Utilizing Material During Polymerization To Prevent Or Remove Reactor Buildup, E.g., Fouling, Clogging, Etc. Patents (Class 526/74)
  • Patent number: 10559777
    Abstract: A radiation curable resin composition comprising: (A) metal oxide particles; (B) at least one photoinitiator, preferably a radical photoinitiator, or any mixture thereof; (C) at least one acrylate or methacrylate component with a ClogP higher than 2, preferably higher than 4, more preferably higher than 5, or any mixture thereof; (D) at least one monofunctional acrylate or methacrylate diluent component, preferably with a viscosity below 40 mPa·s at 20° C., or any mixture thereof; (E) at least one acrylate or methacrylate component with functionality equal or higher than 3, preferably 3 or 4, or any mixture thereof; can be advantageously used, for example, in multilayer barrier stacks for the production of organic opto-electric or opto-electronic device, such as Organic Light Emitting Diode (OLED).
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: February 11, 2020
    Assignee: BASF Coatings GmbH
    Inventors: Emilie Galand, Zakaria Belbakra, Zoubair Cherkaoui, Richard Frantz
  • Patent number: 10308731
    Abstract: A method for feeding an antistatic compound to a polymerization reactor comprising the steps of: a) dispersing, under mixing conditions, a catalyst powder and an antistatic compound in an oil, so as to form a suspension of catalyst powder and antistatic compound in said oil; b) successively adding, under mixing conditions, a molten thickening agent to said suspension from step a), while maintaining said suspension at a temperature such that said thickening agent solidifies on contact with said suspension; c) transferring the product obtained from b) to a polymerization reactor.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: June 4, 2019
    Assignee: Basell Polyolefine GmbH
    Inventors: Pietro Baita, Paolo Ferrari, Ines Mingozzi, Lorella Pedriali, Maria Di Diego, Roberta Pica
  • Patent number: 9938359
    Abstract: A process for the preparation of ethylene polymers comprising polymerizing ethylene, optionally with one or more ?-olefin comonomers, in the presence of: (i) a solid catalyst component comprising titanium, magnesium, halogen and optionally an internal electron-donor compound, (ii) an aluminum alkyl compound, and (iii) an antistatic compound selected among the hydroxyesters with at least two free hydroxyl groups, wherein the weight ratio of aluminum alkyl compound to solid catalyst component is higher than 0.80 and the weight ratio of antistatic compound to aluminum alkyl compound is higher than 0.10.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: April 10, 2018
    Assignee: Basell Poliolefine Italia S.r.l.
    Inventors: Massimo Covezzi, Gabriele Mei, Pietro Baita, Lorella Marturano
  • Patent number: 9469703
    Abstract: A process and apparatus for producing olefin polymers are disclosed, comprising: a. polymerizing one or more olefins in the gas phase, in the presence of an olefin polymerization catalyst, whereby growing polymer particles flow along a cylindrically-shaped downward path in densified form under the action of gravity so as to form a densified bed of downward-flowing polymer particles b. allowing said polymer particles to flow through a restriction of the densified bed, such restriction being positioned in a restriction zone extending from the bed upward to a distance of 15% of the total height of the densified bed; and c. metering an antistatic agent through a feed line connected to the densified bed at a feed point being located in a feed zone extending from the top of the restriction upward, to a distance five times the diameter of the section of the densified bed above the restriction.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: October 18, 2016
    Assignee: Basell Poliolefine Italia S.r.l.
