[Chemical Knowledge]：Properties, uses, upstream and downstream raw materials, storage methods, characteristics of diethylene glycol

Diethylene Glycol Properties

Diethylene glycol (Diethylene Glycol, DEG), the chemical formula is C4H10O3, is a colorless, odorless, hygroscopic viscous liquid. It has a molecular weight of 106.12g/mol, a melting point of about -10°C, a boiling point of 245°C and a density of 1.118g/cm³. Diethylene glycol is completely miscible with organic solvents such as water, alcohols, ethers and acetone. Due to its high boiling point and good solubility, diethylene glycol has important application value in industrial and chemical synthesis.

Diethylene Glycol Uses

Solvent

Diethylene glycol is widely used as a solvent, especially in the manufacture of paints, coatings, inks and resins. Due to its good dissolving ability, it can effectively dissolve various resins and paint components, and improve the uniformity and stability of the product.

Antifreeze and Refrigerants

Diethylene glycol is also used in the formulation of antifreeze and refrigerants. It has low volatility and high boiling point, which enables it to provide good performance in low and high temperature environments. Its hygroscopicity also helps to prevent the formation of ice crystals inside the system, improving the operating efficiency and life of the equipment.

chemical synthesis

In the field of chemical synthesis, diethylene glycol is an intermediate for many chemicals. For example, it is an important raw material for the production of polyester resins, polyurethanes and plasticizers. Through the reaction with other chemicals, diethylene glycol can produce a variety of functional products, widely used in plastics, textiles, coatings and other industries.

Other uses

Diethylene glycol is also used as a tobacco humectant, a stabilizer in the paper industry, and a solvent and pharmaceutical intermediate in the pharmaceutical industry. Its versatility and wide application make it indispensable in many fields.

Diethylene glycol upstream and downstream raw materials

Upstream raw materials

The production of diethylene glycol mainly uses the oxidation process of ethylene glycol (Ethylene Glycol, abbreviated as EG). Ethylene glycol is an important chemical raw material, which is produced by ethylene oxidation hydration or ethanol dehydration. Ethylene glycol and oxygen are oxidized in the presence of a catalyst to produce ethylene glycol and its by-products diethylene glycol and triethylene glycol. Through separation and purification, diethylene glycol is extracted and further processed for industrial use.

Downstream Products

As an intermediate, diethylene glycol is widely used in the production of polyester resin, polyurethane, plasticizer and other products. For example, diethylene glycol reacts with phthalic anhydride in the synthesis of polyester resins to produce a variety of polyester products used in the manufacture of fibers, films and bottles. Diethylene glycol is also used in the production of polyurethane foams, elastomers and coatings, providing excellent physical and chemical properties.

Diethylene glycol storage method

Temperature control

Since diethylene glycol has a high boiling point and hygroscopicity, its storage requires attention to temperature control. In general, diethylene glycol should be stored in a cool, dry and well-ventilated environment, away from direct sunlight and high temperature to prevent its decomposition and moisture absorption.

Container Selection

Diethylene glycol is corrosive to metal containers, so containers lined with anti-corrosion materials should be used for storage. For example, stainless steel or galvanized steel containers are preferred. Plastic containers such as polyethylene or polypropylene containers can also be used to store diethylene glycol, but it is necessary to ensure that they have good sealing properties to prevent liquid leakage and moisture absorption.

Fire prevention measures

Although diethylene glycol has low flammability, necessary fire prevention measures should be taken. In the storage area, suitable fire extinguishing equipment, such as dry powder fire extinguishers, foam fire extinguishers, etc., shall be provided. Avoid mixing with flammable substances to ensure the safety of the storage environment.

Environmental protection

Diethylene glycol has a certain impact on the environment, so care should be taken to avoid leakage and pollution during storage and transportation. The storage area should be equipped with anti-leakage facilities, such as anti-leakage tanks and anti-leakage mats, to prevent diethylene glycol from entering the soil and water bodies and causing environmental pollution. During transportation, special transportation tools and containers should be used to avoid mixing with food and daily necessities.

Conclusion

Diethylene glycol is a kind of chemical with wide application and important industrial value. Its unique physical and chemical properties make it play an irreplaceable role in solvents, antifreeze, chemical synthesis and other fields. Through reasonable upstream raw material selection and efficient production process, diethylene glycol can meet the market demand and promote the development of related industries. Scientific storage and management methods can ensure its safe use and reduce environmental impact. With the continuous progress of chemical technology, diethylene glycol will continue to play an important role in the future, helping the innovation and development of all walks of life.