A Brief Introduction to the Classification and Use of Ethylene Glycol Ethylene glycol (EG) is widely used. In ordinary times, ethylene glycol (EG) can be found in liquor. The following price of ethylene glycol will introduce the classification and use of ethylene glycol. Ethylene glycol is divided into polyester grade and industrial grade. The content of polyester grade Ethylene glycol reaches 99.9, and the general content of industrial grade Ethylene glycol is 98. The quality of Ethylene glycol is quite good. It is used for antifreeze and pipeline refrigeration, air conditioning is added specially, 230KG per barrel. It is mainly used to make polyester, polyester resin, hygroscopicity agent, plasticizer, surfactant, synthetic fiber, cosmetics and explosives, as solvents for dyes and inks, antifreeze agent for engine, gas dehydrating agent, resin, wetting agent for cellophane, fibre, leather and adhesives. It can produce synthetic resin PET. Fiber grade PET is polyester fiber. Bottle grade PET is used to make mineral water bottles. It can also produce alkyd resin, glyoxal, etc., and also be used as antifreeze. Apart from being used as an antifreeze for automobiles, it is also used for conveying industrial cooling capacity, commonly called as refrigerant carrier, and can also be used as a condensant as water. Ethylene glycol methyl ether series products are high-grade organic solvents with excellent performances. They are used as solvents and diluents for printing ink, industrial cleaners, coatings (nitrocellulose paint, varnish, enamel paint), copper clad laminates, printing and dyeing, etc. They can be used as raw materials for chemical products such as pesticide intermediates, pharmaceutical intermediates and synthetic brake fluids, as electrolytes for electrolytic capacitors, chemical fibre dyeing agents for leather making, etc. Used as textile auxiliaries, synthetic liquid dyes, and raw materials for desulfurizers in fertilizer and oil refining production. When using ethylene glycol as refrigerant, we should pay attention to: 1. The freezing point varies with the concentration of ethylene glycol in aqueous solution. When the concentration is below 60%, the freezing point decreases with the increase of ethylene glycol concentration. But when the concentration exceeds 60%, the freezing point increases with the increase of ethylene glycol concentration, and the viscosity increases with the increase of concentration. When the concentration reaches 99.9%, the freezing point rises to - 13.2 C, which is an important reason why concentrated antifreeze (antifreeze mother liquor) can not be used directly. It must be noticed by users. 2. Ethylene glycol contains hydroxyl groups. It works at 80-90 degrees Celsius for a long time. Ethylene glycol is oxidized to glycolic acid first, then oxalic acid, that is, oxalic acid, which contains two carboxyl groups. Oxalic acid and its byproducts affect the central nervous system, then the heart, and then the kidney. Excessive intake of ethylene glycol can lead to death without proper treatment. Ethylene glycol glycolic acid, which causes leakage due to corrosion of equipment. Therefore, in the preparation of antifreeze solution, there must also be preservatives to prevent corrosion of steel and aluminium and scale formation.