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EP1203040A1 - Method and device for producing crystallisable plastic material - Google Patents

Method and device for producing crystallisable plastic material

Info

Publication number
EP1203040A1
EP1203040A1 EP00930958A EP00930958A EP1203040A1 EP 1203040 A1 EP1203040 A1 EP 1203040A1 EP 00930958 A EP00930958 A EP 00930958A EP 00930958 A EP00930958 A EP 00930958A EP 1203040 A1 EP1203040 A1 EP 1203040A1
Authority
EP
European Patent Office
Prior art keywords
plastic material
crystallization
pet
temperature
production
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Withdrawn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
EP00930958A
Other languages
German (de)
French (fr)
Inventor
Camille Bohrer
Martin Müller
Frank Glöckner
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.)
Polymetrix AG
Automatik Plastics Machinery GmbH
Original Assignee
Buehler AG
Rieter Automatik 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 Buehler AG, Rieter Automatik GmbH filed Critical Buehler AG
Publication of EP1203040A1 publication Critical patent/EP1203040A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to a method for producing crystallizable plastic material such as polyesters and the like, in particular PET, by crystallizing and post-condensing in the solid phase after the melting phase, and to an apparatus for carrying out the method.
  • the crystallization and post-condensation in solid phase (SSP) of polyesters obtained from a melt, in particular of PET (polyethylene terephthalate), is generally known.
  • the molten polyester (melting temperature 270 ° C and higher) is processed to strand pellets, for example, with simultaneous cooling to room temperature and serves as an amorphous starting material for subsequent crystallization and post-condensation to PET.
  • crystallization takes place in two fluidized beds (combination of bubble bed and fluid bed) at temperatures from 140 ° C. to 180 ° C. After crystallization, it bounces to dissolve agglomerates.
  • EP-A-822214 now describes a process in which, without cooling the melt to a temperature far below the crystallization temperature, extrusion, pelleting and crystallization of polyester material take place.
  • a temperature of approx. 160 ° C to 220 ° C is maintained and crystallization should take approx. 5-30 minutes.
  • such a waiver of excessive cooling during pelleting is already known from WO 97/23543.
  • a polyester is held in a melt at approx. 270 ° C and passes through an opening in the form of a drop onto a hot metal plate at approx. 135 ° C, where crystallization is already taking place. That follows then a normal SSP process over 24 hours at approx. 205 ° C.
  • US-A-5510454 can also measure the temperature of the plate to which the drops are coming
  • thermoplastic materials for example PET according to WO94 / 25239
  • plastic strands to be dried are quenched for a maximum of 1.5 seconds in order to achieve a surface temperature of at least 100 ° C. Due to this only partial cooling of the plastic, the crystallization time should be a maximum of approx. 20 seconds.
  • a moving bed reactor can be evacuated, a separator for separating dust from the exhaust gas being provided for a vacuum pump.
  • a separator for separating dust from the exhaust gas being provided for a vacuum pump.
  • the invention is based on the object of further developing a method for producing crystallizable plastic material such as polyester or PET so that larger crystallites and a better surface crystal structure achieve a higher reactivity in the SSP process, and that solid foreign substances reliably crystallize from Plastic material to be separated. Energy consumption should also be reduced. This is done on the basis of the features of claim 1.
  • the invention is also based on the object of providing a suitable device for carrying out the aforementioned method.
  • the invention is described in more detail in an exemplary embodiment with reference to a drawing.
  • the drawing shows a schematic diagram in the single figure.
  • PET 1 From a melting reactor (not shown), PET 1 reaches a cutter 2 at a temperature of approximately 280 ° C. with cooling and solidification.
  • the resulting amorphous pellets 3 with a temperature of 140 ° C to 180 ° C then pass without further cooling into a fluidized bed 4 with a residence time customary in the process and then onto a sieve 5, which can be followed by a circulating air sifter if necessary, for dust and separate other foreign solids.
  • the fluidized bed 2 can also be a combination of a bubble bed and a fluidized bed. If necessary, the sieving process is followed by further crystallization (not shown).
  • the PET purified and crystallized in this way arrives in a preheater 6 or directly in a shaft reactor 7, where the solid phase post-condensation to PET takes place, and only then is the granulate cooled to room temperature in a cooler 8.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

The invention relates to a method and a device for producing crystallisable plastic material, especially PET, by means of a conventional SSP treatment. The plastic material only cools down to the crystallisation temperature before crystallisation. After granulation and crystallisation, the plastic material is subjected to a sieving process in a temperature remaining approximately the same.

