Abstract: Ethylenediamine was continuously prepared by dichlorethane under variable temperature conditions in a static mixing way. The influential factors of reaction were analyzed by single factor experiments, and the effects of the concentration of ammonia, system pressure and molar ratio of ammonia to dichlorethane on the reaction were evaluated by response surface methodology. The quadratic fitting equation between the yield of ethylenediamine and the influential factors was obtained, and these technical parameters were optimized. The results show that the three factors have obvious effect on the reaction, and the influential order from strong to weak is the molar ratio of ammonia to dichlorethane, concentration of ammonia, and system pressure. The optimal conditions obtained are: the length ratio of the first section to second one of high temperature reactor 1:1, the first pipe 130℃, the second pipe 110℃, reaction time 7 min, system pressure 4.61 MPa, concentration of ammonia 48.04%(w) and molar ratio of ammonia to dichlorethane 25.22. Under these conditions the yield of ethylenediamine is 76.49%.

Key words: static mixe, completely continuous process, non-isothermal, ethylenediamine, response surface methodology

摘要： 以静态混合方式，在变温条件下采用二氯乙烷法完全连续合成乙二胺，通过单因素实验分析二氯乙烷法合成乙二胺的影响因素，利用响应面法研究氨水浓度、反应压力、氨烷摩尔比对反应的影响，获得了乙二胺收率与影响因素的二次拟合方程，优化了工艺条件. 结果表明，氨水浓度、反应压力、氨烷摩尔比对反应均有显著影响，影响程度为：氨烷摩尔比>氨水浓度>反应压力. 优化工艺条件为：高温段反应器一段与二段的长度比1:1，一段温度130℃、二段温度110℃，停留时间7 min，反应压力4.61 MPa，氨水浓度48.04%(w)，氨烷摩尔比25.22，该条件下乙二胺收率达76.49%.

关键词: 静态混合, 完全连续过程, 变温, 乙二胺, 响应面法