    Inventors: Enrico Balestra, Tiziana Caputo, Maurizio Dorini, Antonio Mazzucco, Silvia Soffritti
  • Patent number: 9261790
    Abstract: A resist underlayer film-forming composition for forming a resist underlayer film having both dry etching resistance and heat resistance. A resist underlayer film-forming composition comprising a polymer containing a unit structure of Formula (1): In Formula (1), R3 is a hydrogen atom, and both n1 and n2 are 0. A method for producing a semiconductor device comprising the steps of: forming an underlayer film on a semiconductor substrate using the resist underlayer film-forming composition; forming a hard mask on the underlayer film; further forming a resist film on the hard mask; forming a resist pattern by irradiation with light or electron beams and development; etching the hard mask using the resist pattern; etching the underlayer film using the hard mask patterned; and fabricating the semiconductor substrate using the patterned underlayer film.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: February 16, 2016
    Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Yasunobu Someya, Keisuke Hashimoto, Tetsuya Shinjo, Hirokazu Nishimaki, Ryo Karasawa, Rikimaru Sakamoto
  • Patent number: 8993692
    Abstract: A process for polymerizing ethylene to produce an ethylene-based polymer including contacting ethylene with a Ziegler-Natta procatalyst, an alkylaluminum cocatalyst and a self limiting agent selected from the group of aliphatic, cycloaliphatic, substituted cycloaliphatic or aromatic esters, anhydrides and amides such that the self limiting agent reduces polymerization rates to no greater than 40% of the polymerization rate in the absence of the self limiting agent at temperatures equal to or greater than 120° C. is provided.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: March 31, 2015
    Assignee: Dow Global Technologies LLC
    Inventors: Robert J. Jorgensen, Sean W. Ewart, Richard E. Campbell, Jr., Daryoosh Beigzadeh, Robert D. Froese, Peter M. Margl
  • Publication number: 20150087793
    Abstract: A catalyst composition may include a precontacted mixture of an olefin polymerization catalyst and an agent including an ammonium salt. The catalyst activity of the catalyst composition in the presence of water may be greater than if no ammonium salt were present in the catalyst composition. The ammonium salt may include a tetraalkylammonium salt, and the olefin polymerization catalyst may include a metallocene compound.
    Type: Application
    Filed: September 25, 2013
    Publication date: March 26, 2015
    Inventors: Albert P. Masino, Randall S. Muninger, Max P. McDaniel, Eric D. Schwerdtfeger, Qing Yang, Graham R. Lief
  • Patent number: 8981021
    Abstract: Various methods and systems for using oxygen in a polyolefin polymerization reactor system are provided. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as a gas-phase reactor system.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: March 17, 2015
    Assignee: Univation Technologies, LLC
    Inventors: Ronald S. Eisinger, Mark G. Goode
  • Patent number: 8957167
    Abstract: A polymerization process includes contacting the following in a gas-phase reactor system under polymerization conditions for making a polymer product: a metallocene-based catalyst system including a supported constrained geometry catalyst, at least one monomer, and an additive selected from a group consisting of an aluminum distearate, an ethoxylated amine, and a mixture thereof. The additive may be selected from a group consisting of an aluminum distearate, an ethoxylated amine, polyethylenimines, and other additives suitable for use in the production of polymers for food contact applications and end products, including a mixture of a polysulfone copolymer, a polymeric polyamine, and oil-soluble sulfonic acid, in a carrier fluid, and mixtures thereof.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: February 17, 2015
    Assignee: Univation Technologies, LLC
    Inventors: F. David Hussein, Kevin J. Cann, F. Gregory Stakem, Ann M. Schoeb-Wolters, Wesley R. Mariott, James M. Farley, Michael D. Awe
  • Patent number: 8946359
    Abstract: The present invention relates to a process of preparing a polyolefin in a loop reactor by introducing anti-fouling agent through a sleeve provided around at least part of the shaft of the pump. Also, the invention relates to the use of anti-fouling agent to prevent or reduce fouling by feeding the anti-fouling agent against the impeller of the pump upon introduction to the loop reactor.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: February 3, 2015
    Assignee: Total Research & Technology Feluy
    Inventors: Daniel Siraux, Aurélien Vantomme, Eric Damme, Daan Dewachter
  • Publication number: 20150031843
    Abstract: The present invention relates to an ethylene homo- or copolymerization process, characterized in that an inhibitor is added to the reaction mixture or any of its components before the reaction mixture is fed to the reaction zone. The present invention further relates to the use of an inhibitor to reduce fouling in an ethylene homo- or copolymerization process.