Description

Verfahren und Vorrichtung zur Herstellung von kristallisationsfähigem Method and device for producing crystallizable
Kunststoff materialPlastic material
Die Erfindung betrifft ein Verfahren zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyestern und dergleichen, insbesondere von PET, durch ein der Schmelzphase nachgeordnetes Kristallisieren und Nachkondensieren in fester Phase sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for producing crystallizable plastic material such as polyesters and the like, in particular PET, by crystallizing and post-condensing in the solid phase after the melting phase, and to an apparatus for carrying out the method.
Das Kristallisieren und Nachkondensieren in fester Phase (SSP) von aus einer Schmelze gewonnenen Polyestern, insbesondere von PET (Polyethylenterephthalat) ist allgemein bekannt. Hierbei wird das schmelzflüssige Polyester (Schmelztemperatur 270°C und höher) unter gleichzeitiger Abkühlung bis auf Raumtemperatur zum Beispiel zu Stranggranulat verarbeitet und dient als amorphes Ausgangsmaterial für ein nachfolgendes Kristallisieren und Nachkondensieren zu PET. Gemäss der EP-A-379684 erfolgt zum Beispiel das Kristallisieren in zwei Wirbelbetten (Kombination von Sprudelbett und Fliessbett) bei Temperaturen von 140°C bis 180°C. Nach dem Kristallisieren erfolgt ein Prallen, um Agglomerate aufzulösen.The crystallization and post-condensation in solid phase (SSP) of polyesters obtained from a melt, in particular of PET (polyethylene terephthalate), is generally known. Here, the molten polyester (melting temperature 270 ° C and higher) is processed to strand pellets, for example, with simultaneous cooling to room temperature and serves as an amorphous starting material for subsequent crystallization and post-condensation to PET. According to EP-A-379684, for example, crystallization takes place in two fluidized beds (combination of bubble bed and fluid bed) at temperatures from 140 ° C. to 180 ° C. After crystallization, it bounces to dissolve agglomerates.
Es ist aber auch bekannt, bereits bei einer Temperatur von weniger als 140°C zu kristallisieren und auch die Festphasennachkondensation bei einer Temperatur oberhalb 180°C durchzuführen (zum Beispiel gemäss der nicht vorveröffentlichten CH 02131/92- 2).However, it is also known to crystallize even at a temperature of less than 140 ° C. and also to carry out the solid phase post-condensation at a temperature above 180 ° C. (for example in accordance with the not previously published CH 02131 / 92-2).
Die EP-A-822214 beschreibt nun ein Verfahren, bei dem unter Verzicht auf eine Kühlung der Schmelze auf eine Temperatur weit unterhalb der Kristallisationstemperatur ein Strangextrudieren, Pelletieren und Kristallisieren von Polyestermaterial erfolgt. Hierbei wird eine Temperatur von ca. 160°C bis 220°C beibehalten und das Kristallisieren soll ca. 5-30 Minuten erfordern. Allerdings ist ein solcher Verzicht auf ein starkes Abkühlen beim Pelletieren schon aus der WO 97/23543 vorbekannt. Ein Polyester wird bei ca. 270°C in einer Schmelze gehalten und gelangt durch eine Öffnung in Tropfenform auf eine heisse Metallplatte von ca. 135°C, wo bereits eine Kristallisation erfolgt. Dem folgt dann ein üblicher SSP-Prozess über 24 Stunden bei ca. 205°C. Nach der Lehre derEP-A-822214 now describes a process in which, without cooling the melt to a temperature far below the crystallization temperature, extrusion, pelleting and crystallization of polyester material take place. A temperature of approx. 160 ° C to 220 ° C is maintained and crystallization should take approx. 5-30 minutes. However, such a waiver of excessive cooling during pelleting is already known from WO 97/23543. A polyester is held in a melt at approx. 270 ° C and passes through an opening in the form of a drop onto a hot metal plate at approx. 135 ° C, where crystallization is already taking place. That follows then a normal SSP process over 24 hours at approx. 205 ° C. According to the teaching of
US-A-5510454 kann die Temperatur der Platte, auf die die Tropfen gelangen auchUS-A-5510454 can also measure the temperature of the plate to which the drops are coming
180°C betragen.180 ° C.
