Overview
1,2-Dichlorobenzene (o-DCB) is a chlorinated derivative of benzene with two adjacent chlorine atoms. It is a versatile industrial chemical produced via chlorination of benzene or chlorobenzene. The compound exhibits excellent solvent properties for resins, waxes, and rubber, making it valuable in manufacturing processes. As a high-boiling aromatic solvent, o-DCB is less volatile than many alternatives, which reduces evaporation losses during industrial use. Its stability under heat and resistance to oxidation contribute to its widespread adoption in niche applications where milder solvents fail.
Physical and Chemical Properties
The liquid has a characteristic aromatic odor and demonstrates low water solubility (0.15 g/L at 20°C) but high miscibility with most organic solvents like ethanol and ether. Its density of 1.30 g/cm³ makes it heavier than water. The chlorine substituents increase molecular polarity compared to benzene, enhancing its solvency for polar and non-polar compounds. Chemically, o-DCB undergoes electrophilic substitution reactions typical of aromatic compounds, though at slower rates due to electron-withdrawing chlorine effects. It is stable under normal conditions but may decompose at high temperatures (>200°C) to release toxic hydrogen chloride gas.
Main Applications
Primary uses include solvent applications in paint strippers, dye carriers for textiles, and degreasing formulations for metal cleaning. It serves as a reaction medium in the synthesis of agrochemicals like herbicides and as an intermediate for producing 3,4-dichloroaniline. In niche sectors, o-DCB functions as a heat transfer fluid and dielectric fluid in transformers. The electronics industry utilizes it for printed circuit board cleaning, while rubber manufacturers employ it as a processing aid for synthetic elastomers. Recent applications include use as a scavenger for removing nitrogen oxides in chemical processes.
Safety and Storage
Classified as harmful (Xn) under EU regulations, o-DCB requires handling with nitrile or neoprene gloves, chemical goggles, and respiratory protection in poorly ventilated areas. Prolonged exposure may cause central nervous system depression and liver/kidney damage. Spills should be contained with inert absorbents and disposed of as hazardous waste. Storage recommendations include steel or polyethylene containers kept below 40°C, separated from strong oxidizers. Facilities must have explosion-proof electrical equipment due to the liquid's flammability (flash point 66°C). Transportation requires UN1591 hazard labeling for toxic substances.
B2B Procurement Guide
Industrial buyers should specify technical grade (≥99% purity) or higher for critical applications. Bulk shipments typically range from 200kg drums to ISO tank containers (20,000L). Key procurement considerations include supplier certifications (ISO 9001), batch analysis reports, and compliance with REACH/TPCH regulations. Price fluctuations correlate with chlorine and benzene feedstock markets. Establishing long-term contracts with verified manufacturers (e.g., LANXESS, Kureha) ensures supply stability. Secondary distributors may offer smaller quantities but often at 15-30% premium over direct manufacturer pricing.
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