苯胺铝-三乙胺盐酸盐/三氯化铝离子液体催化烷基化制备2,6-二异丙基苯胺的研究

目的]优化苯胺铝和Et3NH]Cl/AlCl3离子液体催化苯胺与丙烯烷基化反应条件。方法]考察了催化剂的组成和用量、苯胺/催化剂摩尔比、反应温度、反应压力以及反应时间等因素对反应结果的影响。结果]反应的较优条件为:n(Al)∶n(AlCl3)∶n(Et3HCl)=3∶1∶1,n(苯胺)/n(催化剂)=15∶1,反应温度为305～315℃,反应压力为4.0～8.0 MPa,苯胺转化率大于90%,2,6-二异丙基苯胺选择性大于50%。结论]与铝-三氯化铝混合催化剂相比,离子液体催化剂在较低反应温度和反应压力下均能有效提高烷基化反应的转化率和选择性。

Study on the Preparation of 2, 6-Diisopropylaniline Based on the Alkylation in Aluminum Anilide-[Et3NH]Cl/AlCl3 Ionic Liquids

Objective]The aim was to optimize alkylation reaction conditions of phenylamine with propene in aluminum anilide and Et_3NH]Cl/AlCl_3 ionic liquids.Method]The effect of catalyst composition and amount,phenylamine/catalysts mole ratio,reaction temperature,and pressure and reaction time on reaction results were investigated.Result]The better reaction conditions were: n(Al)∶n(AlCl3)∶n(Et3HCl)=3∶1∶1,n(anilide)/n(catalytic agent)=15∶1,and reaction temperature was among 305-315 ℃,moreover,the reaction pressure was among 4.0-8.0 MPa,the conversion rate of phenylamine and the selectivity of 2,6-dipropylaniline could be over 90% and 50%,respectively.Conclusion]Comparing with mixed catalyst of Al-AlCl3,ionic liquid catalyst could effectively improve the conversion and selectivity of alkylation reaction at relatively low temperature and pressure.