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[Chemical Knowledge]：Production and manufacturing method and process flow of PTMEG polyether polyol

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PTMEG (Poly (Tetrahydrofuryl ether glycol)) is an important chemical raw material, which is widely used in polyurethane, elastomer, cellulose, polymer and other fields. A method of manufacturing the PTMEG will be described below.

1. Raw Material Preparation

1. Tetrahydrofuran (THF): As the main raw material of PTMEG, tetrahydrofuran needs to be refined to remove moisture, impurities, etc.
2. Catalyst: Generally, an acidic catalyst such as sulfuric acid, hydrochloric acid and the like is used.

2. The polymerization reaction
is
in a polymerization reactor, and the purified tetrahydrofuran is mixed with the catalyst and heated to a certain temperature to initiate the polymerization reaction. During the polymerization reaction, it is necessary to control the reaction temperature and pressure to keep the reaction smoothly. At the same time, it is necessary to constantly monitor the viscosity and molecular weight of the reaction liquid to determine the progress of the reaction.

3. post-treatment
After the
reaction is completed, post-treatment is required, including neutralization, dehydration, purification and other steps, to remove impurities such as catalyst, unreacted tetrahydrofuran and the like, to obtain a PTMEG product with high purity. The specific manufacturing method of the

is as follows:

1. Refining tetrahydrofuran: Tetrahydrofuran is added into a refining kettle, heated to a certain temperature, and protected by nitrogen to remove moisture and impurities.
2. Polymerization: Add the purified tetrahydrofuran and catalyst into a polymerization reactor, heat to a certain temperature, and start the polymerization reaction. It is necessary to control the temperature and pressure during the reaction to keep the reaction stable. At the same time, it is necessary to constantly monitor the viscosity and molecular weight of the reaction liquid to determine the progress of the reaction.
3. Neutralization post-treatment: After the reaction is completed, the reaction solution is transferred to a neutralization kettle, and an alkaline absorbent is added to neutralize the catalyst. A dehydration treatment is then carried out to remove residual water and unreacted tetrahydrofuran. Finally, the PTMEG product with high purity was obtained by refining treatment.

in the manufacturing process, need to pay attention to the following matters:

1. Control the temperature and pressure of the polymerization reaction to avoid explosion, leakage and other safety accidents.
2. In the post-processing process, to ensure the purity and quality of the product, to avoid excessive impurities and other issues.
3. In the manufacturing process, attention should be paid to environmental protection, energy conservation and emission reduction, and the emission of waste and pollutants should be reduced.

In short, the manufacturing method of PTMEG needs to go through multiple steps and links, and the reaction conditions and post-treatment process need to be strictly controlled to ensure the quality and purity of the product. At the same time, it is also necessary to pay attention to the requirements of environmental protection and energy conservation and emission reduction to promote the sustainable development of chemical production.

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