Overview
Ethylene glycol is a vital industrial chemical first synthesized in 1856 by French chemist Charles-Adolphe Wurtz. As the simplest diol, it serves as the backbone for numerous derivatives and applications. Global production exceeds 25 million tons annually, with China accounting for over 40% of capacity. The compound's unique combination of low freezing point depression, high boiling point, and solvent properties make it indispensable across multiple industries. In B2B contexts, ethylene glycol typically trades in bulk quantities (ISO tank containers or drums) with purity specifications varying by application. Industrial-grade (99.8% purity) dominates the market, while fiber-grade (99.9+%) commands premium pricing for polyester production. The market remains sensitive to feedstock (ethylene) prices and energy costs.
Physical and Chemical Properties
Ethylene glycol exhibits several notable physical properties: its -12.9°C freezing point enables effective antifreeze formulations when mixed with water (typically 50:50 ratios), while its 197.3°C boiling point suits high-temperature applications. The liquid's viscosity (16.1 mPa·s at 25°C) and density (1.113 g/cm³) affect pumping and handling requirements in industrial settings. Chemically, it undergoes three primary reactions: esterification (forming polyethylene terephthalate/PET), oxidation (to glyoxal), and etherification (producing di- and triethylene glycols as byproducts). Its hydroxyl groups make it highly hygroscopic, necessitating strict moisture control during storage. The compound shows moderate toxicity (LD50 4700 mg/kg) but becomes dangerous when metabolized to oxalic acid.
Main Applications
Automotive antifreeze represents ethylene glycol's largest application, where its 50-60% aqueous solutions provide freeze protection down to -37°C and boil-over protection up to 129°C. Modern formulations include corrosion inhibitors like sebacate salts. The polyester industry consumes about 30% of production, primarily for PET resin used in textiles (65%) and packaging (35%). Other significant uses include aircraft deicing fluids (mixed with thickeners and corrosion inhibitors), heat transfer fluids in gas processing plants, and as a solvent in paints/inks. Emerging applications include liquid desiccants for HVAC systems and as a hydrogen carrier in fuel cells. Regional demand varies considerably—North America prioritizes antifreeze, while Asia focuses on polyester production.
Safety and Storage
Ethylene glycol requires careful handling due to its toxicity and flammability (flash point 111°C). Ingestion risks necessitate clearly labeled containers and secure storage areas. OSHA's permissible exposure limit (PEL) is 50 ppm (ceiling), requiring ventilation in confined spaces. Secondary containment is mandatory for bulk storage to prevent groundwater contamination. Storage tanks should be carbon steel or stainless steel (304/316), with nitrogen blanketing recommended for long-term storage. Incompatibilities include strong oxidizers (may cause fires) and aluminum (corrosion risk). Spills require absorption with inert materials like vermiculite, never washed into drains. First aid measures include immediate washing for skin contact and induced vomiting (with medical supervision) for ingestion.
B2B Procurement Guide
Industrial buyers should specify purity (≥99.8% for most applications), water content (<0.1%), and DEG contamination (<0.1% for antifreeze). Automotive manufacturers often require additional testing for chloride and sulfate ions. Packaging options range from 200L drums ($1.50-2.00/kg) to ISO tank containers (reducing costs by 15-20%). Key supplier qualifications include ISO 9001 certification, REACH compliance for EU markets, and batch traceability. Asian suppliers (China, India) typically offer the most competitive pricing but may have longer lead times. Consider local stocking distributors for just-in-time needs. Contract terms should address quality disputes, with third-party lab testing provisions for high-volume purchases. Monitor ethylene feedstock price trends, as they directly impact glycol pricing.
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