Catalyst Injection Technique In Addition Polymerization Processes Patents (Class 526/919)
  • Patent number: 11833479
    Abstract: Disclosed are a process and system for preparing a catalyst slurry. The process can include preparing a catalyst slurry comprising a solid particulate catalyst and a carrier liquid in a catalyst slurry preparation system. The catalyst slurry preparation system can include a mixing vessel, a rotatable impeller system connected to the mixing vessel, and a motor connected to the rotatable impeller system. The rotatable impeller system can include an agitator shaft and a hub connected to the agitator shaft. The hub and at least a portion of the agitator shaft are positioned within the mixing vessel along a longitudinal axis of the mixing vessel, and the hub has at least three blades.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: December 5, 2023
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: James E. Hein, Scott E. Kufeld
  • Patent number: 10647796
    Abstract: A method comprising preparing a multi-component catalyst system comprising a catalyst and a cocatalyst, and adjusting the level of at least one component of the catalyst system to maintain a user-desired level of catalyst activity throughout a process, wherein the component comprises a catalyst activator and wherein the catalyst activator comprises the catalyst or the cocatalyst. A method comprising contacting a polymerization catalyst system comprising a Ziegler-Natta catalyst and a cocatalyst with a catalyst activator at least twice during a polymerization process, wherein the polymerization process is carried out in a reactor system comprising multiple reactor types.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: May 12, 2020
    Assignee: FINA TECHNOLOGY, INC.
    Inventors: Kenneth P Blackmon, David Ribour, Shabbir Malbari, Tim Coffy, Michel Daumerie
  • Patent number: 9023958
    Abstract: A method for the delivery of a catalyst to a polymerization reactor is disclosed, comprising: contacting a catalyst with a carrier fluid comprising an inert hydrocarbon in gaseous form, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.; and flowing the carrier fluid to the polymerization reactor such that the carrier fluid transports the catalyst to the polymerization reactor. A catalyst delivery system is disclosed, comprising: a catalyst vessel for containing a catalyst; a catalyst injection line for delivering the catalyst to a polymerization reactor, the catalyst injection line being in fluid communication with the catalyst vessel and the polymerization reactor; and a carrier fluid line in fluid communication with the catalyst injection line for delivering a carrier fluid comprising an inert hydrocarbon to the catalyst injection line, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.
    Type: Grant
    Filed: October 25, 2012
    Date of Patent: May 5, 2015
    Assignee: Univation Technologies, LLC
    Inventors: Dale A. Wright, John R. Parrish, James L. Swecker, II, Mark G. Goode
  • Patent number: 8956573
    Abstract: The present invention relates to an apparatus and process for polymerizing olefins. One embodiment comprises polymerizing at least one monomer in a first loop reactor in the presence of a catalyst to produce a first polyolefin fraction. A portion of the first polyolefin fraction is transferred to a second loop reactor, connected in series with the first loop reactor. The process further comprises polymerizing in the second loop reactor at least one monomer in the presence of a catalyst to produce a second polyolefin fraction in addition to the first polyolefin fraction. The combination of the first and second polyolefin fractions can produce a polymer resin fluff having bimodal molecular weight distribution.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: February 17, 2015
    Assignee: Total Research & Technology Feluy
    Inventors: Louis Fouarge, Eric Damme, Olivier Miserque, Daniel Siraux, Philippe Bodart, Andre Lewalle, Marc Van der Auwera, Frans Van den Brande, Giacomo Conti, Hugo Vandaele, Mark Verleysen, Carl Van Camp, Etienne Laurent, Philippe Marechal, Marc Moers, Leopold D'Hooghe, Marjan Sillis, Kai Hortman, Pascal Folie, Renaud Oreins
  • Patent number: 8846831
    Abstract: The present invention relates to a method for feeding metallocene catalyst slurry to an olefin polymerization loop reactor (1) using a positive displacement device (5) positive displacement device comprising a first chamber and a second chamber, each chamber having an inlet and an outlet and each chamber comprising an ball arranged between the walls of said chamber, wherein said chambers are connected to each other by a pump chamber operably connected to a pump, wherein, the difference between the diameter of said ball and the diameter of said chamber is comprised between 5 to 200 times the average particle size (d50) of said catalyst.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: September 30, 2014
    Assignee: Total Research & Technology Feluy
    Inventors: Daan Dewachter, Alain Brusselle
  • Patent number: 8796400
    Abstract: A method for the copolymerization of ethylene and a C3+ olefin in a loop reactor and polymers formed therefrom are described herein. The method generally includes introducing an ethylene monomer, a C3+ olefin and a diluent carrier liquid into a loop reactor. A catalyst system can be supplied to said loop reactor. The diluent liquid, ethylene monomer, and C3+ olefin can be circulated through said loop reactor, while copolymerizing said ethylene and C3+ olefin in the presence of said catalyst system to produce a slurry. The slurry can be diverted into a settling leg, and sequentially discharged therefrom and withdrawn from said loop reactor. An ethylene monomer co-feed can be introduced into said loop reactor at spaced locations downstream of the ethylene and diluent. The ethylene co-feed can be introduced in an amount effective to reduce the variation in the ratio of ethylene and C3+ olefin.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: August 5, 2014
