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公开(公告)号：US20220380498A1
公开(公告)日：2022-12-01
申请号：US17774967
申请日：2020-12-07
Applicant: Borealis AG
Inventor： Mohammad Al-haj Ali , Michiel Bergstra , Erik Eriksson , Sameer Vijay , Christof Wumitsch , Samuli Zitting , Henry Sleijster , Noureddine Ajellal
IPC: C08F210/16 , C08F4/659
Abstract: The present invention relates to a polymerization process, comprising: a) supplying a feed containing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms in a hydrocarbon solvent to a polymerization reactor, b) contacting the feed of step a) in the reactor with a catalyst to form a reaction mixture containing an ethylene-alpha-olefin co-polymer, c) withdrawing the reaction mixture from the polymerization reactor as a reactor outlet stream which comprises the ethylene-alpha-olefin co-polymer, unreacted monomer and comonomer, catalyst, and hydrocarbon solvent, d) heating the reactor outlet stream to a temperature which is at least 5° C. higher than the temperature of the reaction mixture at the outlet of the reactor for a time period of between 1 and 250 seconds in order to de-activate the polymerization catalyst, and e) separating hydrocarbon solvent, monomer and comonomer from the reactor outlet stream and recycling it back to the polymerization reactor without further purification steps.
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公开(公告)号：US10604595B2
公开(公告)日：2020-03-31
申请号：US15776089
申请日：2016-12-21
Applicant: Borealis AG
Inventor： Mohammad Al-Haj Ali , Erik Eriksson , Sameer Vijay , Guhan Mathivanan , Jukka Rasanen , Henry Sleijster , Christof Wurnitsch , Samuli Zitting
Abstract: A process for withdrawing polyolefins from a reactor includes: continuously withdrawing a liquid solution stream from a solution polymerization reactor and passing the liquid solution stream into a low pressure separator; withdrawing a first vapour stream and a first liquid stream from the separator and passing the first vapour stream into a washing column; withdrawing a second vapour stream from the washing column and feeding it via a condenser line to a condenser; cooling the second vapour stream in the condenser so that part of the second vapour stream condenses, producing a condensed second vapour stream and an uncondensed second vapour stream; passing the condensed second vapour stream to an upper part of the washing column via a reflux line; withdrawing a second liquid stream from the washing column and passing at least part of the second liquid stream to the separator via a recycling line; and recovering heat.
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公开(公告)号：US20190126511A1
公开(公告)日：2019-05-02
申请号：US16093779
申请日：2017-05-09
Applicant: Borealis AG
Inventor： Jukka Räsänen , Samuli Zitting , Henry Sleijster , Michiel Bergstra , Sameer Vijay
Abstract: Process for hydraulic conveying of polyolefin pellets comprising the steps of: (i) extruding molten polyolefin into strands and cutting the strands into pellets in an underwater pelletiser (A); (ii) withdrawing a first pellet suspension stream (1.1) from the pelletiser; (iii) concentrating the first pellet suspension stream in a first pellet separator (B); (iv) passing the concentrated pellet stream (1.4) to a hydraulic conveying line through a first vessel (D) and mixing it with water thereby producing a second pellet suspension stream (1.5); (v) withdrawing the second pellet suspension stream from the first vessel and passing it to a second pellet separator (E); (vi) separating the pellets from water in the second pellet separator thereby creating a second water stream (1.6) and a dry pellet stream (1.10) and passing the second water stream back to the first vessel; wherein any one of the first or second pellet suspension stream or the dry pellet stream comprises an antiblock.
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公开(公告)号：US20180327529A1
公开(公告)日：2018-11-15
申请号：US15776095
申请日：2016-12-21
Applicant: Borealis AG
Inventor： Henry Sleijster , Mohammad Al-Haj Ali , Jukka Rasanen , Samuli Zitting , Michiel Bergstra , Erik Eriksson , Christof Wurnitsch , Guhan Mathivanan , Sameer Vijay , Vasileios Kanellopoulos , Jani Aho , Jouni Takakarhu
IPC: C08F210/14 , C08F210/02 , C08J11/02
Abstract: An in-line blending process for polymers comprising: (a) providing two or more reactor-low pressure separator units (1,7) in parallel configuration, each reactor-low pressure separator unit comprising one reactor (2,8) fluidly connected to one low pressure separator (3,9) downstream and further a recycling line (5,11) connecting the low pressure separator (3,9) back to the corresponding reactor (2,8); (b) polymerizing olefm monomers having two or more carbon atoms in each of the reactors (2,8) in soltion polymerisation; (c) forming an unreduced reactor effluents stream including a homogenous fluid phase polymer-monomer-solvent mixture in each of the reactors (2,8), (d) passing the unreduced reactor effluents streams from each of the reactors (2,8) through the corresponding low pressure separators (3,9), whereby the temperature and pressure of the low pressure separators (3,9) is adjusted such that a liquid phase and a vapour phase are obtained, whereby yielding a polymer-enriched liquid phase and a polymer-lean vapour phase, and (e) separating the polymer-lean vapour phase from the polymer-enriched liquid phase in each of the low-pressure separators (3,9) to form separated polymer-lean vapour streams and separated polymer-enriched liquid streams; (f) combining the polymer-enriched liquid streams from step (e) in a further low-pressure separator and/or a mixer (13) to produce a combined polymer-enriched liquid stream (16); (g) reintroducing the polymer-lean vapour streams from step (e) via recycling lines (5,11) into the corresponding reactors (2,8).
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