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    • 2. 发明授权
    • Multi-stage process for producing polyethylene
    • 生产聚乙烯的多阶段工艺
    • US5326835A
    • 1994-07-05
    • US920569
    • 1992-08-20
    • Antero AhvenainenKari SarantilaHenrik AndtsjoJouni TakakarhuAri Palmroos
    • Antero AhvenainenKari SarantilaHenrik AndtsjoJouni TakakarhuAri Palmroos
    • C08F2/00B01J8/24B01J19/24C08F2/06C08F2/34C08F10/00C08F10/02C08F110/02C08F297/08C08L23/08
    • C08F297/083B01J19/2435B01J8/24C08F110/02Y02P20/544Y10S526/905
    • The invention concerns a multi-stage process for producing polyethylene having a bimodal and/or broad molecular weight distribution in the presence of an ethylene polymerizing catalyst system in a multistep reaction sequence, in which the first reaction step is a liquid phase polymerization step and the second reaction step is formed by one or more gas-phase polymerization steps. According to the process of the invention in the first reaction step ethylene is polymerized in a loop reactor (10) in an inert low-boiling hydrocarbon medium the residence time being at least 10 minutes, reaction mixture is discharged from the loop reactor (10) and at least a substantial part of the inert hydrocarbon mixture is separated and the polymer is transferred into one or more gas-phase reactors (30), where the polymerization is completed in the presence of ethylene and optionally hydrogen and a comonomer. As an inert hydrocarbon medium in the loop reactor (10) propane can be used and the polymerization can be carried out also so that the mixture of inert hydrocarbon, monomer, hydrogen and optional comonomer is under supercritical conditions.
    • PCT No.PCT / FI91 / 00406 Sec。 371日期:1992年8月20日 102(e)日期1992年8月20日PCT 1991年12月20日PCT PCT。 出版物WO92 / 12182 日本1992年7月23日。本发明涉及在多步反应序列中在乙烯聚合催化剂体系存在下生产具有双峰和/或宽分子量分布的聚乙烯的多阶段方法,其中第一反应步骤为 通过一个或多个气相聚合步骤形成液相聚合步骤和第二反应步骤。 根据本发明在第一反应步骤中的方法,乙烯在环状反应器(10)中在惰性低沸点烃介质中聚合,停留时间为至少10分钟,反应混合物从环管反应器(10)排出, 并且将至少大部分惰性烃混合物分离并将聚合物转移到一个或多个气相反应器(30)中,其中聚合在乙烯和任选的氢气和共聚单体存在下完成。 作为环管反应器(10)中的惰性烃介质,可以使用丙烷,也可以进行聚合,使得惰性烃,单体,氢和任选的共聚单体的混合物处于超临界条件下。
    • 3. 发明申请
    • Process for Producing Polyethylene
    • 生产聚乙烯的方法
    • US20080045674A1
    • 2008-02-21
    • US10592638
    • 2005-04-28
    • Henrik Andtsjo
    • Henrik Andtsjo
    • C08F110/02B01J19/24C08F2/06C08F10/02
    • C08F10/02C08F110/02C08F2/14
    • Process and apparatus for continuously producing olefin polymers in a slurry phase reactor in a hydrocarbon diluent or liquid monomer. The process comprises continuously withdrawing from the slurry phase reactor a polymer slurry containing polymer and a fluid phase, which contains hydrocarbons and optionally hydrogen, and concentrating the slurry with a self-cleaning screen by removing a part of the fluid phase to provide a concentrated slurry. The openings of the screen, which can have a planar or cylindrical configuration, are smallest at the inflow surface of the screen and increases towards the outflow surface. By the present invention, the need for service and maintenance is significantly reduced.
    • 在烃稀释剂或液体单体中的淤浆相反应器中连续生产烯烃聚合物的方法和设备。 该方法包括连续地从淤浆相反应器中取出含有聚合物的聚合物浆料和含有烃和任选的氢的流体相,并通过除去一部分流体相使自清洁筛网浓缩浆料以提供浓缩浆料 。 屏幕的开口可以具有平面或圆柱形构造,在屏幕的流入表面处最小,并朝着流出表面增加。 通过本发明,显着地减少了对服务和维护的需求。