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[Chemical Knowledge]：PP-H manufacturing methods and processes.

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PP-H (homopolypropylene) is a kind of raw material widely used in the field of chemical production, because of its excellent heat resistance, chemical resistance and mechanical properties. This article will detail the manufacturing method of the PP-H.

1. Raw Material Preparation

1. Propylene: Propylene is the main raw material for the production of PP-H, requiring high purity, generally more than 99.5%.
2. Catalyst: Catalyst is a key component in the production of polypropylene, and titanium or magnesium catalysts are usually used.
3. Co-catalyst: Co-catalyst is used to improve the activity of the catalyst, and the commonly used co-catalyst is aluminum chloride.

2. polymerization reaction

1. Pretreatment: propylene, catalyst and cocatalyst are added to the preconditioner in a certain proportion, mixed and preheated.
2. Polymerization: The pretreated mixture is fed into a polymerization reactor, and the polymerization reaction is carried out under suitable temperature and pressure conditions to produce polypropylene.
3. Flash evaporation: After the polymerization, the unreacted propylene and catalyst residues are separated from the polypropylene by flash evaporation.

3. granulation and packaging

1. granulation: after flash evaporation of polypropylene powder, in order to facilitate transportation and processing, it needs to be granulated into a certain particle size particles.
2. Packaging: The granulated polypropylene particles are packaged, usually in plastic bags or paper bags.
Precautions for
4.

1. Strictly control the quality of raw materials to ensure product purity.
2. During the polymerization reaction, proper temperature and pressure should be maintained to ensure the smooth progress of the reaction.
3. Granulation process to control the particle size, in order to ensure the processing performance of the product.
4. Pay attention to safety and abide by relevant operating procedures in the production process.

In short, the PP-H manufacturing method involves multiple links and precautions. In order to ensure product quality and production safety, it is necessary to strictly control the process parameters and operating procedures of each link. Through scientific manufacturing methods, we can produce high-quality PP-H products and provide high-quality raw materials for chemical production.

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