EP2004376A2 - Dispositif, appareil et procédé de traitement de matériaux aux températures élevées, en déplacement et sous vide - Google Patents

Dispositif, appareil et procédé de traitement de matériaux aux températures élevées, en déplacement et sous vide

Info

Publication number
EP2004376A2
EP2004376A2 EP07727853A EP07727853A EP2004376A2 EP 2004376 A2 EP2004376 A2 EP 2004376A2 EP 07727853 A EP07727853 A EP 07727853A EP 07727853 A EP07727853 A EP 07727853A EP 2004376 A2 EP2004376 A2 EP 2004376A2
Authority
EP
European Patent Office
Prior art keywords
accordance
fact
heating
gas
cooling
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Withdrawn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
EP07727853A
Other languages
German (de)
English (en)
Inventor
Rüdiger FREDL
Hans Schnell
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.)
Ohl Engineering Pet Recycling Technologies GmbH
Original Assignee
Ohl Engineering Pet Recycling Technologies 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
Priority claimed from DE200610016534 external-priority patent/DE102006016534A1/de
Application filed by Ohl Engineering Pet Recycling Technologies GmbH filed Critical Ohl Engineering Pet Recycling Technologies GmbH
Publication of EP2004376A2 publication Critical patent/EP2004376A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
    • B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/049—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for working under increased or reduced pressure, with or without heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • 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
    • B29K2105/26—Scrap or recycled material

