纳米级固体超强酸SO_4^(2-)/ZrO_2催化合成乙酸芳樟酯的研究

STUDY ON ACETYLATION OF LINALOOL CATALYZED BY NANO-SOLID SUPERACID SO_4^(2-)/ZrO_2

首次采用纳米级固体超强酸SO42-/ZrO2为催化剂合成乙酸芳樟酯,考察了催化剂用量、反应温度、反应时间、乙酐与芳樟醇摩尔比(酐醇比)等因素对反应的影响。结果表明,反应温度30℃、反应时间6.5h、催化剂用量为原料质量的2.5%、酐醇比为2.5∶1时,芳樟醇转化率为93.2%,产物中乙酸芳樟酯含量为53.78%,总酯含量为76.89%。通过与其它催化剂对比发现,本实验反应时间较短,催化剂可重复使用,有较好的应用潜力。

The acetylation of linalool catalyzed by nano-solid superacid SO 2- _4/ ZrO_2 was studied for the first time. Through individual factors experiments, the influences of reaction temperature, reaction time, dosage of catalyst and ratio between acetic anhydride and linalool on reaction had been discussed. By orthogonal test, the optimum technological condition had been obtained: the optimum temperature and time were 30 ℃ and 6.5 h, respectively, catalyst dosage was 2.5 %,the ratio between acetic anhydride and linalool was 2.5∶1 (mol ratio). Under the optimum condition,the conversion rate of linalool was 93.24 %, the content of total ester was 76.89 %, linalyl acetate content was 53.78 % among products. Through comparison between the nano-solid superacid SO 2- _4/ ZrO_2 and other catalysts used to acetylizing linalool,the reaction time of the former was shorter, and the catalyst could be reused. This catalyst had good potential of application.