SO_4^(2-)/TiO_2-Al_2O_3复合固体超强酸催化合成柳酸异戊酯的研究  

Catalytic synthesis of isoamyl salicylate by the composite solid superacid SOr/TiO_2-Al_2O_3

作　　者：金华峰[1] 

机构地区：[1]安康师范专科学校化学系,安康725000

出　　处：《化学试剂》2003年第1期37-39,共3页Chemical Reagents

基　　金：陕西省教育厅自然科学应用基础资助项目(01JK203)。

摘　　要：采用共沉淀法制备了固体超强酸SO42-/TiO2-Al2O3,首次将其用于催化柳酸与异戊醇的酯化反应,研究了各种因素对产物收率的影响,确定了反应的最佳条件:催化剂焙烧温度为500℃,催化剂中n(Ti):n(Al)=2:1,n(醇):n(酸)=1.8:1,反应时间3h,反应温度120～140℃,催化剂用量1.0g,带水剂(甲苯)用量为10mL,该条件下,柳酸异戊酯收率高达98％,并推断出催化剂酸强度为:-16.02<Ho<-14.52。The composite solid superacid SO42- /TiO2-Al2O3 was used as catalyst for the preparation of isoamyl salicylate. This is the first report on the composite solid superacid catalytic synthesis of isoamyl salicylat'e from salicylic acid and isoamyl alcohol. The factors influencing the reaction were discussed, the results showed that the appropriate conditions should be:catalyst calcination temperature 400℃; molar ratio of Ti/Al 2:1; weight of catalyst 1.0g; molar ratio of isoamyl alcohol to salicylic acid 1. 8 : 1; reaction time 3.0h; reaction temperature 120~140℃ ;the water-taking reagent (toluene) 10mL. The yield of isoamyl salicylste was above 98. 0%. The acid strength of the catalyst was: - 16. 02 < H0 < -14.52.

关 键 词：SO4^2-/TiO2-Al2O3复合固体超强酸 催化剂 柳酸异戊酯 浓硫酸 二氧化钛 氧化铝 

分 类 号：O623.624[理学—有机化学] O643.36[理学—化学]