乙二胺直接环化产物的分离与模拟

提出以甲苯为共沸剂去除混合溶液中的乙二胺和结晶水的间歇共沸精馏法,最后得到质量分数为96.79%的哌嗪及98.26%三乙烯二胺产品,并以水为萃取剂,实现共沸剂的回收利用。采用Aspen Plus化工模拟软件对精馏分离过程进行模拟计算,设计了4塔精馏分离及共沸剂回收的工业化实验装置,利用灵敏度分析模块对精馏塔各操作参数进行优化,从而获得质量分数分别为98.60%和99.20%的哌嗪和三乙烯二胺产品。

Separation and simulation of products from direct cyclization of ethylenediamine

With toluene as entrainer,the batch azeotropic distillation was put forward to remove the ethylenediamine and crystal water of the mixture.Piperazine with mass fraction of 96.79% and triethylenediamine with mass fraction of 98.26% were finally obtained,and the entrainer recycling was achieved with water as extraction solvent.Aspen Plus chemical process simulation software was applied to simulate the distillation process so as to design the industrial experimental device including four columns for distillation and separation with entrainer recycling.Sensitivity analytic module was used for operational parameters optimization of the column,and the mass fraction of piperazine and triethylenediamine obtained reaches 98.60% and 99.20% respectively.