EP1159303A1 - Procede d'elimination de l'electricite statique - Google Patents

Procede d'elimination de l'electricite statique

Info

Publication number
EP1159303A1
EP1159303A1 EP99971430A EP99971430A EP1159303A1 EP 1159303 A1 EP1159303 A1 EP 1159303A1 EP 99971430 A EP99971430 A EP 99971430A EP 99971430 A EP99971430 A EP 99971430A EP 1159303 A1 EP1159303 A1 EP 1159303A1
Authority
EP
European Patent Office
Prior art keywords
powder
flow
charge
added
static electricity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99971430A
Other languages
German (de)
English (en)
Inventor
Jorma Di Tuomainen
Seppo Ali-Hokka
Klaus Nyfors
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Borealis Technology Oy
Original Assignee
Borealis Technology Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Borealis Technology Oy filed Critical Borealis Technology Oy
Publication of EP1159303A1 publication Critical patent/EP1159303A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1872—Details of the fluidised bed reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00734—Controlling static charge

Definitions

  • the present invention relates to the conveyance of polymer powders. More particularly, the invention concerns the elimination of static electricity formed during the conveyance.
  • the invention can be used especially in multistage polymerization processes.
  • WO 96/18662 describes a multistage process for preparing polyethylene. Ethylene is first polymerized in liquid phase in loop reactors and then in a gas phase reactor. After the loop reactors gases and liquids are removed from the reaction mixture in a flash stage and only the solid polymer powder is conveyed into the gas phase reactor.
  • Static electricity is a known problem also in fluidized bed reactors. This causes for example sheeting during the polymerization of alpha-olefins.
  • US 4 803 251 describes a method for reducing such sheeting by adding a charge generating chemical directly into the reactor.
  • the chemical is an alcohol containing up to 7 carbon atoms, oxygen or nitric oxide, if negative static charge is indicated, or a ketone containing up to 7 carbon atoms, if positive static charge is indicated.
  • an antistatic chemical is added into the flow of the polymer powder.
  • different chemicals may be added. If the charge is positive, a negative charge generating chemical is added, and if the charge is negative, a positive charge genetrating chemical is added.
  • the antistatic chemical especially improves the flow properties of the powder.
  • the invention can be used for example in multistage polymerizing processes, when polymer powder has to be conveyed from one process stage to another.
  • Figure 1 is a schematic representation of a part of a multistage polymerization process.
  • Figure 2 is a schematic representation of the feeding system of polymer powder into the gas phase reactor of the process.
  • the invention relates to processes in which polymer powder is conveyed especially pneumatically through a pipeline system, typically from one vessel to another.
  • the first vessel may be for example a separator, and the second vesssel a reactor.
  • the pipeline system comprises a conduit and possibly also additional vessels for storing and feeding the polymer powder.
  • a pneumatic system is provided with suitable means for feeding carrier gas into into the pipeline.
  • the carrier gas is preferably inert.
  • the carrier gas may be separated from the powder before the second vessel. In this case the powder is fed into the second vessel by separate means, such as by gravity flow or by suitable conveying means.
  • the carrier gas is usually recycled.
  • the polymer may be especially polyalkylene, such as polyethylene or polypropylene.
  • Antistatic chemical is fed into the pipeline system in order to eliminate the formation of static electricity during the conveyance.