Bekannt ist weiterhin ein Verfahren zur gleichzeitigen Trocknung und Kristallisation thermoplastischer Kunststoffe, zum Beispiel von PET gemäss der WO94/25239, wobei zu trocknende Kunststoffstränge während einer Zeitdauer von maximal 1 ,5 Sekunden zur Erzielung einer Oberflächentemperatur von mindestens 100°C abgeschreckt werden. Die Kristallisationszeit soll durch diese nur teilweise Abkühlung des Kunststoffs maximal ca. 20 Sekunden betragen.Also known is a process for the simultaneous drying and crystallization of thermoplastic materials, for example PET according to WO94 / 25239, wherein plastic strands to be dried are quenched for a maximum of 1.5 seconds in order to achieve a surface temperature of at least 100 ° C. Due to this only partial cooling of the plastic, the crystallization time should be a maximum of approx. 20 seconds.
Bei einer Vorrichtung zur Herstellung von Polyamiden gemäss der DE-A-19510698 kann ein Wanderbettreaktor evakuiert werden, wobei einer Vakuumpumpe ein Abscheider zum Abscheiden von Staub aus dem Abgas vorgesehen sein kann. Ein zuveriässi- ges Trennen von festen Fremdstoffen, Stäuben und dergleichen vom Kunststoff material ist jedoch nicht gegeben.In a device for producing polyamides according to DE-A-19510698, a moving bed reactor can be evacuated, a separator for separating dust from the exhaust gas being provided for a vacuum pump. However, there is no reliable separation of solid foreign substances, dusts and the like from the plastic material.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyester oder PET so weiter zu entwickeln, dass durch grössere Kristallite und eine bessere Oberflächenkristallstruktur eine höhere Reaktivität im SSP-Prozess erreicht wird, und dass feste Fremdstoffe nach dem Kristallisieren zuverlässig vom Kunststoffmaterial getrennt werden. Ebenso soll der Energieverbrauch gesenkt werden. Dies erfolgt an Hand der Merkmale des Patentanspruchs 1.The invention is based on the object of further developing a method for producing crystallizable plastic material such as polyester or PET so that larger crystallites and a better surface crystal structure achieve a higher reactivity in the SSP process, and that solid foreign substances reliably crystallize from Plastic material to be separated. Energy consumption should also be reduced. This is done on the basis of the features of claim 1.
Der Erfindung liegt auch die Aufgabe zugrunde, eine geeignete Vorrichtung zur Durchführung des vorgenannten Verfahrens zu schaffen.The invention is also based on the object of providing a suitable device for carrying out the aforementioned method.
Bevorzugte Ausführungsvarianten sind in den Unteransprüchen enthalten.Preferred embodiments are contained in the subclaims.
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel an Hand einer Zeichnung näher beschrieben. Die Zeichnung zeigt in der einzigen Figur eine Prinzipdarstellung.The invention is described in more detail in an exemplary embodiment with reference to a drawing. The drawing shows a schematic diagram in the single figure.
Aus einem nicht dargestellten Schmelzreaktor heraus gelangt PET 1 mit einer Temperatur von ca. 280°C unter Abkühlung und Verfestigung in einen Cutter 2. Die so entstehenden amorphen Pellets 3 mit einer Temperatur von 140°C bis 180°C gelangen danach ohne weitere Abkühlung in ein Wirbelbett 4 mit verfahrensüblicher Verweilzeit und danach auf ein Sieb 5, dem bei Bedarf noch ein Umluftsichter nach- schaltet sein kann, um Staub und andere fremde Feststoffe abzuscheiden.From a melting reactor (not shown), PET 1 reaches a cutter 2 at a temperature of approximately 280 ° C. with cooling and solidification. The resulting amorphous pellets 3 with a temperature of 140 ° C to 180 ° C then pass without further cooling into a fluidized bed 4 with a residence time customary in the process and then onto a sieve 5, which can be followed by a circulating air sifter if necessary, for dust and separate other foreign solids.
Gemäss der EP-A-379684 kann das Wirbelbett 2 auch eine Kombination von Sprudelbett und Fliessbett darstellen. Bei Bedarf folgt auf den Siebvorgang ein weiteres Kristallisieren (nicht dargestellt).According to EP-A-379684, the fluidized bed 2 can also be a combination of a bubble bed and a fluidized bed. If necessary, the sieving process is followed by further crystallization (not shown).
