Key Properties
Diethylene Glycol (DEG) is a hydroxyether compound with the molecular formula C₄H₁₀O₃ and CAS No. 111-46-6. It appears as a colorless, odorless, viscous liquid with hygroscopic properties. It has a boiling point of approximately 245 °C and is completely miscible with water and many organic solvents. DEG is more hydrophilic than most diols due to its ether structure.
Key Features
DEG is a versatile solvent and chemical intermediate with strong moisture absorption capability. It provides excellent compatibility with resins, dyes, and polymers, and is widely used to improve flexibility and processing performance in polyester and polyurethane systems. Its hygroscopic nature makes it effective in gas dehydration and moisture control applications.
Main Applications
DEG is widely used in the production of saturated and unsaturated polyester resins, polyurethanes, and plasticizers. It serves as a solvent for nitrocellulose, resins, dyes, oils, and adhesives. It is also used in brake fluids, lubricants, antifreeze formulations, printing inks, and natural gas dehydration systems. Additionally, DEG acts as a humectant in tobacco, paper, and coatings industries.
Production Process
Diethylene Glycol is produced as a co-product during the hydration of ethylene oxide. Ethylene is first oxidized to ethylene oxide, which is then reacted with water to form monoethylene glycol, diethylene glycol, and higher glycols. DEG is separated and purified through distillation processes.
