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[Chemical Knowledge]：DINP production and manufacturing methods and processes.

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DINP (diisononyl phthalate) is a common plastic plasticizer, which is widely used in chemical production. The following is the manufacturing method of DINP:

1. Raw material preparation

1. Phthalic anhydride: Phthalic anhydride is the main raw material of DINP, which can be prepared by the reaction of phthalic anhydride and nitric acid.
2. Isononanol: Isononanol is another raw material for DINP and can be produced by cracking petrochemical feedstocks.

2. esterification reaction

phthalic anhydride and isononyl alcohol are added into a reaction kettle according to a certain proportion, and heated to a certain temperature for esterification reaction. The temperature and pH need to be controlled during the reaction to ensure the smooth progress of the reaction. After completion of the reaction, a distillation operation was carried out to distill unreacted isononanol and water.

3. catalytic hydrogenation

esterification products need to be subjected to catalytic hydrogenation to improve their stability and color. The esterification product and hydrogen are added into the hydrogenation reactor in a certain proportion, and the catalyst is added and heated to a certain temperature for hydrogenation reaction. The hydrogen pressure and reaction temperature need to be controlled during the reaction to ensure the smooth progress of the reaction. After completion of the reaction, a filtration operation was performed to remove the catalyst.

4. distillation purification

catalytic hydrogenation products need to be distillation purification, in order to obtain high purity DINP. The product is added to a distillation kettle, heated to a certain temperature, and distilled. The distillation temperature and pressure are controlled to collect the product of the specified fraction, which is the finished product DINP.

The above is the basic manufacturing method of DINP, which needs to be adjusted and controlled according to the actual situation during the specific operation. At the same time, in order to ensure product quality and production safety, it is necessary to strictly abide by relevant production regulations and operating procedures.

In summary, the production of DINP requires multiple steps, including raw material preparation, esterification, catalytic hydrogenation, and distillation purification. Each step requires strict control of operating conditions and product quality to ensure the quality and stability of the final product.

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