1,4-dichlorobenzene

1,4-dichlorobenzene is an aromatic organochlorine compound with the molecular formula C6H4Cl2 and CAS number 106-46-7. It consists of a benzene ring with two chlorine atoms positioned at opposite ends (para position). This white crystalline solid has a distinctive sweet odor and a molecular weight of 147 g/mol. It is classified as a potentially carcinogenic substance and poses risks to aquatic environments.

1,4-dichlorobenzene is a white crystalline solid at room temperature with a characteristic sweet, mothball-like odor. It has low water solubility but dissolves readily in organic solvents such as alcohol, ether, and benzene. The compound sublimes easily, transitioning directly from solid to vapor phase. It has a melting point of approximately 53°C and boiling point of 174°C, making it volatile under normal conditions.

1,4-dichlorobenzene is primarily used as an intermediate in chemical synthesis, particularly in the production of pesticides, dyes, and pharmaceuticals. It serves as a precursor for manufacturing other chlorinated aromatic compounds. Historically, it was widely used as a moth repellent and air freshener, though these applications have decreased due to health concerns. Industrial applications include use as a fumigant and in specialized chemical manufacturing processes.

1,4-dichlorobenzene requires careful handling with appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and respiratory protection in poorly ventilated areas. Work should be conducted in well-ventilated spaces or under fume hoods to minimize inhalation exposure. Avoid direct skin and eye contact, as the substance can cause irritation. Ensure no ignition sources are present, and follow proper hygiene practices including thorough handwashing after handling.

1,4-dichlorobenzene should be stored in a cool, dry, well-ventilated area away from heat sources and direct sunlight. Use tightly sealed containers made of compatible materials to prevent sublimation and vapor escape. Store separately from incompatible substances such as strong oxidizing agents and bases. Maintain storage temperatures below 25°C when possible and ensure storage areas are equipped with appropriate spill containment measures and emergency equipment.

In case of skin contact with 1,4-dichlorobenzene, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, rinse immediately with clean water for 15-20 minutes and remove contact lenses if present. If inhaled, move to fresh air immediately. For ingestion, do not induce vomiting and seek immediate medical attention. In all cases of significant exposure, consult a physician promptly.

1,4-dichlorobenzene must be disposed of as hazardous waste through licensed waste management companies in compliance with local and European regulations. It cannot be disposed of in regular municipal waste or poured down drains due to its environmental persistence and toxicity. Incineration at high temperatures in authorized facilities is typically the preferred disposal method. Always consult with certified waste disposal specialists and maintain proper documentation for regulatory compliance.

1,4-dichlorobenzene is classified as ADR Class 9 (miscellaneous dangerous substances), Packing Group III for transportation purposes. It requires appropriate hazardous goods documentation, labeling with GHS08, GHS07, and GHS09 pictograms, and packaging in UN-approved containers. Vehicles must carry emergency response information and drivers need ADR certification. Transport should follow the European Agreement concerning the International Carriage of Dangerous Goods by Road regulations.

1,4-dichlorobenzene is subject to comprehensive European chemical regulations including REACH registration requirements and CLP classification as Carcinogenic Category 2, Eye Irritant Category 2, and Aquatic Acute/Chronic Category 1. It requires safety data sheets and appropriate hazard labeling with warning signal word. While not currently listed as an SVHC, its carcinogenic classification means it faces restrictions in consumer applications and requires careful occupational exposure management under workplace safety directives.

1,4-dichlorobenzene is available through OYSI, a specialized European distributor of technical chemicals. As an established supplier, OYSI provides this compound to industrial and research customers across Europe, ensuring full regulatory compliance and proper documentation. Professional chemical distributors like OYSI offer technical support, appropriate packaging, and safety documentation required for industrial applications. Contact specialized chemical suppliers for specific quantities, specifications, and delivery arrangements.