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    • 1. 发明授权
    • Process for preparing polyethylene
    • 制备聚乙烯的方法
    • US5684097A
    • 1997-11-04
    • US475842
    • 1995-06-07
    • Ari PalmroosAli HarlinAntero AhvenainenJouni TakakarhuAimo Sahila
    • Ari PalmroosAli HarlinAntero AhvenainenJouni TakakarhuAimo Sahila
    • C08F2/14B01J8/24B01J19/24C08F2/06C08F2/34C08F10/02C08F210/16
    • C08F10/02B01J19/2435B01J19/245B01J8/24B01J2219/00051B01J2219/00166B01J2219/00173C08F210/16
    • A process for producing polyethylene compositions in the presence of a catalytic system of ethylene polymerizing catalyst and cocatalyst in a multistage continuous reaction sequence consisting of successive liquid phase and gas phase polymerizations is disclosed. In the first step of the process, ethylene and optionally hydrogen and comonomer are polymerized in a first loop reactor in a low boiling hydrocarbon medium in the presence of ethylene polymerizing catalyst and cocatalyst. The reaction mixture is then removed and then transferred to a second loop reactor where polymerization is continued by addiing ethylene, hydrogen and optionally inert hydrocarbon, comonomers and cocatalysts. Thereafter, the reaction mixture is removed from the second loop reactor along with an essential part of the reaction medium and transferred to a gas phase reactor where polymerizing is continued in the presence of added ethylene and optionally hydrogen, comonomers and cocatalysts to form an end product. The residence time and reaction temperature being such that the proportion of the ethylene polymer produced in the first loop reactor to the end product of the process is between 1-20%.
    • 在由连续液相和气相聚合组成的多级连续反应序列中,在乙烯聚合催化剂和助催化剂催化体系存在下生产聚乙烯组合物的方法。 在该方法的第一步中,在乙烯聚合催化剂和助催化剂存在下,乙烯和任选的氢和共聚单体在第一回路反应器中在低沸点烃介质中聚合。 然后除去反应混合物,然后转移到第二环管反应器中,其中通过加入乙烯,氢气和任选的惰性烃,共聚单体和助催化剂继续聚合。 此后,将反应混合物与反应介质的主要部分一起从第二环管反应器中除去,并转移到气相反应器中,在气相反应器中,在加入的乙烯和任选的氢,共聚单体和助催化剂的存在下,继续聚合以形成最终产物 。 停留时间和反应温度使得在第一回路反应器中产生的乙烯聚合物与该方法的最终产物的比例为1-20%。
    • 7. 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。