循环法合成二乙醇胺工艺及条件的研究

Study on Synthetic Process and Condition of Diethanolamine by Cycle Method

提出在环氧乙烷与氨水反应之前,向反应器中加入事先合成的一乙醇胺,并依次将生成的一乙醇胺不断循环到反应器中合成二乙醇胺的方法。并按该循环法设计出一套反应过程易于控制、所得产品纯度高且安全卫生的试验设备。详细考察了温度、压力、氨烷比、循环次数对产物中二乙醇胺含量的影响。试验结果表明,温度为50℃,压力为0.5 MPa,氨烷比为4∶1,一乙醇胺循环5次,所得产物杂质含量较少,产物MEA、DEA、TEA摩尔比分布为13.1∶60.4∶20.8,环氧乙烷转化率可达到87.6%。

In this paper,it was proposed the method of synthetic diethanolamine.Before the reaction of epoxy ethane and ammonia,monoethanolamine which was previously synthesized was put into reactor in the cycle.A set of reaction equipment,which was easy to control,the product had high purity,and the operating process was safety and healthy,was designed.The influence factors of synthesis were studied and the experiment result showed that the product had less impurity content,the molar ratio of MEA∶DEA∶TEA was 13.1∶60.4∶20.8,epoxy ethane conversion percent was 87.6% when the reaction temperature was 50℃,the reaction pressure was 0.5MPa,NH3/EO was 4∶1 and monoethanolamine was circulated 5 times.