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    Process for preparation of multimodal polyolefin
    1.
    发明授权
    Process for preparation of multimodal polyolefin 有权

    公开(公告)号：US12091475B2

    公开(公告)日：2024-09-17

    申请号：US17284605

    申请日：2019-09-12

    Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

    Inventor： Maryam Tamaddoni ,  Job Daniel Guzman-Carrazco ,  Maryam Khodadadian Miri ,  Francesco Bertola ,  Andrei Merenov

    IPC: C08F210/16 ,  C08F2/00 ,  C08F2/01 ,  C08F2/14 ,  C08F4/655

    CPC classification number: C08F2/001 ,  C08F2/01 ,  C08F2/14 ,  C08F4/6555 ,  C08F210/16 ,  C08F2500/05 ,  C08F2500/07 ,  C08F2500/12

    Abstract: The invention relates to a process for the preparation of a multimodal copolymer of ethylene and a comonomer which is 1-hexene and/or 1-butene in a series of polymerization reactors comprising at least a first polymerization reactor and a second polymerization reactor, the process comprising: a) feeding ethylene, hydrogen and catalyst components (1) and a first diluent (29) to the first polymerization reactor (A) to prepare a first suspension (3) of solid particles of a first ethylene polymer in a first suspension medium, wherein the first diluent (29) comprises branched heptane and is essentially free of the comonomer: b) feeding the first suspension (3) to a flash drum (E) for vaporizing a part of the first suspension medium to obtain a hydrogen-depleted suspension (4), c) feeding the hydrogen-depleted suspension (4), ethylene and comonomer (9) and a second diluent (24 & 34) to the second polymerization reactor (H) to prepare a second suspension (11) of solid particles of a second ethylene polymer in a second suspension medium, wherein the second diluent (24 & 34) comprises branched heptane and the comonomer dissolved in the second diluent, d) processing the second suspension (11) to obtain a dry effluent (15) of the solid particles of the second ethylene polymer and a liquid stream (23) comprising branched heptane, the comonomer, and low molecular weight hydrocarbon reaction products, e) feeding at least part (25) of the liquid stream (23) to an evaporation system (Q) for separating non-volatile, low-molecular-weight hydrocarbon reaction products and subsequently to a distillation column (R) for separating the comonomer from branched heptane to obtain 1) a branched heptane liquid stream (29) essentially free of the comonomer. 2) a vapor distillate (31) comprising the comonomer and branched heptane and 3) a liquid distillate (30) comprising branched heptane and the comonomer, f) feeding the liquid distillate stream (30) to the second polymerization reactor (B) to form at least part of the second diluent (34) and g) feeding the branched heptane liquid stream (29) to the first polymerization reactor as the first diluent.

    PROCESS FOR PREPARATION OF MULTIMODAL POLYOLEFIN
    3.
    发明申请
    PROCESS FOR PREPARATION OF MULTIMODAL POLYOLEFIN 有权

    公开(公告)号：US20210388122A1

    公开(公告)日：2021-12-16

    申请号：US17284605

    申请日：2019-09-12

    Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

    Inventor： Maryam Tamaddoni ,  Job Daniel Guzman-Carrazco ,  Maryam Khodadadian Miri ,  Francesco Bertola ,  Andrei Merenov

    IPC: C08F2/00 ,  C08F210/16 ,  C08F2/01 ,  C08F2/14 ,  C08F4/655

    Abstract: The invention relates to a process for the preparation of a multimodal copolymer of ethylene and a comonomer which is 1-hexene and/or 1-butene in a series of polymerization reactors comprising at least a first polymerization reactor and a second polymerization reactor, the process comprising: a) feeding ethylene, hydrogen and catalyst components (1) and a first diluent (29) to the first polymerization reactor (A) to prepare a first suspension (3) of solid particles of a first ethylene polymer in a first suspension medium, wherein the first diluent (29) comprises branched heptane and is essentially free of the comonomer; b) feeding the first suspension (3) to a flash drum (E) for vaporizing a part of the first suspension medium to obtain a hydrogen-depleted suspension (4), c) feeding the hydrogen-depleted suspension (4), ethylene and comonomer (9) and a second diluent (24 & 34) to the second polymerization reactor (H) to prepare a second suspension (11) of solid particles of a second ethylene polymer in a second suspension medium, wherein the second diluent (24 & 34) comprises branched heptane and the comonomer dissolved in the second diluent, d) processing the second suspension (11) to obtain a dry effluent (15) of the solid particles of the second ethylene polymer and a liquid stream (23) comprising branched heptane, the comonomer, and low molecular weight hydrocarbon reaction products, e) feeding at least part (25) of the liquid stream (23) to an evaporation system (Q) for separating non-volatile, low-molecular-weight hydrocarbon reaction products and subsequently to a distillation column (R) for separating the comonomer from branched heptane to obtain 1) a branched heptane liquid stream (29) essentially free of the comonomer, 2) a vapor distillate (31) comprising the comonomer and branched heptane and 3) a liquid distillate (30) comprising branched heptane and the comonomer, f) feeding the liquid distillate stream (30) to the second polymerization reactor (B) to form at least part of the second diluent (34) and g) feeding the branched heptane liquid stream (29) to the first polymerization reactor as the first diluent.

    Process for preparation of multimodal polyolefin
    5.
    发明授权
    Process for preparation of multimodal polyolefin 有权

    公开(公告)号：US11597783B2

    公开(公告)日：2023-03-07

    申请号：US17058184

    申请日：2019-05-14

    Applicant: SABIC GLOBAL TECHNOLOGIES B.V.

    Inventor： Job Daniel Guzman-Carrazco ,  Peter Groefsema ,  Maryam Tammadoni ,  Victor Mattheij

    IPC: C08F10/02 ,  C08F2/00 ,  C08F2/01 ,  C08F2/18 ,  C08F10/06 ,  C08F10/14 ,  B01D1/30

    Abstract: The invention relates to a process for the preparation of a multimodal polyolefin polymer in a first polymerization reactor and a second polymerization reactor connected in series, wherein a first polyolefin polymer is prepared in the first polymerization reactor in suspension in the presence of hydrogen and a second polyolefin polymer is prepared in the second polymerization reactor in the presence of a lower concentration of hydrogen than in the first polymerization reactor, the process comprising: a) withdrawing a suspension of solid polyolefin particles in a suspension medium from the first polymerization reactor, wherein the suspension medium comprises hydrogen and a hydrocarbon mixture having an initial boiling point of at least 50° C. and a final boiling point of at most 120° C.; b) feeding the suspension to a flash drum having a pressure controlled by a vacuum pump, wherein the pressure of the flash drum is less than 0.1 MPa; c) vaporizing a part of the suspension medium in the flash drum to obtain a hydrogen-depleted suspension and d) withdrawing the hydrogen-depleted suspension from the flash drum and feeding it to the second polymerization reactor.

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