Overview
2-(2-Hydroxyethoxy)ethanol, or diethylene glycol (DEG), is an organic compound derived from ethylene oxide. It is widely used in industrial and consumer applications due to its solvent properties and hygroscopic nature. DEG is a key intermediate in the production of resins, plasticizers, and other specialty chemicals. First synthesized in the early 20th century, DEG has become a staple in industries ranging from automotive to personal care. Its low toxicity compared to similar glycols like ethylene glycol makes it a preferred choice for certain applications, though ingestion remains hazardous.
Physical and Chemical Properties
DEG is a colorless, viscous liquid with a mild sweet taste. Its high boiling point (245°C) and low volatility make it suitable for high-temperature processes. The compound is hygroscopic, readily absorbing moisture from the air, which is advantageous in humectant applications. Chemically, DEG is stable under normal conditions but can decompose at high temperatures, releasing toxic fumes. It forms azeotropes with water and other solvents, a property leveraged in distillation processes. Its miscibility with polar and non-polar solvents enhances its versatility as a formulation component.
Main Applications
DEG serves as a solvent in paints, inks, and adhesives, where it improves flow and drying properties. In the automotive sector, it is used in antifreeze blends, though less commonly than ethylene glycol due to toxicity concerns. The personal care industry utilizes DEG as a humectant in lotions and creams. Industrial applications include gas dehydration, where DEG absorbs water from natural gas streams. It also acts as a plasticizer in cellulose-based products and a chemical intermediate in synthesizing morpholine and other derivatives. Regulatory restrictions limit its use in food and pharmaceuticals.
Safety and Storage
DEG is harmful if swallowed, causing kidney failure and neurological damage. Proper PPE—gloves, goggles, and respirators—is essential when handling. Ensure workplaces are well-ventilated to avoid vapor accumulation. Store DEG in stainless steel or polyethylene containers, away from oxidizers and heat sources. Bulk storage tanks should include secondary containment to prevent spills. Follow local regulations for disposal, as DEG is not readily biodegradable and can contaminate water supplies.
B2B Procurement Guide
When procuring DEG, prioritize suppliers with ISO or equivalent certifications to ensure quality. Specify purity requirements (e.g., ≥99.5% for industrial use) and request CoA (Certificate of Analysis). Bulk shipments via tankers are cost-effective for large-scale buyers, while drums suit smaller quantities. Monitor market trends, as prices fluctuate with ethylene oxide feedstock costs. Consider regional logistics; for example, Asian markets often offer competitive pricing. Audit suppliers for compliance with environmental and safety standards to mitigate risks.
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