Mason Delacroix
Ethane-1,2-diol, also known as ethylene glycol, is a compound with a variety of industrial applications. It is commonly used as an antifreeze and coolant in car engines, leveraging its ability to lower the freezing point of water and provide corrosion protection. Ethane-1,2-diol is produced through various methods, including the reaction of epoxyethane with water, oxidative carbonylation of methanol, and recycling of its polymeric derivatives. While it has proven useful in several industries, including automotive and explosives, understanding its chemical properties, such as its impact on freezing and boiling points, is crucial for safe and effective utilization.
| Characteristics | Values |
|---|---|
| Other Names | Ethylene glycol, monoethylene glycol, MEG |
| Manufacturing Process | Ethane-1,2-diol is manufactured from ethene via epoxyethane |
| Uses | Used to make polyester fibres, resins, films, coolants for engines, and antifreeze |
| Miscibility | Miscible with water |
| Freezing Point | When mixed with water, the freezing point of the mixture can go down to 223 K |
| Boiling Point | Ethane-1,2-diol has a higher boiling point than ethanol |
| Corrosion | When mixed with water, it prevents corrosion |
| Acid Degradation | It inhibits acid degradation |
| Microbes and Fungi | It inhibits the growth of most microbes and fungi |
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What You'll Learn
Ethane-1,2-diol is ethylene glycol
Ethane-1,2-diol, also known as ethylene glycol, monoethylene glycol, or MEG, is a chemical compound with a variety of industrial applications. It was first prepared by French chemist Charles-Adolphe Wurtz in 1856 through the treatment of ethylene iodide with silver acetate, followed by the hydrolysis of ethylene diacetate with potassium hydroxide. Wurtz named the compound "glycol" due to its similarities with both ethyl alcohol (with one hydroxyl group) and glycerin (with three hydroxyl groups).
One of the major uses of ethane-1,2-diol is in the production of polyester fibres, resins, and films. It is particularly important in the manufacture of PET (polyethylene terephthalate), which is widely used for clothing and packaging. Approximately 45% of polyester is used for bottles. Ethane-1,2-diol is also commonly used as a coolant in car engines. When mixed with water, it lowers the freezing point and increases the boiling point, making it an effective antifreeze agent. Additionally, it helps prevent corrosion and inhibits the growth of microbes and fungi.
The process of converting epoxyethane, derived from ethene, into ethane-1,2-diol has been further developed by Shell Chemicals, based on technology from Mitsubishi Chemicals. This process occurs in two stages, with the epoxide first reacting with carbon dioxide to form ethene carbonate. Ethane-1,2-diol is then formed when ethene carbonate reacts with water, simultaneously regenerating carbon dioxide. This two-stage process is surprisingly more cost-effective than a direct one-stage process.
Ethylene glycol is also produced from carbon monoxide in countries with large coal reserves and less stringent environmental regulations. It can be synthesized through the oxidative carbonylation of methanol to dimethyl oxalate, which can then be converted into ethylene glycol with high yields (94.7%) through hydrogenation using a copper catalyst. This method is advantageous as only carbon monoxide, hydrogen, and oxygen are consumed, as the methanol is recycled.
In summary, ethane-1,2-diol, commonly known as ethylene glycol, is a versatile chemical compound with applications in various industries, including textiles, automotive, and chemicals. Its unique properties, such as its ability to lower the freezing point of water, make it a valuable coolant and antifreeze agent, while its reactivity lends itself to the production of polyester and other derivatives.
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Ethylene glycol is used as antifreeze
Ethane-1,2-diol, also known as ethylene glycol, is a clear, viscous liquid primarily used in industrial manufacturing applications. It is a key ingredient in automotive antifreeze and coolant, helping to maintain a car's engine temperature by preventing it from freezing in cold climates and overheating in warm climates. This is due to ethylene glycol's desirable thermal properties, including a high boiling point, low freezing point, stability over a wide range of temperatures, high specific heat, and thermal conductivity.
The use of ethylene glycol as an antifreeze agent can be traced back to its development in the early 20th century. Initially, there was no commercial manufacture or application of ethylene glycol before World War I. However, during the war, it found a use as a substitute for glycerol in the explosives industry. The first large-scale commercial glycol plant was established in 1925 in South Charleston, West Virginia, marking the beginning of its widespread use.
As an antifreeze agent, ethylene glycol is mixed with water, typically in ratios of 30/70 or 35/65. This mixture lowers the freezing point of water and increases its boiling point, making it ideal for use in automobiles, air-conditioning systems, and geothermal heating/cooling systems. In automobiles, ethylene glycol-based antifreeze prevents engine damage that could be caused by water freezing or boiling within the engine. Additionally, it helps to prevent corrosion and inhibit the growth of microbes and fungi in the cooling system.
While ethylene glycol is effective as an antifreeze agent, it is important to handle it with care due to its toxicity. Ingesting ethylene glycol can be poisonous, and it has been linked to child deaths from acute kidney injury. As a result, many states and countries now require the addition of a bittering agent to antifreeze products to deter ingestion.
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Ethylene glycol is used in polyester production
Ethylene glycol, also known as ethane-1,2-diol, is a versatile compound with a range of applications. One of its significant uses is in the production of polyester, particularly in the form of polyethylene terephthalate (PET). This process involves reacting ethylene glycol with terephthalic acid or its dimethyl ester. The resulting PET is a type of polyester polymer widely used in textiles, packaging, and containers.
