Chinese Journal of Catalysis ›› 2006, Vol. 27 ›› Issue (5): 416-420.

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Synthesis of Diphenylphosphinoamine Ligands and Their Catalytic Performance for Ethylene Tetramerization with Cr(Ⅲ) Compounds

ZHANG Baojun1,2, WANG Yanji1*, JIANG Tao3, XING Lihua2   

  1. 1 School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China; 2 Research Institute of Daqing Petrochemical Company, PetroChina Company Limited, Daqing 163714, Heilongjiang, China; 3 School of Chemistry and Chemical Engineering, Daqing Petroleum Institute, Daqing 163318, Heilongjiang, China
  • Received:2006-05-25 Online:2006-05-25 Published:2006-05-25

Abstract: Diphenylphosphinoamine ligands were synthesized by reacting bis(phenyl)phosphorus chloride with diamines. They exhibited exceptionally high selectivity (up to 73.1%) towards 1-octene and catalytic activity for ethylene tetramerization in the presence of Cr(Ⅲ) compounds (chromium chloride tetrahydrofuran or chromium acetyl acetonate) and methylaluminoxane. Besides the target product 1-octene, main side-products such as 1-hexene, methylcyclopentane, and methylenecyclopentane are also valuable. The activity and the selectivity for 1-octene are dependent on the catalyst ligand structure and the reaction conditions such as reaction temperature, pressure, and the Al/Cr molar ratio, while the Cr(Ⅲ) compounds have nearly no effect on them.

Key words: chromium, diphenylphosphinoamine, ethylene, tetramerization, octene