酯交换合成乙二醇二乙酸酯反应精馏研究  

Study on the reactive distillation of ethylene glycol diacetate synthesis by transesterification

作　　者：李柏春[1] 贾彦霞 秦兴华 张文林[1] LI Bai-chun;JIA Yan-xia;QIN Xing-hua;ZHANG Wen-lin(School of Chemical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学化工学院

出　　处：《化学工程》2019年第5期12-17,共6页Chemical Engineering(China)

摘　　要：采用反应精馏技术以乙二醇和乙酸仲丁酯为原料,通过酯交换合成乙二醇二乙酸酯。使用Aspen Plus对反应精馏塔进行模拟与优化,其结果为:操作压力为70 kPa,精馏段理论板数为4,反应段理论板数为15,提馏段理论板数为4,酯醇摩尔比为3∶1,回流比为2,该条件下,乙二醇转化率和塔釜乙二醇二乙酸酯质量分数达99%以上。在模拟基础上,进行反应精馏小试实验,最终确定全塔26节塔节,乙二醇和乙酸仲丁酯分别在第4节和第23节进料,全塔操作压力为70 kPa,酯醇摩尔比为3∶1。回流比为2,乙二醇转化率为98.17%,塔釜乙二醇二乙酸酯质量分数为97.54%。实验与模拟结果在误差范围内,验证了模拟计算的可靠性,为工业化提供了理论基础。The technology of reactive distillation was applied to synthesis ethylene glycol diacetate from ethylene glycol and secbutyl acetate.The process was simulated and optimized by Aspen Plus.The optimal conditions are as follows:the operating pressure is 70 kPa,theoretical plates numbers of distillation section is 4,theoretical plates numbers of reaction section is 15,theoretical plates numbers of stripping section is 4,the molar ratio of ester to alcohol is 3∶1,the reflux ratio is 2.Under this condition,both the conversion of ethylene glycol and the mass fraction of ethylene glycol diacetate in the column reactor are more than 99%.On the basis of simulation,the reaction distillation experiment was carried out.The 26-tower section of the experimental tower is finalized.Ethylene glycol and secbutyl acetate were fed in section 4 and 23,the operating pressure of the whole tower is 70 kPa.the molar ratio of ester to alcohol is 3∶1,the reflux ratio is 2.The conversion rate of ethylene glycol is 98.17%,the mass fraction of ethylene glycol diacetate in the column reactor is 97.54%.The experimental and simulation results were within the error range,which verified the reliability of the simulation and provided theoretical basis for industrialization.

关 键 词：反应精馏 乙二醇二乙酸酯 酯交换 过程模拟 小试实验 

分 类 号：TQ031.2[化学工程]