3,4-dichloroaniline

3,4-dichloroaniline is an aromatic amine compound with the molecular formula C6H5Cl2N and CAS number 95-76-1. It consists of an aniline molecule substituted with two chlorine atoms at the 3 and 4 positions of the benzene ring. With a molecular weight of 162.01 g/mol, this chemical intermediate is classified as highly hazardous, requiring careful handling due to its acute toxicity, eye damage potential, and skin sensitization properties.

3,4-dichloroaniline is typically a crystalline solid at room temperature, appearing as light brown to gray crystals or powder. It has limited solubility in water but dissolves well in organic solvents such as ethanol, acetone, and benzene. The compound exhibits characteristic aniline-like odor and is sensitive to light and air, which can cause discoloration. Its melting point is around 71-72°C, and it has relatively low volatility at ambient temperatures.

3,4-dichloroaniline is primarily used as an intermediate in the synthesis of dyes, pigments, and pharmaceuticals. It serves as a key building block in the production of azo dyes and serves as a precursor for various agrochemical compounds including herbicides and pesticides. The compound is also utilized in the manufacturing of specialty chemicals and polymer additives. Its applications are mainly confined to industrial settings due to its hazardous nature.

3,4-dichloroaniline requires strict safety measures including chemical-resistant gloves, safety goggles, and respiratory protection in well-ventilated areas. Personnel must wear appropriate protective clothing to prevent skin contact, as the compound can cause sensitization and is acutely toxic. Work should be conducted in fume hoods or controlled environments. Emergency washing facilities must be readily available, and personnel should be trained on proper handling procedures to minimize exposure risks.

3,4-dichloroaniline should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Storage areas must be secured and accessible only to trained personnel. The compound should be kept away from strong oxidizing agents, acids, and bases to prevent dangerous reactions. Temperature should be maintained below 25°C, and containers should be properly labeled with hazard information and stored in secondary containment systems.

Skin contact with 3,4-dichloroaniline requires immediate removal of contaminated clothing and thorough washing with soap and water for at least 15 minutes. Eye contact demands immediate irrigation with clean water for 15-20 minutes and urgent medical attention due to potential eye damage. If inhaled, move the person to fresh air immediately. In case of ingestion, do not induce vomiting and seek immediate medical care. All exposure incidents require prompt medical evaluation.

3,4-dichloroaniline disposal must comply with local and European waste regulations as hazardous chemical waste. The compound cannot be disposed of in regular waste streams or sewage systems due to its environmental toxicity and acute hazard classification. Disposal should be handled by licensed hazardous waste management companies through approved methods such as high-temperature incineration. All waste containers must be properly labeled and documented according to regulatory requirements.

3,4-dichloroaniline is classified under ADR Class 6.1 (toxic substances) Packing Group II, requiring specialized transport procedures. Packages must bear appropriate hazard labels including GHS06 (skull and crossbones), GHS05 (corrosion), and GHS09 (environmental hazard) pictograms. Transport must comply with UN packaging requirements and be handled by certified dangerous goods carriers. Shipping documentation must include proper shipping names, hazard classifications, and emergency response information.

3,4-dichloroaniline is subject to European REACH regulation requiring registration and safety data sheets. Under CLP regulation, it carries multiple hazard classifications including acute toxicity, eye damage, skin sensitization, and aquatic toxicity, requiring the 'Danger' signal word. The compound may be subject to additional restrictions on use and supply. Companies handling this substance must comply with occupational health regulations and environmental protection requirements across EU member states.

3,4-dichloroaniline is available through specialized chemical distributors in Europe, including OYSI, which supplies high-quality chemical products to industrial customers across European markets. Due to its hazardous classification and regulatory requirements, purchase is typically restricted to qualified industrial users with proper handling facilities and safety measures. Suppliers must provide comprehensive safety documentation and ensure compliance with REACH and transportation regulations for professional applications.