固体超强酸S_2O_8^(2-)/TiO_2-ZrO_2催化合成对羟基苯甲酸正丁酯  

Synthesis of Butyl p-hydroxybenzoate Catalyzed by Solid Superacid S_2O_8^(2-)/TiO_2-ZrO_2

作　　者：汪显阳[1] 

机构地区：[1]安徽医科大学化学教研室,硕士副教授合肥230032

出　　处：《精细石油化工进展》2004年第5期42-45,共4页Advances in Fine Petrochemicals

基　　金：安徽省教育厅资助课题(No.2003kj222)

摘　　要：以固体超强酸S_2O_8^(2-)/TiO_2-ZrO_2为催化剂合成了对羟基苯甲酸正丁酯,考察了催化剂制备条件对催化活性的影响,以及酸醇摩尔比、反应时间、催化剂用量诸因素对酯化率的影响。实验表明,S_2O_8(2-)-/TiO_2-ZrO_2具有良好的催化活性和选择性,用0.75 mol/L(NH_4)_2S_2O_8的溶液浸渍TiO_2-ZrO_2,过滤后于550℃下焙烧3 h,得到的催化剂活性最高;当酸醇摩尔比为1:3,反应时间为4h,催化剂用量占反应物总量的1.5％时,酯化率可达94.5％以上。Butyl p-hydroxybenzoate was synthesized using solid superacid S_2O_8~2-/TiO_2-ZrO_2 as catalyst. The effects of preaparation condition of S_2O_8~2-/TiO_2 _ ZrO_2 on catalytic activity and the effects of acid/alcohol molar ratio, amount of S_2O_8^(2-)/TiO_2-ZrO_2 and reaction time on the esterification conversion were studied. Experimental re- suits showed that the catalyst had high catalytic activity and selectivity for the esterification reaction and the catalytic activity of S_2O_8~2-/TiO_2-ZrO_2 immersed in 0.75 mol/L (NH_4)_2S_2O_8 solution and calcinated at 550℃ for 3 h was highest. It was found that the esterification yield of butyl p-hydroxybenzoate could reach up to 94.5% under acid/alcohol molar ratio 1:3, reaction time 4h and amount of S_2O_8^(2-)/TiO_2-ZrO_2 1.5%.

关 键 词：固体超强酸 S2O8^2-/TiO2-ZrO2 催化合成技术 对羟基苯甲酸正丁酯 催化剂 酯化反应 

分 类 号：O643.3[理学—物理化学]