synthesis processes.

Thionyl dichloride is a colorless to pale yellow liquid at room temperature with a pungent, irritating odor. It has a boiling point of approximately 76°C and decomposes in the presence of moisture, releasing hydrogen chloride and sulfur dioxide gases. The compound is highly reactive with water and alcohols, making it moisture-sensitive. It is soluble in organic solvents but reacts violently with water, requiring anhydrous storage conditions.

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 fine chemical synthesis. The compound is also utilized in the preparation of organosulfur compounds and as a dehydrating agent in various chemical processes, making it valuable in research and industrial applications.

Thionyl dichloride must be handled with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing due to its corrosive properties. Work should be conducted in well-ventilated areas or under fume hoods to avoid inhalation of vapors. Given its Acute Tox. 4 and Skin Corr. 1A classifications, operators must follow strict safety protocols and ensure emergency procedures are readily available.

Thionyl dichloride must be stored in tightly sealed, moisture-proof containers away from water and humidity sources. Storage areas should be cool, dry, and well-ventilated, separated from incompatible materials such as alcohols, amines, and water. The containers should be made of compatible materials and stored in secondary containment systems. Regular inspection of storage conditions and container integrity is essential to prevent accidental releases or decomposition.

Immediate action is required in case of contact with thionyl dichloride due to its corrosive nature. For skin contact, remove contaminated clothing and flush the affected area with plenty of water for at least 15 minutes. In case of eye contact, rinse thoroughly with water and seek immediate medical attention. If inhaled, move the person to fresh air and provide respiratory support if needed. Always seek professional medical assistance promptly.

Thionyl dichloride waste must be disposed of according to local and international hazardous waste regulations. The compound should never be poured down drains or disposed of with regular waste due to its corrosive and toxic properties. Proper disposal typically involves neutralization by qualified waste management companies or incineration in specialized facilities. Always consult local environmental authorities and follow established hazardous waste disposal protocols.

Thionyl dichloride is classified under ADR Class 8 (corrosive substances), Packing Group I, indicating high danger level for transportation. It must be packaged in UN-approved containers and labeled with appropriate hazard symbols including GHS05 and GHS07 pictograms. Transportation requires proper documentation, trained personnel, and compliance with international dangerous goods regulations. Emergency response procedures must be available during transport.

Thionyl dichloride is subject to various chemical regulations including REACH registration requirements in Europe and CLP classification obligations. While not listed as an SVHC (Substance of Very High Concern), it must comply with workplace safety regulations due to its corrosive and toxic properties. Users must follow proper labeling with 'Danger' signal words and appropriate pictograms, ensuring compliance with occupational health and safety standards.

Thionyl dichloride is available through OYSI, a European distributor of technical chemicals specializing in industrial and laboratory-grade chemical products. As an established chemical supplier, OYSI provides quality thionyl dichloride with proper documentation and regulatory compliance for European markets. Contact OYSI directly for availability, technical specifications, and delivery options to meet your specific industrial or research requirements while ensuring full regulatory compliance.