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[Chemical Knowledge]：Propylene glycol manufacturing method and process flow

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Propylene glycol manufacturing method

1. Introduction

Propylene glycol is a widely used in the field of chemical production of raw materials, with excellent solvent properties and moisturizing properties, can be used in the production of coatings, inks, cosmetics and other products. This article will introduce the manufacturing method of propylene glycol, including raw material selection, process flow, equipment selection and so on.

2. raw material selection

propylene glycol manufacturing raw materials are mainly propylene oxide, water and catalyst. Among them, propylene oxide is the main carbon source and oxygen source, water is used as the hydrogen source, and the catalyst plays a role in accelerating the reaction. Factors such as purity, cost and availability should be considered when selecting raw materials.

3. Process

The manufacturing process of propylene glycol mainly includes the following steps:

1. Catalyst preparation: The catalyst is prepared into a solution according to a certain proportion for subsequent use.
2. Propylene oxide and water are mixed: Propylene oxide and water are mixed in a certain proportion to form a reaction material.
3. Reaction: The reaction materials are added into the reactor, and the addition reaction is carried out at a certain temperature and pressure to generate propylene glycol.
4. Separation and purification: Propylene glycol is separated from the reaction mixture by distillation, extraction and other methods, and purified to obtain propylene glycol products with high purity.

4. equipment selection

In the manufacturing process of propylene glycol, the equipment that needs to be used includes reactors, distillation columns, extractors, etc. When selecting equipment, factors such as equipment performance, reliability, operation and maintenance should be considered to ensure the smooth progress of the production process.

5. production control

In order to ensure the product quality and production efficiency of propylene glycol, it is necessary to control the production process comprehensively. Specifically, the following aspects need to be controlled:

1. Reaction temperature: The reaction temperature is an important factor affecting the yield and purity of propylene glycol, and it needs to be adjusted according to the actual situation.
2. Reaction pressure: The reaction pressure will also affect the progress of the reaction, which needs to be controlled according to the performance of the equipment and the requirements of the product.
3. The amount of catalyst added: The amount of catalyst added needs to be controlled within a certain range to ensure the progress of the reaction and the quality of the product.
4. The ratio of raw materials: The ratio of raw materials also needs to be adjusted according to the actual situation to ensure the progress of the reaction and the purity of the product.

6. Environmental protection and safe production

In the manufacturing process of propylene glycol, attention should be paid to environmental protection and safe production. Specifically, the following measures need to be taken:

1. Reduce waste emissions: In the production process, waste emissions should be reduced as much as possible, and waste should be properly disposed to avoid environmental pollution.
2. Strengthen equipment maintenance: regularly maintain and maintain production equipment to ensure the normal operation of equipment and prevent equipment failures from affecting production.
3. Comply with safety operation procedures: Operators should abide by safety operation procedures and wear protective equipment to avoid safety accidents.

7. conclusion

propylene glycol as an important chemical raw material has a wide range of applications in coatings, inks, cosmetics and other fields. This paper introduces the manufacturing method of propylene glycol, including raw material selection, process flow, equipment selection and so on. In the actual production process, it is necessary to pay attention to production control, environmental protection and safety production to ensure product quality and production efficiency.

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