乙二醇是一种化工上的一种大宗原料，别名是甘醇、1,2-亚乙基二醇，也可以简称EG。乙二醇外观是无色的液体，对动物有低毒性，乙二醇能与水、丙酮互溶，但在醚类中溶解度较小。用作溶剂、防冻剂以及合成涤纶的原料。乙二醇的高聚物聚乙二醇（PEG）是一种相转移催化剂，也用于细胞融合；其硝酸酯是一种炸药。

Ethylene glycol is a bulk raw material in chemical industry, also known as ethylene glycol, 1,2-ethylene glycol, or EG for short. Ethylene glycol is a colorless liquid with low toxicity to animals. It can dissolve in water and acetone, but has a lower solubility in ethers. Used as a solvent, antifreeze, and raw material for synthesizing polyester. Polyethylene glycol (PEG), a high polymer of ethylene glycol, is a phase transfer catalyst and is also used for cell fusion; Its nitrate ester is an explosive.

乙二醇的作用：主要用于制聚酯，涤纶，聚酯树脂、吸湿剂，增塑剂，表面活性剂，合成纤维、化妆品和炸药，并用作染料、油墨等的溶剂、配制发动机的抗冻剂，气体脱水剂，制造树脂、也可用于玻璃纸、纤维、皮革、粘合剂的湿润剂。可生产合成树脂PET，纤维级PET即涤纶纤维，瓶片级PET用于制作矿泉水瓶等。还可生产醇酸树脂、乙二醛等，也用作防冻剂。除用作汽车用防冻剂外，还用于工业冷量的输送，一般称呼为载冷剂，同时，也可以与水一样用作冷凝剂。

The function of ethylene glycol: It is mainly used in the production of polyester, polyester, polyester resins, hygroscopics, plasticizers, surfactants, synthetic fibers, cosmetics, and explosives. It is also used as a solvent for dyes, inks, etc., as an antifreeze for engines, a gas dehydrating agent, and in the manufacturing of resins. It can also be used as a wetting agent for glass paper, fibers, leather, and adhesives. It can produce synthetic resin PET, fiber grade PET or polyester fiber, and bottle grade PET for making mineral water bottles, etc. It can also produce alkyd resin, glyoxal, etc., and be used as an antifreeze. In addition to being used as an antifreeze for automobiles, it is also used for the transportation of industrial cooling capacity, commonly referred to as a refrigerant, and can also be used as a condensing agent like water.

乙二醇

ethylene glycol

乙二醇甲醚系列产品是性能优良的有机溶剂，作为印刷油墨、工业用清洗剂、涂料（硝基纤维漆、清漆、瓷漆）、覆铜板、印染等的溶剂和稀释剂；可以作生产农药中间体、医药中间体以及合成制动液等化工产品的原料；作为电解电容器的电解质、制革化纤染剂等。用作纺织助剂，合成液体染料、以及化肥和炼油生产中的脱硫剂的原料等。

The ethylene glycol methyl ether series products are high-performance advanced organic solvents, used as solvents and diluents for printing inks, industrial cleaning agents, coatings (nitrocellulose paint, varnish, enamel), copper-clad panels, printing and dyeing, etc; Can be used as raw materials for the production of pesticide intermediates, pharmaceutical intermediates, and synthetic brake fluids and other chemical products; As an electrolyte for electrolytic capacitors, a dyeing agent for leather and chemical fibers, etc. Used as a textile additive, synthetic liquid dye, and raw material for desulfurizers in fertilizer and oil refining production.

乙二醇在用做载冷剂时应该注意：

When using ethylene glycol as a refrigerant, attention should be paid to:

1.其冰点随着乙二醇在水溶液中的浓度变化而变化，浓度在60%以下时，水溶液中乙二醇浓度升高冰点降低，但浓度超过60%后，随着乙二醇浓度的升高，其冰点呈上升趋势，粘度也会随着浓度的升高而升高。当浓度达到99.9%时，其冰点上升-13.2℃，这就是浓缩型防冻液（防冻液母液）为什么不能直接使用的一条重要原因，必须引起使用者的注意。

1. Its freezing point changes with the concentration of ethylene glycol in the aqueous solution. When the concentration is below 60%, the concentration of ethylene glycol in the aqueous solution increases and the freezing point decreases. However, when the concentration exceeds 60%, the freezing point shows an upward trend with the increase of ethylene glycol concentration, and the viscosity also increases with the increase of concentration. When the concentration reaches 99.9%, its freezing point rises to -13.2 ℃, which is an important reason why concentrated antifreeze (antifreeze mother liquor) cannot be used directly and must be taken seriously by users.

2.乙二醇含有羟基，长期在80摄氏度-90℃下工作，乙二醇会先被氧化成乙醇酸，再被氧化成草酸，,即乙二酸（草酸），含有2个羧基。草酸及其副产物会先影响神经系统，接着是心脏，而后影响肾脏。乙二醇乙二酸，对设备造成腐蚀而使之渗漏。因此，在配制的防冻液中，还必须有防腐剂，以防止对钢铁、铝的腐蚀和水垢的生成。

2. Ethylene glycol contains hydroxyl groups. When working at temperatures between 80 ° C and 90 ° C for a long time, ethylene glycol is first oxidized to glycolic acid, which is then oxidized to oxalic acid, also known as oxalic acid, containing two carboxyl groups. Oxalic acid and its by-products first affect the central nervous system, followed by the heart, and then affect the kidneys. Ethylene glycol ethylene glycol diacid causes corrosion to equipment and leads to leakage. Therefore, anti-corrosion agents must also be included in the prepared antifreeze to prevent corrosion of steel and aluminum, as well as the formation of scale.