    Assignee: Total Research & Technology Feluy
    Inventors: Louis Fouarge, Eric Damme, Olivier Miserque, Daniel Siraux, Philippe Bodart, Andre Lewalle, Marc Van der Auwera, Frans Van den Brande, Giacomo Conti, Hugo Vandaele, Mark Verleysen, Carl Van Camp, Etienne Laurent, Philippe Marechal, Marc Moers, Leopold D'Hooghe, Marjan Sillis, Kai Hortman, Pascal Folie, Renaud Oreins
  • Patent number: 8735514
    Abstract: A method for feeding an antistatic compound to a polymerization reactor, the method comprising the steps of: a) dispersing, under mixing conditions, a catalyst powder and an antistatic compound in a liquid medium, so as to form a suspension of the catalyst powder and of the antistatic compound in the liquid medium; b) transferring the obtained suspension to a polymerization reactor.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: May 27, 2014
    Assignee: Basell Polyolefine GmbH
    Inventors: Pietro Baita, Paolo Ferrari, Ines Mingozzi, Lorella Pedriali, Maria Di Diego, Roberta Pica
  • Patent number: 8729199
    Abstract: The present invention relates to a process for cleaning a catalyst slurry preparation system and/or a catalyst preparation system. More particularly, the invention relates to a cleaning process for a catalyst preparation system and/or for a catalyst slurry preparation system, wherein an aqueous catalyst inactivation agent is used to rinse the systems, or any parts thereof. The catalysts used in the present invention may be chromium, Ziegler-Natta or metallocene catalysts.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: May 20, 2014
    Assignee: Total Research & Technology Feluy
    Inventor: Daan Dewachter
  • Patent number: 8703883
    Abstract: Polymerization reactor systems providing real-time control of the average particle size of catalyst system components are disclosed. Methods for operating such polymerization reactor systems also are described.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: April 22, 2014
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Max P. McDaniel, Joel A. Mutchler
  • Patent number: 8703885
    Abstract: The present invention relates to a method for producing a catalyst slurry blend suitable for polymerizing ethylene in an ethylene polymerization loop reactor for obtaining an at least trimodal polyethylene product, comprising the steps of: transferring a first ethylene polymerization catalyst at a first mass flow rate to a mixing vessel, simultaneously transferring a second ethylene polymerization catalyst at a second mass flow rate to said mixing vessel, thereby in situ providing a catalyst slurry blend, wherein said second ethylene polymerization catalyst is different from the first ethylene polymerization catalyst, adjusting and monitoring said first and second mass flow rates, thereby obtaining said catalyst slurry blend at a concentration suitable for polymerizing ethylene, and feeding said catalyst slurry blend to an ethylene polymerization double loop reactor producing said at least trimodal polyethylene product.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: April 22, 2014
    Assignee: Total Research & Technology Feluy
    Inventors: Daan Dewachter, Martine Slawinski
  • Patent number: 8383741
    Abstract: The present invention relates to the control of flow of a particulate feed to a reactor, and in particular provides a process for providing a slurry of particulate matter to a reactor, comprising providing a slurry comprising said particulate matter and diluent, and passing said slurry to the inlet of a reactor feed pump from where it is then pumped to the reactor, characterized in that a stream of additional diluent is also passed to the inlet of the reactor feed pump, the reactor feed pump is operated at an essentially constant volumetric flow rate, and the amount of particulate matter in slurry passed into the reactor is adjusted by adjusting the flow.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: February 26, 2013
    Assignee: Ineos USA LLC
    Inventor: Mark A. Gessner
  • Patent number: 8362160
    Abstract: The present invention relates to methods for delivering granulated material to a reactor for use in the polymerization of alpha-olefin comprising the steps of: providing a first conduit having a granulated material inlet, the conduit being operably connected to a pocket ball valve comprising at least one pocket, said pocket ball valve being operably connected to a second conduit, said second conduit being operably connected to a polymerization reactor; introducing a granulated material to the first conduit through said inlet; metering the granulated material through the pocket ball valve; and passing said material through the second conduit to the polymerization reactor. The present invention also relates to polyolefin production processes and polyolefin producing units.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: January 29, 2013
    Assignee: Total Petrochemicals Research Feluy
    Inventors: Yahya Bouquoyoue, Claude Queyrel
  • Patent number: 8273835
