稀土改性固体超强酸SO_4^(2-)/TiO_2-La_2O_3催化合成丙酸系列酯  

Synthesis of Propionates by Using SO_4^(2-)/TiO_2-La_2 O_3 as Catalyst

作　　者：吕宝兰[1] 童文龙[1] 白爱民[1] 杨水金[1] 

机构地区：[1]湖北师范学院,化学与环境工程系,湖北黄石435002

出　　处：《香料香精化妆品》2004年第4期16-18,15,共4页Flavour Fragrance Cosmetics

基　　金：湖北省教育厅教研基金 ( 2 0 0 3 2 63 );湖北师范学院无机化学重点学科基金资助项目

摘　　要：报道了以稀土改性固体超强酸SO42 /TiO2 La2 O3 为多相催化剂 ,通过乙醇、正丙醇、正丁醇、异丁醇、正戊醇、异戊醇分别和丙酸反应合成了丙酸系列酯 ,探讨了该催化剂SO42 /TiO2 La2 O3 对酯化反应的催化活性 ,较系统地研究了醇酸摩尔比 ,催化剂用量 ,反应时间诸因素对产率的影响。实验表明 :合成丙酸系列酯的优化条件为n(醇 ) /n(丙酸 ) =1 .2 / 1 ,催化剂用量为反应物料总量的 2 .5 % ,反应时间为 1 .5h。上述优化条件下 ,丙酸乙酯的产率为 2 0 .9% ,丙酸丙酯的产率为 64.9% ,丙酸丁酯的产率为 83 .6% ,丙酸异丁酯的产率为 69.7% ,丙酸戊酯的产率为 87.5 % ,丙酸异戊酯的产率为 83 .3 %。SO 4 2- /TiO 2 -La 2 O 3 were used as catalyst for the esterification of propionic acid with ethanol, propanol, n-butanol, iso-butanol, n-amyl alcohol and iso-amyl alcohol. Effects of catalyst dosage, reaction time, molar ratio of reactants and amount of an agent which taking off water on synthesizing propionates were investigated. A suitable condition for synthesizing propionates was obtained, that is, molar ratio of alcohol to propionic acid is 1.2:1, the mass ratio of catalyst used to the reactants 2.5 %, the reaction time 1.5 h. Under this condition, yield of ethyl propionate is 20.9%, n-propyl propionate is 64.9%, n-butyl propionate is 83.6%, iso-butyl propionate is 69.7%, n-amyl propionate is 87.5% and iso-amyl propionate is 83.3%.

关 键 词：稀土改性固体超强酸SO4^2-/TiO2-La2O3 催化剂 乙醇 正丙醇 正丁醇 异丁醇 正戊醇 异戊醇 合成 丙酸酯 

分 类 号：TQ655[化学工程—精细化工]