SO_4^(2-)/TiO_2-La_2O_3催化合成丁醛乙二醇缩醛

Catalytic synthesis of n-butyraldehyde glycol acetal with SO_4^(2-)/TiO_2-La_2O_3

以稀土改性固体超强酸SO2-4/TiO2-La2O3为多相催化剂,丁醛和乙二醇为原料合成丁醛乙二醇缩醛,探讨了SO2-4/TiO2-La2O3催化剂对缩醛反应的催化活性,较系统地研究了原料量比、催化剂用量、反应时间诸因素对产品收率的影响。实验表明:在n(丁醛)∶n(乙二醇)为1∶1 5、催化剂用量为反应物料总质量的0 50%、环己烷为带水剂、反应时间1 0h的优化条件下,丁醛乙二醇缩醛的收率可达95 3%。

n-Butyraldehyde glycol acetal was synthesized from n-butyraldehyde(Ⅱ)and glycol as raw materials in the presence of SO^(2-)_4/TiO_2-La_2O_3 as catalyst.Factors influencing the product yield were discussed and optium reaction conditions were found.Experimental results showed that SO^(2-)_4/TiO_2-La_2O_3 is an excellent catalyst.With molar ratio of n-butyraldehyde to glycol =1.0∶1.5,catalyst dosage=0.50 %(mass ratio of catalyst to total reactants),using cyclohexane as water carrier and reaction time 1.0 h,the yield of the product achieves 95.3 %.