乳酸丁酯的非均相催化合成  

Synthesis of butyl lactate via heterogeneous catalysis

作　　者：蔡永红[1] 史利勇[1] 邹雪艳[2] 何建英[1] 陈丹云[1] 

机构地区：[1]河南大学化学化工学院,河南开封475004 [2]河南大学基础实验教学中心,河南开封475004

出　　处：《化学研究》2011年第6期42-45,共4页Chemical Research

基　　金：河南省科技厅2011年科技发展计划项目(112102210008)

摘　　要：在Ga2O3负载量为20%,500℃焙烧2h的条件下制备了固体酸催化剂Ga2O3/SiO2,利用红外光谱分析对催化剂进行了表征.将其用于非均相催化合成乳酸丁酯的反应,考察了催化剂用量、n(正丁醇)∶n(乳酸)、环己烷用量、反应时间和催化剂重复使用性能等因素对酯化率的影响.结果表明,该催化剂催化合成乳酸丁酯的适宜反应条件为:乳酸0.2mol,n(正丁醇)∶n(乳酸)=1.4、催化剂0.75g、回流反应时间50min;相应的酯化率达97.37%.与其他合成乳酸丁酯的催化剂相比较,该催化剂制备方法简单,催化活性好,反应时间短,酯化率高,且具有一定的重复使用价值.Ga2O3/SiO2,a novel solid acid esterification catalyst,was synthesized by calcinating at 500 ℃ for 2 h at a Ga2O3 loading concentration of 20%.As-synthesized product was characterized by means of infrared spectrometry.Moreover,as-synthesized product was used as a catalyst to synthesize butyl lactate via heterogeneous catalytic route.The effects of various parameters such as catalyst dosage,molar ratio of n-butanol to lactic acid,dosage of cyclohe-xane,reaction time and reusability of the catalyst on esterification rate were investigated.Results indicate that butyl lactate can be readily synthesized by 50 min of reflux reaction of 0.2 mol lactic acid at an n-butanol to lactic acid molar ratio of 1.4 and a catalyst dosage of 0.75 g.Corresponding esterification rate is as high as 97.37%.When compared with other catalysts for synthesizing butyl lactate,as-synthesized catalyst possesses advantages such as simple preparation procedure,good catalytic activity,short reaction time,high esterification rate,and some reusability.

关 键 词：Ga2O3/SiO2 固体酸催化剂 乳酸丁酯 非均相催化 合成 

分 类 号：TQ225.24[化学工程—有机化工]