Ethylene oligomerization catalyzed by PNP/Cr(III)/MAO in biphase systems

摘要: Ethylene oligomerization catalyzed by PNP/Cr(III)/MAO in biphase systems WANG Mei, SHI Pengfei, CHEN Yanhui, JIANG Tao (Material science and Chemical Engineering Institute, Tianjin University of Science Technology, 300457, China ) Abstract: In this paper, 1-n-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6])/ cyclohexane biphasic system was used for studying performance ethylene diphosphinoamine ligand (PNP)/Cr(III)/methylaluminoxane(MAO). The effect reaction temperature, Al/Cr molar ratio ionic liquid concentration on catalytic activity product distribution investigated. results show that compared with homogeneous catalysis system, the action active center has been changed from tetramerization to trimerization. 1-C6 selectivity is up 97.40%. exists organic solvent while catalyst dissolved liquids, which make separation recycle easy.