Definitions

  • the present invention concerns a device or a vacuum dryer for the drying and/or thermal treatment of granular or particulate material, especially plastic, under essentially a vacuum at elevated temperatures and movement or through-mixing of the material as well as an apparatus with such a vacuum dryer and a method for drying and/or thermal treatment of granular or particulate plastic material.
  • Vacuum tumbling dryers or double cone dryers with vacuum working area are long-established for the drying and post-condensation of granular goods at elevated temperatures.
  • Such vacuum, tumbling or double cone dryers generally called vacuum dryers, are usually composed of a double-jacketed housing, which surrounds the chamber for the bulk or ground material to be dried.
  • a heat transfer medium which has been heated outside the dryer.
  • the goods charged in the dryer can be brought to the temperature necessary for drying and/or thermal treatment.
  • PET polyethylene terephthalate
  • a corresponding vacuum tumbling dryer is used for the post-condensation of the recycled PET at temperatures of 200D?C to 250D?C and a pressure ⁇ 1 mbar with retention times of 4 to 18 hours for the post-condensation stage.
  • the object of the present invention is to provide a device or a vacuum dryer or a corresponding apparatus, with which treatment of grainy, granular or particulate goods, such as especially plastic materials, can be improved.
  • the retention time in the vacuum dryer is to be reduced, for example, for the recycling of PET, with the goal at the same time of being able to set defined treatment parameters that are understandable for all of the treated material.
  • the invention starts out from the realization that heating and/or cooling of the granular or particulate material in the aforementioned dryers requires a substantial amount of time, which offers great potential for time saving. Accordingly, the inventors have found a way here to improve treatment in corresponding dryers.
  • heating the material to be treated via a heating or a double jacket is relatively ineffective, so that a proposal is made to effect heating by through-feeding corresponding gaseous heating media, for example, inert gases, especially nitrogen, argon and the like.
  • gaseous heating media for example, inert gases, especially nitrogen, argon and the like.
  • the heating medium comes into immediate, direct contact with the goods to be heated and heat transfer can take place faster.
  • the complex design of a double- jacketed housing can also be eschewed. Rather, a single-jacketed housing is sufficient, a fact which brings additional economic advantages.
  • a corresponding device i.e. a dryer and the associated method
  • a corresponding device can be arranged such that already pre-heated material is charged into the movable chamber of the device, whereby, for the purpose of avoiding undesirable reactions of the material to be treated, this takes place under inert gas atmosphere or essentially vacuum conditions, that is, in the pressure range ⁇ 1 mbar.
  • the device must be provided with means for vacuum-tight or gas-tight coupling to supply lines or transfer containers at the charge opening(s). In this way, the entire time-consuming heating step in the dryer is dispensed with. This is especially advantageous if the material already has a certain temperature from a preceding process step, such as is the case for recycling of PET after the crystallization step.
  • a corresponding heating vessel upstream of the device such that the heating process takes place in the heating vessel and the movable heating chamber is not blocked by the heating periods.
  • a cooling vessel can be connected downstream of the dryer in order that the cooling phase may not have to be performed in the dryer itself, but rather in the cooling vessel.
  • the various processes, such as heating and/or cooling on one hand and through-mixing on the other are performed in different devices and thus throughput through the vacuum dryer can be increased.
  • the vacuum dryer can be manufactured more favourably and more simply by eschewing corresponding heat transfer systems.
  • the device or the vacuum dryer can be formed so as to have one wall. Temperature losses during mixing in the vacuum dryer can be compensated with less powerful heaters, for example electrical heaters.
  • simple heating mats can be provided at the external surface of the vacuum dryer, or the vacuum dryer can be formed such that these may be arranged at its exterior. In this way, the outlay for the manufacture of the vacuum dryer is markedly reduced overall.
  • the heating and cooling processes in the heating vessel and/or cooling vessel before and/or after the vacuum dryer are also performed such that gaseous heating and/or cooling media are transported through the heating and/or cooling vessels in order that good and effective heat transfer may be assured in direct contact with the goods to be heated and/or cooled.
  • the inventive apparatus preferably has heating devices, cooling devices and/or heat exchangers in the loops of the heating or cooling media in order that the heating or cooling media may accordingly be heated or cooled.
  • the heat of the material to be treated that is released during cooling is used simultaneously to heat the material to be treated.
  • This can be accomplished, for example, by providing heat exchanger devices in which the material already treated and the material still to be treated are transported past each other.
  • the cooling and/or heating medium from the one loop of the first heating and/or cooling vessel can also be transported past the cooling and/or heating medium from the other loop of the second heating or cooling vessel in a heat exchanger in order that heat transfer and heat recovery may be accomplished in this way.
  • This advantageous embodiment thus additionally offers a substantial potential for energy saving.
  • the heat transfer can take place here from solid to solid, from solid to liquid, solid to gas or liquid to gas and vice versa in each case.
  • the temperatures during treatment in the dryer are usually above ambient, especially above 50 0 C, preferably above 100 0 C and most preferably above 150 0 C, with the chamber preferably greater than 1 m 3 , especially greater than 10 m 3 .
  • FIG. 1 a schematic diagram of a first inventive apparatus
  • FIG. 2 an overview of a second inventive apparatus.
  • FIG. 1 is a schematic diagram of an apparatus with a vacuum dryer 1 , an upstream heating vessel 10 and a downstream cooling vessel 11.
  • the vacuum dryer 1 has a double-cone shape, with the external jacket of the chamber 41 formed as one wall.
  • a heating vessel 10 upstream of the vacuum dryer 1 is a heating vessel 10, which has a charge opening 12 and a discharge opening 13, which may both be sealed vacuum-tight or gas-tight. Furthermore, at the heating vessel 10, which is likewise implemented as one wall, gas inlets and/or outlets 24, 25 and 35 are provided.
  • the gas inlet 25 as well as the gas outlet 24 are part of a line loop 16, through which gas can be pumped through the heating vessel 10.
  • a pumping device 19 as well as a heating device 18, which are connected by a line 23.
  • a gas inlet 20 is likewise provided with a shut-off valve, through which fresh gas can be supplied.
  • the gas, which is pumped in the line loop 16, is usually inert gas, for example nitrogen. However, other inert gases, for example argon or the like can be used for this. If suitable, normal or treated air can also serve as gas.
  • the gas pumped in the line loop 16 serves to heat the plastic granules provided in the heating vessel 10, with the gas, which is removed from the heating vessel 10, being heated in the heating device 18, pumped via the pumping device 19 through the line 23 and injected at the gas inlet opening 25 of the heating vessel into the lower region of the heating vessel 10 where it is transported through the loosely piled bulk or ground material of plastic particles or plastic granules, such that this is heated by heat transfer from the heated gas to the plastic particles.
  • the inert gas can be exhausted from the heating vessel 10 through the gas exhaust opening 35, to which is likewise assigned a shut-off valve 36.
  • lines 7 as well as a pumping unit 9 are provided.
  • the same pumping unit and partly the same lines 7 are used for this purpose which are also attached to the vacuum dryer 1.
