【作者】 张华良； 袁华；

【Author】 Hualiang Zhang;Hua Yuan;Key Laboratory for Green Chemical Process of Ministry of Education,School of Chemical and Environmental Engineering,Wuhan Institute of Technology;

【机构】 武汉工程大学化学与环境工程学院绿色化工过程教育部重点实验室；

【摘要】 乙二胺是重要的有机化工原料。根据原料的不同,乙二胺的主要合成方法有二氯乙烷法（EDC）、乙醇胺化法（MEA）、环氧乙烷法（EO）^[1-3]。其中,EDC法存在产品质量差、设备腐蚀严重和三废排放量大等缺点;MEA法反应压力较高,对设备要求苛刻。本工作采用乙二醇和氨气为原料,双组分Ni-Cu/Al₂O₃为催化剂,对乙二醇进行催化氨化制备乙二胺,采用气相色谱法对反应混合物进行分析检测,考察了催化剂组成、反应物物料比、反应温度、反应压力和反应时间等因素对产物收率的影响,并对哌嗪、二元胺和烯胺等副产物的产生原因进行了分析。通过单因素实验确定了合成乙二胺的最佳反应条件:在催化剂组成质量比组分Ni/Cu=3:1、催化剂质量分数3%、氨醇质量比4:1、反应温度180℃、反应压力0.6MPa、反应时间4h的条件下,乙二胺的产率为38.56%。初步实验结果表明,该工艺过程路线简捷,环境友好,具有潜在的工业应用前景。更多还原

【Abstract】 Dichloro ethane（EDC） method has the disadvantages of poor product quality,equipment corrosion and environmental pollution.Ethanolamine（MEA） method requires high reaction pressure and special equipment.In this work,ethylenediamine was prepared by catalytic amination of ethylene glycol in the presence of Ni-Cu/Al₂O₃catalyst.The reaction mixture was analyzed by gas chromatography.The effects of catalyst composition,reactant ratio,reaction temperature,reaction pressure and reaction time on the yield of the product were investigated.The formation mechanism of by-products such as piperazine and allyl amine were analyzed.The yield of ethylene diamine could reach 38.56%under the condition of mole ratio Ni/Cu=3:1,amount of catalysts 3%（w）,NH₃/HOCH₂CH₂OH mole ratio 4:1,temperature 180℃,pressure 0.6Mpa and reaction time 4h.The results show that the process is simple,environmentally friendly,and has a potential industrial prospects.更多还原