    Abstract: Process for the preparation of ethylene homopolymers or copolymers in the presence of free-radical polymerization initiators at from 100° C. to 350° C. and pressures in the range of from 160 MPa to 350 MPa in a tubular reactor with at least two spatially separated initiator injection points, wherein injecting initiator rises the temperature of the reaction mixture in the reaction zone following the injection point, and the first initiator injection point of the tubular reactor is not provided with initiator or is provided with so little initiator that the temperature of the reaction mixture does not rise more than 20° C.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: September 25, 2012
    Assignee: Basell Polyolefine GmbH
    Inventors: Dieter Littmann, Andre-Armand Finette, Hans Joachim Meinke
  • Patent number: 8217124
    Abstract: Process for the preparation of ethylene homopolymers or copolymers in a high pressure reactor with at least two spatially separated initiator injection points by polymerizing ethylene and optionally further monomers in the presence of at least two different mixtures of free-radical polymerization initiators at from 100° C. to 350° C. and pressures in the range of from 160 MPa to 350 MPa, wherein the process comprises the following steps: a) providing at least two different initiators as solution in a suitable solvent or in liquid state, b) mixing the initiators and optionally additional solvent in at least two static mixers and c) feeding each of the mixtures to a different initiator injection point of the high pressure reactor, and apparatus for feeding initiator mixtures to a high pressure reactor with at least two spatially separated initiator injection points.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: July 10, 2012
    Assignee: Basell Polyolefine GmbH
    Inventors: Dieter Littmann, Andre-Armand Finette, Jürgen Peter Mohrbutter, Sven George Wolfram
  • Patent number: 7989562
    Abstract: A system and method for olefin polymerization is provided. The method includes polymerizing one or more olefins within a reactor having one or more injection tubes in fluid communication therewith, at least one of the one or more injection tubes having two or more concentric flow paths; flowing a catalyst through a first flow concentric path of the injection tube into the reactor; flowing one or more monomers through a second concentric flow path of the injection tube into the reactor; measuring rate of heat removal within the reactor; and adjusting the one or more monomers flow through the injection tube in response to the rate of heat removal in the reactor.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: August 2, 2011
    Assignee: Univation Technologies, LLC
    Inventors: Kersten A Terry, Mark W. Blood, John H. Oskam, Timothy R. Lynn, Bruce J. Savatsky, Mark B. Davis
  • Patent number: 7906597
    Abstract: The present invention relates to an apparatus for preparing and supplying catalyst to an ethylene slurry loop polymerisation reactor and to an apparatus for controlling the injection of catalyst slurry in a polymerization reactor wherein polyethylene is prepared. The present invention a Iso relates to a method for optimising catalyst supply to a polymerisation reactor. The diluted catalyst is transferred to the reactor (1) using a membrane pump (5) controllable in function of the concentration of a reactant in said reactor (1).
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: March 15, 2011
    Assignee: Total Petrochemicals Research Feluy
    Inventor: Louis Fouarge
  • Patent number: 7904271
    Abstract: The present invention relates to a method for determining activity of a catalyst in a polymerization process, said polymerization process comprising the steps of feeding a catalyst and a diluent into a storage vessel, to form a concentrated settled catalyst, feeding said concentrated settled catalyst into a mixing vessel equipped with mixing means and feeding hydrocarbon diluent into said mixing vessel, to form a diluted catalyst slurry, feeding said diluted catalyst slurry into a polymerization reactor via a volumetric pump, and feeding at least one monomer into said polymerization reactor to form a polymer.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: March 8, 2011
    Assignee: Total Petrochemicals Research Feluy
    Inventors: Daniel Siraux, Alain Brusselle
  • Patent number: 7781547
    Abstract: The invention relates to new polymerization processes using hydrofluorocarbons to produce polymers. In particular, the invention relates to new polymerization processes using turbulent flow reactor systems using diluents including one or more hydrofluorocarbon(s) to produce polymers.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: August 24, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Yuan-Ju (Ray) Chen, Michael Francis McDonald, Timothy Daniel Shaffer, David Yen-Lung Chung, Robert Norman Webb
  • Patent number: 7652108
    Abstract: Process for the gas-phase polymerization of one or more alpha-olefins in the presence of a catalyst system, the process comprising: contacting in a continuous way one or more of said alpha-olefins with said catalyst system in a prepolymerization reactor, wherein the reaction is carried out in a liquid medium at a temperature ranging from 23° to 50° C.; feeding in continuous the prepolymer obtained in step a) into a gas-phase reactor having interconnected polymerization zones, where the growing polymer particles flow upward through a first polymerization zone (riser) under fast fluidization or transport conditions, leave said riser and enter a second polymerization zone (downcomer) through which they flow downward under the action of gravity, leave said downcomer and are reintroduced into said riser; wherein the prepolymer obtained from step a) is continuously fed at a section of said riser characterized by an upwardly gas velocity higher than 3.0 m/s.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: January 26, 2010
    Assignee: Basell Poliolefine Italia s.r.l.
