US20090018285A1 - Method for Thermally Treating Polyester Pellets to Obtain a Partial Crystallization - Google Patents

Method for Thermally Treating Polyester Pellets to Obtain a Partial Crystallization Download PDF

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Publication number
US20090018285A1
US20090018285A1 US11/915,976 US91597606A US2009018285A1 US 20090018285 A1 US20090018285 A1 US 20090018285A1 US 91597606 A US91597606 A US 91597606A US 2009018285 A1 US2009018285 A1 US 2009018285A1
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United States
Prior art keywords
granulates
reactor
crystallization
degrees
heat
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Abandoned
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US11/915,976
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English (en)
Inventor
Theodor Bruckmann
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.)
BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
Original Assignee
BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
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Filing date
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Application filed by BKG Bruckmann and Kreyenborg Granuliertechnik GmbH filed Critical BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
Assigned to BKG BRUCKMANN & KREYENBORG GRANULIERTECHNIK GMBH reassignment BKG BRUCKMANN & KREYENBORG GRANULIERTECHNIK GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRUCKMANN, THEODOR
Publication of US20090018285A1 publication Critical patent/US20090018285A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/021—Heat treatment of powders
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/80—Solid-state polycondensation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88—Post-polymerisation treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • B29B2009/165—Crystallizing granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0041—Crystalline

