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[Chemical Knowledge]：Production method and process of polyether

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The manufacturing method
of polyether
1. Introduction

polyether is a kind of important chemical production raw materials, widely used in polyurethane, surfactant, lubricant additives and other fields. With the continuous development of science and technology, the manufacturing method of polyether has been continuously improved and optimized. This paper will introduce the manufacturing method of polyether in detail, including raw material preparation, polymerization reaction, post-treatment and other steps, in order to provide some guidance for the production of polyether.

2. raw material preparation

1. starting agent: commonly used starting agent with dihydric alcohol, trihydric alcohol, such as ethylene glycol, propylene glycol, glycerin and so on. The choice of starter has a great influence on the performance of polyether, so it is necessary to select a suitable starter according to the product use.
2. Ethylene oxide: Ethylene oxide is the main raw material for polyether production, with high activity, can occur with the starter ring-opening polymerization reaction.
3. catalysts: catalysts commonly used in the production of polyether are alkali metal compounds and organic metal compounds, such as potassium hydroxide, sodium ethoxide, etc. The role of the catalyst is to reduce the activation energy of the polymerization reaction and accelerate the reaction rate.

3. polymerization reaction

polymerization reaction is the key step of polyether production, mainly includes the following stages:

1. Initiation stage: under the action of the initiator, the initiator reacts with ethylene oxide to generate active intermediates.
2. Chain Growth Stage: Reactive intermediates continue to react with ethylene oxide to produce high molecular weight polyethers.
3. Chain termination stage: When the molecular weight of the polyether reaches a certain level, the active intermediate loses its activity and the polymerization reaction is terminated.

In the polymerization process, it is necessary to strictly control the reaction temperature, pressure, catalyst dosage and other factors to ensure the stability of the molecular weight and molecular weight distribution of polyether. At the same time, it is necessary to design and maintain the reaction equipment reasonably to ensure the safe and stable operation of the equipment.

4. post-treatment
After completion of the
polyether production, post-treatment is required to obtain the final product. The post-treatment mainly includes the following steps:

1. neutralization: the catalyst is neutralized with an acidic substance to remove the basic component therein. Commonly used acidic substances are sulfuric acid, hydrochloric acid and so on.
2. Dehydration: the water in the polyether is removed by distillation or vacuum drying to improve the purity of the product.
3. Filtration: Use a filter to remove impurities and insoluble materials in the polyether.
4. Packaging: The polyether shall be packaged in accordance with the specified requirements for easy transportation and storage.
Precautions for
5.

1. Safety first: In the polyether production process, it is necessary to strictly abide by the safety operation procedures to ensure the safety of employees and equipment.
2. Quality control: It is necessary to carry out comprehensive quality control on the polyether production process, including raw material inspection, process monitoring, product inspection and other links to ensure stable and reliable product quality.
3. Environmental protection requirements: In the production process, it is necessary to strengthen the treatment and emission control of pollutants such as waste gas and waste water to meet environmental protection requirements.

6. conclusion

polyether as a kind of important chemical production raw materials, its manufacturing method involves the control of many links and factors. Through reasonable raw material preparation, polymerization reaction and post-treatment steps, high-quality and high-performance polyether products can be produced. At the same time, it is necessary to strengthen the management and control of safety, quality and environmental protection in the production process to ensure the smooth progress of production and the quality and reliability of products.

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