In üblicher Weise gelangt das so gereinigte und kristallisierte PET in einen Vorerhitzer 6 oder direkt in einen Schachtreaktor 7, wo die Festphasennachkondensation zu PET erfolgt und erst danach wird das Granulat in einem Kühler 8 auf Raumtemperatur gekühlt. In a customary manner, the PET purified and crystallized in this way arrives in a preheater 6 or directly in a shaft reactor 7, where the solid phase post-condensation to PET takes place, and only then is the granulate cooled to room temperature in a cooler 8.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyestern, z.B. PET durch Aufschmelzen von amorphem Kunststoffmaterial, welches nachfolgend granuliert, kristallisiert und nachkondensiert wird, wobei das Kunststoffmaterial keiner Aufheizung vor dem Kristallisieren unterworfen werden muss, da- durch gekennzeichnet, dass das Kunststoff material nach dem Kristallisieren einem Siebvorgang unterworfen wird.1. Process for the production of crystallizable plastic material such as polyesters, e.g. PET by melting amorphous plastic material, which is subsequently granulated, crystallized and post-condensed, the plastic material not having to be subjected to heating before crystallization, characterized in that the plastic material is subjected to a sieving process after crystallization.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Kristallisation bei einer Temperatur von 140°C bis 180°C erfolgt.2. The method according to claim 1, characterized in that the crystallization takes place at a temperature of 140 ° C to 180 ° C.
3. Vorrichtung zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyester, z.B. PET, zur Durchführung eines Verfahrens nach Anspruch 1 , enthaltend eine Granuliervorrichtung, ein Wirbelbett (4) und einen Schachtreaktor (7), dadurch gekennzeichnet, dass dem Wirbelbett (4) ein Sieb (5) nachgeordnet ist.3. Device for the production of crystallizable plastic material such as polyester, e.g. PET, for carrying out a method according to claim 1, comprising a granulating device, a fluidized bed (4) and a shaft reactor (7), characterized in that a sieve (5) is arranged downstream of the fluidized bed (4).
4. Verfahren zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyester, z.B. PET durch Erschmelzen von amorphen Kunststoffmaterial, welches nachfolgend kristallisiert, granuliert und nachkondensiert wird, wobei das Kunststoffmaterial vor dem Kristallisieren nicht erneut erwärmt werden muss, dadurch gekenn- zeichnet, dass das Kunststoffmaterial mit etwa gleicher Temperatur wie beim Kristallisieren und Granulieren nach dem Granulieren einem Siebvorgang unterworfen wird.4. Process for the production of crystallizable plastic material such as polyester, e.g. PET by melting amorphous plastic material, which is subsequently crystallized, granulated and post-condensed, the plastic material not having to be reheated before crystallization, characterized in that the plastic material has a sieving process at about the same temperature as in crystallization and granulation after granulation is subjected.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Temperatur beim Kristallisieren, Granulieren und Sieben 100°C bis 200°C, bevorzugt 120°C bis 160°C beträgt.5. The method according to claim 4, characterized in that the temperature during crystallization, granulation and sieving is 100 ° C to 200 ° C, preferably 120 ° C to 160 ° C.
6. Verfahren nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die Verweilzeit beim Kristallisieren ca. 1 bis 40 Sekunden beträgt, bevorzugt 2 bis 20 Sekunden. 6. The method according to any one of claims 4 or 5, characterized in that the residence time during crystallization is approximately 1 to 40 seconds, preferably 2 to 20 seconds.
7. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass auf den Siebvorgang ein weiteres Kristallisieren folgt.7. The method according to claim 4, characterized in that the screening process is followed by a further crystallization.
8. Vorrichtung zur Herstellung von kristallisationsfähigem Kunststoffmaterial wie Polyester, z.B. PET zur Durchführung eines Verfahrens nach Anspruch 4, mit einem Kristallisator und einem nachfolgenden Cutter (2), dadurch gekennzeichnet, dass dem Cutter (2) ein Sieb (5) nachgeordnet ist.8. Device for the production of crystallizable plastic material such as polyester, e.g. PET for carrying out a method according to claim 4, with a crystallizer and a subsequent cutter (2), characterized in that a sieve (5) is arranged after the cutter (2).
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass dem Sieb (5) ein weiterer Kristallisator nachgeordnet ist. 9. The device according to claim 8, characterized in that the screen (5) is followed by a further crystallizer.
EP00930958A 1999-08-18 2000-06-09 Method and device for producing crystallisable plastic material Withdrawn EP1203040A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19938583A DE19938583A1 (en) 1999-08-18 1999-08-18 Method and device for producing crystallizable plastic material
DE19938583 1999-08-18
PCT/CH2000/000317 WO2001012698A1 (en) 1999-08-18 2000-06-09 Method and device for producing crystallisable plastic material