Definitions

  • the invention relates to a method of thermally treating polyester pellets, to obtain a partial crystallization according to the preamble of the main claim, and apparatus for achieving same in accordance with the preamble of claim 3 .
  • Aromatic polyesters or co-polyesters are the base material for products such as foils, packaging, as well as barrels or containers. All of these polyesters and co-polyesters shall be designated generally as “polyesters” in the description of the present invention.
  • a conventional method for thermally treating polyester pellets is disclosed in the subsequently published Application Publication WO 2005/044901 A1 (BKG).
  • This method teaches very quickly removing water from the pellets that have just been produced, for example, in an “underwater heat-rejection granulation system,” by using the intrinsic heat of the pellets for drying and crystallization.
  • the pellets are transported over a vibrating conveyor immediately after the water is removed, in order to prevent the pellets from sticking to each other and, after sufficient dwell time, delivered to a filling station or a solid-phase poly condensator.
  • the crystallization process occurs from the inside to the outside of the pellet, which achieves a more even crystallization across the diameter of the pellet or granulate.
  • this method achieves crystallization exclusively by using the intrinsic heat generated in the liquid state of the polymer. This means that no externally supplied heat is applied to the pellets between granulation and the subsequent filling station or post-processing station. This distinguishes the method according to WO 2005/044901 A1 basically from conventional methods.
  • a method of manufacturing polyethylene terephthalate granulates is described in the publication GB 1 250 690 A.
  • the base material is produced as in the conventional liquid condensation and delivered to an underwater granulator as an approximately 280 degree C. hot polyester liquid.
  • the strand of hot synthetic material that is extruded through the jet is captured and cooled by a water spray coming out of a ring jet.
  • This strand is then delivered through an underwater cooling distance to a cutting device.
  • the granulate material traverses a sieve, by means of which water is separated from solid material.
  • the water is pumped across a cooler in a closed circuit.
  • the wet granulate material after being dried, can be used for thermal post-condensation.
  • This granulate material particularly when treated in a thermal post-condensation at greater than 200 degree C., is suitable in its solid state for injection molding.
  • U.S. Pat. No. 5,540,868 teaches how to produce crystallized pellets from amorphous polyester, using various granulating methods.
  • the amorphous polyester pre-product has to be heated to temperatures greater than 70 degrees C., in order to initiate the crystallization process.
  • Amorphous polyester however, has a disadvantage in that, when heated to temperatures greater than 70 degrees C., its surface becomes sticky.
  • the pre-product In order to prevent the amorphous polyester from sticking or forming clumps at crystallization temperatures of greater than 70 degrees C., the pre-product has to be in the form of granulates, which can then be held in motion in a fluidized bed reactor by means of streams of hot gas, at least until the surface has crystallized out enough, so that the pre-product granulates do not stick to each other.
  • Amorphous polyester is transparent; the crystalline phase, however, clearly shows a white coloration.
  • the crystallization process of the pre-product is combined with the additional reinforced poly condensation, which is typically carried out at temperatures between 200 and 230 degrees C. in a fluidized bed reactor. This is done to overcome the stickiness of the amorphous polyester.
  • the reactor is operated first at an optimal crystallization temperature of approximately 150 degrees C. for several hours, to overcome the stickiness. Subsequently, the pellets or granulates are condensed over additional hours to higher chain lengths at temperatures between 200 and 230 degrees C.
  • the granulate material is not transported through the heat-insulating container, but rather, stored in the container, with the hope that this storage will lead to crystallization of the granulates, without the granulates baking and sticking to each other. Furthermore, the granulates are to be held in a heat-retaining condition, that is, they are to not cool down or heat up.
  • An object of the invention of the present application is to improve the conventional method, according to which partial crystallization is achieved by the intrinsic heat of the pellets from inside to the outside, so that once again a further simplification of the process is achieved.
  • the inventor suggests constructing the treatment apparatus, which is defined in the WIPO Publication WO 2005/0044901 A1 as motion equipment, as a crystallization reactor that is oriented at least slightly inclined or vertical.
