Tributyl citrate is a new type of non-toxic plastic plasticizer. It has attracted much attention because of its good compatibility, high plasticizing efficiency, non-toxicity, low volatility and strong weather resistance. It has become the green substitute for phthalate. Environmentally friendly products. With the enhancement of people's environmental awareness and the improvement of environmental regulations, the development and production of Tributyl citrate has excellent development prospects.
Tributyl citrate is usually esterified by citric acid and n-butanol under the action of a catalyst. The traditional catalyst is concentrated sulfuric acid. Although it has low price and high catalytic activity, it has serious equipment corrosion, complicated post-treatment process and poor reaction selection. The environmental pollution is serious and so on. Therefore, the research on catalysts that can replace concentrated sulfuric acid is quite active. Many catalysts with good catalytic effects have been discovered:
[Sodium bisulphate catalyzed synthesis of Tributyl citrate]
Sodium bisulfate monohydrate is a strong ionic compound. It has been found to be easily soluble in water. The aqueous solution is strongly acidic, but insoluble in organic acid and alcohol reaction system. It can be used as a catalyst for esterification. It has the advantages of high activity, good stability, high yield, easy separation, simple synthesis method, no corrosion and no pollution.
[Solid Superacid Catalytic Synthesis of Tributyl Citrate]
Superacids are acids that are stronger than 100% sulfuric acid. Studies have shown that it can be used as a catalyst for esterification reaction with good selectivity, fast reaction rate, high yield, easy separation, convenient operation, stable catalyst, reusable, non-corrosive equipment and no pollution. It is a promising future. catalyst.
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