Overview
High-purity dichloroethane (1,2-Dichloroethane or EDC) is a chlorinated hydrocarbon primarily manufactured through the direct chlorination or oxychlorination of ethylene. As a key intermediate in PVC production, it accounts for over 90% of global EDC consumption. Industrial-grade EDC typically exceeds 99.5% purity, with residual impurities carefully controlled to prevent catalyst poisoning in downstream processes. The chemical's high solvency and relatively low cost have made it a staple in adhesives, pharmaceuticals, and textile processing, though regulatory pressures are driving substitution in some applications. Modern production facilities employ closed-loop systems to minimize emissions of this volatile organic compound (VOC).
Physical and Chemical Properties
EDC is a dense, non-corrosive liquid that evaporates quickly at room temperature. Its vapor is 3.4 times heavier than air, creating potential accumulation hazards in confined spaces. The compound forms azeotropes with water (boiling point 71.5°C at 8% water) and various alcohols, which impacts distillation processes. Chemically, EDC undergoes dehydrochlorination to form vinyl chloride at high temperatures (500°C) or with catalysts. This reaction is the basis of PVC manufacturing. It also participates in nucleophilic substitution reactions, making it valuable for synthesizing ethylenediamine and other derivatives. Compatibility concerns include violent reactions with alkali metals and strong oxidizers like potassium permanganate.
Main Applications
The dominant use of high-purity EDC lies in vinyl chloride monomer (VCM) production, where it serves as the essential feedstock. Nearly all PVC plastics globally originate from EDC through thermal cracking processes. In the rubber industry, EDC acts as a solvent for neoprene and other synthetic elastomers during compounding and adhesive formulation. Specialty applications include extracting caffeine (decaffeination), producing tetraethyllead (historically), and synthesizing ethylenediamine for crop protection chemicals. Recent innovations explore its role as a carrier fluid in shale oil extraction, though environmental regulations limit this use in many jurisdictions.
Safety and Storage
Classified as a Category 2 carcinogen (suspected human carcinogen) under EU CLP regulations, EDC requires strict exposure controls. Workplace air concentrations should remain below 10 ppm (OSHA PEL). Storage tanks require nitrogen blanketing to prevent peroxide formation and must be electrically grounded to avoid static discharge ignition. Spill response necessitates chemical-resistant PPE (butyl rubber gloves, SCBA) and containment to prevent groundwater contamination. Firefighting requires alcohol-resistant foam due to EDC's partial water solubility. Waste disposal must comply with RCRA regulations (hazardous waste code U077 in the U.S.).
B2B Procurement Guide
Industrial buyers should specify purity (≥99.5%), acidity (≤10 ppm as HCl), and non-volatile residue (≤50 ppm) when procuring technical-grade EDC. ISO tank containers or specialized steel drums are preferred for bulk shipments to prevent moisture ingress. Key supplier qualifications include REACH registration, Responsible Care certification, and batch-specific GC analysis reports. Market prices fluctuate with ethylene and chlorine feedstock costs, typically ranging $500-800/ton for contract volumes. Just-in-time procurement is advisable due to EDC's limited shelf life (6-12 months in optimal storage). Alternative solvents like 1,2-dichloropropane may be considered where regulatory restrictions apply.
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