SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (3): 530-534.

• • 上一篇    

Novel High Performance Ziegler-Natta Catalyst for Ethylene Slurry Polymerization

郭子芳1,2, 陈伟2, 周俊领2, 杨红旭2   

  1. 1. Department of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Sinopec Beijing Research Institute of Chemical Industry, Beijing 100013, China
  • 收稿日期:2008-12-25 修回日期:2009-04-16 出版日期:2009-06-28 发布日期:2009-06-28
  • 通讯作者: GUO Zifang,E-mail:guozf@brici.ac.cn

Novel High Performance Ziegler-Natta Catalyst for Ethylene Slurry Polymerization

GUO Zifang1,2, CHEN Wei2, ZHOU Junling2, YANG Hongxu2   

  1. 1. Department of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2. Sinopec Beijing Research Institute of Chemical Industry, Beijing 100013, China
  • Received:2008-12-25 Revised:2009-04-16 Online:2009-06-28 Published:2009-06-28

摘要: A novel high performance MgCl2/TiCl4 catalyst with tetrabutyloxsilicane as electron donor was prepared for ethylene slurry polymerization process. The properties of the catalyst such as particle size distribution, catalytic activity, hydrogen responsibility and copolymerization performance were investigated and compared with commercial catalyst (imported catalyst). Copolymerization of ethylene and 1-butylene using the catalyst was studied in a pilot plant. The composition, structure and property of the copolymer were characterized by 13C nuclear magnetic resonance (13C NMR) and gel permeation chromatography-Infrared (GPC-IR), and compared with those of the copolymer obtained from a commercial catalyst. In comparison with the commercial catalyst, the novel catalyst had a higher activity (up to 34.6 kg·g-1) and a better particle size distribution (PSD), and produced polymers having higher bulk density (up to 0.37 g·cm-3) with less fine resin. Meanwhile, the novel catalyst showed a higher hydrogen responsibility and better copolymerization performance. The results indicated that the copolymer obtained from the novel catalyst has a higher branch in the high molecular weight fraction and lower branch in the low molecular weight fraction.

关键词: Ziegler-Natta catalyst, polyethylene, slurry polymerization process, structure and properties

Abstract: A novel high performance MgCl2/TiCl4 catalyst with tetrabutyloxsilicane as electron donor was prepared for ethylene slurry polymerization process. The properties of the catalyst such as particle size distribution, catalytic activity, hydrogen responsibility and copolymerization performance were investigated and compared with commercial catalyst (imported catalyst). Copolymerization of ethylene and 1-butylene using the catalyst was studied in a pilot plant. The composition, structure and property of the copolymer were characterized by 13C nuclear magnetic resonance (13C NMR) and gel permeation chromatography-Infrared (GPC-IR), and compared with those of the copolymer obtained from a commercial catalyst. In comparison with the commercial catalyst, the novel catalyst had a higher activity (up to 34.6 kg·g-1) and a better particle size distribution (PSD), and produced polymers having higher bulk density (up to 0.37 g·cm-3) with less fine resin. Meanwhile, the novel catalyst showed a higher hydrogen responsibility and better copolymerization performance. The results indicated that the copolymer obtained from the novel catalyst has a higher branch in the high molecular weight fraction and lower branch in the low molecular weight fraction.

Key words: Ziegler-Natta catalyst, polyethylene, slurry polymerization process, structure and properties