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WO2006063575A1 - Procede et dispositif de separation de melanges polymeres - Google Patents

Procede et dispositif de separation de melanges polymeres Download PDF

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Publication number
WO2006063575A1
WO2006063575A1 PCT/DE2005/002261 DE2005002261W WO2006063575A1 WO 2006063575 A1 WO2006063575 A1 WO 2006063575A1 DE 2005002261 W DE2005002261 W DE 2005002261W WO 2006063575 A1 WO2006063575 A1 WO 2006063575A1
Authority
WO
WIPO (PCT)
Prior art keywords
separation chamber
shape
polymer
shear gap
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2005/002261
Other languages
German (de)
English (en)
Inventor
Reinhard KÄRMER
Hans-Jürgen SCHULLA
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.)
ESA Patentverwertungsagentur Sachsen Anhalt GmbH
Original Assignee
ESA Patentverwertungsagentur Sachsen Anhalt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ESA Patentverwertungsagentur Sachsen Anhalt GmbH filed Critical ESA Patentverwertungsagentur Sachsen Anhalt GmbH
Priority to EP05850156A priority Critical patent/EP1830990A1/fr
Publication of WO2006063575A1 publication Critical patent/WO2006063575A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/005—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion by thermal diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/04—Breaking emulsions
    • B01D17/048—Breaking emulsions by changing the state of aggregation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0203—Separating plastics from plastics
    • 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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0255—Specific separating techniques using different melting or softening temperatures of the materials to be separated
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the invention relates to a method for separating polymer mixtures and to an apparatus for carrying out the method.
  • the polymer mixtures to be separated are mixtures of material-like components which differ in the structure of the polymer chains, such as, for example, polyolefins.
  • DE 36 01 175 A1 introduces a separation process in which a polymer mixture is heated in a high-speed mixer until plasticization and agglomeration of the polymer particles having the lowest melting point and then fed to a cooling mixer. Cooled dissolved polymer parts are subsequently separated in a separator in agglomerates and non-deformable particles. With this method, the separation of a plastic mixture is possible only at different melting points of the components. It However, it has been found that by means of the known processes separate polymer mixtures are not sufficiently homogeneous for a number of applications.
  • the invention is therefore based on the object to develop a method for separating polymer mixtures from materially similar components with approximately the same density and approximately the same melting points.
  • the object is to provide a device suitable for carrying out the method.
  • the essence of the invention is to use viscoelastic properties of the components of the polymer mixtures for the desired separation and removal:
  • a polymer mixture to be separated in the molten or plasticized state is exposed in a shear gap to shear with annular flow paths of different diameters.
  • Different viscoelastic tensile stresses build up in the various components of the polymer mixture, which can lead to different local accumulations of the components in the shear gap.
  • the inventive method can be carried out in an advantageous manner so that the annular current paths through a arranged in a separation chamber above rotationally symmetric Knetrotor example in a Ke- gel form or in a round plate shape in conjunction with one of the respective shape for the shear gap adapted inner wall of the separation chamber can be generated.
  • a Knirtotor in conical shape different designs are possible. For example, it is possible to provide an inwardly curved or an outwardly curved conical shape. In the same way, there is a possibility of the design with a stepped or paragraphed conical shape of a Knetrotors.
  • the throughput or the metering rate for the polymer mixture can be regulated.
  • the device according to the invention consists of a separation chamber, preferably with a hollow cone-shaped inner wall, which is controllably heated.
  • the kneading rotor has the outer shape of a cone and thus forms a shear gap with the hollow cone shape of the inner wall of the separation chamber.
  • a polymer mixture to be separated is previously melted or plasticized in a plasticizer, for example an extruder, in order to then feed it to the shearing gap.
  • the rotation of the Knetrotors causes in the adhering polymers ring formations. These rings generate viscoelastic tensile stresses.
  • the kneading rotor is designed so that its conical shape is mounted on a machine element rotatably mounted on the cone tip and below the cone base preferably in rolling bearings.
  • the Knetrotor is designed below the cone base so that a torque can be transmitted to him by a drive.
  • the separation chamber housing consists of two outer shapes and a central shape.
  • the middle mold channels are arranged, which are designed outside the separation chamber for the flow of polymer masses controllable.
  • a first discharge channel is preferably at the level of the conical rotor tip and a second discharge channel is preferably arranged at the level of the conical base surface of the kneading rotor.
