乙二醇苯基醚丙烯酸酯的连续合成工艺研究

Continuous synthesis process for ethylene glycol phenyl ether acrylate

针对传统工业化合成乙二醇苯基醚丙烯酸酯(PHEA)存在效率低、能耗高和三废量大等问题,以丙烯酸与苯氧乙醇为原料,在固体酸催化作用下利用反应精馏技术进行连续酯化反应得到目标产物PHEA。在固定催化剂质量为34 g的条件下,考察反应温度、原料醇酸摩尔比、进料速度及空气流速对PHEA收率的影响。结果表明,在反应温度为110℃、原料醇酸摩尔比为1.0∶3.0、进料速度为120 g/h、空气流速为500 mL/min时,PHEA收率可达87.55%。对固体酸催化剂进行稳定性考察,该固体酸表现出良好的稳定性。

Traditional industrial synthesis process for ethylene glycol phenyl ether acrylate(PHEA)has the problems such as low efficiency,high energy consumption and many wastes.Therefore,a continuous synthesis process is developed.With acrylic acid and phenoxyethanol as raw materials,the target product PHEA is obtained through continuous esterification by using reactive distillation technology under the catalysis of solid acid.As catalyst dosage is fixed at 34 g,the effects of synthesis process parameters,such as reaction temperature,molar ratio of raw alcohol to acid,feed rate and air flow rate,on the yield of PHEA are investigated.The better synthesis process conditions are obtained as follows:reaction temperature is 110℃,the molar ratio of raw alcohol to acid is 1.0∶3.0,the feed rate is 120 g·h^(-1)and the air flow rate is 500 mL·min^(-1).Under these conditions,the yield of PHEA reaches 87.55%.It is found from investigation that the solid acid catalyst shows good stability.