EP1352023A1 - Method for processing contaminated polycondensate materials - Google Patents

Method for processing contaminated polycondensate materials

Info

Publication number
EP1352023A1
EP1352023A1 EP02732087A EP02732087A EP1352023A1 EP 1352023 A1 EP1352023 A1 EP 1352023A1 EP 02732087 A EP02732087 A EP 02732087A EP 02732087 A EP02732087 A EP 02732087A EP 1352023 A1 EP1352023 A1 EP 1352023A1
Authority
EP
European Patent Office
Prior art keywords
polycondensate
intrinsic viscosity
increased
surface layer
polycondensate material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02732087A
Other languages
German (de)
French (fr)
Inventor
Kurt Müntener
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.)
Richard Frisse GmbH
Original Assignee
Richard Frisse 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 Richard Frisse GmbH filed Critical Richard Frisse GmbH
Publication of EP1352023A1 publication Critical patent/EP1352023A1/en
Withdrawn legal-status Critical Current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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • 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
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0224—Screens, sieves
    • 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
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B2017/0424—Specific disintegrating techniques; devices therefor
    • B29B2017/046—Extruder as pressing tool with calibrated die openings for forming and disintegrating pasty or melted 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
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles
    • 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
    • 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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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 processing contaminated polycondensate material, e.g. Polyethylene terephthalate, e.g. is used for disposable or reusable bottles.
  • contaminated polycondensate material e.g. Polyethylene terephthalate
  • the invention relates to a method for processing contaminated polycondensate material, e.g. Polyethylene terephthalate, e.g. is used for disposable or reusable bottles.
  • Such a consumer product can e.g. consist of polycondensate, in particular of polyethylene terephthalate (PET), as e.g. is used for bottles. If solid particles get between any hard surface and a relatively soft surface of a PET bottle, they can penetrate into the surface of the relatively soft bottle wall or the bottle bottom due to the friction that occurs between the surfaces. These solid particles are then firmly enclosed in the surface of the bottle wall.
  • PET polyethylene terephthalate
  • a conventional washing method in which a washing liquid containing at least one detergent and kept in motion is not able to remove these enclosed particles from the surface of the PET bottles, which may have been reduced to snippets.
  • Numerous mechanical reprocessing processes aim to use used polycondensate material, such as PET bottles.
  • these methods include surface cleaning, melting, and forming steps to obtain a new product.
  • the particles cause material defects. It is known to remove the larger particles by melt filtration as part of the mechanical reprocessing process.
  • filter sizes are used that remove particles with a size of 60 micrometers or more.
  • Some particularly fine filters can remove particles 30 microns or larger.
  • the extremely small particles pass through these filters, and if they do not cause mechanical defects, they cause them also do not cause mechanical defects, they nevertheless cause optical defects which may not be acceptable for some bottle applications.
  • Melt filtration is therefore unsuitable for removing the extremely fine particles, in particular the solid particles.
  • the invention is therefore based on the object of providing a method in which even the extremely fine particles are removed from the polycondensate material to be processed, which particles cannot be removed economically by conventional melt filtration and while maintaining the quality of the polycondensate material.
  • the fine particles that are mainly trapped directly on and below the surface are removed from the material so that they no longer have to be removed by extremely fine filters.
  • the thickness of the removed surface layer of the polycondensate material corresponds to the maximum size of the enclosed particles to be removed. This can be explained by the fact that a solid particle is only exposed to an external frictional force by which it is pressed into the bottle wall until it has completely penetrated the wall. Since larger particles are removed by melt filtration, the surface removal only affects the enclosed solid particles, the size of which is smaller than the smallest filter opening.
  • the thickness of the surface layer removed before melting is approximately 15 to 30 micrometers. This corresponds to the smallest possible filter openings with which melt filtration in connection with the surface removal can be carried out without having to accept the inefficiency of the process and the impairment of the quality of the polycondensate material.
  • the number of visible defects could be reduced to less than 1 per 1000 m 2 .

Abstract

The invention relates to a method for processing contaminated polycondensate materials, especially polyethylene terephthalate (PET). The inventive method is characterized by removing a surface layer of the polycondensate material to be processed before the material is melted and filtered in the melt. Optionally, said method may be followed by a step for increasing the intrinsic viscosity by melt phase or solid phase polycondensation.