    Type: Application
    Filed: March 12, 2013
    Publication date: January 29, 2015
    Inventors: Thomas Hjertberg, Torbjorn Magnusson, Bjorn Voigt, Mattias Bergqvist, Kenneth Johansson, Marcus Kierkegaard, Annika Smedberg
  • Patent number: 8809473
    Abstract: A method for altering the polymer architecture of ethylene copolymers made with a supported phosphinimine polymerization catalyst. The method involves changing the amount of a catalyst modifier added to a reactor separately from or together with a supported phosphinimine polymerization catalyst.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: August 19, 2014
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Peter Phung Minh Hoang, Benjamin Milton Shaw, Patrick Lam, Victoria Ker, Cliff Robert Baar
  • Patent number: 8802584
    Abstract: A supported catalyst system comprising a phosphinimine ligand containing catalyst on a porous inorganic support treated with a metal salt has improved reactor continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: August 12, 2014
    Assignee: Nova Chemicals (International) S.A.
    Inventors: Lee Douglas Henderson, Peter Phung Minh Hoang, Ian Ronald Jobe, Xiaoliang Gao
  • Patent number: 8772426
    Abstract: Copolymers of ethylene and ?-olefins having (a) a density (D) in the range 0.900-0.940 g/cm3, (b) a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-50 g/10 min, (c) a melt index MI2 (2.16 kg, 190° C.) and Dow Rheology Index (DRI) satisfying the equation [DRI/MI2]>2.65, and (d) a Dart Drop Impact (DDI) in g of a blown film having a thickness of 25 ?m produced from the copolymer satisfying the equation DDI?1900×{1?Exp [?750(D?0.908)2]}×{Exp [(0.919?D)/0.0045]}. The copolymers may be prepared using metallocene catalysis and are preferably prepared in multistage processes carried out in loop reactors in the slurry phase. The copolymers exhibit long chain branching as defined by Dow Rheology Index (DRI) and exhibit unexpected improvements in mechanical properties, in particular dart drop impact, when extruded into blown films.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: July 8, 2014
    Assignee: Ineos Manufacturing Belgium NV
    Inventors: Choon Kooi Chai, Luc Marie Ghislain Dheur, Benoit Koch, Stefan Klaus Spitzmesser
  • 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: 8722818
    Abstract: Described herein are methods for monitoring and restoring electrical properties of polymerization reactor wall films. The method may comprise using a reactor wall monitor to monitor and determine an electrical property, such as the bed voltage or breakdown voltage, of the wall film. The method may further comprise adding continuity additive to the reactor and/or adjusting the feed rate of continuity additive being added to the reactor in response to the measured electrical property.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: May 13, 2014
    Assignee: Univation Technologies, LLC
    Inventors: Eric J. Markel, William A. Lamberti, Harry W. Deckman
  • Patent number: 8703884
    Abstract: A polymerization process is disclosed comprising polymerizing an olefin to form an olefin-based polymer in a polymerization reactor; and introducing a polyetheramine additive to the polymerization reactor. The process may further comprise monitoring static in the polymerization reactor; maintaining the static at a desired level by use of a polyetheramine additive, where the polyetheramine additive is present in the reactor in the range from about 0.1 to about 500 ppmw, based on the weight of polymer produced by the process.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: April 22, 2014
    Assignee: Univation Technologies, LLC
    Inventors: Wesley R. Mariott, F. David Hussein
  • Patent number: 8604140
    Abstract: The invention provides a method for preventing fouling in chemical equipment, comprising adding an antifouling agent which comprises a polyoxyalkylene polymer having Mn of 30,000 or less to a component in the chemical equipment.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 10, 2013
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Naoshi Nagai, Shiro Nakatsuka, Kazuoki Nakai, Kenji Sugimura, Yasushi Tohi, Ken Yoshitsugu, Hideki Bando, Yasuyuki Harada
  • Publication number: 20130296507
    Abstract: Olefin polymerization is carried out with a single site polymerization catalyst in the presence of a continuity additive. The continuity additive is a cocktail containing one or more dialkanolamide derived from a fatty acid, an oil soluble sulfonic acid and a dialkanolamine.
