新型固体磺酸催化合成苹果酯的研究

以活性炭磺化制得新型固体磺酸磺化炭为催化剂,对乙酰乙酸乙酯和乙二醇合成苹果酯的催化工艺进行了系统研究。讨论了酯醇比、催化剂用量、反应时间、带水剂用量对酯化率的影响。最佳反应条件为:n(乙酰乙酸乙酯):n(乙二醇)=1:1.8,催化剂用量为乙酰乙酸乙酯质量的2%,带水剂用量为20mL,反应时间3h。在优化条件下反应,苹果酯收率达到93.1%,选择性接近100%。实验表明,磺化炭是合成苹果酯的优良催化剂,与其他酸催化剂相比,它还具有活性高、用量少、无污染等突出的优点。

Studies on Catalytic Synthesis of Fructone by a New Solid Sulfonic Acid Sulfonated Activated Carbon

The synthesis of fructone from ethyl acetoacetate and ethylene glycol using sulfonated activated carbon as solid acid catalyst was investigated.Various reaction parameters such as ratio of ethyl acetoacetate to ethylene glycol,catalyst amount,reaction time and water-carrying reagent amount were studied.The optimum reaction conditions were: the molar ratio of ethyl acetoacetate to ethylene glycol was 1:1.8,the quantity of catalyst was equal to 2% ethyl acetaoacetate,amount of cyclohexane was 20mL,and the reaction time was 3h.The yield of fructone reached 93.1% and its selectivity was nearly 100% under the optimum condition.The experimental results showed that sulfonated activated carbon was an excellent catalyst for synthesis of fructone.Comparaed with other acid catalysts,the sulfonated activated carbon has higher activity,lesser usage and no pollution.