Description

Verfahren zum Aufbereiten von verunreinigtem Polykondensat-Material Process for processing contaminated polycondensate material
Die Erfindung bezieht sich auf ein Verfahren zum Aufbereiten von verunreinigtem Polykondensat-Material, wie z.B. Polyethylen-Terephthalat, das z.B. für Einweg- oder Mehrwegflaschen verwendet wird.The invention relates to a method for processing contaminated polycondensate material, e.g. Polyethylene terephthalate, e.g. is used for disposable or reusable bottles.
Während ihrer Lebensdauer kommen Verbrauchsprodukte oftmals mit feinen Feststoffteilchen in Berührung. Ein derartiges Verbrauchsprodukt kann z.B. aus Polykondensat, insbesondere aus Polyethylen-Terephthalat (PET) bestehen, wie es z.B. für Flaschen verwendet wird. Geraten nun Feststoffteilchen zwischen irgend eine harte Oberfläche und eine relativ weiche Oberfläche einer PET-Flasche, so können sie aufgrund der zwischen den Flächen stattfindenden Reibung in die Oberfläche der relativ weichen Flaschenwand oder des Flaschenbodens eindringen. Diese Feststoffteilchen werden dann in der Oberfläche der Flaschenwand fest eingeschlossen. Ein herkömmliches Waschverfahren, bei dem mit einer mindestens eine Detergenzie enthaltenden und in Bewegung gehaltenen Waschflüssigkeit gearbeitet wird, vermag diese eingeschlossenen Partikel nicht aus der Oberfläche der ggf. zu Schnipseln verkleinerten PET-Flaschen zu entfernen.During their lifespan, consumer products often come into contact with fine solid particles. Such a consumer product can e.g. consist of polycondensate, in particular of polyethylene terephthalate (PET), as e.g. is used for bottles. If solid particles get between any hard surface and a relatively soft surface of a PET bottle, they can penetrate into the surface of the relatively soft bottle wall or the bottle bottom due to the friction that occurs between the surfaces. These solid particles are then firmly enclosed in the surface of the bottle wall. A conventional washing method, in which a washing liquid containing at least one detergent and kept in motion is not able to remove these enclosed particles from the surface of the PET bottles, which may have been reduced to snippets.
Zahlreiche mechanische Wiederaufbereitungsverfahren zielen darauf ab, gebrauchtes Polykondensat-Material, wie z.B. PET-Flaschen zu verwenden. Üblicherweise enthalten diese Verfahren Schritte zur Oberflächenreinigung, zum Aufschmelzen und zur Umformung, um ein neues Produkt zu erhalten. Wenn man die Bereiche der Flaschenwand wiederverwendet, die eingeschlossene Teilchen enthalten, um neue Flaschen herzustellen, verursachen die Teilchen Fehler am Material. Es ist zwar bekannt, die grösseren Teilchen durch Schmelzfiltration im Rahmen des mechanischen Wiederaufbereitungsverfahrens zu entfernen. Dabei verwendet man üblicherweise Filtergrössen, die Teilchen einer Grosse von 60 Mikrometer oder darüber entfernen. Einige besonders feine Filter können Teilchen einer G.rösse von 30 Mikrometer oder darüber entfernen. Allerdings treten durch diese Filter die äusserst kleinen Teilchen hindurch, und wenn sie auch keine mechanischen Defekte bewirken, verursachen sie auch keine mechanischen Defekte bewirken, verursachen sie dennoch optische Defekte, die für einige Anwendungen der Flaschen nicht akzeptierbar sein könnten.Numerous mechanical reprocessing processes aim to use used polycondensate material, such as PET bottles. Typically, these methods include surface cleaning, melting, and forming steps to obtain a new product. When reusing areas of the bottle wall that contain trapped particles to make new bottles, the particles cause material defects. It is known to remove the larger particles by melt filtration as part of the mechanical reprocessing process. Usually filter sizes are used that remove particles with a size of 60 micrometers or more. Some particularly fine filters can remove particles 30 microns or larger. However, the extremely small particles pass through these filters, and if they do not cause mechanical defects, they cause them also do not cause mechanical defects, they nevertheless cause optical defects which may not be acceptable for some bottle applications.
Die Verwendung noch kleinerer Filter ist bei einem mechanischen Wiederaufberei- tungsverfahren nicht wünschenswert, da feinere Filter einen grösseren Staudruck bei einem Filter gegebener Grosse hervorrufen oder eine grössere Filterfläche benötigen, wodurch letztendlich die Verweilzeit in der Schmelze erhöht wird. Beides trägt zur Qualitätsminderung des Polykondensat-Materials bei, indem das Molekulargewicht verringert und eine Verfärbung des Polykondensats bewirkt werden.The use of even smaller filters is not desirable in a mechanical reprocessing process, since finer filters create a larger back pressure for a filter of a given size or require a larger filter area, which ultimately increases the residence time in the melt. Both contribute to a reduction in the quality of the polycondensate material by reducing the molecular weight and causing discoloration of the polycondensate.
