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[Chemical Knowledge]：Production and manufacturing method and process flow of polyester chips

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Polyester chip is an important raw material for chemical production, which is widely used in plastics, fibers, films and other fields. The following is the manufacturing method of polyester chips:

1. raw material preparation

1. Terephthalic acid (PTA):PTA is the main raw material for the production of polyester chips. It is a white crystalline powder with a high melting point.
2. Ethylene glycol (EG): Ethylene glycol is another raw material for the production of polyester chips. It is a colorless and transparent liquid with good solubility and hygroscopicity.

2. Esterification Reaction

PTA and EG are added into an esterification reactor according to a certain molar ratio, and the esterification reaction is carried out under the action of a catalyst to produce diethyl terephthalate (BHET). The esterification reaction is an exothermic reaction, and the reaction temperature needs to be controlled, and the water generated by the reaction needs to be continuously discharged to promote the reaction.

3. polycondensation reaction

The BHET is transferred into the polycondensation reactor, and the polycondensation reaction is carried out under the conditions of high temperature and high vacuum degree to generate polyester polymer. Polycondensation reaction is a step-by-step polymerization process, and it is necessary to control the reaction temperature and vacuum degree in order to obtain polyester polymers with suitable molecular weight.

4. chip preparation

The polyester polymer produced by the polycondensation reaction is cut into slices of a certain length and thickness by a microtome to obtain a polyester chip product. The thickness and length of the slices can be adjusted according to production needs.

The above is the basic manufacturing method of polyester chips. The following points need to be paid attention to in the specific production process:

1. Catalyst selection: Both esterification and polycondensation reactions require the participation of catalysts, and different catalysts affect the reaction speed And product quality has different effects, so it is necessary to choose the appropriate catalyst according to production needs.
2. Control of reaction temperature: Both esterification and polycondensation reactions are exothermic reactions, and the reaction temperature needs to be controlled to avoid side reactions and product degradation.
3. Control of vacuum degree: The polycondensation reaction needs to be carried out under the condition of high vacuum degree to eliminate the low molecular by-products generated by the reaction and improve the product quality.
4. Control of raw material purity: The purity of PTA and EG has a great influence on product quality, so it is necessary to control the purity of raw materials to improve product quality.

In short, the manufacture of polyester chips requires strict control of various process parameters to ensure product quality and production efficiency.

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