    Type: Application
    Filed: April 19, 2012
    Publication date: November 7, 2013
    Applicant: NOVA CHEMICALS (INTERNATIONAL) S.A.,
    Inventors: Peter Phung Minh Hoang, Benjamin Milton Shaw, Andy Mak
  • Publication number: 20130267666
    Abstract: A polymerization process is disclosed comprising polymerizing an olefin to form an olefin-based polymer in a polymerization reactor; and introducing a polyetheramine additive to the polymerization reactor. The process may further comprise monitoring static in the polymerization reactor; maintaining the static at a desired level by use of a polyetheramine additive, where the polyetheramine additive is present in the reactor in the range from about 0.1 to about 500 ppmw, based on the weight of polymer produced by the process.
    Type: Application
    Filed: December 6, 2011
    Publication date: October 10, 2013
    Applicant: UNIVATION TECHNOLOGIES, LLC
    Inventors: Wesley R. Mariott, F. David Hussein
  • Patent number: 8497330
    Abstract: Methods for gas phase olefin polymerization are provided. The method can include combining a spray dried catalyst system with a diluent to produce a catalyst slurry. The catalyst system can include a metallocene compound. Ethylene, a continuity additive, and the catalyst slurry can be introduced to a gas phase fluidized bed reactor. The reactor can be operated at conditions sufficient to produce a polyethylene. The spray dried catalyst system can have a catalyst productivity of at least 12,000 grams polyethylene per gram of the catalyst system.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: July 30, 2013
    Assignee: Univation Technologies, LLC
    Inventors: F. David Hussein, Kevin J. Cann, Ann M. Schoeb-Wolters, Phuong A. Cao, Bruce J. Savatsky, Eric J. Markel, Daniel P. Zilker, Jr., Garth R. Giesbrecht
  • Patent number: 8431096
    Abstract: The current invention provides a method of improving the efficiency of one or more heat exchangers used in cooperation with a high temperature solution polymerization process. Addition of surface active agents, such as C6 to C22 carboxylic acids, to a two phase liquid-liquid polymer solution downstream of a reactor system and upstream of a heat exchanger system can increase the efficiency of heat exchange by more than 10 %.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: April 30, 2013
    Assignee: Nova Chemicals (International) S.A
    Inventors: Eric Cheluget, Arun Sood
  • Patent number: 8383739
    Abstract: Systems and methods for monitoring a polymerization reactor are provided. The method can include estimating an acoustic condition of a polymer produced in a reactor. The method can also include estimating a stickiness control parameter of the polymer produced in the reactor. The method can further include pairing the acoustic condition with the stickiness control parameter to provide a paired acoustic condition and stickiness control parameter.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: February 26, 2013
    Assignee: Univation Technologies, LLC
    Inventors: Michael E. Muhle, Richard B. Pannell, Eric J. Markel, Robert O. Hagerty
  • Patent number: 8378040
    Abstract: A method for cleaning a distributor plate in a fluidized bed polymerization reactor system according to one embodiment includes, in a first mode, operating with about a normal, baseline value of superficial gas velocity in a fluidized bed polymerization reactor system having a reactor vessel, a recycle line, and a distributor plate in the reactor vessel near an inlet of the reactor vessel. In a second mode, the superficial gas velocity is increased above the baseline value of the first mode to a level sufficient to raise the temperature of the cycle gas at the inlet above an average temperature of the cycle gas at the inlet in the first mode, and to a level sufficient to dislodge foulant from holes in the distributor plate.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: February 19, 2013
    Assignee: Univation Technologies, LLC
    Inventors: Eric J. Markel, Robert O. Hagerty, Ryan W. Impelman, Richard B. Pannell, Cecile F. Saladino
  • Patent number: 8372924
    Abstract: Described herein in one embodiment is a plant for the continuous solution polymerization of one or more monomers in a solvent, e.g., a hydrocarbon solvent. In one aspect, the plant comprises a high pressure pump and at least one heat exchanger downstream of the pump. In another aspect a feed is cooled by three heat exchangers which are refrigerated by means of a common three stage compressor. In another aspect, the plant comprises a primary reactor and a secondary reactor arranged to operate in parallel, in which the ratio of volume of the primary reactor to the secondary reactor is in the range of 60:40 to 95:5. In another aspect, a method of defouling a heat exchanger is provided in which the level of liquid refrigerant in the heat exchanger is temporarily lowered.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: February 12, 2013
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Richard Cheng-Ming Yeh, Bruce C. Devoy, Vetkav R. Eswaran, Rui Zhao
  • Patent number: 8338548
    Abstract: A process for the gas-phase polymerization of one or more alpha-olefins in the presence of a polymerization catalyst, the process comprising: at least a polymerization step wherein the polymer particles flow downward in densified form under the action of gravity so as to form a densified polymer bed; metering an anti-fouling agent in said polymerization step by means of at least N feeding lines placed at different heights of said densified polymer bed, N being the integer number satisfying the equation N?(1+0.08·H), where H is the height (expressed in meters) of the polymer bed.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: December 25, 2012
    Assignee: Basell Poliolefine Italia s.r.l.
