Monoethylene glycol (MEG), diethylene glycol (DEG) are both members of the glycol family, but they have distinct chemical properties, structures, and applications that make them suitable for different uses. Understanding the differences between these compounds is essential for industries such as petrochemicals, automotive, pharmaceuticals, and more.
Monoethylene Glycol (MEG)
MEG is the simplest diol, with the chemical formula C₂H₆O₂. Its two carbon atoms are bonded to hydroxyl groups, classifying it as an alkaline alcohol compound. It is colorless, odorless, and hygroscopic. With a low molecular weight of 62.07 g/mol, it is highly soluble in water and commonly used as a solvent and antifreeze agent.
Diethylene Glycol (DEG)
DEG has a more complex structure than MEG, with the chemical formula C₄H₁₀O₃. Its two ethylene glycol units are linked by an ether bond, forming a polymeric compound with a molecular weight of 106.12 g/mol. Like MEG, it is colorless, odorless, and highly hygroscopic, but possesses a higher boiling point and viscosity, making it suitable for diverse industrial applications.
MEG vs DEG: What's the Difference?
| Feature | MEG (Monoethylene Glycol) | DEG (Diethylene Glycol) |
|---|---|---|
| Chemical Formula | C₂H₆O₂ | C₄H₁₀O₃ |
| CAS Number | 107-21-1 | 111-46-6 |
| Molecular Weight | 62.07 g/mol | 106.12 g/mol |
| Appearance | Colorless, odorless liquid | Colorless, slightly viscous liquid |
| Boiling Point | 197 °C | 245 °C |
| Freezing Point | -12.9 °C | -6 °C |
| Viscosity (20 °C) | ~21 cP | ~32 cP |
| Solubility | Completely miscible with water | Completely miscible with water |
| Toxicity | Moderate; ingestion can be harmful | Higher toxicity; ingestion can be dangerous |
| Common Uses | - PET & polyester production- Automotive antifreeze- Heat transfer fluids | - Plasticizers- Solvents in paints and resins- Humectants in cosmetics (limited) |
| Cost | Generally cheaper than DEG | Slightly more expensive due to lower demand and specialty uses |
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