  • the charge of the powder is measured in the second vessel or in the pipeline equipment and the feed of the chemical is controlled based on the measurement.
  • the chemical is water, or ketone, if the charge is positive, and an alcohol, oxygen or nitric oxide, if the charge is negative.
  • the alcohol contains preferably 1 to 10 carbon atoms.
  • the chemical is preferably fed into the pipeline equipment in the first possible connection.
  • the amount of the antistatic chemical may be, for example, 0.1-100, preferably 1- 10, and most preferably 2-5, moles per ton of the powder.
  • reaction mixture 1 from a first polymerization stage is fed into a flash separator 2.
  • the mixture contains polymer and gases in a liquid medium comprising low boiling hydrocarbons.
  • the hydrocarbons are evaporated and the polymer is recovered as a solid powder.
  • the evaporated hydrocarbons are returned into the firststage.
  • the polymer powder obtained from the separator also contains the solid catalyst from the first polymerization stage.
  • the first stage process is preferably such as described in WO 96/18662 and comprises two successive loop reactors for carrying out a liquid polymerization.
  • the polymer powder is pneumatically conveyed via a conduit 3 into a first feed tank 4.
  • the nitrogen used to convey the polymer powder is dilivered by a compressor 5.
  • nitrogen is separated from the powder and returned to the compressor.
  • the powder from the first feed tank is led by gravity flow into a second feed tank 6, from which it is fed pneumatically into a gas phase reactor 7.
  • valves 13, 14 and 15 are closed.
  • the valves isolate a section 16 from the rest of the piping.
  • valve 13 is opened, powder falls into section 16.
  • valve 14 is closed.
  • section 16 is pressurised with nitrogen to a pressure which is higher than that in the reactor.
  • valve 14 is closed.
  • valve 15 is opened, and the high pressure in section 16 causes its contents to be discharged via the conduit into the reactor.
  • the lower part of reactor 7 contains a bed of polymer particles.
  • the bed is kept in a fluidized state by a gas flow moving upwards in the reactor.
  • the unreacted gas is collected from the top of the reactor and pressurised using a compressor.
  • the pressurised gas is then recycled into the bottom part of the reactor thus establishing the upwardly moving gas flow.
  • Monomer and other possible components such as comonomers and hydrogen can be fed into the lower part of the reactor.
  • the product is removed from the reactor into a product tank 8.
  • the pipeline system is earth connected 9 in order to reduce static electricity.
  • the formation of the static electricity depends on the nature of the polymer, reaction conditions, conveying conditions, catalyst, and on the materials of the conveying system. In most cases the charge is positive, but especially certain impurities in the polymerization gases cause negative charges.
  • Reactor 7 is provided with one or several charge indicators 10 in order to measure the possible static charge of the polymer powder.
  • antistatic chemical is added by dosing equipment 11 into the nitrogen flow after the compressor 4.
  • the amount of the chemical is controlled through a line 12 in accordance with the level of the measured charge.
  • the antistatic chemical is water, if the measured charge is positive, and propanol, if the charge is negative.
  • the typical capacity was such that the production rate in the first stage was 6 tons per hour.
  • the nitrogen feed was 1.2 tons per hour.
  • the dose of the antistatic chemical needed to eliminate the static electricity was on an average 20 moles per hour (about 3.3 mol per ton of the powder).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Polymerisation Methods In General (AREA)