Die Schmelzfiltration ist daher für die Entfernung der äusserst feinen Teilchen, insbesondere der Feststoffteilchen, ungeeignet.Melt filtration is therefore unsuitable for removing the extremely fine particles, in particular the solid particles.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren bereitzustellen, bei dem auch die äusserst feinen Teilchen aus dem aufzubereitenden Polykondensat-Material entfernt werden, die durch herkömmliche Schmelzfiltration nicht wirtschaftlich und unter Beibehaltung der Qualität des Polykondensat-Materials entfernt werden können.The invention is therefore based on the object of providing a method in which even the extremely fine particles are removed from the polycondensate material to be processed, which particles cannot be removed economically by conventional melt filtration and while maintaining the quality of the polycondensate material.
Diese Aufgabe wird durch das Verfahren gemäss Anspruch 1 gelöst.This object is achieved by the method according to claim 1.
Weitere vorteilhafte Ausgestaltungen des erfindungsgemässen Verfahrens ergeben sich aus den Unteransprüchen.Further advantageous refinements of the method according to the invention result from the subclaims.
Indem man die Oberfläche des aufzubereitenden Polykondensat-Materials vor dem Aufschmelzen entfernt, werden die vorwiegend direkt an und unter der Oberfläche eingeschlossenen feinen Teilchen dem Material entzogen, sodass sie nicht mehr durch äusserst feine Filter entfernt werden müssen.By removing the surface of the polycondensate material to be reprocessed before melting, the fine particles that are mainly trapped directly on and below the surface are removed from the material so that they no longer have to be removed by extremely fine filters.
Dabei ist es besonders vorteilhaft, wenn die Dicke der entfernten Oberflächenschicht des Polykondensat-Materials der maximalen Grosse der zu entfernenden eingeschlossenen Teilchen entspricht. Dies lässt sich dadurch begründen, dass ein Feststoffteilchen nur solange einer äusseren Reibungskraft ausgesetzt ist, durch die es in die Flaschenwand gedrückt wird, bis es vollständig in die Wand eingedrungen ist. Da grössere Teilchen durch Schmelzfiltration entfernt werden, betrifft die Oberflächen- entfemung nur die eingeschlossenen Feststoffteilchen, deren Grosse kleiner als die kleinste Filteröffnung ist.It is particularly advantageous if the thickness of the removed surface layer of the polycondensate material corresponds to the maximum size of the enclosed particles to be removed. This can be explained by the fact that a solid particle is only exposed to an external frictional force by which it is pressed into the bottle wall until it has completely penetrated the wall. Since larger particles are removed by melt filtration, the surface removal only affects the enclosed solid particles, the size of which is smaller than the smallest filter opening.
Insbesondere beträgt die Dicke der vor dem Aufschmelzen entfernten Oberflächenschicht etwa 15 bis 30 Mikrometer. Dies entspricht den kleinstmöglichen Filteröffnungen, mit denen eine Schmelzfiltration in Verbindung mit der Oberflächenentfernung durchführbar ist, ohne eine UnWirtschaftlichkeit des Verfahrens und Beeinträchtigung der Qualität des Polykondensat-Materials in Kauf nehmen zu müssen.In particular, the thickness of the surface layer removed before melting is approximately 15 to 30 micrometers. This corresponds to the smallest possible filter openings with which melt filtration in connection with the surface removal can be carried out without having to accept the inefficiency of the process and the impairment of the quality of the polycondensate material.
Prinzipiell würde es genügen, die Oberfläche der gesamten Flasche zu entfernen. Allerdings ist es in den meisten Fällen zweckmässig, die Flaschen vor der Oberflächenentfernung zu Schnipseln bzw. Flocken zu zerkleinern, um eine bessere Handhabung und mechanische Prozessführung zu ermöglichen.In principle, it would be sufficient to remove the surface of the entire bottle. In most cases, however, it is advisable to shred the bottles into chips or flakes before the surface is removed in order to enable better handling and mechanical process control.
Beispielexample
Gebrauchte PET-Flaschen wurden zu PET-Flocken bzw. PET-Schnipseln zerkleinert, gewaschen und extrudiert, wobei ein Schmelzfilter verwendet wurde, das Teilchen ab einer Grosse von 30 Mikrometer zurückhält. Das gewonnene extrudierte Produkt enthielt 16 sichtbare Defekte pro 1000 m2.Used PET bottles were crushed, washed and extruded into PET flakes or PET chips, using a melt filter that retained particles from a size of 30 micrometers. The extruded product obtained contained 16 visible defects per 1000 m 2 .
Durch Hinzufügen eines Schritts zum Entfernen der Oberfläche der zerkleinerten und gewaschenen PET-Flocken bzw. PET-Schnipsel konnte die Zahl der sichtbaren Defekte auf weniger als 1 pro 1000 m2 verringert werden. By adding a step to remove the surface of the shredded and washed PET flakes or PET chips, the number of visible defects could be reduced to less than 1 per 1000 m 2 .