  • the pellets having a temperature of greater than 100 degrees C., are loaded into the reactor, pass through this reactor from the loading point to delivery point, and exit this crystallization area having a temperature greater than 130 degrees C.
  • “Slightly inclined” means, that the reactor does not stand or lie horizontally, but rather, has an incline relative the horizontal of up to 90 degrees.
  • the dwell time of the granulates in the reactor lies between greater than one minute and, preferably, eight minutes.
  • the partially crystallized granulates are then delivered to downstream treatment or handling apparatus, for example, to a solid-phase poly condensator, a silo, etc.
  • the invention relates to apparatus for carrying out the method.
  • the apparatus comprises a crystallization reactor tube, through which the pellets, based on their own weight, flow from the loading point to the delivery point.
  • the reactor tube is operable with or without baffles.
  • the baffles have the effect of guiding the granulates and thereby resulting in a blending or homogenization of the crystallization process.
  • a rotating paddle-bearing shaft may be provided within the reactor, which effects a thorough mixing of the pellets.
  • the reactor is heat-insulated and the granulates are transported between the exit end of the reactor and the connecting downstream post-processing apparatus or a silo, for example, by means of a blower that is incorporated into the conveyor tube.
  • the granulates pass through the reactor densely packed, that is, the volume of granulate material taken from the bottom is continuously being replaced from above. Furthermore, the volume of the granulate material being removed is also adjustable.
  • FIG. 1 designates with 1 a melting pump and a sieve exchanger. Polyester is fed to the receiving apparatus 1 , as indicated by arrow F 1 .
  • An underwater heat-rejection granulator 2 is provided at the exit of the sieve exchanger, where bead-shaped or lentil-shaped granulates are formed.
  • These granulates are delivered by means of process water via a conveyor tube to a water-solids separator 3 , such as, for example, a centrifuge. The granulates then leave the water-solids separator 3 by means of a conveyor tube 4 , the granulates having a temperature greater than 100 degrees C.
  • the granulates are delivered to a crystallization reactor 5 , which is shown in the illustrated embodiment as a vertically oriented reactor.
  • a reactor that is at least slightly inclined may also be provided in a similar manner.
  • the granulates pass through the reactor 5 from the loading point or the loading end to the exit or discharge end.
  • a conveyor device 6 is provided at the discharge end, as shown in FIG. 1 .
  • the conveyor device 6 transports the granulates to a solid-phase poly condensator 8 by some means, such as, for example, a blower.
  • FIG. 2 also shows a vertically oriented crystallization reactor 5 A, which has a shaft 9 fitted with paddles 10 .
  • the shaft 9 is rotated by means of a drive motor 11 .
  • This reactor 5 A too, may also be set up with a slight incline.
  • the reactor 5 , 5 A is provided with heat insulation, although this is not absolutely necessary.
  • PW is temperature of the process water
  • GT is the temperature of the granulate material
  • VZ is the process time
  • the temperature of the granulate as it is delivered to the underwater heat-rejection granulator is greater than 230 degrees C.
  • the temperature of the process water in the conveyor tube between the granulator 2 and the water-solids separator 3 is greater than 80 degrees C.
  • the granulates leave the conveyor 4 with a temperature greater than 100 degrees C.
  • the process time of the granulates in the reactor 5 is greater than one minute and is, preferably, eight minutes.
  • the temperature of the granulates entering the reactor 5 is greater than 100 degrees C., and is higher than 130 degrees C. at the discharge end of the reactor 5 , without energy being supplied, in order to, for example, subsequently temper the granulates.
  • the temperature of the granulates when entering the solid-phase poly condensator 8 is also preferably greater than 130 degrees C.
  • These temperatures represent the surface temperature of the granulates.
  • the crystallization reactor 5 had a height of 1 m, an inner diameter of 270 mm, which narrowed to 100 mm at the discharge or delivery end. This exit opening may also be adjusted in size.
  • the reactor 5 stood vertically, that is, was vertically oriented.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Polyesters Or Polycarbonates (AREA)
US11/915,976 2005-06-01 2006-03-15 Method for Thermally Treating Polyester Pellets to Obtain a Partial Crystallization Abandoned US20090018285A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102005025111.0 2005-06-01
DE102005025111 2005-06-01
DE102005026354.2 2005-06-08
DE102005026354A DE102005026354A1 (de) 2005-06-01 2005-06-08 Verfahren zur thermischen Behandlung von Polyesterpellets, um eine Teilkristallisation zu erreichen
PCT/DE2006/000454 WO2006128408A1 (de) 2005-06-01 2006-03-15 Verfahren zur thermischen behandlung von polyesterpellets, um eine teilkristallisation zu erreichen