Abstract

Cette invention se rapporte à un procédé servant à éliminer l'électricité statique qui se forme lorsqu'une poudre polymère est transportée sous forme d'écoulement le long d'un système de conduites. Selon cette invention, un agent chimique antistatique est ajouté dans l'écoulement. Cet agent chimique antistatique améliore particulièrement les propriétés d'écoulement de la poudre.
EP99971430A 1998-11-04 1999-11-04 Procede d'elimination de l'electricite statique Withdrawn EP1159303A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI982388 1998-11-04
FI982388A FI982388A (fi) 1998-11-04 1998-11-04 Menetelmä staattisen sähkön eliminoimiseksi
PCT/FI1999/000919 WO2000026258A1 (fr) 1998-11-04 1999-11-04 Procede d'elimination de l'electricite statique

Publications (1)

Publication Number Publication Date
EP1159303A1 true EP1159303A1 (fr) 2001-12-05

Family

ID=8552841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99971430A Withdrawn EP1159303A1 (fr) 1998-11-04 1999-11-04 Procede d'elimination de l'electricite statique

Country Status (4)

Country Link
EP (1) EP1159303A1 (fr)
AU (1) AU1163700A (fr)
FI (1) FI982388A (fr)
WO (1) WO2000026258A1 (fr)

Families Citing this family (71)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090356A1 (fr) 2007-12-24 2009-08-19 Borealis Technology OY Systèmes réacteurs et procédé pour la polymérisation catalytique d'oléfines et l'utilisation d'un tel système réacteur dans la polymérisation catalytique d'oléfines
EP2082797A1 (fr) 2007-12-24 2009-07-29 Borealis Technology OY Système réacteur pour la polymérisation catalytique d'oléfines comprenant un moyen de blindage et un procédé et utilisation correspondante
ES2666896T3 (es) 2007-12-24 2018-05-08 Borealis Technology Oy Sistema reactor y proceso para la polimerización catalítica de olefinas y el uso de tal sistema reactor en la polimerización catalítica de olefinas
EP2130859A1 (fr) 2008-06-02 2009-12-09 Borealis AG Compositions polymères disposant d'une homogénéité et odeur améliorées, leur procédé de fabrication et tuyaux fabriqués à partir de ces compositions
EP2130863A1 (fr) 2008-06-02 2009-12-09 Borealis AG Compositions polymères haute densité, leur procédé de préparation et tuyaux résistants à la pression fabriqués à partir de ces compositions
EP2130862A1 (fr) 2008-06-02 2009-12-09 Borealis AG Compositions polymères et tuyaux résistant à la pression fabriqués à partir de ces compositions
EP2182524A1 (fr) 2008-10-31 2010-05-05 Borealis AG Câble et composition de copolymère éthylénique multimodal
EP2182525A1 (fr) 2008-10-31 2010-05-05 Borealis AG Câble et composition de copolymère éthylénique multimodal
EP2182526A1 (fr) 2008-10-31 2010-05-05 Borealis AG Câble et composition de copolymère éthylénique multimodal
EP2223943B1 (fr) 2009-02-25 2011-10-19 Borealis AG Polymère de propylène multimodal, composition le contenant et son procédé de fabrication
EP2223944A1 (fr) 2009-02-26 2010-09-01 Borealis AG Procédé de fabrication de polymères de propylène semicristallin
PL2256158T3 (pl) 2009-05-26 2014-09-30 Borealis Ag Kompozycja polimerowa do usieciowanych wyrobów
EP2256159A1 (fr) 2009-05-26 2010-12-01 Borealis AG Composition de polymère pour tuyaux réticulés
WO2011058088A1 (fr) 2009-11-13 2011-05-19 Borealis Ag Procédé pour la récupération d'un composé de métal de transition
WO2011058089A1 (fr) 2009-11-13 2011-05-19 Borealis Ag Procédé de production d'un catalyseur de polymérisation