Claims

Patentansprüche claims
1. Verfahren zum Aufbereiten von gebrauchtem Polykondensat-Material, insbesondere Polyethylen-Terephthalat (PET), mit den folgenden Schritten:1. A process for preparing used polycondensate material, in particular polyethylene terephthalate (PET), with the following steps:
Entfernen einer Oberflächenschicht des Polykodensat-Materials;Removing a surface layer of the polycoded material;
Schmelzen des Polykondensat-Materials; undMelting the polycondensate material; and
Erhöhen des Molekulargewichts des Polykondensat-Materials.Increase the molecular weight of the polycondensate material.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Dicke der entfernten Oberflächenschicht des Polykondensat-Materials im wesentlichen gleich der maximalen Grosse der durch Oberflächenentfernung zu entfernenden eingeschlossenen Teilchen entspricht.2. The method according to claim 1, characterized in that the thickness of the removed surface layer of the polycondensate material corresponds substantially to the maximum size of the enclosed particles to be removed by surface removal.
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das gebrauchte Polykondensat-Material flockenförmiges bzw. schnipseiförmiges Material ist, das man durch Zerkleinern bzw. Zermahlen des Verbraucherproduktes erhält.3. The method according to any one of the preceding claims, characterized in that the used polycondensate material is flake or snip-shaped material, which is obtained by crushing or grinding the consumer product.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach dem Schmelzen des reinen Polykondensat-Materials ein Schritt zur Schmelzfiltration durchgeführt wird, um jegliche nicht-schmelzenden Teilchen zu entfernen, die in dem im wesentlichen reinen Polykondensat-Material enthalten sind.4. The method according to any one of the preceding claims, characterized in that after the melting of the pure polycondensate material, a step for melt filtration is carried out in order to remove any non-melting particles which are contained in the substantially pure polycondensate material.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Dicke der entfernten Oberflächenschicht etwa der Grosse der kleinsten Filteröffnungen entspricht.5. The method according to claim 4, characterized in that the thickness of the removed surface layer corresponds approximately to the size of the smallest filter openings.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Dicke der entfernten Oberflächenschicht etwa 15 bis 30 Mikrometer entspricht. 6. The method according to claim 5, characterized in that the thickness of the removed surface layer corresponds to about 15 to 30 microns.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass 0,2 bis 20%, vorzugsweise 2 bis 6% jeder Oberfläche entfernt wird.7. The method according to any one of the preceding claims, characterized in that 0.2 to 20%, preferably 2 to 6% of each surface is removed.
8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass das Filter Filteröffnungen von mindestens 20 Mikrometer hat.8. The method according to any one of claims 4 to 7, characterized in that the filter has filter openings of at least 20 microns.
9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das gebrauchte Polykondensat-Material ein Polyester ist.9. The method according to any one of the preceding claims, characterized in that the used polycondensate material is a polyester.
10. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das gebrauchte Polykondensat-Material PET-Flaschen sind.10. The method according to any one of the preceding claims, characterized in that the polycondensate material used is PET bottles.
11. Verfahren nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die intrinsi- sche Viskosität (durch Lösungsviskosität gemessene IV) des Polykondensats um 0,02 oder mehr über die anfängliche intrinsische Viskosität des Polyesters angehoben wird.11. The method according to claim 9 or 10, characterized in that the intrinsic viscosity (measured by solution viscosity IV) of the polycondensate is increased by 0.02 or more over the initial intrinsic viscosity of the polyester.
12. Verfahren nach Anspruch 11 , dadurch gekennzeichnet, dass die intrinsische Viskosität durch Schmelzphasen-Polykondensation erhöht wird.12. The method according to claim 11, characterized in that the intrinsic viscosity is increased by melt phase polycondensation.
13. Verfahren nach Anspruch 11 , dadurch gekennzeichnet, dass die intrinsische Viskosität durch Festphasen-Polykondensation erhöht wird.13. The method according to claim 11, characterized in that the intrinsic viscosity is increased by solid-phase polycondensation.
14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass die intrinsische Viskosität durch kontinuierliche Festphasen-Polykondensation erhöht wird.14. The method according to claim 13, characterized in that the intrinsic viscosity is increased by continuous solid-phase polycondensation.
15. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass die intrinsische Viskosität erhöht wird, nachdem das Polykondensat geschmolzen und erneut verfestigt wurde.15. The method according to claim 13, characterized in that the intrinsic viscosity is increased after the polycondensate has been melted and solidified again.
16. Verfahren nach Anspruch 13, dadurch gekennzeichnet, dass die intrinsische Viskosität erhöht wird, bevor das Polykondensat geschmolzen wurde. 16. The method according to claim 13, characterized in that the intrinsic viscosity is increased before the polycondensate has been melted.
EP02732087A 2001-01-17 2002-01-17 Method for processing contaminated polycondensate materials Withdrawn EP1352023A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10102062 2001-01-17
DE2001102062 DE10102062A1 (en) 2001-01-17 2001-01-17 Processing of used polycondensate material, useful for the recycling of PET bottles comprises removal of a surface layer of the polycondensate material prior to melting.
PCT/CH2002/000028 WO2002057347A1 (en) 2001-01-17 2002-01-17 Method for processing contaminated polycondensate materials

