微波辐射纳米Y_2O_3催化合成乙酸龙葵酯

Catalytic Synthesis of Hydratropyl Acetate with Nanometer Y_2O_3 under Microwave Radiation

以乙酸和龙葵醇为原料,以纳米Y2O3为催化剂,利用微波技术合成了乙酸龙葵酯。探讨了微波辐射功率、辐射时间、醇酸摩尔比及催化剂用量等对酯化反应的影响。实验结果表明,较佳的反应条件为:在龙葵醇用量为0.1 mol时,n(龙葵醇)∶n(乙酸)=1∶1.8,纳米Y2O3催化剂用量为反应物总质量的1.1%,带水剂环己烷10 mL,微波功率为350 W,辐射时间为10 min,乙酸龙葵酯收率可达96.5%。催化剂重复使用6次仍保持较高活性。

Hydratropyl acetate was synthesized with acetic acid and hydratropyl alcohol catalyzed by nanometer Y2O3 and accelerated with microwave irradiation. The effects of microwave irradiation power, reaction time, molar ratio of hydratropyl alcohol to acetic acid and the amounts of catalyst on esterification were discussed. The experimentation results showed that the optimum preparation conditions were： molar ratio of hydratropyl alcohol to acetic acid was 1 ： 1.8 （when hydratropyl alcohol was 0. 1mol）, the quantity of catalyst was 1.1% of the total feed stock, the amount of cyclohexane as the water taking reagent was 10mL, the microwave power was 350W, radiation time was 10min, the yield of hydratropyl acetate could reach 96.5 %. The catalyst could be repeatedly used six times without lossing its catalytic.