Applications of monoethylene glycol (MEG) in various industries

Applications of monoethylene glycol (MEG) in various industries

Applications of monoethylene glycol (MEG) in various industries Ethylene glycol under the brand name KEMEG is a chemical compound that is commonly used in many chemical products such as antifreezes and coolants. This product prevents the car engine from freezing in the cold season and from overheating in the hot season. This product is also used as a heat transfer fluid in industrial compressor gas coolers, ventilation systems and ice skating rinks. Ethylene glycol is used as a raw material in the preparation of various products such as polyester fibers for clothing, upholstery, carpets, pillows and fiberglass, and in products such as jet skis, bathtubs and bowling balls and polyethylene terephthalate resin. It is used in packaging covers and bottles.

Applications of monoethylene glycol

Ethylene glycol is mainly used as the main antifreeze, coolant and heat transfer fluid in cars, deicer in airplanes, cooling water in air supply systems and heat transfer fluid through geothermal heat pumps. Pure ethylene glycol should not be used alone as an engine coolant or antifreeze due to its low heat capacity and heat transfer coefficient. However, the physical properties of ethylene glycol solution in water are significant. By interfering with hydrogen bonding in water, this product makes water molecules bind together harder. This phenomenon causes ice crystals to form at a lower temperature. With this mechanism, freezing is prevented in the cold season of the year. Increasing the boiling point and decreasing the freezing point is one of the effects of increasing ethylene glycol in the aqueous solution, which increases the antifreeze ability of the solution. The lowest freezing temperature is -55 degrees Celsius and this is possible when the percentage of ethylene glycol in the solution is 70%. The percentage of ethylene glycol in the solution indicates the cooling capacity and the overall heat transfer coefficient of the solution, which affects the dynamic and thermal behavior of the thermal fluid. These properties make ethylene glycol an ideal antifreeze liquid for car and airplane windshields. KEMEG is also used in the rapid freezing process in biological laboratories to preserve biological samples. At the same time, this product is very useful and widely used, but eating it is extremely toxic. The sweet taste of this product may cause children or animals to eat it. Therefore, new generation antifreezes have entered the market, in which propylene glycol is used as a substitute for this product, which is not toxic.

Ethylene glycol is an important raw material in the production of some polymers such as polyurethane, polyethylene succinate (PES) and polyethylene terephthalate (PET). Head to tail polyurethane is produced from the addition polymer reaction between p-isocyanatobenzyl isocyanate and ethylene glycol together with an alkaline catalyst. This substance plays an important role in the production of polyethylene glycol as a reactant with ethylene oxide. This reaction is carried out catalytically and different types of PEG are produced as products.
To produce polyethylene terephthalate, ethylene glycol is heated together with terephthalic acid in the presence of a chemical catalyst. Finally, PET is produced as a melt. Next to polyethylene, polyethylene terephthalate is a very common and widely used plastic and is used in products such as conventional plastic bags and plastic bottles of mineral water and soft drinks to space blankets and gas cylinders. Plastic products, which include PET and PE, are used as containers for storing chemicals. Because having diverse properties and characteristics, they are compatible with a wide range of basic and acidic products

With the increase of oil and gas activity in deep waters, it is important to transfer and relocate oil and gas in long pipelines and prevent the product from becoming waterlogged. Dewatering and preventing the product from becoming watery in the pipeline is necessary to prevent corrosion. Ethylene glycol is usually used to dehydrate and prevent the product from becoming watery, and it prevents the creation of watery natural gas and can be used again after purification. In the natural gas industry, glycol dehydration is a system that uses a drying and dehumidifying liquid to remove water and moisture from the gas. This process is important because the natural gas obtained from underground sources is saturated with water vapor and if it is not removed, it causes serious damage to facilities and equipment, so the use of glycol dehydration is mandatory. In this process, different glycols are used. For example, triethylene glycol is used to remove moisture and water from natural gas and ethylene glycol is used in the refrigeration unit to reduce the temperature.

Ethylene glycol is a very good solvent that has a variety of applications, including the solvent of conductive salts suspended in electric capacitors, plasticizers, elastomers, synthetic waxes, separators of aromatic hydrocarbons and paraffins, detergents for cleaning equipment and machines, and The foam stabilizer obtained from the surfactant produced from soybeans is used in fire extinguishers and fire extinguishers. Ethylene glycol is used as a binder for foundry sand molding and as a lubricant for glass production and cement grinding. Wood treatment: Ethylene glycol is used to maintain and eliminate pests in wood. This product is used in museums when part of the wood rots.  Pen ink and ordinary ink: using ethylene glycol in ink increases the viscosity and reduces the volatility of the ink.  Explosive substance: ethylene glycol dinitrate (EGDN) is used in making dynamite suitable for cold weather, and it does this by lowering the freezing point of nitroglycerin. Monoethylene glycol with high purity and low conductivity is used as a solvent and suspending medium in electric capacitors. Due to its low volatility, excellent electrical properties and non-corrosion of aluminum, monoethylene glycol is suitable for this application.


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