Title:
マルチモーダルポリエチレン重合用の反応器システム
Document Type and Number:
Japanese Patent JP7092718
Kind Code:
B2
Abstract:
The present invention relates to a process for producing a multimodal polyethylene composition in the reactor system according to the invention, comprising;(a) polymerizing ethylene in an inert hydrocarbon medium in the first reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen in an amount of 0.1-95% by mol with respect to the total gas present in the vapor phase in the first reactor to obtain a low molecular weight polyethylene or a medium molecular weight polyethylene;(b) removing in the hydrogen removal unit 98.0 to 99.8% by weight of the hydrogen comprised in a slurry mixture obtained from the first reactor at a pressure in the range of 103-145 kPa (abs) and transferring the obtained residual mixture to the second reactor;(c) polymerizing ethylene and optionally Cto Cα-olefin comonomer in the second reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and in the presence of hydrogen in an amount obtained in step (b) to obtain a first high molecular weight polyethylene or a first ultra high molecular weight polyethylene in the form of a homopolymer or a copolymer and transferring a resultant mixture to the third reactor; and(d) polymerizing ethylene, and optionally α-olefin comonomer in the third reactor in the presence of a catalyst system, selected from Ziegler-Natta catalyst or metallocene, and hydrogen, wherein the amount of hydrogen in the third reactor is in a range of 1-70% by mol, preferably 1-60% by mol with respect to the total gas present in the vapor phase in the third reactor or optionally substantial absence of hydrogen to obtain a second high molecular weight polyethylene or a second ultra high molecular weight polyethylene homopolymer or copolymer;and a multimodal polyethylene composition obtainable this way.
Inventors:
Tiyapi Boon Chaiya, Piyawan
Samfawa Montri, Patcharin
Chromkamol, Warachad
Samfawa Montri, Patcharin
Chromkamol, Warachad
Application Number:
JP2019147671A
Publication Date:
June 28, 2022
Filing Date:
August 09, 2019
Export Citation:
Assignee:
Thai Polyethylene Company Limited
SCG Chemicals Company, Limited
SCG Chemicals Company, Limited
International Classes:
C08F2/01; C08F2/00; C08F10/02; C08L23/06
Domestic Patent References:
| JP2009508975A |
Foreign References:
| WO2008049551A1 | ||||
| WO2018046604A1 |
Attorney, Agent or Firm:
Hiroshi Kobayashi
Norio Omori
Iguchi Tsukasa
Norio Omori
Iguchi Tsukasa