固体超强酸SO_4^(2-)/TiO_2在α-蒎烯合成紫苏葶中的应用研究  

Study on Application of Solid Superacid SO_4^(2-)/TiO_2 in Preparing Perillartine from α-Pinene

作　　者：王亚明[1] 蒋丽红[1] 钟莉[1] 

机构地区：[1]昆明理工大学化学工程学院,云南昆明650224

出　　处：《林产化学与工业》2009年第2期17-21,共5页Chemistry and Industry of Forest Products

摘　　要：筛选出了用α-蒎烯三步法合成制紫苏葶的一种新型催化剂SO42-/TiO2型固体超强酸,得到催化剂制备的最适工艺条件为:硫酸浓度0.5mol/L、催化剂焙烧温度300℃、焙烧时间3h。用上述条件制备的催化剂催化桃金娘烯醛异构化制紫苏醛,得到最适工艺条件为:反应温度400℃、反应压力28kPa、空气流速12h-1。桃金娘烯醛的最高转化率达87.45%,紫苏醛的收率达41.29%,三步反应总转化率为33.49%。用IR、程序升温脱附(TPD)和BET比表面积对催化剂进行了表征,并将催化剂特性与它们的催化性能相关联。实验结果表明:SO42-/TiO2固体超强酸催化剂表面形成螯合配位;该催化剂的活性随其比表面积和总酸量的增加而增大。A new catalyst, namely SO4^2-/TiO2 solid superaeid, used in the synthesis of perillartine from α-pinene by three-step process, has been screened, and the preparation conditions of the catalyst were ： concentration of sulphurie-acid 0.5 mol/L, calcination temperature of the catalyst 300℃, calcination time 3 h. The catalyst has been used to catalyze isomerization of myrtenal to produce perillaldehyde, and the optimal process parameters were as below： reaction temperature 400℃, reaction pressure 28 kPa, air speed 12 h^-1. the maximum conversion of myrtenal was 87.45 %, the yield of perillaldehyde was 41.29 %, the three-step reaction overall conversion was 33.49 %. Physical properties of the catalyst were investigated with IR, TPD and BET in terms of their catalytic capability. The experimental results showed that chelated surface of SO4^2-/TiO2 solid superacid was formed, and the catalytic activity was increased with increase of specific surface area and total acid content.

关 键 词：SO42-/TiO2固体超强酸 Α-蒎烯 桃金娘烯醛 紫苏醛 紫苏葶 

分 类 号：TQ351.472[化学工程]