DOP Manufacturing Process | JCT Machinery

1. Raw Material Preparation

Phthalic Anhydride (PA): one of the main raw materials.

2-Ethylhexanol (2-EH): another main raw material.

Catalyst: usually an acidic catalyst such as sulfuric acid or p-toluenesulfonic acid is used.

2. Esterification Rection

Reactor: use a reactor for esterification reaction.

Reaction Conditions: usually the temperature is 180-220℃, the pressure is  normal pressure or slightly negative pressure.

Reaction Process: phthalic anhydride and octanol react with esterification under the action of catalyst to generate DOP and water.

3. Water Separation

Separation Equipment: usually a water separator or water separator is used.

Process: the water produced by the reaction and part of the unreacted octanol are separated by a water separator. The separated water needs to be discharged in time, and the unreacted octanol can be recycled.

4. Refining

Vacuum Distillation: The crude product is separated by a vacuum distillation tower to remove low-boiling substances (such as unreacted raw materials and by-products) and high-boiling substances (such as excess phthalic anhydride).

Decolorization: Sometimes it is necessary to use activated carbon or other decolorizers to decolorize the product to remove color and impurities.

5. Cooling and Storage

Cooling: The refined DOP product is cooled to room temperature by a cooler.

Storage: The cooled DOP product is stored in a sealed storage tank for subsequent packaging and transportation.

6. Packaging and Transportation

Packaging: The finished DOP is packed into standard containers, such as steel drums or plastic drums, ensuring good sealing to prevent leakage.

Transportation: The product is delivered to customers or markets by tank trucks, containers or other suitable transportation methods.