Citation: WANG Jun, LIU Jinyi, CHEN Liduo, LAN Tianyu, WANG Libo. Synthesis and Ethylene Oligomerization Behavior of Hyperbranched Bispyridineimine Chromium Catalyst[J]. Chinese Journal of Applied Chemistry, ;2019, 36(7): 773-781. doi: 10.11944/j.issn.1000-0518.2019.07.180401 shu

Synthesis and Ethylene Oligomerization Behavior of Hyperbranched Bispyridineimine Chromium Catalyst

WANG Jun ^a,, ,
LIU Jinyi ^a ,
CHEN Liduo ^a ,
LAN Tianyu ^a ,
WANG Libo ^b

a.
Provincial Key Laboratory of Oil & Gas Chemical Technology, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
b.
Daqing Petrochemical Research Center, CNPC, Daqing, Heilongjiang 163312, China

Corresponding author: WANG Jun, wangjun1965@yeah.net
Received Date: 17 December 2018
Revised Date: 31 January 2019
Accepted Date: 6 March 2019

Fund Project: the National Key R & D Program of China 2017YFB0306701Supported by the National Key R & D Program of China(No.2017YFB0306701)

Figures(5)

A new hyperbranched bispyridineimine ligand was derived from 1.0 generation hyperbranched macromolecules and 2-chloro-4-methylpyridine through substitution reaction. Multinuclear chromium complex was synthesized from the reaction with chromium(Ⅲ) chloride tetrahydrofuran complex. The structure of hyperbranched bispyridineimine ligand and chromium complex were characterized by ultraviolet-visible spectrophotometer(UV-Vis), Fourier transform infrared spectroscopy(FT-IR), proton nuclear magnetic resonance(¹H NMR), and electrospray ionization mass spectrometer(ESI-MS) and elemental analysis. The result accords with what we designed theoretically. The novel hyperbranched chromium complex was evaluated as catalyst precursor in the ethylene oligomerization, using methylaluminoxane(MAO) as an activator. At the same time, we investigated the effects of reaction temperature, ethylene pressure, Al/Cr molar ratio, co-catalysts and solvents on the catalytic activity and product selectivity. The oligomerization results show that the activity of the catalyst is 1.32×10⁵ g/(mol(Cr)·h) and the selectivity for C₆ and C₈ reaches up to 59.30% at 45℃ and 4 MPa, Al/Cr molar ratio of 300 and 7 μmol catalyst loading with MAO as co-catalyst in toluene.
- 1.0 generation hyperbranched macromolecule,
- hyperbranched bispyridineimine ligand,
- chromium complex,
- ethylene oligomerization
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