Monoethylene Glycol

– MEG –

 

What is Mono Ethylene Glycol?

Monoethylene Glycol (also known as MEG) is a clear, colourless, virtually odourless, and slightly viscous liquid.  It is miscible with water, alcohols and many organic compounds, it has the formula C₂H₆O₂.  It is the most important of the commercially available ethylene glycols as it has many industrial applications.

 

Monoethylene glycol (MEG) is primarily manufactured using the ethylene oxide route. This process entails the oxidation of ethylene with oxygen or air, followed by the hydration of ethylene oxide to produce MEG. This compound possesses several key features that make it highly valuable.

It exhibits excellent solvent properties, making it suitable for various industrial applications. Additionally, MEG has low volatility and low viscosity, contributing to its stability in different environments.

In household uses, Monoethylene Glycol is also a popular coolant liquid in many equipment such as air conditioning. However, it is more commonly used in antifreeze formulations. It can prevent the formulation of ice crystals because it interferes with hydrogen bonds. This makes it difficult for the water molecules to freeze. Pure Monoethylene Glycol freezes at -12°C, so it greatly lowers the freezing point of water when it is added.

 

 

Top Uses of Monoethylene Glycol:

 

Antifreeze and Coolants: MEG is a primary ingredient in antifreeze formulations due to its ability to lower the freezing point of water. This property is crucial in automotive coolants to prevent freezing and overheating in engines.

 

Industrial Humectants: In the textile industry, MEG is used as a humectant to maintain moisture in fibres during processing, thereby enhancing the quality of the final product.

 

Plastics Industry: MEG is a key component in the production of polyethylene terephthalate (PET) resins, used in making bottles for beverages, packaging materials, and synthetic fibres for clothing.

 

Solvent Use: Due to its solvent properties, MEG is utilized in applications such as ink, adhesives, and paint industries. It helps in improving the solubility of various substances and enhancing product stability.

 

Pharmaceutical Applications: MEG is used as a solvent and a carrier for pharmaceutical products, especially in topical, oral, and injectable formulations, where it enhances medication stability and effectiveness.

 

De-icing Solutions: In colder climates, MEG is applied to aircraft and runways as a de-icing agent. Its ability to depress the freezing point of water helps in removing and preventing the accumulation of ice.

 

Heat Transfer Fluids: MEG, due to its thermal properties, is used in industrial heat transfer agents. It’s effective in both heating and cooling systems, particularly where there is a risk of freezing or overheating.

 

Hydraulic and Brake Fluids: It’s a component in hydraulic fluids and brake fluids, providing stability and efficiency in various temperature ranges.

 

Chemical Intermediates: MEG serves as a building block in the production of various chemical intermediates used in making solvents, plasticizers, and other fine chemicals.

 

Cosmetic and Personal Care Products: In the cosmetics industry, MEG is used as a solvent in formulations like lotions, shampoos, and other skincare products, enhancing texture and moisture retention.

 

 

         What is MEG used for?

• Anti-freezing and anti-icing additive
• Humidifying and plasticizing
• Dehydrating
• Coupling printing inks
• Textile conditioning
• Solvent for dyes in textile and leather finishing
• Agricultural formulation
• General purpose cleaners
• Explosives manufacture
• Electrolytic component
• Humectant
• Water-based coating
• Preservative, rust remover and disinfectant

 

 

Frequently Asked Questions:

 

What is Monoethylene Glycol (MEG)?

Monoethylene Glycol (MEG) is a colourless, odourless, and slightly sweet-tasting organic compound used primarily as an antifreeze and coolant in various industrial applications.

 

 

What are the primary uses of Monoethylene Glycol?

MEG is used primarily as a coolant and antifreeze in industrial processes, especially in the production of polyester fibres, resins, and as a de-icing agent in the aviation industry.

 

Can MEG be used in automotive antifreeze?

Yes, MEG can be used as an automotive antifreeze when properly diluted with water. It helps prevent freezing and overheating in a vehicle’s engine.

 

Is MEG safe to handle and store?

When handled and stored according to safety guidelines, MEG is generally considered safe. However, it’s essential to use appropriate personal protective equipment and follow safety precautions.

 

Can MEG be diluted with water for specific applications?

Yes, MEG can be diluted with water to achieve the desired concentration for various applications, including antifreeze solutions.

 

What is the shelf life of MEG when stored properly in a bottle?

When stored in a tightly sealed container and kept away from extreme temperatures, MEG typically has a shelf life of several years.

 

Are there any specific precautions for handling MEG?

It’s crucial to wear appropriate protective gear, including gloves and eye protection, when handling MEG. Additionally, follow the safety data sheet (SDS) and handling instructions provided by the manufacturer.

 

 

Safety and Handling:

MEG should be handled with care as it can be toxic if ingested or absorbed through the skin.

Appropriate safety gear, like gloves and goggles, is recommended during handling.

IF INHALED: Remove casualty from exposure ensuring one’s own safety whilst doing so. Consult a doctor

IF IN EYES: Bathe the eye with running water for 15 minutes. Consult a doctor.

IF CONTACTS WITH SKIN: Wash immediately with plenty of soap and water. Consult a doctor

IF INGESTED: Wash out mouth with water. Do not induce vomiting. Transfer to hospital as soon as possible

 

 

Chemical Composition and Properties:

Chemical Formula: C2H6O2

Appearance: Colourless, odourless liquid with a sweet taste.

Physical State: Hygroscopic and miscible with water, alcohol, and many organic compounds.

Boiling Point: About 197.3°C (387.1°F).

Freezing Point: -12.9°C (8.8°F).

 

 

*We hold MSDS (Material Safety Data Sheet) for all hazardous goods. No MSDS is required by EU regulation to all neutral products however we can provide on request with wholesale orders. This service is available upon request as a PDF file.

 

 

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