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[Chemical Knowledge]：Manufacturing method and process of polyester polyester

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The manufacturing method
of polyester polyester
1. Introduction

polyester polyester is a widely used raw material for the production of chemical products. It has excellent physical and chemical properties, such as high strength, good abrasion resistance, and strong wrinkle resistance. Therefore, polyester polyester has been widely used in textiles, clothing, plastics, films and other fields. This article will introduce the manufacturing method of polyester polyester in detail, including raw material preparation, polymerization reaction, spinning, post-processing and other steps.

2. Raw Material Preparation
The manufacture of
polyester polyester requires a large amount of raw materials, mainly including terephthalic acid (PTA) and ethylene glycol (EG). The ratio of these two raw materials is generally 1:1, and the molar ratio is 1. In order to ensure the smooth progress of production, raw materials must undergo strict quality inspection and purification treatment to ensure that their purity and quality meet production requirements.

3. Polymerization
The manufacturing process of
polyester polyester is mainly realized by polymerization. Specifically, PTA and EG are subjected to a polycondensation reaction at high temperature and high pressure under the action of a catalyst to produce a polyester (PET) polymer compound. The polymerization reaction generally adopts a continuous polymerization method. The raw materials enter from the bottom of the reactor, and the product is discharged from the top. By controlling the reaction temperature and pressure, polyester products with moderate molecular weight and uniform distribution can be obtained. Polyester products obtained

4. spinning

polymerization must be spun to become polyester fibers. During the spinning process, the polyester melt passes through a spinneret to form filaments, which are then cooled and solidified in air to form polyester fibers. The key to the spinning process is to control the aperture of the spinneret and the spinning speed to ensure the diameter and strength of the fiber.

5. post-treatment
The polyester fiber obtained by
spinning also needs post-treatment, including stretching, heat setting, crimping and other steps, in order to improve the physical properties and appearance quality of the fiber. Stretching can make the fiber molecular chain orientation, improve the strength and elasticity of the fiber; heat setting can eliminate the internal stress of the fiber, improve the dimensional stability; crimp can increase the cohesion of the fiber, improve the warmth and elasticity of the textile.

6. environmental protection and sustainable development

With the improvement of environmental awareness and sustainable development requirements, the manufacturing process of polyester must also consider environmental protection and sustainable development issues. First of all, it is necessary to reduce the discharge of waste and pollutants in the production process, and adopt environmental protection technology and equipment to achieve clean production. Secondly, it is necessary to improve the efficiency of resource utilization and adopt a circular economy model to realize the recycling of resources. Finally, it is necessary to strengthen product research and development and innovation, develop environmentally friendly, degradable polyester products, and contribute to sustainable development.

7. Conclusion The manufacturing method of

polyester polyester includes the steps of raw material preparation, polymerization reaction, spinning and post-treatment. In order to ensure product quality and production efficiency, the process parameters and operating conditions of each step must be strictly controlled. At the same time, it is necessary to strengthen the awareness of environmental protection and sustainable development, adopt environmental protection technology and circular economy model, improve the utilization efficiency of resources, reduce the discharge of waste and pollutants, and contribute to the realization of green chemical production.

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