  • the heating vessel 10 has a valve opening 42, with which the heating vessel 10 can be vented.
  • the preferred embodiment of the inventive apparatus in Fig. 1 has a cooling vessel 11 , which is downstream of the vacuum dryer 1.
  • the cooling vessel 11 is constructed in similar way as the heating vessel 10 and has a charge opening 14 as well as a discharge opening 15, which may likewise be sealed vacuum-tight or gas-tight.
  • Also provided at the cooling vessel 11 is furthermore a closable valve opening 43, which likewise serves the purpose of venting.
  • the cooling vessel 11 has gas inlet and outlet openings 32, 33 and 34.
  • the gas inlet opening 33 and the gas outlet opening 32 are in turn part of a line loop 17 and connected to one another via the line 29.
  • the line loop 17 has a heat exchanger 26 and a pumping device 27 in addition to the shut-off devices 30 and 31.
  • the heat exchanger 26 serves to cool gaseous cooling medium exhausted from the cooling vessel 11 , again especially an inert gas, such as nitrogen, argon and the like, via contact with a cooling medium, for example cooling water.
  • the line loop 17 is also provided with a fresh gas supply 28, which may likewise be sealed.
  • a gas removal opening 34 is provided in the cooling vessel 11 , said opening also being connected to the central pumping device 9 via corresponding exhaust gas lines 7.
  • This material to be treated may, for example, be a crystalline polyethylene terephthalate from the preceding process step of the recycling of polyethylene terephthalate with a temperature of approximately 140 0 C.
  • the charged plastic granules or the plastic particles are heated by through-passage of heated inert gas, especially heated nitrogen, to a desired temperature, for example a temperature of 200 0 C to 250 0 C.
  • a desired temperature for example a temperature of 200 0 C to 250 0 C.
  • the inert gas in the line loop 16 is pumped such that the warm gas is injected via the gas inlet 25 into the lower region of the heating vessel 10, through the loose pile of plastic granules and is released at the gas outlet 24 from the heating vessel 10 into the line loop 16 again.
  • This gas is then pumped through the line 23 and passes through the heating device 18, which, for example, may be an electrical heater, a gas heater or other heat source.
  • the gas is heated up to corresponding temperatures in order that it may then finally be again blown through the gas inlet 25 into the heating vessel 10.
  • the temperature in the heating vessel 10 and/or in the heating device 18 can be regulated or controlled by corresponding sensors and regulating or control circuits 18, such that altogether a precise and homogeneous temperature of the material to be processed in the heating vessel 10 can be guaranteed.
  • the vacuum dryer 1 As soon as the material in the heating vessel 10 has the necessary temperature, it can be transferred in inert gas atmosphere or corresponding vacuum conditions to the vacuum dryer 1 , which follows the heating vessel 10. To this end, for example, the vacuum dryer 1 with its chamber 41 has to be rotated about the rotary axis 2, such that the charge opening 5 lies in the proximity of the discharge opening 13 of the heating vessel 10. The charge opening 5 and the discharge opening 13 of the heating vessel 10 can be connected together vacuum or gas-tight by corresponding coupling means, such that the material in the heating vessel 10 can be charged into the chamber 41 of the vacuum dryer.
  • the vacuum dryer can begin immediately with the drying process and/or thermal treatment.
  • the drive 4 in the form of an electric motor Via the drive 4 in the form of an electric motor, the vacuum dryer 1 or the chamber 41 is set into corresponding rotation or swivelling movements.
  • the vacuum dryer 1 or the chamber 41 is set into corresponding rotation or swivelling movements.
  • the vacuum dryer 1 or the chamber 41 is set into corresponding rotation or swivelling movements.
  • the vacuum dryer 1 or the chamber 41 is set into corresponding rotation or swivelling movements.
  • the material first in the vacuum dryer 1 to the desired operating temperature in the range of, for example, 200 0 C to 250 0 C. Only possible heat losses during the treatment time need to be compensated for by an appropriate heating device. Since the necessary energy quantities require only a small amount of heating power, this heating device (not shown) can be preferably provided via heating mats that are simple to attach to the surface of the chamber 41.
  • the chamber 41 of the vacuum dryer can be exhausted especially during the treatment of the plastic material, with the exhausted gas being transported across a filter 8 in order that dust particles and the like may be filtered out. Accordingly, during the entire treatment period, virtual vacuum conditions with very low pressures in the range of 0.01 mbar up to 1 mbar can be set and maintained .
  • the vacuum dryer 1 After the requisite treatment in the vacuum dryer 1 , the vacuum dryer 1 is rotated such that that the charge opening 5 is arranged in the proximity of the chamber opening 14 of the cooling vessel 11 such that the corresponding means for vacuum-tight or gas-tight coupling of the charge opening 5 and the chamber opening 14 of the cooling vessel 11 can be connected together. [0036] The material in the vacuum dryer 1 is then transferred into the cooling vessel 11 , such that the vacuum dryer is immediately available again to receive new material to be treated, which in the meantime has again been heated in the heating vessel 10.
  • a gas removal opening 34 is connected via the line 7 to the central pumping device 9 in order that the gas or the container may be pumped empty, for example after cooling.
  • the gas removal opening 34 may also be sealed via a valve arrangement 37, such as the valve opening 43, which serves to vent the cooling vessel 11.
  • the container can be emptied via the discharge opening 15.
  • FIG. 2 shows a further embodiment of the inventive apparatus in which the apparatus of Fig. 1 has been further developed.
  • Fig. 2 essentially corresponds to that of Fig. 1 , such that the description and the reference symbols of the components are identical here and are not repeated.
  • the two line loops 16 and 17 have each been extended by the subloops 38 and 39, which have a common heat exchanger 40.
  • the cool heating medium again preferably inert gas, emanating from the heating vessel 10 in the heat exchanger 40.
  • the heat recovered during the cooling process in the cooling vessel 11 can be partly reused to heat the plastic material in the heating vessel 10, a fact which leads to substantial energy saving.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé et un appareil de séchage et/ou de traitement thermique de matière plastique en granules ou en particules, appareil comprenant un sécheur sous vide (1) et un sécheur sous vide correspondant présentant une chambre scellable étanche au gaz (41) pour la matière plastique et un axe de rotation (2) permettant de faire tourner ou pivoter la chambre dans laquelle la chemise de la chambre est formée en tant que paroi. L'appareil est caractérisé en ce qu'un conteneur de chauffage et/ou de refroidissement (10, 11) sont agencés en amont et/ou en aval du sécheur sous vide (1) de telle façon que dans le procédé, lors d'une première étape, la matière plastique préchauffée est chargée en l'absence d'air dans une chambre scellable étanche au vide ou étanche au gaz du sécheur sous vide, ou bien la matière plastique non préchauffée est chargée dans une chambre scellable étanche au vide ou étanche au gaz du sécheur sous vide et, après évacuation du sécheur sous vide, est chauffée par alimentation et/ou injection d'un gaz inerte chaud, pour être ensuite mélangée complètement, lors d'une seconde étape, par déplacement du sécheur sous vide (1).
EP07727853A 2006-04-07 2007-04-05 Dispositif, appareil et procédé de traitement de matériaux aux températures élevées, en déplacement et sous vide Withdrawn EP2004376A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US79005606P 2006-04-07 2006-04-07
DE200610016534 DE102006016534A1 (de) 2006-04-07 2006-04-07 Vorrichtung sowie Apparatur und Verfahren zur Behandlung von Materialien bei erhöhter Temperatur und unter Bewegung und unter Vakuum
PCT/EP2007/053385 WO2007116022A2 (fr) 2006-04-07 2007-04-05 Dispositif, appareil et procédé de traitement de matériaux aux températures élevées, en déplacement et sous vide

