稀土固体超强酸SO_4^(2-)/TiO_2-CeO_2催化合成乳酸丙酯的研究  

Study on the Catalytic Synthesis of Propyl Lactate by the Rare Earth Solid Superacid SO_4^(2-)/TiO_2-CeO_2

作　　者：吴仁涛[1] 李震[1] 周丽霞[2] 楚杰[1] 

机构地区：[1]泰山学院化学系 [2]山东科技大学工程学院,山东省泰安市271021

出　　处：《曲阜师范大学学报（自然科学版）》2006年第2期93-97,共5页Journal of Qufu Normal University(Natural Science)

基　　金：泰山学院科研计划项目(P03-2-06)

摘　　要：为了探讨α-羟基酸酯化反应机理,制备了一种稀土固体超强酸催化剂SO42-/TiO2-CeO2,并对其催化合成乳酸丙酯的最适宜反应条件和催化反应动力学进行了研究.实验表明:Ce4+改性的钛系固体超强酸催化剂与单纯使用稀土硫酸盐或钛系固体超强酸相比,具有更高的催化活性;以苯为带水剂,在酸醇摩尔比为n(乳酸)∶n(正丙醇)=1∶2.0的条件下,催化剂用量为1.0 g.0.1 mol-1(乳酸),反应温度为120℃,反应时间120 min,酯化率达到了96.5%.For researching reaction mechanism of a-hydroxyl acids esterification, a rare earth solid superacid catalyst SO4^2-/TiO2-CeO2 has been prepared. The optimal reaction conditions and catalysis reaction dynamics catalyzed synthesis of propyl lactate is studied with the rare earth solid superacid as catalyst. Experiment shows that the catalytic activity of the titanic solid superacid catalyst modified by Ce^4＋ has higher than that of the rare sulfate or the titanic solid superacid. As carry water reagent with benzene, molar ratio of lactic acid to 1-propanol is 1 ： 2.0, the weight of catalyst is 1.0 g/0. 1 mol lactic acid, the reaction temperature is 120℃ and the reaction time is 120 min. The ratio of the esterification could reach over 96.5%.

关 键 词：稀土固体超强酸 乳酸丙酯 催化剂 反应动力学 

分 类 号：O623.6[理学—有机化学] TQ655[理学—化学]