    Inventors: Gabriele Mei, Massimo Covezzi, Stefano Bertolini
  • Patent number: 7645843
    Abstract: Olefins are polymerised in the presence of a solid catalyst component and optionally a cocatalyst. The solid catalyst component is introduced into the polymerisation reactor by suspending the solid component into oil having a viscosity of from 20 to 1500 mPa s. Optionally, the suspension comprises a drag reduction agent dissolved in the oil. The suspension is metered into the polymerisation reactor by using a valveless piston pump.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: January 12, 2010
    Assignee: Borealis Technology Oy
    Inventors: Erno Elovainio, Marianne Vuorikari, Esa Korhonen, Pauli Leskinen
  • Patent number: 7645842
    Abstract: The invention relates to a method for radical polymerization of one or several ethylenically unsaturated compounds, characterized in that it consists in providing at least 80.8 percent by weight ethylenically unsaturated compounds in relation to the total weight of the ethylenically unsaturated compounds, adding at least one polymerization initiator for radical polymerization in at least two steps, wherein more polymerization initiator is added in the second step than in the first.
    Type: Grant
    Filed: August 1, 2005
    Date of Patent: January 12, 2010
    Assignee: Rohmax Additives GmbH
    Inventors: Francois Acker, Markus Scherer, Alexander Dardin, Stephan Massoth, Bernd Amrhein, Detlef Bloos, Valerie Dittgen, Alain Roos, Jean-Marc Beiner
  • Patent number: 7572867
    Abstract: There is disclosed a process for producing a conjugated diene-containing polymer wherein a stream comprising conjugated diene monomer and a specified catalyst, that includes a lanthanide compound and an aluminoxane, is passed through an orifice into the reaction zone of a polymerization vessel, maintained under specific pressure conditions to form a cement having a viscosity that allows the cement to be conveyed through a devolatilization zone, where desired.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: August 11, 2009
    Assignee: Bridgestone Corporation
    Inventors: Timothy L. Tartamella, Steven Luo, Mark Smale, Kevin M. McCauley
  • Patent number: 7527175
    Abstract: To meter catalysts into a reactor, the catalyst is firstly suspended in a hydrocarbon in a reservoir and the suspension obtained is kept in motion by stirring and then fed via a three-way metering valve and an ejector into the actual reactor, wherein the suspension containing the catalyst is firstly discharged from the reservoir by means of a pump and continuously circulated by returning the suspension via the three-way metering valve within a closed piping system to the reservoir, subsequently setting a pressure in the reservoir which is from 0.1 to 30 bar higher than the pressure in the reactor and then continuously introducing the suspension into the reactor via a flow meter which controls the three-way metering valve and via a downstream ejector by pulse operation of the now open three-way metering valve.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: May 5, 2009
    Assignee: Basell Polyolefine GmbH
    Inventors: Hermann Gebhart, Volker Dolle, Elisabeth Glattki-Mayer, legal representative, Angel Sanchez, Herbert Plötz, Peter Götz, Franz Langhauser, Klaus-Peter Mayer
  • Patent number: 7504462
    Abstract: Disclosed is to provide a process for producing an olefin polymer by continuous polymerization according to which the transition metal compound and the co-catalyst component promptly contact after they are fed to the polymerization reaction tank. The above process for producing an olefin polymer comprises continuously polymerizing an olefinic monomer in the presence of a polymerization catalyst obtained by contact treatment of a transition metal compound and a co-catalyst component in a polymerization reaction tank in which an agitation shaft having an agitating blade is suspended in the central part of the tank.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: March 17, 2009
    Assignee: Sumitomo Cheimcal Company, Limited
    Inventor: Hisakatsu Hama
  • Patent number: 7321016
    Abstract: Provided is a method of preparing styrene polymers, the method comprising: homogeneously mixing a styrene monomer; a cocatalyst mixture of Group 13 metal-containing organic metal compound cocatalyst and an inert organic solvent; and a catalyst mixture of a metallocene catalyst and the inert organic solvent using a high speed homogenizing mixer to obtain a homogenized mixture; and providing the homogenized mixture to a reactor to initiate polymerization. In this method, catalyst is quickly dispersed among monomers using a high speed homogenizing mixer so that formation of gel, which occurs when a syndiotactic styrene polymer is produced, can be fundamentally prevented. In addition, a styrene polymer prepared using the method has high activity, good stereoregularity, and uniform molecular distribution.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: January 22, 2008
    Assignee: LG Chem, Ltd.
