Study on ethylene oligomerization with a new diimine pyridine iron-based catalyst

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	Study on ethylene oligomerization with a new diimine pyridine iron-based catalyst
	Ma, Z ; Sun, WH ; Wang, H ; Yang, WD ; Hu, YL
刊名	ACTA POLYMERICA SINICA
	2002-10-01
期号	5 页码:703-706
关键词	Diimine Pyridine Iron Based Catalyst Ethylene Oligomerization Carbon-number Distribution Of Product Alpha-olefin Selectivity For Alpha-olefin
ISSN号	1000-3304
英文摘要	A new iron based catalyst 2,6-bis[(1-fluorenylimino) ethyl] pyridine iron dicloride (2) was synthesized via Shiff base condensation with 2, 6-diacetylpyridine and 9-aminofluorene hydrochloride under formic acid as catalyst. Ethylene oligomerizations were carried out using this new catalyst and methylaluminoxane as cocatalyst under various conditions. The effects of Al/Fe molar ratio, reaction temperature and ethylene pressure on catalytic activity and product distribution were investigated. This novel catalyst had a good activity for ethylene oligomerization (e.g. 4.21 x 10(6) g oligomers.mol(-1) Fe.h(-1), Al/Fe molar ratio = 2000, reaction temperature = 40degreesC, ethylene pressure = 1.5 MPa). The catalytic activity increased with the increasing concentration of MAO. The tendency to produce more C-4 similar to C-10 olefins was attributed to the more chain transfer reactions to MAO. The higher the reaction temperature, the lower catalytic activity was present. The reasonable explanation was the combination of the accelerated catalyst's deactivation and the decrease in ethylene concentration in solvent due to the elevated temperature. Under such condition, however, the oligomerization of ethylene produced more short chain olefins which are adapted to act as comonomers for preparation of linear low density polyethylene materials. Ethylene pressure in autoclave also had an important influence on catalytic activity and carbon-number distribution of product. The catalytic activity increased sharply with the elevated ethylene pressure. However, the proportion of C-4 similar to C-10 olefins in product decreased in higher pressure due to the enhanced chain propagation reaction. The research work indicated that the control of catalytic activity and product distribution can be realized by the variation of oligomerization conditions such as Al/Fe molar ratio, reaction temperature and ethylene pressure. The results also showed that the ethylene oligomerization employing this novel iron-based catalyst mainly produces the C-4 similar to C-10 olefins with high selectivity for linear C-4 similar to C-10 alpha-olefin (>98 %).
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000178936800032
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/78791]
专题	中国科学院化学研究所
通讯作者	Ma, Z
作者单位	1.Chinese Acad Sci, State Key Lab Engn Phys, Ctr Mol Sci, Inst Chem, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Hebei Univ Technol, Inst Polymer Sci & Engn, Coll Chem Engn, Tianjin 300130, Peoples R China 4.Chinese Natl Petr Corp, Beijing Lab Catalysis, Key Lab Catalysis, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Ma, Z,Sun, WH,Wang, H,et al. Study on ethylene oligomerization with a new diimine pyridine iron-based catalyst[J]. ACTA POLYMERICA SINICA,2002(5):703-706.
APA	Ma, Z,Sun, WH,Wang, H,Yang, WD,&Hu, YL.(2002).Study on ethylene oligomerization with a new diimine pyridine iron-based catalyst.ACTA POLYMERICA SINICA(5),703-706.
MLA	Ma, Z,et al."Study on ethylene oligomerization with a new diimine pyridine iron-based catalyst".ACTA POLYMERICA SINICA .5(2002):703-706.