Monoethylene glycol (MEG), also known as ethylene glycol, is a chemical compound with the molecular formula C2H6O2. It is a colorless, odorless, and sweet-tasting liquid that is widely used in various industrial applications and consumer products. Here are some key points about monoethylene glycol:

Antifreeze and Coolant: One of the most well-known uses of MEG is as an antifreeze and coolant in automotive engines and heating, ventilation, and air conditioning (HVAC) systems. MEG lowers the freezing point and raises the boiling point of water, preventing engine damage in cold weather and overheating in hot weather.

2. Deicing Agent: MEG is used as a deicing agent in aviation and road maintenance to melt ice and snow. It helps improve safety on icy runways, roads, and sidewalks.

3. Humectant: MEG is a hygroscopic compound, meaning it attracts and holds water molecules. This property makes it useful as a humectant in products like personal care items, cosmetics, and some foods to retain moisture.

4. Polyester Resin and Fiber Production: MEG is a key raw material in the production of polyester resins and fibers. These materials are used in the textile and plastic industries for the manufacturing of clothing, bottles, and various plastic products.

5. Chemical Intermediary: MEG is used as a chemical intermediary in the production of various chemicals and products, including plastics, paints, coatings, adhesives, and even as an ingredient in some antifreeze formulations.

6. Antifreeze Poisoning: MEG is toxic if ingested, and cases of accidental poisoning, especially in pets and children, can be life-threatening. It’s important to handle products containing MEG with care and to store them out of reach of children and animals.

7. Industrial and Commercial Applications: MEG is widely used in industrial and commercial settings, such as in HVAC systems, industrial coolants, hydraulic fluids, and as a drying agent in natural gas processing.

8. Environmental Considerations: Proper disposal and recycling of products containing MEG are essential to minimize environmental impact. Some industries are exploring more environmentally friendly alternatives.

Monoethylene glycol is a versatile compound with a range of important industrial and consumer applications. Its ability to lower the freezing point and raise the boiling point of water, along with its hygroscopic properties, makes it valuable in industries ranging from automotive to textiles and personal care products. Proper handling and disposal are essential to ensure the safety of both humans and the environment.