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[Chemical Knowledge]：Manufacturing method and process of CASE polyether polyol

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The manufacturing method
of CASE polyether polyol
CASE polyether polyol is an important raw material for chemical production, which is widely used in polyurethane foam, coating, adhesive and other fields. This article will introduce the manufacturing method of CASE polyether polyol, including raw material preparation, polymerization reaction, post-treatment and other steps.

1. raw material preparation

1. Ethylene oxide: Ethylene oxide is the main raw material for the preparation of polyether polyols, and its quality has a great influence on the performance of the final product. Therefore, it is necessary to select ethylene oxide having high purity and low water content.
2. Starter: Starter is the key raw material in the synthesis of polyether polyol. Commonly used starters include polyols, amines, etc. Different starters affect the molecular structure and properties of polyether polyols.
3. Catalyst: A catalyst is added during the polymerization reaction to promote the reaction of ethylene oxide with the initiator. Commonly used catalysts are alkaline catalysts and acidic catalysts.

2. polymerization reaction

1. premixing: the starting agent, catalyst and part of ethylene oxide mixing, stirring evenly.
2. Polymerization: The premixture is added to the polymerization kettle, the remaining ethylene oxide is introduced, and a certain temperature and pressure are controlled to carry out the polymerization reaction. During the polymerization process, the progress of the reaction needs to be continuously monitored to ensure that the molecular weight and hydroxyl value of the product are in line with expectations.
3. Post-treatment: After the polymerization reaction, post-treatment is required, including neutralization, dehydration, filtration and other steps, to obtain high-quality polyether polyol products.

3. Influencing Factors and Control

1. Temperature: The temperature of the polymerization reaction will affect the reaction rate and the molecular weight of the product. Generally speaking, an appropriate increase in temperature is beneficial to speed up the reaction rate, but too high temperature will lead to increased side reactions and affect product quality. Therefore, it is necessary to control the reaction temperature according to the actual situation.
2. Pressure: The pressure of the polymerization reaction also affects the reaction rate and product molecular weight. Appropriately increasing the pressure is beneficial to accelerate the reaction rate, but too high pressure will increase the equipment cost and operation difficulty. Therefore, it is necessary to select the appropriate pressure according to the equipment conditions and product requirements.
3. Type and amount of catalyst: Different types of catalysts have different effects on the polymerization reaction. Choosing the appropriate catalyst and amount can improve the reaction rate and product quality.
4. Raw material purity: The purity of raw materials has a great influence on product quality, and it is necessary to choose raw materials with high purity.

4. product quality inspection

In order to ensure the product quality of CASE polyether polyol, it is necessary to conduct a comprehensive quality inspection of the product, including molecular weight, hydroxyl value, acid value, moisture and other indicators. At the same time, it is also necessary to test the application performance of the product to ensure the applicability of the product in different fields.

In short, the manufacturing method of CASE polyether polyols requires strict control of the process parameters and raw material quality of each link to ensure the performance and quality of the final product.

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