In the context of polyester production, ethylene glycol serves as a crucial raw material or precursor. It is an organic compound with the formula (CH2OH)2, which can be produced from ethylene (ethene) through an intermediate, ethylene oxide. The conversion of ethylene oxide to ethylene glycol can occur through hydration, catalysed by acids, bases, or elevated temperatures at a neutral pH. This process results in high yields of ethylene glycol, reaching up to 90% when an excess of water is used.
The polyester fibres created from ethylene glycol have a wide range of applications. They are used to make clothing that is resistant to wrinkling and can withstand frequent washing. Additionally, these fibres are used in the production of bed linens, carpets, and drapes. Beyond textiles, ethylene glycol-derived polyesters are used in packaging and containers, particularly for soft drinks. This application takes advantage of the polyester's ability to withstand high temperatures without warping or melting.
The use of ethylene glycol in polyester production also extends to the creation of polyester resins. These resins are important in the manufacturing of various plastic products, including bottles for soft drinks. The high boiling point and affinity for water exhibited by ethylene glycol make it particularly useful in this context. Furthermore, ethylene glycol is employed in the production of polyester films, which are used in applications such as photographic film and overhead transparencies.
In summary, ethylene glycol is a vital component in the production of polyesters, specifically PET. It serves as a raw material for creating polyester fibres, resins, and films. The resulting polyesters have a diverse range of applications, from textiles and packaging to containers and films. The unique properties of ethylene glycol, such as its ability to lower the freezing point of water and its high boiling point, contribute to its effectiveness in these applications.
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Ethylene glycol is manufactured from ethene
Ethylene glycol, also known as ethane-1,2-diol, is a clear, sweet, slightly viscous liquid that boils at 198 °C (388.4 °F). It is highly toxic to both animals and humans. Despite this, ethylene glycol has a wide variety of uses, including as an automotive antifreeze, an ingredient in hydraulic fluids, and a component in printing inks and paint solvents. It is also used in the manufacture of capacitors and vaccines, as well as in the treatment of rot and fungi in wooden objects.
The first preparation of ethylene glycol is attributed to French chemist Charles-Adolphe Wurtz in 1856. Wurtz treated ethylene iodide (1,2-Diiodoethane) with silver acetate and then hydrolyzed the resulting ethylene diacetate with potassium hydroxide. He named his new compound "glycol" due to its shared qualities with ethyl alcohol (one hydroxyl group) and glycerin (three hydroxyl groups). In 1859, Wurtz successfully prepared ethylene glycol through the hydration of ethylene oxide.
There was no commercial manufacture or application of ethylene glycol before World War I. It was first synthesized from ethylene dichloride in Germany during the war and used as a substitute for glycerol in the explosives industry. Semi-commercial production in the United States began in 1917 through ethylene chlorohydrin. The first large-scale commercial glycol plant was established in 1925 in South Charleston, West Virginia, by Carbide and Carbon Chemicals Co.
Today, ethylene glycol is produced from carbon monoxide in countries with abundant coal reserves and less stringent environmental regulations. The oxidative carbonylation of methanol to dimethyl oxalate is a promising approach, with dimethyl oxalate conversion to ethylene glycol yielding up to 94.7% with a copper catalyst. This method is employed in several plants in China, each with a production capacity of 200,000 tons per year. Additionally, ethylene glycol can be produced by recycling its polymeric derivatives, such as polyethylene terephthalate.
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Ethylene glycol has a high boiling point
Ethane-1,2-diol, also known as ethylene glycol, is a colourless, odourless, flammable, and viscous liquid with a sweet taste. It is toxic in high concentrations. Ethylene glycol is mainly used as a raw material in the manufacture of polyester fibres and for antifreeze formulations. It is also used as a coolant in car engines.
The high boiling point of ethylene glycol makes it useful as an antifreeze and coolant. When mixed with water, the freezing point of the mixture decreases to as low as −45 °C (−49 °F) for a mixture of 60% ethylene glycol and 40% water. This property is utilised in car engines, where higher running temperatures improve fuel efficiency and reduce emissions.
Ethylene glycol is produced from carbon monoxide in countries with large coal reserves and less stringent environmental regulations. It can also be produced by recycling its polymeric derivatives, such as polyethylene terephthalate. The global production of ethylene glycol was about 20 Mt in 2010, with several plants in China having a production capacity of 200,000 tons per year.
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Frequently asked questions
Ethane-1,2-diol, also known as ethylene glycol, monoethylene glycol, or MEG, is a chemical compound.
Ethane-1,2-diol is manufactured from ethene via epoxyethane, which reacts with water to form ethane-1,2-diol.
Ethane-1,2-diol is commonly used as an antifreeze and coolant in car engines. It is also used in the manufacture of polyesters, particularly PET (polyethylene terephthalate), which is widely used for clothing and packaging.
Ethane-1,2-diol has a higher boiling point than ethanol due to the presence of multiple OH functional groups, which facilitate the formation of hydrogen bonds between molecules.
No, ethane-1,2-diol is not a primary alcohol. It is classified as a diol, which contains two hydroxyl (OH) groups.
