| 摘要 |
A multi-reactor solution process for polymerizing ethylene is disclosed. Ethylene is polymerized in a first reaction zone in two parallel reactors and the polyethylene is transferred to a second reaction zone to continue or complete the polymerization. Ethylene is contacted with a mixture of a titanium halide and a vanadium halide in the first parallel reactor and with a magnesium-titanium based Ziegler-Natta catalyst at a lower temperature in the second parallel reactor. The process gives improved catalyst activity.
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