SO_4^(2-)/ZrO_2-TiO_2催化合成乳酸乙酯的研究

Study on synthesis of ethyl lactate utilizing SO_4^(2-)/ZrO_2-TiO_2 as catalyst

以乳酸和乙醇为原料 ,在固体超强酸SO4 2 - /ZrO2 -TiO2 的催化下合成乳酸乙酯的工艺进行了的实验研究 ,最佳制备条件为 :氧化物配比为ZrO2 ∶TiO2 =1∶1 (摩尔比 ) ,浸泡硫酸浓度为 1 .5mol·L- 1 ,浸泡时间为 2 4h ,焙烧温度为 60 0℃ ,焙烧时间为 1h ;最佳酯化反应条件为 :醇酸比为 1 .5∶1 (摩尔比 ) ,催化剂的用量为乳酸质量的 2 .0 % ,反应时间为 1 1h ,乳酸乙酯产率可达 46 .76 %。

The ethyl lactate was synthesized starting from lactic acid and ethanol over a solid superacid SO 4 2- /ZrO 2-TiO 2 catalyst. SO 4 2- /ZrO 2-TiO 2 was synthesized by adding ZrO 2∶ TiO 2=1∶1 (molar ratio) to 1.5?mol·L -1 H 2SO 4 , immersing 24 hours, baking 1 hour at 600?℃. The molar ratio of ethanol to lactic acid was 1.5∶1 , reaction time was 11 hours , weight of catalyst was 2.0% of lactic acid mass. The yield of ethyl lactate reached up to 46.76%.