改性铝碳酸镁催化制备亚茴香基丙酮的研究

Synthesis of anisylidene acetone catalysted by modified hydrotalcite

采用共沉淀法制备改性铝碳酸镁,通过BET、XRD、FT-IR和SEM对催化剂进行表征。研究了n(Na OH)∶n(Na_2CO_3)及超声波处理等对改性铝碳酸镁催化活性的影响。结果表明,n(Mg)∶n(Al)=3∶1,n(Na OH)∶n(Na_2CO_3)=1∶1,超声波辅助共沉淀,焙烧制得的改性铝碳酸镁对大茴香醛与丙酮的缩合反应具有较好的催化活性与选择性;对改性铝碳酸镁催化下大茴香醛与丙酮经缩合反应合成亚茴香基丙酮的工艺进行研究,得到最佳的工艺条件为:催化剂质量分数为6%,反应温度为60℃,反应时间为10 h,n(丙酮)∶n(大茴香醛)=9∶1,在此条件下,大茴香醛转化率为99.69%,亚茴香基丙酮收率为97.50%。

Modified hydrotalcite is prepared by coprecipitation and characterized by BET,XRD,FT-IR and SEM.The effects of n（ Na OH） ∶ n（ Na_2CO_3） and ultrasonic treatment on the catalytic activity of modified hydrotalcite are studied. The results indicate that the modified hydrotalcite shows excellent catalytic activity and selectivity on the condensation reaction of aldehyde and acetone under the following conditions： 3∶ 1 of n（ Mg） ∶ n（ Al）,1∶ 1 of n（ Na OH） ∶n（ Na_2CO_3）,ultrasonic assisted coprecipitation and roasting. The condensation reaction of aldehyde and acetone catalyzed by modified hydrotalcite is also studied. The optimal conditions are： 6% of catalyst dosage,60℃ of reaction temperature,10 hours of reaction time and 9∶ 1 of n（ acetone） ∶ n（ anisic aldehyde）. Unde the optimal condition,the conversion rate of anisic aldehyde is 99. 69% and the yield is 97. 50%.