Process for treating polyolefin particles obtained by gas-phase polymerization
    2.
    发明授权
    Process for treating polyolefin particles obtained by gas-phase polymerization 有权
    用于处理通过气相聚合获得的聚烯烃颗粒的方法

    公开(公告)号:US09458259B2

    公开(公告)日:2016-10-04

    申请号:US14650532

    申请日:2013-12-11

    Abstract: Process for treating polyolefin particles obtained by gas-phase polymerization of one or more olefins in the presence of a polymerization catalyst system and a C3-C5 alkane as polymerization diluent in a gas-phase polymerization reactor, the process comprising the steps of a) discharging the polyolefin particles continuously or discontinuously from the gas-phase polymerization reactor and transferring the particles to a first degassing vessel; b) contacting therein the polyolefin particles with a gaseous stream comprising at least 85 mol-% of C3-C5 alkane while the polyolefin particles have an average residence time in the first degassing vessel of from 5 minutes to 5 hours; c) transferring the polyolefin particles to a second degassing vessel; d) contacting therein the polyolefin particles with a stream comprising nitrogen and steam while the polyolefin particles have an average residence time in the second degassing vessel of from 5 minutes to 2 hours, wherein the contacting is carried out at conditions under which no condensation of water occurs; e) transferring the polyolefin particles to a third degassing vessel; f) contacting therein the polyolefin particles with a stream of nitrogen while the polyolefin particles have an average residence time in the third degassing vessel of from 5 minutes to 8 hours, and processes for preparing polyolefin polymers by gas-phase polymerization of one or more olefins in the presence of a polymerization catalyst system and a C3-C5 alkane as polymerization diluent in a gas-phase polymerization reactor, wherein the obtained polyolefin particles are subjected to such a treating process.

    PROCESS FOR TREATING POLYOLEFIN PARTICLES OBTAINED BY GAS-PHASE POLYMERIZATION
    7.
    发明申请
    PROCESS FOR TREATING POLYOLEFIN PARTICLES OBTAINED BY GAS-PHASE POLYMERIZATION 有权
    用于处理由气相聚合获得的聚烯烃颗粒的方法

    公开(公告)号:US20150322178A1

    公开(公告)日:2015-11-12

    申请号:US14650532

    申请日:2013-12-11

    Abstract: Process for treating polyolefin particles obtained by gas-phase polymerization of one or more olefins in the presence of a polymerization catalyst system and a C3-C5 alkane as polymerization diluent in a gas-phase polymerization reactor, the process comprising the steps of a) discharging the polyolefin particles continuously or discontinuously from the gas-phase polymerization reactor and transferring the particles to a first degassing vessel; b) contacting therein the polyolefin particles with a gaseous stream comprising at least 85 mol-% of C3-C5 alkane while the polyolefin particles have an average residence time in the first degassing vessel of from 5 minutes to 5 hours; c) transferring the polyolefin particles to a second degassing vessel; d) contacting therein the polyolefin particles with a stream comprising nitrogen and steam while the polyolefin particles have an average residence time in the second degassing vessel of from 5 minutes to 2 hours, wherein the contacting is carried out at conditions under which no condensation of water occurs; e) transferring the polyolefin particles to a third degassing vessel; f) contacting therein the polyolefin particles with a stream of nitrogen while the polyolefin particles have an average residence time in the third degassing vessel of from 5 minutes to 8 hours, and processes for preparing polyolefin polymers by gas-phase polymerization of one or more olefins in the presence of a polymerization catalyst system and a C3-C5 alkane as polymerization diluent in a gas-phase polymerization reactor, wherein the obtained polyolefin particles are subjected to such a treating process.

    Abstract translation: 在气相聚合反应器中,在聚合催化剂体系和C3-C5烷烃作为聚合稀释剂的存在下,通过一种或多种烯烃的气相聚合得到的聚烯烃颗粒的处理方法,该方法包括以下步骤:a) 聚烯烃颗粒从气相聚合反应器连续或不连续地转移并转移到第一脱气容器中; b)使聚烯烃颗粒与包含至少85mol%的C 3 -C 5烷烃的气流接触,同时聚烯烃颗粒在第一脱气容器中的平均停留时间为5分钟至5小时; c)将聚烯烃颗粒转移到第二脱气容器; d)使聚烯烃颗粒与包含氮气和蒸汽的物流接触,同时聚烯烃颗粒在第二脱气容器中的平均停留时间为5分钟至2小时,其中接触是在没有水冷凝的条件下进行的 发生; e)将聚烯烃颗粒转移到第三脱气容器; f)使聚烯烃颗粒与氮气流接触,同时聚烯烃颗粒在第三脱气容器中的平均停留时间为5分钟至8小时,以及通过一种或多种烯烃的气相聚合制备聚烯烃聚合物的方法 在气相聚合反应器中存在聚合催化剂体系和作为聚合稀释剂的C 3 -C 5烷烃的情况下,将得到的聚烯烃颗粒进行这样的处理。

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