Dibutyl phthalate (DBP) is a common plasticizer, widely used in the production of plastics, rubber, paints, coatings and other chemicals. The following is the manufacturing method of Dibutyl Phthalate:
I. Preparation of raw materials
The main raw materials for manufacturing Dibutyl Phthalate include phthalic acid, n-butanol and catalyst. Among them, phthalic acid can be extracted from petroleum or coal, and n-butanol can be prepared by biofermentation or petrochemical feedstock.
II. Esterification reaction
Phthalic acid and n-butanol are added to the reaction kettle according to a certain molar ratio, a catalyst is added, and the temperature is raised to a certain temperature to start the esterification reaction. Temperature and pH need to be controlled during the reaction to ensure the smooth progress of the reaction. After the end of the esterification reaction, distillation operation is carried out to evaporate the unreacted n-butanol and water to obtain crude dibutyl phthalate.
Three, refining operation
Crude dibutyl phthalate contains some impurities, such as acid, alcohol, water and so on, which need to be refined operation. Usually washing, dehydration, distillation and other methods are used for refining to get the product of Dibutyl phthalate with higher purity.
Four, product packaging and storage
The refined Dibutyl phthalate is packed into clean containers and sealed for storage. It should be noted that Dibutyl phthalate has certain toxicity, it should be stored in a dry, cool and well-ventilated place, avoiding contact with open flame and high temperature.
Above is the basic manufacturing method of dibutyl phthalate, the specific production process needs to be adjusted and optimized according to the actual situation. At the same time, in order to ensure product quality and production safety, it is necessary to strictly comply with relevant regulations and standards, and strengthen production management and quality control.