    Inventors: Mooho Hong, Sang Hoon Lee, Boo Gon Woo
  • Patent number: 7288610
    Abstract: A polymerization method in which a first liquid and a second liquid are mixed in a gas phase and polymerized in the form of droplets is disclosed, wherein a polymerizable monomer and a polymerization initiator are each contained in at least one of the first liquid and the second liquid, and at least one of the first liquid and the second liquid is injected in a spatially expanding film shape. By employing the polymerization method of this invention, high-quality polymer can be efficiently produced in large quantity by the droplet polymerization even using a polymerizable monomer with a rapid reaction rate.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: October 30, 2007
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Taisuke Ishii, Yoshiaki Mori, Shunichi Himori, Kiichi Itoh
  • Patent number: 7235614
    Abstract: A polymerization process and a catalyst delivery system are provided. For example, a polymerization process is described, including providing a conduit having a catalyst inlet, a first propylene stream inlet located downstream of the catalyst inlet, and a second propylene stream inlet located downstream of the first propylene stream inlet, the conduit being operably connected to a polymerization vessel, introducing a catalyst to the conduit through the catalyst inlet, and passing the catalyst through the conduit to the polymerization vessel. The process may further include introducing a first propylene stream to the conduit to provide a mixed catalyst stream downstream of the catalyst inlet. The process may additionally include stopping the flow of the catalyst passing through the conduit, introducing a second propylene stream to the conduit through the second propylene stream inlet, removing a section of the conduit, and replacing the removed section of the conduit with a different conduit section.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: June 26, 2007
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Lawrence Carl Smith, Randell Wayne Dickey, Robin Lynne Rubish
  • Patent number: 7232868
    Abstract: A polymerization process is provided. For example, a polymerization process is described, including providing a catalyst slurry having a metallocene catalyst and a first oil, providing a transport medium including a second oil and combining the transport medium and the catalyst slurry to form a catalyst mixture. The process may further include introducing the catalyst mixture to a polymerization reactor and contacting olefin monomers with the catalyst mixture to polymerize the olefin monomers and form polyolefins.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: June 19, 2007
    Assignee: Exxon/Mobil Chemical Patents Inc.
    Inventors: Lawrence Carl Smith, James Charles Vizzini, Ted Alexander Powell, Terry John Burkhardt, Anthony Nicholas Speca, Shiaw Tzuu Ju
  • Patent number: 7071273
    Abstract: Provided are a tetrafluoroethylene copolymer excellent in paste extrudability, which comprises a unit based on tetrafluoroethylene and a unit based on a monomer represented by a formula of CF2?CF—O—(CF2)nCF?CF2 (wherein n is an integer of from 1 to 6), wherein a content of the unit based on the monomer represented by the formula is from 0.1 to 0.5% by mass, wherein a particle size of a primary particle is from 0.1 to 0.5 ?m, wherein a standard specific gravity is from 2.14 to 2.25, wherein a paste extrusion pressure is from 24.5 to 73.5 MPa and wherein the copolymer remains not undergoing melt molding; a fine powder of a tetrafluoroethylene copolymer; and a production method and a paste extruded product thereof. The TFE copolymer is excellent in paste extrudability and the molded product thereof is excellent in heat resistance and transparency.