Publications (1)

Publication Number Publication Date
EP1352023A1 true EP1352023A1 (en) 2003-10-15

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Application Number Title Priority Date Filing Date
EP02732087A Withdrawn EP1352023A1 (en) 2001-01-17 2002-01-17 Method for processing contaminated polycondensate materials

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EP (1) EP1352023A1 (en)
JP (1) JP2004524186A (en)
DE (1) DE10102062A1 (en)
MX (1) MXPA03006379A (en)
WO (1) WO2002057347A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102006040430B4 (en) 2006-08-29 2022-06-15 Evonik Operations Gmbh MTBE cleavage process
DE102011005608A1 (en) 2011-03-16 2012-09-20 Evonik Oxeno Gmbh Mixed oxide compositions and processes for the preparation of isoolefins

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Publication number Priority date Publication date Assignee Title
DE4034459A1 (en) * 1990-10-30 1992-05-07 Hoechst Ag METHOD FOR TREATING THERMALLY STRESSED POLYESTER WASTE
US5958987A (en) * 1996-04-10 1999-09-28 The Coca-Cola Company Process for separating polyester from other materials
DE19710098A1 (en) * 1997-03-12 1998-09-17 Paul Stehning Gmbh Process for the production of recycled PET from flakes, as well as PET product produced by the process
DE19953659A1 (en) * 1999-11-08 2001-05-10 Buehler Ag Method and device for decontaminating polycondensates

Non-Patent Citations (1)

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Title
See references of WO02057347A1 *

Also Published As

Publication number Publication date
MXPA03006379A (en) 2004-12-02
DE10102062A1 (en) 2002-07-18
WO2002057347A1 (en) 2002-07-25
JP2004524186A (en) 2004-08-12

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