原位液相催化加氢法合成N-乙基苯胺和N,N-二乙基苯胺  

In Situ Liquid-Phase Catalytic Hydrogenation for the Synthesis of N-Ethylaniline and N,N-Diethylaniline

作　　者：沈颖旎[1] 罗智伟[1] 严新焕[1] 

机构地区：[1]浙江工业大学绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《催化学报》2008年第7期612-616,共5页

基　　金：国家自然科学基金(20676124)

摘　　要：以硝基苯为原料,Pt/γ-Al2O3为催化剂,乙醇水溶液为溶剂和氢供体,采用原位液相加氢一步法合成了N-乙基苯胺和N,N-二乙基苯胺.采用低温N2吸附-脱附、电感耦合等离子体发射光谱、X射线衍射、程序升温化学吸附和透射电子显微镜等对Pt/γ-Al2O3催化剂进行了表征,并考察了所制备催化剂的原位液相加氢性能.结果表明,在温度为503K、压力为5.0MPa、空速为3.2h-1、溶剂水含量为30%以及硝基苯浓度为8%的反应条件下,在Pt/γ-Al2O3催化剂上原位液相加氢合成N-乙基苯胺及N,N-二乙基苯胺有较好的结果,硝基苯转化率达到100%,N-乙基苯胺和N,N-二乙基苯胺的总收率达到99.5%.讨论了硝基苯原位液相加氢合成N-乙基苯胺和N,N-二乙基苯胺的反应机理.In situ liquid-phase hydrogenation of nitrobenzene for the synthesis of N-ethylaniline and N, N-diethylaniline in ethanol-water solution over the Pt/γ-Al2O3 catalyst was studied. The Pt/γ-Al2O3 catalyst was characterized by N2 adsorption-desorption, inductively coupled plasma atomic emission spectrometry, X-ray diffraction, temperature-programmed desorption, and transmission electron microscopy. The results of the reaction showed that under the conditions of 503 K, 5.0 MPa, 3.2 h^-1, and 8 % nitrobenzene concentration with 70 % ethanol and 30 % H2O solution, the nitrobenzene conversion reached 100 %, and the total yield of N-ethylaniline and N, N-diethylaniline reached as high as 99.5 %. The reaction mechanism was discussed.

关 键 词：铂 氧化铝 硝基苯 原位液相催化加氢 N-乙基苯胺 N N-二乙基苯胺 乙醇 

分 类 号：TQ246[化学工程—有机化工]