双吡啶Schiff碱配体/Cr(Ⅲ)/甲基铝氧烷催化乙烯齐聚  

CATALYTIC ETHYLENE OLIGOMERIZATION OVER BIPYRIDINE Schiff BASE LIGAND/Cr(Ⅲ)/MAO

作　　者：范琳琳[1] 张乐[1] 陈延辉[1] 姜涛[1] 

机构地区：[1]天津科技大学化工与材料学院,天津300457

出　　处：《精细石油化工》2016年第3期6-10,共5页Speciality Petrochemicals

基　　金：国家自然科学基金委员会--中国石油天然气集团公司石油化工联合基金资助项目(U1162114);教育部优秀人才支持计划资助项目(NECT-07-0142)

摘　　要：合成并表征了三种新型双吡啶Schiff碱配体（Ligand1、Ligand2、Ligand3）。以甲苯为反应溶剂,研究了配体L1、L2、L3分别与CrCl3（THF）3和助催化剂甲基铝氧烷（MAO）原位合成催化剂后催化乙烯齐聚的性能。实验结果表明,随着反应温度和n（Al）/n（Cr）的升高,催化反应体系的活性呈先增大后减小的趋势;配体的结构对催化体系的反应活性有显著影响,N取代基上引入S原子（L2）,会导致催化活性降低。在反应温度为80℃,n（Al）/n（Cr）=800,乙烯聚合压力为1.0 MPa的条件下,L3/CrCl3（THF）3/MAO催化乙烯齐聚的反应活性高达1.22×10^6 g/（mol·h）,产物为高纯线性α-烯烃,且没有聚乙烯生成。Three new bipyridine Schiff base ligands（L1,L2 and L3）were synthesized and characterized.Catalysts were prepared with the above ligands,CrCl3（THF）3and cocatalyst methyl aluminoxane（MAO）,and the catalytic ethylene oligomerization performance of these catalysts were investigated with toluene as solvent.It has been shown that the catalytic activity increased at first,and then decreased with the temperature and n（Al）/n（Cr）ratio.And the ligand structure had a significant effect on the catalytic activity of the catalysts.Introducing S atom into N substituent（L2）would decrease the ethylene oligomerization activity of the catalysts.For the L3/CrCl3（THF）3/MAO catalyst,the catalytic activity could reach 1.22×10^6 g/（mol·h）when the reaction temperature was 80 ℃,n（Al）/n（Cr）was 800 and the reaction pressure was 1.0MPa.And theproducts were high-purity linearα-olefins and there was no polyethylene generated.

关 键 词：双吡啶基配体 铬(Ⅲ)化合物 甲基铝氧烷 乙烯齐聚 

分 类 号：O643.36[理学—物理化学]