EP2322568B1 (fr) 2009-11-13 2013-05-15 Borealis AG Procédé pour la production d'un catalyseur de polymérisation d'oléfine
EP2397221B1 (fr) 2010-06-17 2017-04-12 Borealis AG Système de contrôle pour réacteur à phase gazeuse, réacteur à phase gazeuse pour la production catalytique de polyoléfines, procédé de production catalytique de polyoléfines et utilisation du système de contrôle
EP2452960B1 (fr) 2010-11-12 2015-01-07 Borealis AG Procédé pour la préparation de polymères de propylène avec un taux de fluidité ultra élevé
EP2452976A1 (fr) 2010-11-12 2012-05-16 Borealis AG Copolymères de propylène hétérophasique dotés d'un équilibre amélioré entre rigidité, impact et fluidité
EP2452959B1 (fr) 2010-11-12 2015-01-21 Borealis AG Procédé pour la production de copolymères aléatoires de propylène et leurs utilisations
EP2452957A1 (fr) 2010-11-12 2012-05-16 Borealis AG Procédé amélioré pour la production de copolymères de propylène hétérophasiques
EP2594333B1 (fr) 2011-11-21 2014-07-30 Borealis AG Procédé de récupération de polymère et appareil associé
EP2617741B1 (fr) 2012-01-18 2016-01-13 Borealis AG Procédé de polymérisation de polymères d'oléfine en présence d'un système de catalyseur et procédé de contrôle du procédé
EP2703445B1 (fr) 2012-08-31 2017-05-17 Borealis AG Gaine conductrice
EP2746300B1 (fr) 2012-12-21 2016-12-07 Borealis AG Procédé de production d'un procatalyseur ziegler-natta pour la polymérisation d'éthylène
EP2746306B1 (fr) 2012-12-21 2017-10-04 Borealis AG Procatalyseur de Ziegler-Natta supporté pour la polymérisation d'éthylène
EP2745926A1 (fr) 2012-12-21 2014-06-25 Borealis AG Polymérisation en phase gazeuse et ensemble de réacteur comprenant un réacteur à lit fluidisé et un réacteur à lit mobile externe
EP2745927A1 (fr) 2012-12-21 2014-06-25 Borealis AG Réacteur à lit fluidisé avec unité de réaction à lit mobile interne
EP2860203B1 (fr) 2013-10-10 2016-12-14 Borealis AG Procédé en plusieurs étapes de production de compositions de polyéthylène
EP2883887A1 (fr) 2013-12-13 2015-06-17 Borealis AG Procédé en plusieurs étapes de production de compositions de polyéthylène
EP2883885A1 (fr) 2013-12-13 2015-06-17 Borealis AG Procédé en plusieurs étapes de production de compositions de polyéthylène
US10385194B2 (en) 2014-11-26 2019-08-20 Borealis Ag Polyethylene composition for a film layer
US10494465B2 (en) 2014-11-26 2019-12-03 Borealis Ag Film layer
CN106715067A (zh) 2014-12-08 2017-05-24 博里利斯股份公司 丙烯共聚物粒料的制备方法
CN107207662B (zh) 2015-02-05 2021-04-09 博里利斯股份公司 用于生产聚乙烯的方法
EP3053976A1 (fr) 2015-02-09 2016-08-10 Borealis AG Composition adhésive
EP3298067B1 (fr) 2015-05-20 2019-07-17 Borealis AG Procédé de production de compositions de polyéthylène
EP3109261B1 (fr) 2015-06-23 2018-12-26 Borealis AG Procede de production de resines lldpe
EP3238938A1 (fr) 2016-04-29 2017-11-01 Borealis AG Film orienté dans le sens machine comprenant un copolymère d'éthylène multimodal et au moins deux comonomères d'alpha-oléfines
EP3252085B1 (fr) 2016-05-31 2022-11-09 Borealis AG Gaine ayant des propriétés améliorées
CN109415544B (zh) 2016-05-31 2022-07-05 博里利斯股份公司 聚合物组合物以及用于生产该聚合物组合物的方法
EP3472239B1 (fr) 2016-06-17 2020-05-13 Borealis AG Polyéthylène bi- ou multimodal à faible niveau d'insaturation
US20190338111A1 (en) 2016-06-17 2019-11-07 Borealis Ag Bi- or multimodal polyethylene with enhanced rheological properties
EP3257879A1 (fr) 2016-06-17 2017-12-20 Borealis AG Polyéthylène bi- ou multimodal à faible niveau d'insaturation