  • the bearings for the bearing of the rotor are fitted centrally.
  • the quality of the separation process is influenced by the throughput of the polymer mass per unit time and by the temperature.
  • a decisive influencing factor is the residence time of the polymer mass in the separation chamber.
  • a longer residence time ensures a better separation, but enhances the structural destruction in the shear gap.
  • Dwell times can be influenced with the throughput and can be adjusted by its control. Realizable solutions have been found with the inventions with surprisingly simple technology in order to separate polymer mixtures from material-like components into polymer fractions having different properties, such as polyethylenes, polypropylenes, etc., in continuous operation.
  • the process can be run several times to increase the purity.
  • a use of the separation process for separating substances without viscoelastic properties such as air inclusions, color pigments, etc. from polymer mixtures having at least one viscoelastic component proceeds in an analogous manner.
  • Fig. 1 the sectional view of the separation device according to the invention
  • Fig. 2 the overall view of a separation plant with inventive
  • Separating device and Fig. 3 the side view of a separation plant.
  • the device according to the invention is gem.
  • a rotatably mounted Knetrotor 2 is arranged, which is designed with its outer cone shape so that it forms a Scherspait 3 with a gap width of 2.5 mm with the hollow cone shape of the inner wall of the separation chamber.
  • a separation chamber 1 according to the invention was used with a Knetrotor 2 with the following dimensions:
  • HDPE type "Lacqtene”, manufacturer: Atofina
  • LDPE type “Montell”, manufacturer: Atofina
  • melt index MFI value according to DIN / ISO 11373
  • HDPE / LDPE MFI 5/190 1.255 g / 10 min.
  • the polymer mixture was prepared by the following technology:
  • the polymer mixture to be separated is HDPE / LDPE having the MFI value of 1.255 g / 10 min.
  • a plasticizer e.g. an extruder 9 with geared motor 10
  • molten or plasticized to supply it to the shear gap 3.
  • the rotation of the Knetrotors 2 causes ring formations in the adhering polymers. These rings create viscoelastic tensile stresses.
  • the kneading rotor 2 is designed so that its conical shape is mounted on a machine element rotatably mounted on the Knetrotorspitze 6 and below the cone base 7, preferably in rolling bearings 8.
  • the machine element is designed extended below the cone base 7 in order to transmit a torque by a drive 10.
  • the separation chamber 1 consists of two DTformen and a central shape, which form a common housing. In the middle form channels are arranged, which are designed outside the separation chamber 1 for the flow of polymer masses controllable.
  • a feed channel 4 for introducing the polymer mixture HDPE / LDPE with the MFI value 1, 255 g / 10 min in the shear gap 3 and at least two discharge channels 5, which derive the polymer fractions from the separation chamber 1, is present.
  • a first discharge channel 5 is approximately at the level of the conical knector rotor tip 6, and a second discharge channel 5 is arranged approximately at the level of the conical base surface 7 of the kneading rotor 2.
  • the throughput is about 4 to 8 g / min.
  • the segregation ratio is 1: 1.
  • the rolling bearings 8 are fitted centrally for the storage of Knetrotors 2.
  • HDPE / PP MFI 2,16 / 230 1, 03 g / 10 min.
  • the polymer mixture was prepared by the following procedure:
  • the MFI values measured as a measure of the structuring differ, depending on the process parameters realized, at least fourfold in the case of the polymer fractions from the polymer mixture HDPE / PP.
  • the general increase in MFI values observed in addition can be attributed to the structure destruction in shearing gap 3, which can be influenced by the throughput.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Procédé de séparation de mélanges polymères et dispositif permettant la mise en oeuvre dudit procédé. La présente invention peut être utilisée pour la séparation de mélanges polymères lors du traitement de matières thermoplastiques. Selon ledit procédé, un mélange polymère à séparer est fondu ou plus précisément plastifié et soumis dans une fente à un cisaillement à l'aide de voies de flux de diamètres différents, des fractions du mélange polymère étant évacuées de la fente de cisaillement en au moins deux points qui sont touchés par les voies de flux annulaires de diamètre différent. Le dispositif est constitué d'une chambre de séparation (1) à paroi interne conique dans le milieu de laquelle un rotor pétrisseur (2) possédant une forme externe conique est monté rotatif et forme avec la paroi interne de la chambre de séparation une fente de cisaillement (3), ledit dispositif étant équipé d'un conduit d'amenée (4) et d'au moins deux conduits d'évacuation (5).
PCT/DE2005/002261 2004-12-18 2005-12-15 Procede et dispositif de separation de melanges polymeres Ceased WO2006063575A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05850156A EP1830990A1 (fr) 2004-12-18 2005-12-15 Procede et dispositif de separation de melanges polymeres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410061042 DE102004061042A1 (de) 2004-12-18 2004-12-18 Verfahren und Vorrichtung zum Trennen von Polymergemischen
DE102004061042.8 2004-12-18

