固体超强酸催化合成丁醛1,2-丙二醇缩醛

Synthesis of Butyraldehyde 1,2-Propanediol Acetal Using Solid Superacid as Catalyst

以固体超强酸SO42-/TiO2-MoO3为催化剂,对以丁醛和1,2-丙二醇为原料合成丁醛1,2-丙二醇缩醛的反应条件进行了研究。实验表明:在固体超强酸SO42-/TiO2中添加MoO3有利于产物的合成,具有更好的催化活性。较系统地研究了醛醇摩尔比、催化剂用量、反应时间等因素对得率的影响。最佳反应条件为:丁醛与1,2-丙二醇摩尔比(n丁醛∶n1,2-丙二醇)为1∶1.5,催化剂用量为反应物料总质量的0.5%,环己烷为带水剂,反应时间45 m in。上述条件下,SO42-/TiO2-MoO3是合成丁醛1,2-丙二醇缩醛的良好催化剂,其得率可达87.5%.

Butyraldehyde 1,2-propanediol acetal was synthesized from butyraldehyde and 1,2-propanediol catalyzed by solid superacid SO4^2-/TiO2-MoO3. The experimental results showed that catalytic activity of the catalyst was improved through addition of MoO3 into SO4^2-/TiO2. Influencing factors of the synthesis were discussed and the optimums reaction condition was found to be： molar ratio of butyraldehyde to 1,2-propanediol 1 ： 1.5, dosage of catalyst O. 5 % of feed stocks, and reaction time 45 min. SO4^2-/TiO2-MoO3 is an excellent catalyst for synthesizing butyraldehyde 1,2-propanediol acetal to improve the yield up to 87.5%. Key words： butyraldehyde 1,2-propanediol acetal ; solid superacid ; acetalization