乳酸丁酯的非均相催化合成

在Ga2 O3负载量为20％,500℃焙烧2h的条件下制备了固体酸催化剂Ga2 O3/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...

Synthesis of butyl lactate via heterogeneous catalysis

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.