Monoethylene Glycol (MEG), commonly abbreviated as MEG, is a colorless, odorless, and viscous organic compound with the chemical formula C₂H₆O₂. It is the simplest member of the ethylene glycol family, a group of diols (compounds containing two hydroxyl groups, -OH). MEG is commonly known for its use in the production of antifreeze, polyester fibers, and various other industrial applications.
Properties:
- Molecular Formula: C₂H₆O₂ (CH₂OH-CH₂OH)
- IUPAC Name: Ethylene glycol
- Molar Mass: 62.07 g/mol
- Boiling Point: 197.6°C (387.7°F)
- Melting Point: -12.9°C (8.8°F)
- Density: 1.113 g/cm³ at 20°C
- Solubility: Highly soluble in water and most organic solvents.
Key Uses of Monoethylene Glycol (MEG):
Solvent:
Used as a solvent in paints, coatings, and adhesives, MEG plays a role in the formulation of certain water-based coatings and adhesives.
Plasticizers:
MEG is sometimes used as a plasticizer to improve the flexibility and durability of plastics.
Polyester Fiber and Resin Production:
MEG is a primary raw material in the production of polyester fibers, which are used in textiles, clothing, carpets, and upholstery. It’s also used in PET (polyethylene terephthalate) production for plastic bottles, food containers, and packaging materials.
Antifreeze and Coolants:
MEG is most commonly used as the base ingredient in automotive antifreeze and coolants.
- Ethylene glycol-based antifreeze helps lower the freezing point and increase the boiling point of engine coolants.
Plastics and Polymers:
MEG is used to produce polyethylene terephthalate (PET) and other polyester-based plastics. These plastics are used in products like:
- Plastic bottles, films, and containers.
- Food packaging and textile fibers.
Hydraulic Fluids and De-icing:
MEG is also used in hydraulic fluids and de-icing fluids, particularly in aircraft de-icing and road de-icing.
Heat Transfer Fluids:
MEG is employed in heat transfer fluids for various industrial applications due to its excellent heat absorption and transfer properties.