[특허]Multi-stage process for producing polyethylene

Multi-stage process for producing polyethylene 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-002/06
출원번호	US-0920569 (1992-08-20)
우선권정보	FI-0006428 (1990-12-28)
국제출원번호	PCT/FI91/00406 (1991-12-20)
§371/§102 date	19920820 (19920820)
국제공개번호	WO-9212182 (1992-07-23)
발명자 / 주소	Ahvenainen Antero (Porvoo FIX) Sarantila Kari (Porvoo FIX) Andtsj Henrik (Porvoo FIX) Takakarhu Jouni (Helsinki FIX) Palmroos Ari (Kerava FIX)
출원인 / 주소	Neste OY (FIX 03)
인용정보	피인용 횟수 : 63 인용 특허 : 0

초록 ▼

The invention concerns a multi-stage process for producing polyethylene having a bimodal and/or broad molecular weight distribution in the presence of an ethylene polymerizing catalyst system in a multistep reaction sequence, in which the first reaction step is a liquid phase polymerization step and the second reaction step is formed by one or more gas-phase polymerization steps. According to the process of the invention in the first reaction step ethylene is polymerized in a loop reactor (10) in an inert low-boiling hydrocarbon medium the residence time being at least 10 minutes, reaction mixture is discharged from the loop reactor (10) and at least a substantial part of the inert hydrocarbon mixture is separated and the polymer is transferred into one or more gas-phase reactors (30), where the polymerization is completed in the presence of ethylene and optionally hydrogen and a comonomer. As an inert hydrocarbon medium in the loop reactor (10) propane can be used and the polymerization can be carried out also so that the mixture of inert hydrocarbon, monomer, hydrogen and optional comonomer is under supercritical conditions.

대표청구항 ▼

A multi-stage process for producing polyethylene having a bimodal and/or broad molecular weight distribution in a multi-step reaction sequence, in which the first stage is a liquid phase polymerization step and the second step comprises one or more gas phase polymerization steps, said process comprising polymerizing ethylene in the first step in the presence of an ethylene polymerizing catalyst system, hydrogen and optional comonomer in a loop reactor in an inert low boiling hydrocarbon medium during a residence time which is at least 10 minutes and which is sufficiently long to produce polyethylene in an amount of 20-90% based on the total polymer produced in the process, discharging the resulting reaction mixture from the loop reactor, removing hydrogen, unreacted reactants, and the inert hydrocarbon medium from said reaction mixture, transferring the produced polymer from which hydrogen, unreacted reactants and the hydrocarbon medium has been removed into one or more gas phase reactors, and completing the polymerization in the gas phase reactor in the presence of ethylene and optionally hydrogen and comonomer to produce polyethylene having bimodal and/or broad molecular weight distribution.

이 특허를 인용한 특허 (63)

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Kendrick,James Austin; Towles,Thomas W.; Roger,Scott Thomas, Continuous slurry polymerization process and apparatus.
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Kendrick, James Austin; Towles, Thomas W.; Roger, Scott Thomas, Continuous slurry polymerization process and appparatus.
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Kendrick,James Austin, Continuous slurry polymerization volatile removal.
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McElvain, Robert R.; Hottovy, John D.; Romig, Ralph W.; Verser, Donald W.; Burns, David H.; Tait, John H.; Peacock, Richard; Hein, James E.; Kufeld, Scott E.; Fenderson, Carl W.; Gupta, Anurag; Zellers, Dale A., Energy efficient polyolefin process.
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McElvain, Robert R.; Hottovy, John D.; Romig, Ralph W.; Verser, Donald W.; Burns, David H.; Tait, John H.; Peacock, Richard; Hein, James E.; Kufeld, Scott E.; Fenderson, Carl W.; Gupta, Anurag; Zellers, Dale A.; Zellers, legal representative, Penny A., Energy efficient polyolefin process.
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McElvain, Robert R.; Hottovy, John D.; Romig, Ralph W.; Verser, Donald W.; Burns, David H.; Tait, John H.; Peacock, Richard; Hein, James E.; Kufeld, Scott E.; Fenderson, Carl W.; Gupta, Anurag; Zellers, Dale A.; Zellers, legal representative, Penny A., Energy efficient polyolefin process.
상세보기
McElvain, Robert R.; Hottovy, John D.; Romig, Ralph W.; Verser, Donald W.; Burns, David H.; Tait, John H.; Peacock, Richard; Hein, James E.; Kufeld, Scott E.; Fenderson, Carl W.; Gupta, Anurag; Zellers, Dale A.; Zellers, legal representative, Penny A., Energy efficient polyolefin process.
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Kufeld, Scott E; Hottovy, John D, Flow in a slurry loop reactor.
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Keller George Ernest ; Carmichael Keith Ernest ; Cropley Jean Bowman ; Larsen Eldon Ronald ; Ramamurthy Arakalud Venkatapathia ; Smale Mark Wilton ; Wenzel Timothy Todd ; Williams Clark Curtis, Gas phase polymerization employing unsupported catalysts.
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St. Jean, Guylaine; Lanier, Elizabeth M.; Lanier, J. Todd; Yang, Qing; Gill, Brooke A., High clarity low haze compositions.
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Franklin, III, Robert K.; Hottovy, John D.; Hensley, Harvey D.; Przelomski, David J.; Cymbaluk, Teddy H.; Perez, Ethelwoldo P., High polymer solids slurry polymerization employing 1-olefin comonomer.
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Hottovy, John D.; Hensley, Harvey D.; Przelomski, David J.; Cymbaluk, Teddy H.; Franklin, III, Robert K.; Perez, Ethelwoldo P., High solids slurry polymerization using heat exchange to condense the flashed diluent.
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Kiss, Gabor; Galuska, Alan Anthony, In-line process to produce pellet-stable polyolefins.
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Mehta, Aspy K.; Varma-Nair, Manika; Kiss, Gabor; Brant, Patrick; Reynolds, Robert P.; Chu, John W.; Rucker, Steven P.; Jiang, Peijun, Isotactic polypropylene produced from supercritical polymerization process.
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Kivelä, Jouni; Nyfors, Klaus, Method and apparatus for discharging polymerization reactors.
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Kivelä, Jouni; Nyfors, Klaus, Method and apparatus for discharging polymerization reactors.
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Koike, Tatsuya, Method for producing an olefin homopolymer or an olefin copolymer.
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Eaton, Gerald B.; Monahan, Michael J.; Tipton, Robert J., Methods for forming amorphous ultra-high molecular weight polyolefins and drag reducing compositions comprising amorphous ultra-high molecular weight polyolefins.
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Eaton, Gerald B.; Monahan, Michael J.; Ebert, Alan K.; Tipton, Robert J.; Baralt, Eduardo, Methods for forming amorphous ultra-high molecular weight polyolefins for use as drag reducing agents.
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Tait, John H.; Murphy, Robert S.; Watts, Michael A.; Gupta, Anurag, Monomer recovery by returning column overhead liquid to the reactor.
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Cribbs Leonard V. ; Etherton Bradley P. ; Mack Mark P. ; Meas ; Jr. James H., Olefin polymerization process.
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Kenneth Alan Dooley ; Randal Ray Ford ; Glenn Edward Moore ; Brad Thedford Duckworth ; Don Kent Farrer, Olefin polymerization process.
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Friedersdorf, Chris B.; Brant, Patrick; Kiss, Gabor, Phase separator and monomer recycle for supercritical polymerization process.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Multi-stage process for producing polyethylene 원문보기

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Multi-stage process for producing polyethylene 원문보기

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