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[Chemical Knowledge]：HDI manufacturing methods and processes.

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HDI (hexamethylene diisocyanate) is an important chemical raw material, widely used in polyurethane coatings, elastomers, adhesives and other fields. The following is a manufacturing method of HDI, for reference only. The specific manufacturing process needs to be adjusted and optimized according to the actual situation.

1. raw material preparation

1. prepare phosgene, diamine, catalyst and other raw materials.

2. Reaction Process

1. The diamine is mixed with the catalyst and added to the reactor.

2. at a certain temperature, into the phosgene reaction.

3. Control the reaction temperature and time to ensure that the reaction produces HDI.

4. After completion of the reaction, post-treatment was carried out to obtain a pure HDI product.

3. equipment selection

1. Select the high quality reactor and stirring equipment to ensure that the reaction process is uniform and stable.

2. Select the appropriate thermometer, pressure gauge and other monitoring equipment to accurately control the reaction process.

4. safety and environmental protection measures

1. In the manufacturing process, strictly abide by the safety operation procedures to ensure the safety of employees and equipment.

2. Strengthen the environmental protection treatment of waste gas and waste water to reduce the impact on the environment.

5. Quality Control

1. Strict quality testing of raw materials to ensure that the quality of raw materials meet the requirements.

2. During the manufacturing process, regular product quality inspections are carried out to ensure stable and reliable product quality.
The above
is a manufacturing method of HDI, and the specific manufacturing process needs to be adjusted and optimized according to the actual situation. At the same time, pay attention to safety and environmental protection during the manufacturing process, strictly control product quality, and ensure product stability and reliability.

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