Publications (1)

Publication Number Publication Date
WO2006063575A1 true WO2006063575A1 (fr) 2006-06-22

Family

ID=36118056

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2005/002261 Ceased WO2006063575A1 (fr) 2004-12-18 2005-12-15 Procede et dispositif de separation de melanges polymeres

Country Status (3)

Country Link
EP (1) EP1830990A1 (fr)
DE (1) DE102004061042A1 (fr)
WO (1) WO2006063575A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905448A (en) * 1954-10-06 1959-09-22 Pure Oil Co Apparatus for preparing colloidal dispersions
US3514079A (en) * 1968-01-04 1970-05-26 Waukesha Foundry Co Food emulsifying mill
WO1987006496A1 (fr) * 1986-04-25 1987-11-05 Bernard Alzner Dispositif de melange
US4717669A (en) * 1986-08-18 1988-01-05 Vaclav Feres Centrifugal film fermenter
DE4314020A1 (de) * 1993-04-29 1994-11-03 Rolf Dipl Ing Schnause Verfahren und Vorrichtung zum kontinuierlichen Reinigen und Entgasen viskoser Kunststoffschmelzen
US5813758A (en) * 1993-12-10 1998-09-29 Ahlstrom Machinery Inc. Concentric ring fluidizing mixer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2127454T3 (es) * 1994-11-08 1999-04-16 Basf Corp Metodo para separar polimeros de mezclas de los mismos.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905448A (en) * 1954-10-06 1959-09-22 Pure Oil Co Apparatus for preparing colloidal dispersions
US3514079A (en) * 1968-01-04 1970-05-26 Waukesha Foundry Co Food emulsifying mill
WO1987006496A1 (fr) * 1986-04-25 1987-11-05 Bernard Alzner Dispositif de melange
US4717669A (en) * 1986-08-18 1988-01-05 Vaclav Feres Centrifugal film fermenter
DE4314020A1 (de) * 1993-04-29 1994-11-03 Rolf Dipl Ing Schnause Verfahren und Vorrichtung zum kontinuierlichen Reinigen und Entgasen viskoser Kunststoffschmelzen
US5813758A (en) * 1993-12-10 1998-09-29 Ahlstrom Machinery Inc. Concentric ring fluidizing mixer

Also Published As

Publication number Publication date
DE102004061042A1 (de) 2006-06-29
EP1830990A1 (fr) 2007-09-12

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