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    Polymerization reactor system comprising at least one withdrawal valve
    5.
    发明授权
    Polymerization reactor system comprising at least one withdrawal valve 有权

    公开(公告)号：US11708425B2

    公开(公告)日：2023-07-25

    申请号：US16646767

    申请日：2018-11-02

    申请人： Borealis AG

    发明人： Christof Wurnitsch ,  Sameer Vijay ,  Erno Elovainio

    IPC分类号： C08F2/01 ,  B01J4/00 ,  B01J19/18 ,  B01J19/24 ,  C08F10/00

    CPC分类号： C08F2/01 ,  B01J4/001 ,  B01J4/008 ,  B01J19/1837 ,  B01J19/2435 ,  C08F10/00 ,  B01J2204/005

    摘要： Described herein is a polymerization reactor system comprising at least one loop reactor and/or at least one transfer line, and further comprising at least one withdrawal valve, wherein the at least one withdrawal valve is mounted to a wall of a lower horizontal segment of the loop reactor and/or to a wall of the transfer line, at an angle a of more than 0° and equal to or less than 85°, determined from perpendicular to a tangent of the wall at the mounting position in flow direction of a slurry in the loop reactor and/or in the transfer line. The valve piston of the at least one withdrawal valve comprises a valve plate at an end directed to the at least one loop reactor and/or at an end directed to the at least one transfer line, the valve plate being shaped according to an inner wall of the at least one loop reactor and/or according to an inner wall of the at least one transfer line such that the valve piston is flush with the inner wall of the at least one loop reactor and/or with the inner wall of the at least one transfer line in a closed position of the withdrawal valve. By using such a withdrawal valve, a limitation of the effective withdrawal area can be avoided or at least be reduced such that the liquid slurry can efficiently be withdrawn and the risk of plugging is reduced. Further disclosed is a method for producing an olefin polymer in the inventive polymerization reactor system.

    Process for the Preparation of Ethylene Polymers Using a Number of Reactors Arranged in Series
    8.
    发明申请
    Process for the Preparation of Ethylene Polymers Using a Number of Reactors Arranged in Series 审中-公开

    公开(公告)号：US20190194371A1

    公开(公告)日：2019-06-27

    申请号：US16291354

    申请日：2019-03-04

    申请人： Total Research & Technology Feluy

    发明人： Mieke Dams ,  Daniel Siraux

    IPC分类号： C08F210/16 ,  C08F10/00

    CPC分类号： C08F210/16 ,  C08F4/24 ,  C08F4/65912 ,  C08F4/65927 ,  C08F10/00 ,  C08F110/02 ,  C08F4/65916 ,  C08F2/001 ,  C08F2500/12 ,  C08F210/14

    摘要： The present invention relates to a process for the preparation of ethylene polymers using a number of reactors arranged in series comprising the steps in whicha) ethylene, a diluent, a catalyst, a co-catalyst and optionally comonomers and hydrogen are introduced into a first reactor, b) polymerization of ethylene and optionally comonomers is carried out in the reaction mixture of said first reactor to make ethylene polymers, c) reaction mixture is discharged from said first reactor, d) said reaction mixture and fresh ethylene and optionally comonomers and hydrogen are introduced into the consecutive reactor to make additional ethylene polymers, e) said reaction mixture is discharged from said consecutive reactor and introduced into the further consecutive reactor, if any, with fresh ethylene and optionally comonomers and hydrogen to make additional ethylene polymers, steps c) and d) are repeated until the last reactor of the series, f) reaction mixture is discharged from last reactor of the series and ethylene polymers are recovered, wherein, additional co-catalyst is injected in at least a subsequent reactor of the series. Advantage of the process of the present invention is mainly to decrease catalyst consumption for the same polyethylene production, in other words to increase the productivity. In a most preferred embodiment the process of the present invention is carried out in two loop reactors under slurry conditions.