氢氛下萘异丙基化提高催化剂的活性  

Enhancement of catalyst activity in isopropylation of naphthalene in hydrogen atmosphere

作　　者：赵桂利[1] 田正华[1] 王沛[2] 贾宏敏[1] 李犇[1] 

机构地区：[1]鞍山科技大学化工学院,辽宁鞍山114044 [2]大连理工大学化工学院,辽宁大连116012

出　　处：《化工学报》2005年第9期1694-1698,共5页CIESC Journal

基　　金：鞍山市科技基金项目(032042)

摘　　要：Isopropylation of naphthalene is a series reaction, which results in a variety of isomers having different alkylation levels.Among them, 2,6-diisopropylnaphthalene （2,6-DIPN） is a raw material for the production of advanced polyester materials such as PEN and liquid crystal polymers.In this study, the preparation of 2,6-DIPN through the isopropylation of industrial refined naphthalene with propylene was conducted in 0.5 L autoclave with steam dealuminated H-mordenite （SDHM） as the shape-selective catalyst instead of the conventional Friedel-Crafts catalysts and resulted in high selectivity and high yield of 2,6-DIPN.In order to slacken the deactivation of HM, the reaction was carried out in H2 atmosphere.The dehydrogenation of fused-ring polycyclics could be minimized and coke formation could be reduced.The preferred reaction conditions found were temperature of 275—300 ℃,hydrogen pressure of 0.4 MPa,reaction time of 7—8 h and 6%—7% of SDHM by mass,in which no side reactions were observed. From NH3-TPD profiles,it could be seen that the relative strength of strong acid sites of SDHM in hydrogen isopropylation was greater than that in nitrogen isopropylation after the same reaction period.Comparing with the results obtained in nitrogen atmosphere, the conversion of refined naphthalene and yield of 2,6-DIPN could be remarkably increased to an average value as high as 90 % and 35 % respectively.Hence the catalytic activity of SDHM could be maintained for a longer time in H2 atmosphere.Isopropylation of naphthalene is a series reaction, which results in a variety of isomers having different alkylation levels. Among them, 2,6-diisopropylnaphthalene （2,6-DIPN） is a raw material for the production of advanced polyester materials such as PEN and liquid crystal polymers. In this study, the preparation of 2,6-DIPN through the isopropylation of industrial refined naphthalene with propylene was conducted in 0.5 L autoclave with steam dealuminated H-mordenite （SDHM） as the shape-selective catalyst instead of the conventional Friedel-Crafts catalysts and resulted in high selectivity and high yield of 2,6-DIPN. In order to slacken the deactivation of HM, the reaction was carried out in H2 atmosphere. The dehydrogenation of fused-ring polycyclics could be minimized and coke formation could be reduced. The preferred reaction conditions found were temperature of 275-300℃, hydrogen pressure of 0.4 MPa, reaction time of 7-8 h and 6%-7% of SDHM by mass, in which no side reactions were observed. From NH3-TPD profiles, it could be seen that the relative strength of strong acid sites of SDHM in hydrogen isopropylation was greater than that in nitrogen isopropylation after the same reaction period. Comparing with the results obtained in nitrogen atmosphere, the conversion of refined naphthalene and yield of 2,6- DIPN could be remarkably increased to an average value as high as 90% and 35 % respectively. Hence the catalytic activity of SDHM could be maintained for a longer time in H2 atmosphere.

关 键 词：萘 2 6-二异丙基萘 氢氛下异丙基化 水汽脱铝氢型丝光沸石 

分 类 号：O643.36[理学—物理化学]