Publications (1)

Publication Number Publication Date
EP1203040A1 true EP1203040A1 (en) 2002-05-08

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ID=7918406

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EP00930958A Withdrawn EP1203040A1 (en) 1999-08-18 2000-06-09 Method and device for producing crystallisable plastic material

Country Status (15)

Country Link
US (1) US7291694B1 (en)
EP (1) EP1203040A1 (en)
JP (1) JP4564698B2 (en)
KR (1) KR100661699B1 (en)
CN (1) CN1169860C (en)
AU (1) AU776078B2 (en)
BR (2) BR0017443A (en)
CA (1) CA2381965C (en)
DE (1) DE19938583A1 (en)
HK (1) HK1049850A1 (en)
MX (1) MXPA02001700A (en)
PL (1) PL213313B1 (en)
TR (1) TR200200120T2 (en)
WO (1) WO2001012698A1 (en)
ZA (1) ZA200200954B (en)

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BR0201454A (en) 2002-08-20
CN1370193A (en) 2002-09-18
DE19938583A1 (en) 2001-02-22
KR20020027550A (en) 2002-04-13
JP2003507507A (en) 2003-02-25
CA2381965A1 (en) 2001-02-22
ZA200200954B (en) 2002-10-30
AU776078B2 (en) 2004-08-26
WO2001012698A1 (en) 2001-02-22
JP4564698B2 (en) 2010-10-20
TR200200120T2 (en) 2002-07-22
AU4908100A (en) 2001-03-13
US7291694B1 (en) 2007-11-06
HK1049850A1 (en) 2003-05-30
MXPA02001700A (en) 2005-07-29
PL353866A1 (en) 2003-12-01
CN1169860C (en) 2004-10-06
CA2381965C (en) 2009-12-15
BR0017443A (en) 2006-07-18
PL213313B1 (en) 2013-02-28
KR100661699B1 (en) 2006-12-26

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