    Inventors: Antonio Mazzucco, Tiziana Caputo, Riccardo Rinaldi
  • Patent number: 8293853
    Abstract: A method and apparatus are disclosed for controlling product discharge from a fluidized bed reactor and for minimizing the loss of the unreacted monomer in the fluidizing gas upon removing the solid polymer product from the reactor. The method and apparatus utilize at least one detector in the product tank or its vent line and a control system in communication with the detector and the product tank fill valve, along with certain algorithms, to adjust by an iterative process, the product discharge time, thereby maximizing resin fill in the product tank and minimizing the lost reactor gas volume.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 23, 2012
    Assignee: Univation Technologies, LLC
    Inventors: John R. Parrish, Jeffrey B. Drabish, Oscar M. Longoria, Jr., James L. Swecker, II
  • Publication number: 20120172549
    Abstract: A process for the gas-phase polymerization of one or more alpha-olefins in the presence of a polymerization catalyst, the process comprising: at least a polymerization step wherein the polymer particles flow downward in densified form under the action of gravity so as to form a densified polymer bed; metering an anti-fouling agent in said polymerization step by means of at least N feeding lines placed at different heights of said densified polymer bed, N being the integer number satisfying the equation N?(1+0.08·H), where H is the height (expressed in meters) of the polymer bed.
    Type: Application
    Filed: August 27, 2010
    Publication date: July 5, 2012
    Applicant: BASELL POLIOLEFINE ITALIA S.R.L.
    Inventors: Antonio Mazzucco, Tiziana Caputo, Riccardo Rinaldi
  • Patent number: 8198398
    Abstract: The invention relates to a process for removing fouling on a surface, wherein the surface is contacted with an aqueous solution of a guanidine of formula R1R2N—C(?NH)—NR3R4??(I) wherein R1, R2, R3 and R4 may be the same or different and each of R1, R2, R3 and R4 is hydrogen or hydrocarbyl.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: June 12, 2012
    Assignee: Shell Oil Company
    Inventors: Marco Antonius Denneman, Willem Karzijn
  • Patent number: 8129482
    Abstract: A process for preventing or reducing polymer agglomeration and/or accumulation on or around the gas distribution grid in an olefin polymerization, fluidized-bed reactor. The process involves introducing one or more scouring balls into the reactor above the gas distribution grid, and carrying out olefin polymerization in the presence of the scouring balls. Also disclosed is a process for polymerizing olefins in a fluidized-bed reactor with reduced polymer agglomeration and/or accumulation on the gas distribution grid.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: March 6, 2012
    Assignee: Westlake Longview Corporation
    Inventor: Larry Allen Noble
  • Patent number: 8124697
    Abstract: A method for preventing or reducing agglomeration and/or accumulation on or around the gas distribution grid in a fluidized-bed vessel. The method involves introducing one or more scouring balls into the vessel above the gas distribution grid, and carrying out a fluidized-bed process in the presence of the scouring balls.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: February 28, 2012
    Assignee: Westlake Longview Corporation
    Inventor: Larry Allen Noble
  • Publication number: 20120046426
    Abstract: The invention concerns methods for polymerization of olefins comprising contacting one or more monomers selected from ethylene and ?-olefins with a supported single site catalyst in the presence of one or more magnesium alkyl compounds wherein said magnesium alkyl is present during the major portion of said polymerization.
