【摘要】 研究了以稀土复合固体超强酸SO₄^2--/ZrO₂-CeO₂作催化剂,乳酸和乙醇为原料合成食用香料乳酸乙酯。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0.1 mol时,乙醇与乳酸物质的量之比为3.0:1,催化剂用量为乳酸质量的2.5%,回流反应3.0 h,带水剂环已烷20 mL/0.1 mol乳酸条件下,酯化率可达90.3%。且该催化剂具有良好的重复性和再生性。更多还原

【Abstract】 The synthesis of flavor ethyl lactate with lactic acid and ethanol as reactants and rare earth composite solid superacid SO₄^2-/ZrO₂-CeO₂ as catalyst was studied.The effect of primary factors on esterifi- cation was investigated by orthogonal design experiment.The results showed that the optimum reaction con- ditions were:based on 0.1mol lactic acid,molar ratio of ethanol to lactic acid was 3.0:1,catalyst amount was 2.5% of lactic acid mass,water-carrying agent（cyclohexane）was 20mL/0.1mol lactic acid,reaction time was 3.0h at reflux temperature,the esterification yield was up to 90.3% under the optimum condition. And the catalyst was reused and regenerated.更多还原