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    Suspension process for preparing ethylene polymers comprising work-up of the suspension medium
    23.
    发明授权
    Suspension process for preparing ethylene polymers comprising work-up of the suspension medium 有权

    公开(公告)号：US12240923B2

    公开(公告)日：2025-03-04

    申请号：US17614708

    申请日：2020-05-28

    Applicant: Basell Polyolefine GmbH

    Inventor： Peter Rohrbach ,  Jürgen Perzlmeier ,  Elke Damm ,  Harald Prang

    IPC: C08F2/00 ,  B01D3/14 ,  B01D3/38 ,  B01D17/04 ,  C08F10/02 ,  C08F110/00 ,  C08F210/16

    Abstract: A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into wet ethylene polymer particles and mother liquor, transferring a part of the mother liquor into a work-up section including an evaporator for producing a wax-depleted portion of the mother liquor, a diluent distillation unit for producing isolated diluent from the wax-depleted portion of the mother liquor, and a wax removal unit operated by direct steam distillation for producing a gaseous hydrocarbon/steam mixture which is condensed and then separated into an aqueous phase and a hydrocarbon phase, wherein a first part of the hydrocarbon phase is transferred to the diluent distillation unit without passing the evaporator for producing the wax-depleted portion of the mother liquor.

    PROCESS FOR PREPARING ETHYLENE POLYMERS IN A SLURRY POLYMERIZATION
    24.
    发明申请
    PROCESS FOR PREPARING ETHYLENE POLYMERS IN A SLURRY POLYMERIZATION 有权

    公开(公告)号：US20250051497A1

    公开(公告)日：2025-02-13

    申请号：US18720775

    申请日：2022-12-20

    Applicant: Basell Polyolefine GMBH

    Inventor： Elke Damm ,  Harald Prang ,  Reinhard Kuehl

    IPC: C08F210/16 ,  C08F2/00 ,  C08F2/06

    Abstract: A process for polymerizing or copolymerizing ethylene in a slurry polymerization in a reactor system including a polymerization reactor, one or more first heat exchangers located outside the polymerization reactor, and a closed loop of a tempering medium for cooling or heating the first heat exchangers, which closed loop is equipped with second heat exchangers for cooling the tempering medium and third heat exchangers for heating the tempering medium, and wherein, during the polymerization, the slurry is cooled in the first heat exchangers, the temperature of the tempering medium cooling the first heat exchangers is in the range from 20° C. to 50° C., and the tempering medium is cooled in the second heat exchangers by a coolant, having a temperature from −20° to 45°° C.

    SUSPENSION PROCESS FOR PREPARING ETHYLENE POLYMERS COMPRISING WORKUP OF THE SUSPENSION MEDIUM
    26.
    发明申请
    SUSPENSION PROCESS FOR PREPARING ETHYLENE POLYMERS COMPRISING WORKUP OF THE SUSPENSION MEDIUM 有权

    公开(公告)号：US20230133399A1

    公开(公告)日：2023-05-04

    申请号：US17912618

    申请日：2021-03-19

    Applicant: Basell Polyolefine GmbH

    Inventor： Reinhard Kuehl ,  Volker Dolle ,  Peter Rohrbach ,  Elke Damm

    IPC: C08F6/00 ,  C08F10/02

    Abstract: A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

    SUSPENSION PROCESS FOR PREPARING ETHYLENE COPOLYMERS IN A REACTOR CASCADE
    28.
    发明申请
    SUSPENSION PROCESS FOR PREPARING ETHYLENE COPOLYMERS IN A REACTOR CASCADE 有权

    公开(公告)号：US20210198387A1

    公开(公告)日：2021-07-01

    申请号：US17252190

    申请日：2019-06-19

    Applicant: Basell Polyolefine GmbH

    Inventor： Elke Damm ,  Reinhard Kuehl ,  Rodrigo Carvajal

    IPC: C08F2/01 ,  C08F2/14 ,  C08F2/18 ,  C08F2/00 ,  C08F210/02 ,  C08F210/14 ,  C08F210/16 ,  C08F6/24

    Abstract: A process for preparing a multimodal ethylene copolymer in suspension in a reactor cascade including a first polymerization reactor and subsequent polymerization reactor(s) including polymerizing ethylene and C3-C12-1-alkenes and forming a suspension of multimodal ethylene copolymer particles in a suspension medium made from or containing a diluent, transferring the suspension into a separator, wherein the suspension is separated into multimodal ethylene copolymer particles and recovered suspension medium, purifying part of the recovered suspension medium for producing purified components of the recovered suspension medium, and recycling part of the purified components of the recovered suspension medium to the first polymerization reactor of the reactor cascade, wherein the purified components of the recovered suspension medium recycled to the first polymerization reactor and made from or containing the diluent, undergo catalytic hydrogenation before being introduced into the first polymerization reactor.

    Multi-reactor slurry polymerization processes with high ethylene purity
    29.
    发明授权
    Multi-reactor slurry polymerization processes with high ethylene purity 有权

    公开(公告)号：US10047176B2

    公开(公告)日：2018-08-14

    申请号：US15503299

    申请日：2015-08-13

    Applicant: Basell Polyolefine GmbH

    Inventor： Gerhardus Meier ,  Elke Damm ,  Reinhard Kuehl ,  Rodrigo Carvajal ,  Phil Pyman

    IPC: C08F110/02 ,  C08F2/14 ,  C07C7/13 ,  C07C11/04

    Abstract: A slurry polymerization process for the preparation of polyethylene in a reactor cascade of two or more polymerization reactors including the steps of feeding to a polymerization reactor amounts of ethylene, of a Ziegler catalyst, of fresh aluminum alkyl and of a diluent; feeding the slurry product withdrawn from the polymerization reactor to a second polymerization reactor; and feeding additional amounts of ethylene and of diluent wherein the ethylene is first passed through an ethylene purification unit, which reduces at least the concentration of carbon monoxide, carbon dioxide, oxygen, acetylene and water contained in the ethylene, before it is fed to the two or more polymerization reactors of the reactor cascade.

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