    Type: Application
    Filed: April 27, 2010
    Publication date: February 23, 2012
    Inventor: Xinggao Fang
  • Patent number: 8058369
    Abstract: The present invention relates to a bubble column reactor comprising a column reactor having a sparger plate dividing the column reactor into a top reaction compartment and a bottom compartment, characterized in that an inlet and outlet line for introducing and disposing a flushing medium are connected to the bottom compartment; and an operation method thereof.
    Type: Grant
    Filed: September 6, 2006
    Date of Patent: November 15, 2011
    Assignees: Saudi Basic Industries Corporation, Linde AG
    Inventors: Richard Schneider, Peter M. Fritz, Sebastian Muschelknautz, Heinz Bölt, Talal Ali, Fuad Mosa
  • Patent number: 8039562
    Abstract: In some embodiments, a method in which at least one continuity additive (“CA”) and a seed bed are pre-loaded into a reactor, and a polymerization reaction is optionally then performed in the reactor. In other embodiments, at least one flow improver, at least one CA, and a seed bed are pre-loaded into a reactor. Pre-loading of a reactor with a CA can significantly improve continuity of a subsequent polymerization reaction in the reactor during its initial stages, including by reducing sheeting and fouling. The CA can be pre-loaded in dry form (e.g., as a powder), or in liquid or slurry form (e.g., as an oil slurry). To aid delivery of a dry CA to the reactor and combination of the dry CA with a seed bed in the reactor, the dry CA can be combined with a flow improver and the combination of CA and flow improver then loaded into the reactor.
    Type: Grant
    Filed: January 29, 2009
    Date of Patent: October 18, 2011
    Assignee: Univation Technologies, LLC
    Inventors: Richard B. Pannell, Eric J. Markel, Agapios K. Agapiou
  • Patent number: 8017703
    Abstract: Continuous feed of auxiliaries for the polymerization reaction of ethylene, propene, and other higher homologous olefins in the preparation of homo- and copolymers, avoiding production of inhomogeneities, such as lumps or chunks which are present because the condition of the auxiliaries is not suitable for precise metering, becomes possible when auxiliaries in paste or solid form, in particular antistatic auxiliaries, are subjected, prior to feed, to a heat treatment in the presence of a solvent at a temperature of from 20 to 80° C., and then recooled, and then fed to the polymerization reaction.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: September 13, 2011
    Assignee: Basell Polyolefine GmbH
    Inventors: Jürgen Schwind, Horst Klassen, Gerald Lutz, Robert Gelinas, Klaus Berhalter, Ursula Krügers
  • Publication number: 20110196112
    Abstract: A method for cleaning a distributor plate in a fluidized bed polymerization reactor system according to one embodiment includes, in a first mode, operating with about a normal, baseline value of superficial gas velocity in a fluidized bed polymerization reactor system having a reactor vessel, a recycle line, and a distributor plate in the reactor vessel near an inlet of the reactor vessel. In a second mode, the superficial gas velocity is increased above the baseline value of the first mode to a level sufficient to raise the temperature of the cycle gas at the inlet above an average temperature of the cycle gas at the inlet in the first mode, and to a level sufficient to dislodge foulant from holes in the distributor plate.
    Type: Application
    Filed: July 23, 2009
    Publication date: August 11, 2011
    Applicant: UNIVATION TECHNOLOGIES, LLC
    Inventors: Eric J. Markel, Robert O. Hagerty, Ryan W. Impelman, Richard B. Pannell, Cecile F. Saladino
  • Patent number: 7985811
    Abstract: Embodiments of the present invention relate to measuring and controlling static in a gas phase reactor polymerization. In particular, embodiments relate to monitoring carryover static in an entrainment zone during gas phase polymerization to determine the onset of reactor discontinuity events such as chunking and sheeting. Embodiments also relate to monitoring carryover static to determine the need for effective additions of continuity additives that minimize reactor static activity and thereby preventing discontinuity events.
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: July 26, 2011
    Assignee: Univation Technologies, LLC
    Inventors: Robert O. Hagerty, Michael E. Muhle, Agapios K. Agapiou, Chi-I Kuo, Mark G. Goode, F. David Hussein, Richard B. Pannell, John F. Szul
  • Publication number: 20110172375
    Abstract: Described herein in one embodiment is a plant for the continuous solution polymerization of one or more monomers in a solvent, e.g., a hydrocarbon solvent. In one aspect, the plant comprises a high pressure pump and at least one heat exchanger downstream of the pump. In another aspect a feed is cooled by three heat exchangers which are refrigerated by means of a common three stage compressor. In another aspect, the plant comprises a primary reactor and a secondary reactor arranged to operate in parallel, in which the ratio of volume of the primary reactor to the secondary reactor is in the range of 60:40 to 95:5. In another aspect, a method of defouling a heat exchanger is provided in which the level of liquid refrigerant in the heat exchanger is temporarily lowered.
    Type: Application
    Filed: December 17, 2010
    Publication date: July 14, 2011
    Inventors: Richard Cheng-Ming Yeh, Bruce C. Devoy, Vetkav R. Eswaran, Rui Zhao
  • Publication number: 20110172376
    Abstract: The present invention is directed to a process for the production of an alpha-olefin polymer, which process comprises feeding of at least one alpha-olefin to a mechanically stirred bed gas phase reactor containing particles of the alpha-olefin polymer and polymerizing the alpha-olefin in the presence of a catalyst based on a titanium compound and a magnesium compound, an aluminum-alkyl compound and optionally an organosilane donor, in which process an amount of less than 100 ppm of at least one compound selected from the group of ethoxylated amines, fatty acid esters, diethanol amides, ethoxylated alcohols, alkylsulfonates and alkylphosphates is present during the polymerization.
    Type: Application
    Filed: June 26, 2009
    Publication date: July 14, 2011
    Inventors: Dan Munteanu, Geerlig Willem Wijsman, Roger Ceustermans
  • Patent number: 7956137
    Abstract: A polymerisation reactor comprising one or more circulation loops with one or more inlets for raw material, one or more outlets, and a circulation pump for circulating a reactor charge within the circulation loop. A by-pass line for by-passing the circulation pump connects a point of the loop upstream of the pump with a point downstream of the pump, both points being provided with a three way valve.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: June 7, 2011
    Assignee: Celanese International Corporation
    Inventor: David Charles Adams
  • Patent number: 7919568
    Abstract: The current invention provides a method of improving the efficiency of one or more heat exchangers used in cooperation with a high temperature solution polymerization process. Addition of surface active agents, such as C6 to C22 carboxylic acids, to a two phase liquid-liquid polymer solution downstream of a reactor system and upstream of a heat exchanger system can increase the efficiency of heat exchange by more than 10%.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: April 5, 2011
    Assignee: NOVA Chemicals (International) S.A.
    Inventors: Eric Cheluget, Arun Sood
  • Patent number: 7858736
    Abstract: This invention relates to a process comprising contacting an polymerization reactor effluent with a fluorinated hydrocarbon and thereafter recovering olefin polymer, where the fluorinated hydrocarbon is present at 5 volume % to 99 volume % based upon the volume of the effluent and the fluorinated hydrocarbon, and where the polymerization is a continuous polymerization of at least 75 mole % of hydrocarbon monomers, based upon the total moles of monomer present in the reactor.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: December 28, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Peijun Jiang, Robert Olds Hagerty, John Richard Shutt, Charles Stanley Speed, Randall B. Laird, Kevin B. Stavens, Larry L. Iaccino
  • Publication number: 20100317812
    Abstract: Provided herein is a method for operating a slurry polymerization reaction system to reduce, inhibit, and/or prevent fouling in the polymer recovery and separation apparatus, including one or more portions of a high pressure flash tank. The method generally comprises polymerizing a monomer feed in a slurry polymerization reactor in the presence of catalyst and diluent to produce a polymerization effluent; continuously discharging at least a portion of said polymerization effluent from the reactor through a discharge valve; combining a catalyst poison stream with the polymerization effluent downstream of said discharge valve, wherein the catalyst poison stream comprises a catalyst poison that is a gas at standard conditions; and flashing the combination of polymerization effluent and catalyst poison stream in a first flash tank.
