【摘要】 在氧化镓固载量为20%,500℃焙烧2 h的条件下制备了硅胶固载氧化物型非均相酯化催化剂Ga2O3/S iO2,用于催化合成乙酸丁酯,考察了催化剂用量、n(正丁醇)∶n(乙酸)、环己烷用量、反应时间、带水剂用量和催化剂重复使用性等因素对酯化率的影响。结果表明,该催化剂催化合成乙酸丁酯的适宜反应条件为:乙酸0.2 mol,n(正丁醇)∶n(乙酸)=1.8,催化剂1.25 g,回流反应1 h,酯化率达99.62%。更多还原

【Abstract】 A novel heterogeneous esterification catalyst,gallium oxide supported on silica gel was prepared for the first time,which was obtained through loading concentration of Ga2O3 20%,calcinating at 500 ℃ for 2 h.The effects of various parameters such as catalyst dosage,molar ratio of n-butanol to acetic acid,amount of cyclohexane,reaction time and reusability of catalyst on esterification rate were investigated.The results indicated that the optimized conditions of synthesizing butyl acetate were:acetic acid 0.2 mol,molar ratio of n-butanol to acetic acid 1.8,dosage of catalyst 1.25 g,reaction time 1 h.The catalytic performance could exhibit high activity with the esterification rate over 99.62%.更多还原