Tributyl Citrate (TBC), a widely utilized non-toxic plasticizer, is synthesized through a chemical process that combines citric acid and n-butanol. Understanding the synthesis pathways and chemical properties of TBC is crucial for chemists and procurement managers seeking to leverage its benefits. As a supplier of high-quality chemical intermediates, we aim to provide comprehensive insights into compounds like TBC (CAS No. 77-94-1).

The primary method for synthesizing Tributyl Citrate involves the esterification of citric acid with n-butanol. This reaction typically requires a catalyst to facilitate the process and achieve a high yield of the desired product. Traditionally, concentrated sulfuric acid has been used as a catalyst due to its effectiveness and low cost. However, its corrosive nature and the complexity of the post-processing steps have driven research into alternative catalytic systems.

Recent advancements in catalytic technology have led to the development of more efficient and environmentally friendly catalysts for TBC synthesis. Solid acid catalysts, such as those based on sulfated metal oxides (e.g., SO42−/ZrO2–TiO2), have shown great promise. These catalysts offer advantages like high selectivity, reusability, reduced corrosion, and minimal environmental pollution. Other catalysts, including sodium bisulfate and p-toluenesulfonic acid, have also been explored for their efficacy and milder reaction conditions.

The resulting Tributyl Citrate is a colorless, oily liquid with a faint, pleasant fruity odor. It is practically insoluble in water but readily dissolves in most organic solvents, including methanol, acetone, and castor oil. Key physical and chemical properties include:

  • Appearance: Colorless transparent liquid.
  • Purity: Typically ≥99%.
  • Acidity: Low, usually ≤0.10 mg KOH/g.
  • Water Content: Low, typically ≤0.10%.
  • Flash Point: Around 185°C, indicating good thermal stability.
  • Volatility: Low, contributing to product longevity.
  • Compatibility: Excellent with resins like PVC and cellulose derivatives.

These properties collectively make TBC an effective plasticizer, enhancing the flexibility, cold resistance, and water resistance of polymers. Its low toxicity profile further solidifies its position as a preferred choice over phthalate plasticizers, especially in sensitive applications like food packaging, medical devices, and children's toys.

For manufacturers looking to buy Tributyl Citrate, understanding these synthesis routes and properties allows for better quality control and application development. We are committed to supplying TBC that meets stringent purity and performance standards, ensuring your formulations achieve the desired outcomes. Partner with us for your TBC supply needs and leverage the benefits of this advanced, eco-friendly plasticizer.