EP3472240B1 (fr) 2016-06-17 2020-04-01 Borealis AG Terpolymère de polyéthylène multimodal bi- ou avec des propriétés rhéologiques améliorées
EP3257895A1 (fr) 2016-06-17 2017-12-20 Borealis AG Terpolymère de polyéthylène bi ou multimodal avec des propriétés rhéologiques améliorées
CN109415448B (zh) 2016-06-22 2021-04-13 北欧化工公司 聚合物组合物以及制备聚合物组合物的方法
KR102301007B1 (ko) 2016-06-23 2021-09-10 보레알리스 아게 촉매 비활성화 방법
CN109923168B (zh) 2016-11-25 2023-01-24 博里利斯股份公司 组合物和方法
EP3418330B2 (fr) 2017-06-21 2023-07-19 Borealis AG Composition polymère et procédé de production associé
WO2019081611A1 (fr) 2017-10-24 2019-05-02 Borealis Ag Film polymère multicouche
EP3746492B1 (fr) 2018-01-30 2022-10-26 Borealis AG Agent de couplage
WO2019166652A1 (fr) 2018-03-02 2019-09-06 Borealis Ag Procédé
WO2019180166A1 (fr) 2018-03-21 2019-09-26 Borealis Ag Composition de polyéthylène bimodal ou multimodal
EP3823999A1 (fr) 2018-07-19 2021-05-26 Borealis AG Procédé pour la préparation d'un homopolymère uhmwpe
ES2929211T3 (es) 2018-11-07 2022-11-25 Borealis Ag Composición de poliolefina con resistencia mejorada al impacto y al blanqueamiento
SG11202102319WA (en) 2018-11-15 2021-04-29 Abu Dhabi Polymers Co Ltd Borouge Polymer composition for blow molding applications
WO2020109563A1 (fr) 2018-11-29 2020-06-04 Borealis Ag Procédé de production d'un polymère et polymère
WO2021045889A1 (fr) 2019-09-05 2021-03-11 Exxonmobil Chemical Patents Inc. Procédés de production de polyoléfines et de copolymères résistant aux chocs ayant une large distribution de poids moléculaire et une rigidité élevée
EP3835327B1 (fr) 2019-12-09 2024-07-31 Borealis AG Système de production de polyoléfine et procédé de récupération de produit de polymérisation à partir d'un réacteur en phase gazeuse
WO2021150377A1 (fr) 2020-01-24 2021-07-29 Exxonmobil Chemical Patents Inc. Procédés de fabrication de polyoléfines bimodales et de copolymères d'impact
US20230077569A1 (en) 2020-02-17 2023-03-16 Exxonmobil Chemical Patents Inc. Propylene-based polymer compositions having a high molecular weight tail
KR20220144406A (ko) 2020-03-24 2022-10-26 보레알리스 아게 필름층용 폴리에틸렌 조성물
EP4126993A1 (fr) 2020-03-24 2023-02-08 Borealis AG Composition de polyéthylène pour une couche de film
WO2022018239A1 (fr) 2020-07-23 2022-01-27 Borealis Ag Copolymère d'éthylène multimodal
EP4029914A1 (fr) 2021-01-14 2022-07-20 Borealis AG Composition de polyoléfine hétérophasique
EP4257640B1 (fr) 2022-04-04 2024-08-28 Borealis AG Tuyau comprenant une composition de polypropylène
WO2024025741A1 (fr) 2022-07-27 2024-02-01 Exxonmobil Chemical Patents Inc. Compositions de polypropylène à durcissement par déformation amélioré et leurs procédés de production
EP4317216A1 (fr) 2022-08-03 2024-02-07 Abu Dhabi Polymers Co. Ltd (Borouge) LLC Composition de terpolymère d'éthylène basse densité
EP4389414A1 (fr) 2022-12-19 2024-06-26 Abu Dhabi Polymers Co. Ltd (Borouge) - Sole Proprietorship L.L.C. Film rétractable à assemblage multicouche
EP4389418A1 (fr) 2022-12-19 2024-06-26 Abu Dhabi Polymers Co. Ltd (Borouge) - Sole Proprietorship L.L.C. Film rétractable à assemblage multicouche

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Also Published As

Publication number Publication date
FI982388A0 (fi) 1998-11-04
WO2000026258A1 (fr) 2000-05-11
AU1163700A (en) 2000-05-22
FI982388A (fi) 2000-05-05

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