    Type: Grant
    Filed: November 22, 2004
    Date of Patent: July 4, 2006
    Assignee: Asahi Glass Company, Limited
    Inventors: Shigeki Kobayashi, Shinya Higuchi, Masataka Arai, Hiroki Nagai
  • Patent number: 6995235
    Abstract: Films and methods of forming films comprising first combining in a reactor olefins, a catalyst composition and an activator; wherein the activator is present from less than 50 wt % in a diluent by weight of the activator and diluent; followed by isolating a polyolefin having a density of from 0.940 to 0.980 g/cm3; and finally, extruding the polyolefin into a film having a gel count of less than 200 gels/m2.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: February 7, 2006
    Assignee: Univation Technologies, LLC
    Inventors: Fred D. Ehrman, Rainer Kolb, Chi-I Kuo, Porter C. Shannon, Keith W. Trapp
  • Patent number: 6822060
    Abstract: A process for producing a tetrafluoroethylene polymer, which comprises polymerizing tetrafluoroethylene in an aqueous medium in the presence of a dispersant, a stabilizer and a polymerization initiator, wherein the polymerization initiator is a redox polymerization initiator comprising a halogen acid salt YXO3/a sulfite Z2SO3 wherein X is a chlorine atom, a bromine atom or an iodine atom, Y is a hydrogen atom, ammonium, an alkali metal or an alkaline earth metal, and Z is ammonium, an alkali metal or an alkaline earth metal. By this process, it is possible to obtain a tetrafluoroethylene polymer which is suitable for a stretching operation after paste extrusion.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: November 23, 2004
    Assignee: Asahi Glass Company, Limited
    Inventors: Shigeki Kobayashi, Jun Hoshikawa, Kazuo Kato, Hiroki Kamiya, Hiroyuki Hirai
  • Publication number: 20040230014
    Abstract: The object of the present invention is to provide a polyolefin polymerization method which prevents fine particles of polymer from scattering from a fluidized bed in a gas phase polymerization reactor.
    Type: Application
    Filed: April 5, 2004
    Publication date: November 18, 2004
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventor: Katsutoshi Kougo
  • Patent number: 6639048
    Abstract: A process for reducing the residual monomer amount in aqueous polymer dispersions comprises aftertreating with a redox initiator system.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: October 28, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Claudia Wood, Reinhard Schneider, Eberhard Beckmann
  • Patent number: 6630549
    Abstract: A method for producing an olefin homopolymer or an olefin copolymer from an olefin or an olefin and at least one comonomer copolymerizable therewith by continuous slurry polymerization or continuous gaseous phase polymerization in the presence of a metallocene catalyst, the method comprising transferring the catalyst to a polymerizer and introducing the catalyst into the polymerizer while continuously feeding the olefin or the olefin and the comonomer into the polymerizer, to thereby effect a homopolymerization of the olefin or a copolymerization of the olefin and the comonomer, wherein, said catalyst is subjected to hydrogen gas-treatment in which said catalyst is contacted with hydrogen gas.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: October 7, 2003
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventor: Tatsuya Koike
  • Patent number: 6624266
    Abstract: Preactivated unsupported catalyst compositions methods of using them are disclosed whereby the compositions have a concentration of preactivated catalyst of at least about 0.04 mmol of preactivated catalyst per liter of solution when using aliphatic or alicyclic hydrocarbon solvents, and a concentration of less than about 0.80 mmol/liter when using aromatic or halogen-substituted solvents. In the method, an unsupported catalyst precursor first is contacted with an activator, or co-catalyst, in a suitable reaction medium, and then the resulting mixture is contacted with additional solvent to form a preactivated unsupported olefin polymerization catalyst composition that can be fed to a gas phase polymerization reactor without plugging the catalyst injection nozzle.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: September 23, 2003
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Kersten Anne Terry, Jody Michael Moffett, William George Sheard
  • Patent number: 6610799
    Abstract: A process for olefin polymerization in a reaction vessel, said process comprising polymerizing at least one &agr;-olefin in a polymerization stage employing a catalyst feed comprising 1) a first catalyst composition having at least two active catalytic sites capable of producing a first set of polymer components; 2) a second catalyst composition having at least two active catalytic sites capable of giving essentially the same set of polymer components as produced by the catalyst in feed (1) under the same polymerization conditions but these components in a different ratio to those produced by the catalyst composition of feed (1); wherein the amounts of catalyst compositions (1 and 2) fed into the reaction vessel are independently controlled.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: August 26, 2003
    Assignee: Borealis Technology Oy
    Inventors: Arild Follestad, Vidar Almqvist, Ketil Strand Andersen, Richard Blom, Ivar Martin Dahl, Arild Geir Andersen
  • Patent number: 6462138
    Abstract: A process is described for reducing the residual monomer content in a liquid solution, mixture, melt, suspension or dispersion of a polymer by postpolymerization with addition of a redox initiator system at a reaction temperature appropriate to it and with an extremely short mixing time of the liquid system in the production reactor by metering—gradually, in portions or continuously—at least one of the redox initiator components required to initiate polymerization of the residual monomers over a period (metering time) which is from about 10 to 250 times the mixing time of the liquid system in said reactor.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: October 8, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Robert Rupaner, Sven Lawrenz, Johannes Dobbelaar, Gerhard Bauer, Franz-Josef Mueseler, Werner Kirchner, Bradley Ronald Morrison, Jürgen Nahstoll, Martin Meister, Reinhard Bächer, Wolfgang Hübinger, Gerhard Schumacher
