Ethylene Glycol[4]
Overview
Ethylene glycol (EG) is a vital industrial chemical primarily synthesized from ethylene oxide. It is a key ingredient in antifreeze formulations due to its ability to lower the freezing point of water. Beyond automotive applications, EG serves as a precursor for polyester fibers (e.g., PET) and plasticizers. The compound’s hygroscopic nature and thermal stability make it indispensable in HVAC systems and heat transfer fluids. Globally, demand is driven by the automotive and textile industries, with Asia-Pacific being the largest consumer.
Physical and Chemical Properties
EG is a viscous, colorless liquid with a sweet taste but high toxicity. Its molecular structure—two hydroxyl groups on adjacent carbons—enhances hydrogen bonding, explaining its high boiling point and water solubility. The density (1.113 g/cm³) and viscosity are higher than water, affecting handling and mixing processes. EG’s reactivity includes esterification (to produce polyesters) and oxidation (to glycolic acid). It is incompatible with strong oxidizers like potassium permanganate, posing fire risks under specific conditions.
Main Applications
Over 50% of EG production is used in antifreeze/coolant blends for vehicles, where it prevents engine freezing and overheating. In textiles, it polymerizes with terephthalic acid to create PET for bottles and fabrics. EG-based deicers are critical for aviation and runway safety. Emerging uses include energy storage (as a component in some battery electrolytes) and gas hydrate inhibition in oil pipelines. Its solvent properties also apply in paints and adhesives.
Safety and Storage
EG is classified as harmful if swallowed (LD50 ~1.4 g/kg in rats). Ingestion can cause metabolic acidosis and kidney failure. Always use chemical-resistant gloves (e.g., nitrile) and eye protection. Spills should be contained with inert absorbents like sand. Store EG in HDPE or stainless steel containers, avoiding aluminum due to corrosion risks. Maintain storage temperatures below 40°C to prevent degradation. Regulatory compliance (e.g., OSHA, REACH) requires proper labeling and SDS documentation.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 9001 certification to ensure consistent purity (≥99.5%). Rail or tanker shipments reduce costs for orders exceeding 20 metric tons. Testing for diethylene glycol (DEG) contamination is critical, as DEG is a toxic byproduct. Contracts should specify delivery terms (Incoterms 2020), such as CIF for international shipments. Spot prices fluctuate with ethylene feedstock costs; long-term agreements hedge against volatility. Recycled EG (from used antifreeze) offers a sustainable alternative but requires rigorous purification.
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