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[Chemical Knowledge]：Production method and process of dibutyl phthalate

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Dibutyl phthalate (DBP) is a common plasticizer, which is widely used in the production of plastics, rubber, paints, coatings and other chemicals. The following is a method for producing dibutyl phthalate:

1. Raw Material Preparation

The main raw materials for producing dibutyl phthalate include phthalic acid, n-butanol and a catalyst. Among them, phthalic acid can be extracted from petroleum or coal, and n-butanol can be prepared by biological fermentation or petrochemical raw materials.

2. Esterification Reaction

phthalic acid and n-butanol are added into the reactor according to a certain molar ratio, a catalyst is added, the temperature is raised to a certain temperature, and the esterification reaction is started. The temperature and pH value need to be controlled during the reaction to ensure the smooth progress of the reaction. After completion of the esterification reaction, a distillation operation was performed to distill unreacted n-butanol and water to obtain crude dibutyl phthalate.

3. refining operation

crude dibutyl phthalate contains some impurities, such as acid, alcohol, water, etc., and needs to be refined. It is usually refined by washing, dehydration, distillation and other methods to obtain dibutyl phthalate with high purity.

4. Product Packaging and Storage

Put the refined dibutyl phthalate into a clean container and seal it for preservation. It should be noted that dibutyl phthalate has certain toxicity and should be stored in a dry, cool, well-ventilated place to avoid exposure to open flames and high temperatures.

The above is the basic manufacturing method of dibutyl phthalate, which needs to be adjusted and optimized according to the actual situation in the specific production process. At the same time, in order to ensure product quality and production safety, it is necessary to strictly abide by relevant regulations and standards, and strengthen production management and quality control.

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