Ethylene glycol is also known as “glycol” and “1,2-ethylene glycol”, referred to as EG. It is the simplest glycol. Ethylene glycol is a colorless, odorless, sweet liquid that is toxic to animals. The lethal dose for humans is about 1.6 g/kg. 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 polymer of ethylene glycol, is a phase transfer catalyst and is also used in cell fusion.
Purpose
Ethylene glycol is mainly used to make polyester polyester, polyester resin, hygroscopic agents, plasticizers, surfactants, synthetic fibers and cosmetics, and is used as a solvent for dyes, inks, etc., and to prepare antifreeze for engines. Gas dehydrating agent, used in manufacturing resins, and can also be used as a wetting agent for cellophane, fiber, leather, and adhesives. It can produce synthetic resin PET, fiber grade PET is polyester fiber, and bottle flake grade PET is used to make mineral water bottles, etc. It can also produce alkyd resin, glyoxal, etc., and is also used as antifreeze. In addition to being used as antifreeze for automobiles, it is also used for the transportation of industrial cold energy. It is generally called a refrigerant. At the same time, it can also be used as a condensing agent like water.
Ethylene glycol methyl ether series products are high-grade organic solvents with excellent performance, used as solvents and diluents for printing inks, industrial cleaning agents, coatings (nitrocellulose paint, varnish, enamel), copper-clad laminates, printing and dyeing, etc.; It can be used as raw material for the production of pesticide intermediates, pharmaceutical intermediates, synthetic brake fluid and other chemical products; as electrolyte for electrolytic capacitors, leather-making chemical fiber dyes, etc. It is used as textile auxiliaries, synthetic liquid dyes, and raw materials for desulfurizers in fertilizer and oil refining production.
When using ethylene glycol as a refrigerant, you should pay attention to:
1. Its freezing point changes with the concentration of ethylene glycol in the aqueous solution. When the concentration is below 60%, the freezing point decreases as the concentration of ethylene glycol in the aqueous solution increases. However, after the concentration exceeds 60%, the freezing point decreases with the concentration of ethylene glycol. As the alcohol concentration increases, its freezing point tends to increase, and the viscosity also increases with the increase in concentration. When the concentration reaches 99.9%, its freezing point rises to -13.2°C. This is an important reason why concentrated antifreeze (antifreeze mother liquor) cannot be used directly and must attract the attention of users. Preservatives must also be included in the prepared antifreeze to prevent corrosion of steel and aluminum and the formation of scale.
