【摘要】 研究了以纳米稀土复合固体超强酸SO42-/ZrO2-Nd2O3为催化剂,以乳酸和正丁醇为原料合成乳酸正丁酯。通过正交实验考察了影响酯化反应的主要因素,确定的最佳合成条件为:乳酸用量为0.1mol时,正丁醇与乳酸物质的量之比为3.0∶1,催化剂用量为0.55g,带水剂环己烷15mL,回流反应2.0h,酯化率可达98.7%。该催化剂回收简单,重复使用7次后,酯化率仍在96%以上。更多还原

【Abstract】 N-butyl lactate was synthesized from lactic acid and n-butyl alcohol with rare earth solid superacid SO42-/ZrO2-Nd2O3 as catalyst,The effect of primary factors on esterification was investigated by orthogonal design experiment,The results showed that the optimum reaction conditions were:based on 0.1 mol lactic acid,molar ratio of n-butyl alcohol to lactic acid was 3.0∶1,the amount of catalyst was 0.55 g,15mL cyclohexane as water carrying agent,reaction time was 2.0 h at reflux temperature,the esterification yield was up to 98.7% under the optimum condition,rare composite solid superacid SO42-/ZrO2-Nd2O3 catalyst can be reused by simple phase-separation,the esterification yield was still up to 96% after the catalyst was reused 7 times.更多还原