  • Patent number: 6398463
    Abstract: A process for introducing a solid catalyst particle feed into a fluidised or agitated vessel utilising a feed delivery device, a vertical feed dilution pipe and a feed injection pipe connected to the vessel, the process including the steps of: (a) introducing the solid catalyst particles feed from the feed delivery device into the vertical feed dilution pipe, (b) diluting the solid catalyst particles feed by letting the solid particle reaching by gravity their terminal velocity in the feed dilution pipe, (c) introducing the diluted solid catalyst particles feed into the injection pipe and mixing it with conveying gas, and introducing the gas conveyed diluted solid catalyst particles feed into the vessel.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: June 4, 2002
    Assignee: BP Chemicals Limited
    Inventor: Frederic Robert Marie Michel Morterol
  • Patent number: 6365695
    Abstract: Liquid catalyst composition is fed to a fluidized bed olefin polymerization reactor through an ultrasonic nozzle, enabling improved control over average catalyst composition droplet size and size distribution, which provides better control over resin particle size. The spray may be surrounded by a shroud of gas which creates a particle lean zone, thus reducing the likelihood of contact by the catalyst composition with existing product particles already suspended in the fluid bed.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: April 2, 2002
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Arakalgud Venkatapathia Ramamurthy, Clark Curtis Williams
  • Patent number: 5859157
    Abstract: A process for the gas phase polymerization of olefins. In this process a transition metal-containing solid catalyst component is introduced into a cylindrical section of a vertically disposed reactor in a first stream. A second stream, comprising an organometallic cocatalyst component is simultaneously separately introduced into the said cylindrical section of a vertically disposed reactor at a distance from the point of introduction of the first stream of no more than about 20% of the inside diameter of the tubular reactor.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: January 12, 1999
    Assignee: Equistar Chemicals, LP
    Inventors: Kiran M. Gupte, Joel A. Mutchler, Keta M. Lindstrom
  • Patent number: 5187245
    Abstract: A method of addition of polymerization initiator in the process of suspension polymerization or emulsion polymerization polymerizing a polymerizable monomer in aqueous medium, comprising introducing a low-temperature-active polymerization initiator taking part in the polymerization reaction to a piping system filled beforehand with water and successively adding said initiator in the piping system to polymerization system within 20 minutes using water.
    Type: Grant
    Filed: January 2, 1992
    Date of Patent: February 16, 1993
    Assignee: Tosoh Corporation
    Inventors: Tatsumi Nakamura, Mineo Nagano
  • Patent number: 5019632
    Abstract: A free-radical initiated process for preparing fluorinated polymers wherein at least one gaseous fluoroolefin is polymerized in a stirred polymerizer, the improvement comprising preparing a non-volatile polymeric seed in a reaction zone separate from the polymerizer by decomposing initiator in the presence of fluoromonomer to form oligomeric free radicals and condensing said radicals onto previously prepared polymer; and conveying said non-volatile seed to the polymerizer.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: May 28, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Edgar W. Slocum, Aquiles C. Sobrero, Robert C. Wheland
  • Patent number: 4921919
    Abstract: The process and the system are used for carrying out the quench-cooled, vapor-phase polymerization of olefin monomer in a horizontally disposed reactor vessel which comprises contacting olefin monomer, or a mixture of olefin monomers, with a polymerization catalyst system in the presence of hydrogen in the reactor vessel to form a polymer product. The improvement comprises introducing a titanium-containing catalyst component of the catalyst system into the top side of the reactor vessel at a point adjacent to the upstream end of the reactor vessel and introducing a cocatalyst plus modifer component of the catalyst system into the top side of the reactor vessel at a distance, downstream of the point of introduction of the titanium-containing catalyst component, which is equal to 25% of the inside diameter of the reactor vessel.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: May 1, 1990
    Assignee: Amoco Corporation
    Inventors: Chi-Hung Lin, Jack F. Stevens, Benjamin S. Tovrog, Philip M. Rose
  • Patent number: 4687381
    Abstract: Device and process for introducing a powder with catalytic activity into a fluidized bed polymerization reactor (1), the said device comprising:a storage enclosure (2) for powder with catalytic activity, provided with a feed line (3) for powder with catalytic activity and a shut-off valve (26), this enclosure being connected to a metering device (4) making it possible to deliver periodically a given volume of powder with catalytic activity,an intermediate chamber (5), placed below the metering device to receive direct the powder delivered by the latter, this intermediate chamber comprising in its upper part a tube (6) bringing in a inert carrier gas, provided with a shut-off valve,piping for conveying the powder (8) connecting the bottom part of the intermediate chamber to the fluidized-bed reactor, this piping having a portion which is more or less horizontal, the said powder conveying piping being provided with a full-bore rapid-opening valve (10).
