Ethylene Glycol
Description of Ethylene Glycol
Ethylene Glycol is a widely used chemical compound, known primarily for its applications as an antifreeze and industrial coolant. Here is a detailed overview of ethylene glycol
EG is also known as glycol, 1,2-ethylene glycol, or EG for short. The chemical formula is (CH2OH)2, which is the simplest diol. EG is a colorless, odorless, sweet liquid with low toxicity to animals. Ethylene glycol is miscible with water and acetone, but its solubility in ethers is small. Used as solvent, antifreeze and raw material for synthetic polyester. Polyethylene glycol (PEG), a high polymer of ethylene glycol, is a phase transfer catalyst and is also used in cell fusion. EG is a colorless, odorless, sweet liquid with low toxicity to animals. Ethylene glycol can interdissolve with water and acetone, but it has less solubility in ethers. Used as a solvent, antifreeze, and a raw material for synthetic polyester. High glycol polyethylene glycol (PEG) is a phase transfer catalyst also used for cell fusion; its nitrate is an explosive.
Chemical Structure and Formula of EG
- Chemical Formula : C₂H₆O₂
- Structure : EG consists of two carbon atoms, each bonded to a hydroxyl group (OH). Its chemical structure is:
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Production Process of Ethylene Glycol
Ethylene glycol is produced through the hydration of ethylene oxide:[ text_2text_4text + text_2text rightarrow text_2text_6text_2 ] This reaction is typically carried out under acidic or basic conditions.
Key Uses Ethylene Glycol
- Antifreeze and Coolants :
– Automotive Industry : EG is the primary component in antifreeze formulations for automobile engines. It helps prevent freezing in cold temperatures and overheating in warm temperatures. - Industrial Applications :
– Coolants : Used in various cooling applications, including HVAC systems and industrial refrigeration.
– Hydraulic Fluids : Used in some hydraulic and brake fluids. - Chemical Intermediate :
– Polyester Production : EG is a key raw material in the production of polyethylene terephthalate (PET), used in making plastic bottles and polyester fibers. - Deicing Solutions :
– Aircraft Deicing : Used in deicing solutions for aircraft to prevent the formation of ice on surfaces. - Solvent :
– Inks and Dyes : Used as a solvent in the formulation of inks and dyes.
Industrial Applications and Concentrations
- Antifreeze Solutions : Typically used in concentrations of 30-70% in water, depending on the desired freezing point.
- Deicing Fluids : Used in varying concentrations, often mixed with water and other agents.
Properties EG
- Appearance : Colorless, odorless, and hygroscopic liquid.
- Boiling Point : 197.3°C (387.1°F).
- Melting Point : -12.9°C (8.8°F).
- Density : 1.1132 g/cm³ at 20°C.
- Viscosity : Moderately viscous.
- Solubility : Miscible with water, alcohols, and many organic solvents.
CHEMICAL PROPERTY EG
Because of the low molecular weight, active nature, it can be esterification, etherification, alcoholization, oxidation, acetal, dehydration and other reactions. Similar to ethanol, it can mainly react with inorganic or organic acids to produce esters. Generally, only one hydroxyl group reacts first. After increasing the temperature and increasing the amount of acid, both hydroxyl groups can form esters. If reacted with the nitric acid mixed with sulfuric acid, the dinitrate is formed. Acyl chloride or anhydride readily causes two hydroxyl groups to form esters. When ethylene glycol is heated under the action of catalyst (manganese dioxide, alumina, zinc oxide, or sulfuric acid), intra-molecular or intermolecular water loss may occur. EG can interact with alkali metals or alkali soil metals to form alcohol salts. When the metal is usually dissolved in the diol, only a single alcohol salt; if the alcohol salt (such as ethylene glycol monosodium) is heated in the hydrogen flow to 180~200 C, ethylene glycol disodium and EG can be formed. In addition, use ethylene glycol with 2mol sodium methanol to obtain ethylene glycol diodium. Didium glycol reacts with halogenanes to produce EG monoether or double ether. Disodium EG reacts with 1,2-dibromoethane to form a dioxygen ring. In addition, EG is also easy to oxidation, with the different oxidant or reaction conditions used, can produce various products, such as glycolaldehyde HOCH2CHO, glyoxal OHCCHO, glycolic acid HOCH2COOH, oxalate HOOCCOOH and carbon dioxide and water. EG, unlike other diols, can undergo carbon chain breakage upon periodate oxidation. Ethylene glycol is often used instead of glycerol. In the tanning and pharmaceutical industries, used as hydration and solvents, respectively. Dinitrate, a derivative of EG, is an explosive. Single ether or single ether of EG are good solvents, such as HOCH2CH2OCH3, a fiber-soluble fibers, resins, paints, and many other organic matter. Ethylene glycol has a strong dissolution capacity, but it is easy to metabolism and oxidation to produce toxic oxalic acid, so it cannot be widely used as a solvent.
PACKING STORAGE AND TRANSPORTATION
Package in galvanized iron barrels, 100 Kg or 200 Kg per barrel. Storage should be sealed, long-term storage to nitrogen sealing, moisture-proof, fireproof, anti-freezing. Storage and transport according to flammable chemicals.
Environmental Impact Ethylene Glycol
EG is toxic to humans and animals if ingested. It can cause serious health issues, including kidney failure and central nervous system depression. Spills should be managed to prevent contamination of water sources and soil.
Safety and Handling
- Toxicity : EG is toxic if ingested. It can cause nausea, vomiting, central nervous system depression, and potentially fatal kidney damage.
- Skin and Eye Contact : Prolonged contact with the skin can cause irritation. Eye contact can cause severe irritation.
- Inhalation : Inhalation of vapors can cause respiratory irritation.
- Storage : Should be stored in tightly closed containers in a cool, dry, and well-ventilated area, away from incompatible substances like strong oxidizers.
