Monoethylene glycol

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Ethylene glycol

Ethylene glycol (glycol; 1,2-dioxetane; 1,2-ethanediol), HO—CH2—CH2—OH is the simplest representative polyhydric alcohols. Ethylene glycol is widely it is used as the heat carrier in systems of heating as the coolant in the system cooling in the production of automotive antifreeze, toolow, brake, hydraulic fluids. More glycol used in the manufacture synthetic fibers, resins, solvents, polyurethanes, explosives and fragrant substances in the leather and pharmaceutical industries.

In a purified form is a clear, colorless liquid slightly buttery consistency. The substance is odorless and has slightly sweet taste, while its use leads to death. Ethylene glycol (synonyms: monoethylene glycol, MEG) is the simplest diatomic alcohol and is a colorless viscous liquid, almost odorless. Water soluble, alcohol, acetone. In industry, the glycol get three main ways: by hydrolysis of ethylene chlorhydrin, hydrolysis dichloroethane and hydration of ethylene oxide. Currently, the latest method is the most widely used.

Ethylene glycol has different areas of application. The ethylene glycol used in the synthesis of important organic compounds, including polymers, as a solvent, and even in the production of inks and pastes for ballpoint pens. Examples of the use of ethylene glycol coolant in engines internal combustion heat carrier in systems of heating the cooling medium in cooling systems, defrost in aviation.

External 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 higher 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 a substance containing hydroxyl groups, ethylene glycol has similar properties Monohydric alcohols. When interacting with hydrohalic acids and a substitution of the hydroxyl group. According to GOST 19710-78 ethylene glycol, Packed in barrels, transporterowych in closed vehicles by all kinds of transport, as well as in rail tank cars.

Store 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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