Ethylene glycol

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Ethylene glycol

Ethylene glycol (glycol; 1,2-doxey, 1,2-ethanol), HO-CH2-CH2-OH, - easiest representative polyhydric alcohols. Ethylene glycol is widely used as the heat carrier in systems of heating as the cooling medium in cooling systems, the manufacture of automotive coolants, antifreeze, brake and hydraulic fluids. More glycol used in the production of synthetic fibres, resins, solvents, polyurethanes, explosives, dyes, leather and the pharmacological industry.

In purified the form is a clear, colourless liquid, slightly oily consistency. The substance is odorless and has slightly sweet taste, while its use fatal. Ethylene glycol (synonyms: monoethylene glycol, Meg) dautomne is the simplest alcohol and is a colorless viscous liquid, almost odorless. Soluble in water, alcohol, acetone. In industry, ethylene glycol is produced by the following main ways: hydrolysis of ethyl-chlorin, the hydrolysis of dichloroethane and hydration of ethylene oxide. In now the last method is the most widely used.

Ethylene glycol has various areas of application. The ethylene glycol used in the synthesis of important organic compounds, including polymers, as a solvent and even in the production inks and pastes for ballpoint pens. Interesting application of ethylene glycol is found in quality low Freezable liquid (antifreeze). He replaces the water, where the water is not "cope", not only because of the lower temperature freezing point but a higher boiling point. Examples of usage ethylene glycol coolant in the internal combustion engine, coolant in heating systems and heating the cooling medium in cooling systems, icing in aviation.

Appearance: colorless viscous liquid. The contents of ethylene glycol according to GOST 19710-78 - 99% for the highest grade and 98.5% for first grade. Mass fraction of diethylene glycol - not more than 0.1% for the highest grade. Mass fraction of water not more than 0.1%. Density: 1.13 g / cm3, the freezing temperature of 17.5 ° C, a boiling point of + 197 ° C. As substance containing hydroxyl groups, ethylene glycol has similar properties with Monohydric alcohols. When interacting with halogenorganic acids occurs substitution of hydroxyl groups. The ethylene glycol should be packaged only in aluminum drums or barrels made of corrosion-resistant steel. According to GOST 19710-78 ethylene glycol, Packed in barrels, transporterowych in covered vehicles all types of transport, and in rail tank cars.

Keep in barrels in covered unheated warehouses. Ethylene glycol is toxic. Not to avoid getting into the body. Maximum permissible concentration in the air of the working zone 5 mg / m3. Belongs to the third class of hazard, GOST 12.1.005. Due to the low vapor pressure does not cause acute poisoning if inhalation.

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