    Type: Application
    Filed: June 11, 2009
    Publication date: December 16, 2010
    Inventor: Thomas W. Towles
  • Patent number: 7838607
    Abstract: Process for preparing an antistatic for olefin polymerization by contacting an antistatically acting compound comprising at least one hydrogen atom bound to a nonmetallic heteroatom with at least one metal alkyl in an amount which is sufficient to react completely with the at least one hydrogen atom bound to a heteroatom, wherein the antistatically acting compound and the metal alkyl are each present in a concentration of at least 0.01% by weight during contacting.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: November 23, 2010
    Assignee: Basell Polyolefine GmbH
    Inventor: Shahram Mihan
  • Patent number: 7834137
    Abstract: Provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier by using a weakly basic anion-exchange resin to adsorb and remove a fluorinated emulsifier with excellent efficiency from an aqueous fluorinated polymer dispersion. Also provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier, wherein the process includes: adding an organic carboxylic acid represented by the following formula (1): Q(CH2)m(CH(OH))nCOOH??(1) wherein Q is H, CH3 or COOH, m and n each independently represent 0 or an integer of from 1 to 4, and 4?n+m?1, to an aqueous fluorinated polymer dispersion containing a fluorinated emulsifier; and then contacting with a weakly basic anion-exchange resin to adsorb and remove the fluorinated emulsifier.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: November 16, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Shinya Higuchi, Jun Hoshikawa, Hiroki Kamiya, Yasuhiko Matsuoka, Hiroki Nagai
  • Publication number: 20100280196
    Abstract: A method of producing a prepolymerized catalyst for olefin polymerization comprising a fine powder removal step of removing fine particles from olefin-prepolymerized catalyst particles for olefin polymerization. The prepolymerized catalyst having a low fine particle content is applicable suitably to the field of continuous polymerization of olefins.
    Type: Application
    Filed: February 25, 2010
    Publication date: November 4, 2010
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Tomoaki Goto, Yoshimitsu Onodera
  • Patent number: 7812103
    Abstract: The present invention relates to a method for reducing/suppressing sheeting or agglomerates during polymerization of olefins, especially during the fluidized bed gas phase polymerization of olefins. In particular, the present invention relates to a method for reducing/suppressing sheeting or agglomerates during the product grade transition and/or catalyst transitions occurring polymerization of olefins.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: October 12, 2010
    Assignee: Ineos Europe Limited
    Inventors: Jean-Richard Llinas, Jean-Loic Selo
  • Patent number: 7808227
    Abstract: The present invention is directed to various methods and systems for detecting at least one impurity in a bulk fluid. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as a gas-phase reactor system.
    Type: Grant
    Filed: June 25, 2007
    Date of Patent: October 5, 2010
    Assignee: Univation Technologies, LLC
    Inventors: Eric J. Markel, Robert O. Hagerty, Michael E. Muhle
  • Patent number: 7799876
    Abstract: A method for controlling sheeting in a gas phase reactor that includes producing a polyolefin with at least one metallocene catalyst and at least one static control agent in at least one gas phase reactor, measuring entrainment static using a static probe, and adjusting the concentration of the static control agent in response to changes in the measured entrainment static is disclosed.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: September 21, 2010
    Assignee: Univation Technologies, LLC
    Inventors: Eric J. Markel, Robert O. Hagerty, F. David Hussein, Michael E. Muhle, Richard B. Pannell
  • Patent number: 7795359
    Abstract: The invention provides a continuous-flow process for producing a polymeric material. The process of the invention comprises the steps of: introducing at least two solutions, each comprising one or more reactants, into a microreactor to mix the two solutions to form a reacting solution, wherein the one or more reactants are selected from the group consisting of a monomer, an initiator, a coupling agent, a prepolymer, a macromer, and mixtures thereof; feeding continuously the reacting solution into a flow-through polymerization reactor in a coil form, wherein the flow-through polymerization reactor is capable of providing a residence time sufficient for (co)polymerizing the reactants to form a polymer with a desired polydispersity, wherein the flow-through polymerization reactor is immersed in an ultrasonic bath to minimize or substantially eliminate unwanted high-molecular-weight fractions of the polymer.
    Type: Grant
    Filed: March 1, 2006
    Date of Patent: September 14, 2010
    Assignee: Novartis AG
    Inventors: Brian Gerrard Devlin, Troy V. Holland, Dawn Alison Smith, Alexander Azzawi