离子液体-铝盐催化蔗糖制乙酰丙酸甲酯

Investigation on aluminum salt/1,3-dialkyl imidazolium salt catalyzed conversion of sucrose to methyl levulinate

研究发现铝盐及铝盐与咪唑的复合盐催化剂可以在甲醇中催化蔗糖反应生成乙酰丙酸甲酯,尤其是在铝盐中加入1,3-二甲基咪唑的硫酸氢盐时,可以明显地提高乙酰丙酸甲酯的收率。本研究工作考察了B酸型的离子液体1,3-二甲基咪唑硫酸氢盐与各种铝盐的协同催化作用,同时研究了反应时间、反应温度和催化剂用量对乙酰丙酸甲酯收率的影响,优化了反应条件。在反应温度为140℃下反应3 h,使用0.500 g的1,3-二甲基咪唑硫酸氢盐和0.500 g的甲基磺酸铝作催化剂,乙酰丙酸甲酯的摩尔收率达到70%。

Investigation shows that aluminum salts and their combinations with 1,3-dialkylimmidazolium salts are efficient catalysts for the conversion of sucrose to methyl levulinate in methanol.Especially,the combinations of aluminum salts with 1,3-dimethylimidazolium hydrogen sulfate have high activity for the methyl levulinate synthesis from sucrose and high methyl levulinate yield was obtained.The investigation examined the co-catalysis of aluminum salts and 1,3-dimethylimidazolium hydrogen sulfate.The effects of reaction time,reaction temperature,and catalyst loading on methyl levulinate yield were studied.The reaction conditions were optimized.It was found that good yield（70% in mol） of methyl levulinate could be obtained at 140℃ by reaction 3 h with 1,3-dimethylimidazolium hydrogen sulfate and Al（CH3SO3）3 loading of 0.500 g and 0.500 g,respectively.