发明授权
- 专利标题: Process for the polymerization of ethylene
- 专利标题(中): 乙烯聚合方法
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申请号: US10568739申请日: 2004-07-19
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公开(公告)号: US07514508B2公开(公告)日: 2009-04-07
- 发明人: Gerben Meier , Massimo Covezzi , Pietro Baita , Gabriele Mei
- 申请人: Gerben Meier , Massimo Covezzi , Pietro Baita , Gabriele Mei
- 申请人地址: IT Milan
- 专利权人: Basell Poliolefine Italia s.r.l.
- 当前专利权人: Basell Poliolefine Italia s.r.l.
- 当前专利权人地址: IT Milan
- 代理商 William R. Reid
- 优先权: EP03077645 20030820
- 国际申请: PCT/EP2004/008063 WO 20040719
- 国际公布: WO2005/019280 WO 20050303
- 主分类号: C08F2/38
- IPC分类号: C08F2/38 ; C08F2/34 ; C08F210/02
摘要:
Process for preparing a broad molecular weight polyethylene by polymerizing ethylene in the presence of a polymerization catalyst, the process comprising the following steps, in any mutual order: a) polymerizing ethylene, optionally together with one or more α-olefinic comonomers having from 3 to 12 carbon atoms, in a gas-phase reactor in the presence of hydrogen, b) copolymerizing ethylene with one or more α-olefinic comonomers having from 3 to 12 carbon atoms in another gas-phase reactor in the presence of an amount of hydrogen less than step a), where in at least one of said gas-phase reactors the growing polymer particles flow upward through a first polymerization zone under fast fluidization or transport conditions, leave said first polymerization zone and enter a second polymerization zone through which they flow downward under the action of gravity.
公开/授权文献
- US20070093621A1 Process and apparatus for the polymerization of ethylene 公开/授权日:2007-04-26