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[Chemical Knowledge]：What are the upstream raw materials for polyester? What do the downstream products contain?

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Polyester is a widely used chemical product, mainly used in the production of fibers, films and packaging materials. In the field of chemical production raw materials, polyester upstream and downstream related products are quite abundant. This article will detail the upstream and downstream related products of polyester, including upstream raw materials, downstream products and by-products.

1. upstream raw material

1. Terephthalic acid (PTA)
Terephthalic acid is one of the main raw materials for the production of polyester, accounting for a large proportion of polyester production costs. PTA reacts with ethylene glycol through an esterification reaction to produce a polyester.
2. Ethylene Glycol (EG)
Ethylene glycol is another important raw material for the production of polyester, which reacts with terephthalic acid to produce polyester. Ethylene glycol is mainly produced by naphtha cracking to produce ethylene, which is then oxidized to produce ethylene oxide, and finally hydrolyzed to produce ethylene glycol.

2. downstream products

1. Polyester fiber (polyester)
Polyester fiber is the main downstream product of polyester, which has excellent physical and chemical properties, such as high strength, good elasticity, wear resistance, and corrosion resistance. Polyester is widely used in textiles, clothing, household goods and other fields.
2. Polyester film
Polyester film has excellent mechanical properties, electrical insulation properties, heat resistance, cold resistance and other characteristics, widely used in packaging, electronics, electrical, aviation and other fields.
3. Polyester bottle
polyester bottle is mainly used for the production of beverage bottles, food packaging bottles and other containers, with light weight, high strength, good transparency and so on.
4. Polyester chips
Polyester chips are important intermediate raw materials for the production of polyester fibers, polyester films and other products. They are further processed into final products by melt spinning or stretching.

3. by-product

1. Unsaturated polyester resin
unsaturated polyester resin is a polyester with unsaturated dibasic acid or diol reaction generated with unsaturated double bonds of high molecular compounds, can be used in the production of glass steel products, coatings, adhesives and so on.
2. Polyester waste
A certain amount of waste will be produced in the polyester production process, including waste silk, waste blocks, etc. These wastes can be recycled, reducing production costs and contributing to environmental protection.

In summary, the upstream and downstream related products of polyester are quite rich and involve many fields. With the continuous development of science and technology, the application field of polyester and its related products will be further expanded, injecting new vitality into the development of the chemical industry.

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