固体酸La_2O_3-Ga_2O_3/硅胶的研制及其催化合成丙酸异丁酯  

Preparation of Solid Acid La_2O_3-Ga_2O_3/Silica Gel for Catalytic Synthesis of Isobutyl Propionate

作　　者：杨一可[1] 李空军 何建英[1] 陈丹云[1] 

机构地区：[1]河南大学化学化工学院精细化学与工程研究所,河南开封475004 [2]商丘技师学院,河南商丘476000

出　　处：《稀土》2012年第5期91-93,共3页Chinese Rare Earths

基　　金：河南省科技厅2009年科技发展计划项目(092102210171)

摘　　要：采用自制固体酸La2O3-Ga2O3/硅胶为催化剂催化丙酸与异丁醇进行酯化反应合成了丙酸异丁酯,并采用IR分析对催化剂进行了表征。催化剂的制备条件为La2O3∶Ga2O3∶硅胶=5∶20∶75(质量比),500℃焙烧2 h。考察了催化剂用量、醇酸物质的量比、反应时间、带水剂种类和催化剂的重复使用性等因素对酯化率的影响。结果表明,适宜的反应条件为0.20 mol丙酸,催化剂用量1.00 g、醇酸物质的量比1.8,反应时间90 min,酯化率可达98.2%。Isobutyl propionate was synthesized from propionic acid and isobutyl alcohol with La2O3-Ga2O3/silica gel as catalysts.It was characterized by IR techniques.Various reaction effects such as catalyst dosage,molar ratio of isobutyl alcohol to propionic acid,reaction time,the kinds of deaquation reagent and reusability of the catalyst on esterification rate were investigated.The results showed that conditions prepared of the catalyst were：La2O3Ga2O3silica gel=52075（mass ratio）,calcinating at 500 ℃ for 2.0 h.The optimized conditions of synthesizing isobutyl propionate were：propionic acid 0.20 mol,mole ratio of alcohol to acid 1.8,catalyst dosage 1.00g,reaction time 90min,esterification rate could reach 98.2%.

关 键 词：La2O3-Ga2O3/硅胶 丙酸异丁酯 酯化 

分 类 号：O643.32[理学—物理化学]