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以稀土改性固体超强酸SO_4~(2-)/TiO_2—La_2O_3为催化剂,通过苯甲醛和1,2—丙二醇反应合成了苯甲醛1,2—丙二醇缩醛,探讨了SO_4~(2-)/TiO_2—La_2O_3对缩醛反应的催化活性,研究了醛醇物质的量比、催化剂用量、反应时间等对产品收率的影响。实验表明,SO_4~(2-)/TiO_2—La_2O_3是合成苯甲醛1,2—丙二醇缩醛的良好催化剂,在n(醇):n(醛)=2.25:1,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50min的优化条件下,苯甲醛1,2—丙二醇缩醛的收率可达80.8％。
Benzaldehyde 1,2-propanediol was synthesized by the reaction of benzaldehyde and 1,2-propanediol with SO_4 ~ (2 -) / TiO_2-La_2O_3 as rare earth-modified solid superacid catalyst. The effects of SO_4 ~ (2-) / TiO_2-La_2O_3 on the acetal reaction was studied. The effects of the amount of aldol, the amount of catalyst and the reaction time on the yield of the product were investigated. The experimental results show that SO_4 ~ (2 -) / TiO_2-La_2O_3 is a good catalyst for the synthesis of benzaldehyde 1,2-propanediol acetal. When n (alcohol) = 2.25: 1, the amount of catalyst is the mass of the reaction mass 0.50%, cyclohexane as water-bearing agent, the reaction time 50min under the optimized conditions, the yield of benzaldehyde 1,2-propanediol acetal up to 80.8%.