连续催化胺化制备四甲基乙二胺催化剂

摘要

A compound catalyst with Cu/Ni as the main activate component is applied for continuous catalytic amination DMEA to TMEDA. The influences of catalyst carrier type,Cu/Ni molar ratio, loading amount,additives,roasting time and temperature on the performance of the catalyst were investigated. The best preparation conditions of the catalyst were as follows:with theγ-Al2O3 ball as the carrier,Cu:Ni:Mn=4:1:0.2(mole ratio),the load amount 20%,and roasting 6h at 500℃. Under the conditions of the reaction temperature of 240℃,atmospheric pressure,amine alcohol molar ratio 1:1,space velocity of 0.12h–1,hydrogen speed of 30 mL/min,the conversion rate of DMEA and the selectivity of TMEDA could achieve 92.8% and 82.9%,respectively. Through 500h life test,the conversion rate and selectivity were stable and maintained at above 90% and 80%,respectively. The experimental results showed that the catalyst had excellent catalytic activity and stability.%以Cu/Ni为主活性组分,研制出适合于N,N-二甲基乙醇胺(DMEA)固定床连续催化胺化制备N,N,N',N'-四甲基乙二胺(TMEDA)复合催化剂.考察了催化剂载体类型、铜镍摩尔比、负载量、助剂、焙烧温度和时间等因素对催化剂性能的影响.通过实验得出催化剂较佳的制备条件为:以 γ-Al2O3球为载体,摩尔比Cu:Ni:Mn=4:1:0.2,负载量20%,500℃下焙烧6h.在反应温度240℃、常压、胺醇摩尔比1:1、空速0.12h–1、氢气流量30mL/min反应条件下,DMEA转化率和TMEDA选择性分别达到92.8%和82.9%;通过固定床连续500h寿命测试,转化率和选择性分别稳定在90%和80%以上,显示催化剂具有较好的催化活性和稳定性.