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Production Details Of DOP | JCT Machinery

DOP production line

Raw Materials of DOP
1. Main Raw Materials
• Phthalic anhydride (PA)
• 2-Ethylhexanol (2-EH)
• Catalyst (concentrated sulfuric acid or organic titanate)
• Stabilizer (such as antioxidant)
2. Reaction Aid (optional according to the process)
• Dehydrating agent (such as benzene, toluene): helps to remove water and improve esterification efficiency.
• Neutralizer (such as sodium carbonate, sodium hydroxide): used to neutralize residual acid and improve product.
Overview of DOP Production Process

  • 1. Esterification Reaction

  • In reactor, phthalic anhydride and 2-ethylhexanol are mixed, a catalyst is added, and the mixture is heated to 180-210℃ for esterification reaction to generate DOP and by-products (such as water).

  • 2. Dehydration and Condensation

  • The water is removed through the condensation system to promote the complete reaction.

  • 3. Neutralization and Washing

  • Alkaline substances are added to neutralize the residual acidic substances, followed by water washing to reduce the impurity content.

  • 4. Decolorization and Refining

  • Activated carbon or vacuum distillation is used to remove impurities to improve product transparency and stability.

  • 5. Finished Product Storage

  • Qualified DOP is filtered and stored in a storage tank for packaging or transportation.

DOP production line control system

Key Technical Advantages
1. High-purity Raw Materials: Ensure that DOP products have excellent plasticizing properties and low volatility.
2. Optimized Esterification Process: Use high-efficiency catalysts and automated control to improve conversion rate and product quality.
3. Environmentally Friendly Process: Reduce by-product emissions, reduce energy consumption, and improve production efficiency.


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