Publications (1)

Publication Number Publication Date
US20090018285A1 true US20090018285A1 (en) 2009-01-15

Family

ID=36821527

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/915,976 Abandoned US20090018285A1 (en) 2005-06-01 2006-03-15 Method for Thermally Treating Polyester Pellets to Obtain a Partial Crystallization
US13/092,621 Active US8304518B2 (en) 2005-06-01 2011-04-22 Method for thermally treating polyester pellets to obtain a partial crystallization

Family Applications After (1)

Application Number Title Priority Date Filing Date
US13/092,621 Active US8304518B2 (en) 2005-06-01 2011-04-22 Method for thermally treating polyester pellets to obtain a partial crystallization

Country Status (8)

Country Link
US (2) US20090018285A1 (de)
EP (1) EP1885772B1 (de)
CN (1) CN101228213B (de)
AT (1) ATE406404T1 (de)
DE (2) DE102005026354A1 (de)
PL (1) PL1885772T3 (de)
RU (1) RU2397993C2 (de)
WO (1) WO2006128408A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006058642A1 (de) * 2006-12-11 2008-06-12 Bühler AG Verfahren zur Herstellung homogen kristallisierter Polykondensatgranulate
RU2446944C2 (ru) * 2007-05-11 2012-04-10 Юоп Ллк Способ и аппарат для кристаллизации полимерных частиц
US9259857B2 (en) 2008-02-12 2016-02-16 Gala Industries, Inc. Method and apparatus to condition polymers utilizing multiple processing systems
US8080196B2 (en) 2008-02-12 2011-12-20 Gala Industries, Inc. Method and apparatus to achieve crystallization of polymers utilizing multiple processing systems
DE102012011641A1 (de) * 2012-06-12 2013-12-12 Automatik Plastics Machinery Gmbh Verfahren und Vorrichtung zurn Trocknen und Kristallisieren von Granulat
CN103496155A (zh) * 2013-10-11 2014-01-08 昆山市华浦塑业有限公司 一种塑料材料的制备方法
DE102014110337A1 (de) * 2014-07-22 2016-01-28 Technip Zimmer Gmbh Verfahren und Anlage zur Herstellung von PET-Granulat
RU2748939C1 (ru) 2016-06-21 2021-06-01 Юоп Ллк Способ и устройство для кристаллизации и повышения молекулярной массы полимерных частиц
US11298853B2 (en) 2016-06-21 2022-04-12 Uop Llc Processes and apparatuses for conditioning polymer particles for an SSP reactor
EP3650186B1 (de) 2018-11-08 2023-07-19 Polymetrix AG Verfahren und vorrichtung zur direktkristallisation von polykondensaten
EP3708936B1 (de) * 2019-03-15 2024-04-17 Polymetrix AG Verfahren zum recycling von polyolefinen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544525A (en) * 1968-03-26 1970-12-01 Allied Chem Process for crystallization,drying and solid-state polymerization of polyesters
US5558678A (en) * 1992-11-13 1996-09-24 Karl Fischer Industrieanlagen Gmbh Process and apparatus for continuous crystallization of plastic granules
US20050062186A1 (en) * 2001-10-29 2005-03-24 Markus Fellinger Method and device for increasing the limiting viscosty of polyester
US20050085620A1 (en) * 2003-10-17 2005-04-21 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Method and apparatus for thermally processing polyester pellets
US20050272906A1 (en) * 2002-08-09 2005-12-08 Guiliano Cavaglia Continuous process for solid phase polymerisation of polyesters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59208466D1 (de) * 1992-11-13 1997-06-12 Fischer Karl Ind Gmbh Verfahren und Vorrichtung zum kontinuierlichen Kristallisieren von Kunststoffgranulat
DE10349016B4 (de) * 2003-10-17 2005-10-20 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Verfahren zur Wärmebehandlung von Pellets aus PET

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544525A (en) * 1968-03-26 1970-12-01 Allied Chem Process for crystallization,drying and solid-state polymerization of polyesters
US5558678A (en) * 1992-11-13 1996-09-24 Karl Fischer Industrieanlagen Gmbh Process and apparatus for continuous crystallization of plastic granules
US20050062186A1 (en) * 2001-10-29 2005-03-24 Markus Fellinger Method and device for increasing the limiting viscosty of polyester
US20050272906A1 (en) * 2002-08-09 2005-12-08 Guiliano Cavaglia Continuous process for solid phase polymerisation of polyesters
US20050085620A1 (en) * 2003-10-17 2005-04-21 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Method and apparatus for thermally processing polyester pellets

Also Published As

Publication number Publication date
US8304518B2 (en) 2012-11-06
CN101228213B (zh) 2011-07-20
DE102005026354A1 (de) 2006-12-07
CN101228213A (zh) 2008-07-23
US20110201776A1 (en) 2011-08-18
ATE406404T1 (de) 2008-09-15
DE502006001456D1 (de) 2008-10-09
PL1885772T3 (pl) 2009-01-30
EP1885772B1 (de) 2008-08-27
RU2397993C2 (ru) 2010-08-27
RU2007148437A (ru) 2009-07-20
EP1885772A1 (de) 2008-02-13
WO2006128408A1 (de) 2006-12-07

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Legal Events

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AS Assignment

Owner name: BKG BRUCKMANN & KREYENBORG GRANULIERTECHNIK GMBH,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BRUCKMANN, THEODOR;REEL/FRAME:020268/0513

Effective date: 20071207

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION