PROCESS FOR PREPARING OLEFIN POLYMER BY SLURRY LOOP POLYMERIZATION HAVING HIGH POWDER DENSITY
    3.
    发明申请
    PROCESS FOR PREPARING OLEFIN POLYMER BY SLURRY LOOP POLYMERIZATION HAVING HIGH POWDER DENSITY 有权
    通过具有高浓度密度的浆料环聚合制备烯烃聚合物的方法

    公开(公告)号:US20140316082A1

    公开(公告)日:2014-10-23

    申请号:US14364977

    申请日:2012-12-04

    Abstract: The instant invention pertains to a process for preparing an ethylene homo- or copolymer in the presence of a supported chromium catalyst by slurry loop polymerization or copolymerization, whereby the resulting polymer powder has an increased powder density, in which the supported chromium catalyst has a chromium content of from 0.01 to 5 wt.-%, based on the element in the finished catalyst, and shows a particle size distribution measured according to ISO 13320-2009 comprising two main fractions one of which having a d50 of from 15 to 40 μm and the other having a d50 of from 45 to 80 μm said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 μm.

    Abstract translation: 本发明涉及在负载型铬催化剂存在下通过淤浆环聚合或共聚合制备乙烯均聚物或共聚物的方法,由此得到的聚合物粉末具有增加的粉末密度,其中负载的铬催化剂具有铬 基于成品催化剂中的元素含量为0.01至5重量%,并且显示根据ISO 13320-2009测量的粒度分布,其包含两个主要部分,其中一个具有15至40μm的d 50,以及 另一个具有45至80μm的d 50,所述催化剂的特征还在于其小于10重量%的催化剂颗粒的直径小于20μm的事实。

    Olefin polymerization process
    7.
    发明授权

    公开(公告)号:US10202472B1

    公开(公告)日:2019-02-12

    申请号:US16079229

    申请日:2017-02-23

    Abstract: A process for the preparation of an ethylene polymer including the step of polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a Phillips-type chromium catalyst in a gas-phase polymerization reactor containing a reactor bed of particulate polymer, wherein the gas-phase polymerization reactor is equipped with a cycle gas line, wherein the reactor gas returned to the polymerization reactor through the cycle gas line has been condensed in part and the amount of liquid in the returned reactor gas is from 0.5 wt. % to 10 wt. % based upon the total weight of the reactor gas/liquid composition, the polymerization is carried out at from 108° C. to 125° C., and an aluminum alkyl is fed into the polymerization reactor in an amount in the range of from 0.0025 mole to 0.1 mole per ton of dosed ethylene.

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