    Type: Grant
    Filed: March 26, 1985
    Date of Patent: August 18, 1987
    Assignee: BP Chemicals Limited
    Inventors: Andre Dumain, Charles Raufast
  • Patent number: 4621124
    Abstract: A catalyst system for use in the polymerization of ethylene under high pressure and temperature containing an alkyl-aluminum or alkylsiloxalane activator and a compound of the formula:(TiCla) (MgCL.sub.2).sub.y (AlCl.sub.3)z (RMgCl).sub.bin whicha is from 2 to 3;y is 2 or more;z is from 0 to 1/3;b is from 0 to 1; andR is an aliphatic or aromatic hydrocarbon radical.
    Type: Grant
    Filed: September 16, 1985
    Date of Patent: November 4, 1986
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventors: Jean-Marie Neyer, Jean-Pierre Machon, Karel Bujadoux
  • Patent number: 4210734
    Abstract: A high-temperature, high-pressure process for polymerizing ethylene in a reactor system having at least two reaction zones with a catalytic system including an activator (a), a compound (b), and a compound (c). Compounds (b) and (c) are injected into different reaction zones. Activator (a) is selected from hydrides and organometallic compounds of a metal of groups I to III of the Periodic Table. Compound (b) is represented by the formula(TiCl.sub.a) (MgCl.sub.2).sub.y (AlCl.sub.3).sub.z (RMgCl).sub.bin which2.ltoreq.a.ltoreq.3, y.gtoreq.2, O.ltoreq.z .ltoreq.1/3, O.ltoreq.b.ltoreq.1and R is an aliphatic or aromatic hydrocarbon radical.Compound (c) is represented by the formulaTiCl.sub.3 (AlCl.sub.3).sub.w (E, TiCl.sub.4).sub.xin which O.ltoreq.w.ltoreq.1/3, O.ltoreq.x.ltoreq.0, 03 and E is a diisoamyl- or di-n-butylether.The amounts of (a), (b), and (c) are such that the ratio Al/Ti is between 1 and 10 in each reaction zone.
    Type: Grant
    Filed: August 3, 1978
    Date of Patent: July 1, 1980
    Assignee: Societe Chimique des Charbonnages-CdF Chimie
    Inventor: Jean P. Machon
  • Patent number: 4158571
    Abstract: Bingham fluid compositions are provided which contain a functional material such as a polymerization initiator dispersed in a solid continuous phase, which is a mixture of a wax and a liquid hydrocarbon. Such compositions are prepared by heating the wax and the liquid hydrocarbon to form a melt and dispersing the functional material in the melt. Upon cooling, the composition solidifies with the functional material being uniformly dispersed throughout the continuous solid phase. The compositions, while solid at ambient temperature and pressure, assume the flow characteristics of a liquid under an applied pressure and can be pumped to feed the functional material to a polymerization reactor or molten polymer on a continuous basis.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: June 19, 1979
    Assignee: Gulf Oil Corporation
    Inventors: Thomas J. Lynch, Robert J. Rowatt
  • Patent number: 4145498
    Abstract: Continuous or incremental addition of a coupling agent, such as silicon tetrachloride, during the polymerization step of organolithium initiated polymerization processes results in polymers of improved processability, as well as other improved properties such as high green strength, low die swell, and minimal shrinkage on extrusion.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: March 20, 1979
    Assignee: Phillips Petroleum Company
    Inventor: Ralph C. Farrar