Quinoline

Quinoline is a heterocyclic aromatic organic compound with the molecular formula C9H7N and CAS number 91-22-5. It consists of a benzene ring fused to a pyridine ring, forming a bicyclic structure with a molecular weight of 129.16 g/mol. This nitrogen-containing compound appears as a colorless to pale yellow liquid with a characteristic strong odor. Quinoline is classified as a hazardous substance with carcinogenic and mutagenic properties, requiring careful handling in industrial applications.

Quinoline is a colorless to pale yellow liquid at room temperature with a distinctive strong, penetrating odor. It has a boiling point of approximately 237°C and a melting point of -15°C. The compound is slightly soluble in water but readily dissolves in organic solvents such as ethanol, ether, and benzene. Quinoline exhibits basic properties due to its nitrogen atom and can form salts with acids. It has a density of about 1.09 g/cm³ and is hygroscopic, meaning it absorbs moisture from air.

Quinoline serves as an important intermediate in the pharmaceutical and chemical industries. It is primarily used in the synthesis of antimalarial drugs, dyes, and other pharmaceuticals. The compound acts as a precursor for manufacturing various quinoline derivatives used in medicinal chemistry. Additionally, quinoline finds applications in the production of corrosion inhibitors, rubber accelerators, and as a solvent in certain industrial processes. Its derivatives are also utilized in the manufacture of agricultural chemicals and specialty chemicals for research purposes.

Quinoline requires strict safety measures due to its carcinogenic and toxic properties. Always wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Work in well-ventilated areas or under fume hoods to prevent inhalation exposure. Avoid skin and eye contact completely. Use non-sparking tools as quinoline is flammable. Implement proper hygiene practices including thorough hand washing after handling. Ensure emergency shower and eyewash stations are readily accessible, and train personnel on proper handling procedures and emergency response.

Quinoline must be stored in tightly sealed containers in a cool, dry, well-ventilated area away from heat sources, sparks, and direct sunlight. Keep containers in secondary containment to prevent spills and maintain temperatures below 25°C. Store separately from strong oxidizing agents, acids, and incompatible materials. Ensure storage areas have appropriate fire suppression systems and spill cleanup materials readily available. Use original manufacturer containers when possible, and implement proper inventory rotation procedures. Access should be restricted to trained personnel only.

Quinoline exposure requires immediate action due to its toxic properties. For skin contact, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. In case of eye contact, flush immediately with clean water for at least 15 minutes while holding eyelids open. If inhaled, move the person to fresh air immediately and seek medical attention. For ingestion, do not induce vomiting and seek immediate medical care. Always consult a physician after any exposure incident.

Quinoline disposal must comply with local and international hazardous waste regulations due to its carcinogenic classification. The substance cannot be disposed of in regular waste streams and requires specialized hazardous waste treatment. Contact licensed hazardous waste disposal companies for proper collection and treatment. Incineration at high temperatures in approved facilities is typically the preferred disposal method. Maintain detailed records of all disposal activities as required by regulations. Never pour quinoline down drains or into the environment, as it poses significant environmental risks.

Quinoline is classified under ADR Class 6.1 (Toxic substances), Packing Group III for transportation purposes. It must be packaged in approved containers according to UN packaging requirements and properly labeled with hazard placards and shipping documentation. Transport vehicles must comply with ADR regulations for toxic substances, including proper ventilation and emergency equipment. Drivers require hazardous materials training certification. Ensure proper segregation from incompatible materials during transport and maintain emergency response information readily available throughout the journey.

Quinoline is subject to extensive regulatory oversight due to its hazardous properties. Under REACH regulation, it requires registration for manufacturing or importing above certain thresholds. The substance is classified under CLP regulation with multiple hazard categories including carcinogenicity 1B and mutagenicity 2. Various national and international regulations may restrict its use or require special permits. Users must comply with occupational exposure limits, proper labeling requirements, and safety data sheet provisions. Regular monitoring and reporting may be required depending on usage quantities and applications.

Quinoline is available through specialized chemical distributors in Europe, including OYSI, a professional distributor of technical chemicals. Due to its hazardous classification, quinoline can only be supplied to qualified industrial users with proper handling capabilities and regulatory compliance. Suppliers must verify customer credentials and intended use before sale. Professional distributors like OYSI provide proper packaging, documentation, and technical support to ensure safe handling and regulatory compliance. Contact authorized chemical suppliers directly to discuss specific requirements, quantities, and delivery arrangements for your industrial applications.