Publications (1)

Publication Number Publication Date
EP2004376A2 true EP2004376A2 (fr) 2008-12-24

Family

ID=38326943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07727853A Withdrawn EP2004376A2 (fr) 2006-04-07 2007-04-05 Dispositif, appareil et procédé de traitement de matériaux aux températures élevées, en déplacement et sous vide

Country Status (2)

Country Link
EP (1) EP2004376A2 (fr)
WO (1) WO2007116022A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10539366B2 (en) * 2014-04-30 2020-01-21 Stephen B. Maguire Method and apparatus for vacuum drying granular resin material
DE102010042965A1 (de) * 2010-10-26 2012-05-10 Krones Aktiengesellschaft Verfahren zum Herstellen von Kunststoffbehältern und/oder Kunststoffvorformlingen
PL2463338T3 (pl) 2010-12-13 2014-01-31 Lanxess Deutschland Gmbh Sposób optymalizacji postępowania podczas krystalizacji mas do formowania z poliestrów
ITPD20130255A1 (it) * 2013-09-19 2015-03-20 Christian Schiavolin Metodo e apparato di trattamento per materiale scorrevole
EP3290469A1 (fr) 2016-09-01 2018-03-07 LANXESS Deutschland GmbH Masses de formage thermoplastiques
EP3290475A1 (fr) 2016-09-01 2018-03-07 LANXESS Deutschland GmbH Masses de formage thermoplastiques
IT201700043004A1 (it) * 2017-04-19 2018-10-19 Plastic Systems S P A Processo di essiccamento di materiale granulare polimerico ed impianto operante secondo tale processo
US20190308344A1 (en) 2018-04-04 2019-10-10 Novatec, Inc. Method and apparatus for polymer drying using inert gas
US11364657B2 (en) 2018-04-04 2022-06-21 Novatec, Inc. Reducing moisture in granular resin material using inert gas
EP4177311A1 (fr) 2021-11-04 2023-05-10 LANXESS Performance Materials GmbH Utilisation de polyamide 6

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
DE1098448B (de) 1959-02-26 1961-01-26 Erwin Lothar Holland Merten Beschickungsvorrichtung fuer eine Trocknungstrommel
DE1246590B (de) 1962-08-03 1967-08-03 Haas Vakuum Technik G M B H Vakuum-Taumeltrockner
FR2760524A1 (fr) 1997-03-10 1998-09-11 Paul Christophe Four tournant etanche pour le sechage ou le traitement thermique de produits organiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007116022A2 *

Also Published As

Publication number Publication date
WO2007116022A2 (fr) 2007-10-18
WO2007116022A3 (fr) 2008-01-03

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