Method for catalytic synthesis of tributyl citrate by utilizing immobilized p-toluenesulfonic acid

Abstract

The invention provides a method for catalytic synthesis of tributyl citrate by utilizing immobilized p-toluenesulfonic acid, comprising the steps of taking the immobilized p-toluenesulfonic acid as a catalyst, carrying out esterification reaction on citric acid and n-butyl alcohol and synthetizing the tributyl citrate. The method provided by the invention has the advantages that: the immobilized p-toluenesulfonic acid adopted as the catalyst has no obvious corrosivity and is easy to recover and repeatedly utilize, the activity of the recovered catalyst basically remains unchanged; the esterification reaction efficiency is increased and the product yield can be up to 97.2-99.6%; adopting the reactant n-butyl alcohol as a water-carrying agent not only avoids the use of toxic solvents such as toluene and the like but also simplifies the aftertreatment process; the esterification reaction is mild in condition and simple in process, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for catalytically synthesizing tributyl citrate with immobilized p-toluenesulfonic acid. Background technique [0002] Tributyl citrate is a new type of non-toxic plasticizer, which has the characteristics of good compatibility, high plasticizing efficiency, non-toxicity, low volatility, cold resistance, mildew resistance, light resistance and water resistance. At present, the plasticizers commonly used in industry are phthalates. Because they can induce cancer, their use has been strictly controlled abroad. my country has also formulated relevant laws and regulations, and will gradually phase out their use in food packaging materials, medical appliances, and toys. However, tributyl citrate is used as a new substitute, so it has excellent development and application prospects. [0003] Tributyl citrate is usually formed by the esterification of citric acid and n-butanol ...

AI Technical Summary

Problems solved by technology

The traditional production process uses concentrated sulfuric acid as a catalyst, but this catalyst has many side reactions, difficult refining, serious equipment corrosion, complicated post-treatment process, and waste acid pollution. Its application has been greatly restricted.

Some catalysts that have been studied more later, such as solid superacids, have good catalytic activity for this reaction, but their preparation process is complicated and costly, which is not conducive to industrial production.

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