EP1353983A1 - Procede pour preparer un melange de matieres plastiques - Google Patents

Procede pour preparer un melange de matieres plastiques

Info

Publication number
EP1353983A1
EP1353983A1 EP01995592A EP01995592A EP1353983A1 EP 1353983 A1 EP1353983 A1 EP 1353983A1 EP 01995592 A EP01995592 A EP 01995592A EP 01995592 A EP01995592 A EP 01995592A EP 1353983 A1 EP1353983 A1 EP 1353983A1
Authority
EP
European Patent Office
Prior art keywords
solvent
plastic mixture
molecular weight
polymers
separation
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Withdrawn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
EP01995592A
Other languages
German (de)
English (en)
Inventor
Eberhard Fischer
Robert Schleich
Thomas Kaiser
Bernd Bungert
Andreas Thiele
Guido Gorski
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.)
SEA WAY REFINING BV
Siemens Axiva GmbH and Co KG
Original Assignee
Der Gruene Punkt Duales System Deutschland AG
Siemens Axiva GmbH and Co KG
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 Der Gruene Punkt Duales System Deutschland AG, Siemens Axiva GmbH and Co KG filed Critical Der Gruene Punkt Duales System Deutschland AG
Publication of EP1353983A1 publication Critical patent/EP1353983A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • 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
    • B29B2017/0293—Dissolving the materials in gases or liquids
    • 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 a plastic mixture consisting of high molecular weight polymers which is contaminated with low molecular weight polymers and other foreign substances.
  • High molecular weight polymers are those with a molecular weight above about 10,000, for example polyvinyl chloride, polystyrene, polyethylene terephthalate, polypropylene and polyethylenes, such as e.g. LDPE (low density polyethylene), LLDPE (linear low density polyethylene), MDPE (medium density polyethylene), HDPE (high density polyethylene), UHDPE (ultra high density polyethylene), with appropriate degree of polymerization.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • UHDPE ultra high density polyethylene
  • low molecular weight polymers are those with a molecular weight of up to approximately 5000, for example waxes or degraded high molecular weight polymers.
  • the plastic mixture can also contain polyester.
  • a content of waxes, additives, degradation products and other impurities has been found to be disruptive for further utilization, especially if these polyolefins are to be used like new goods.
  • From DE 41 22 277 AI it is known to subject shredded films of polyethylene in a solvent bath containing an organic solvent to intensive frictional surface cleaning and extraction in which ingredients and polyethylene waxes are removed from the chips without the plastic itself is dissolved, and inks are also removed by the frictive surface cleaning.
  • Low-boiling acetic acid esters such as methyl, ethyl or isopropyl acetate or also low-boiling alcohols such as ethyl alcohol are mentioned as suitable solvents, the acetic acid esters being particularly suitable.
  • a disadvantage of this process is the high need for solvents in the surface cleaning steps and extraction.
  • foils Due to the special properties of the foils with their high surface-to-volume ratio, cleaning is easy. However, foils are no longer contained to a large extent in the mixed plastics from the collection of the dual system.
  • the plastic mixture is introduced into an organic solvent in which at least one of the high molecular weight polymers is soluble at a specific temperature.
  • the specific temperature can be defined as the dissolving temperature at which at least one of the polymers contained in the plastic mixture is present in dissolved form in the presence of the organic solvent used in more than 10-50% by weight.
  • the solvent is kept at normal pressure at a working temperature at which none of the high molecular weight polymers is dissolved, a certain weight ratio of the plastic mixture to the solvent being set.
  • the low molecular weight constituents are then extracted during a certain dwell time, and the plastic mixture is then optionally removed from the solvent.
  • Granules are to be understood as meaning granules or agglomerates which can be obtained with the aid of the dry and wet processing methods mentioned above.
  • Granules and especially agglomerates are characterized by a high porosity or surface fissuring, so that surprisingly it is possible to extract low molecular weight kular polymers and other foreign substances with a satisfactory degree of purity.
  • Dissolving and phase separation ie taking advantage of the occurrence of at least two liquid phases, for separation in fractions of different polymer compositions.
  • the tremor steps exploit the fact that, when a plastic mixture is dissolved in an organic solvent, a mixture gap is created under certain conditions and two liquid phases are generated, which can be treated separately.
  • Liquid phase can also be selective be precipitated under shear or flow or with the addition of a precipitant.
  • This separation process can be carried out alone or in combination with the liquid-liquid phase separation.
  • a further separation method is a selective solution, which can also be carried out alone or in combination with precipitation under shear or flow or by adding a precipitant.
  • the combination of selective dissolution with the liquid-liquid phase separation can also be used alone or again in combination with the precipitation processes described above.
  • the solvent is removed after the extraction step and fresh solvent, either a chemically identical or non-identical one, is used for the subsequent separation into polymer fractions.
  • Suitable solvents are aliphatic, aromatic or cyclic, saturated or unsaturated hydrocarbons, alcohols, carboxylic acids, amines, esters, ketones, tetrahydrofuran, bimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone or mixtures thereof.
  • hexane or octane as a solvent is particularly preferred.
  • the solvent is preferably circulated, and when a limit concentration of low molecular weight polymers is reached in the solvent, the latter can be drawn off and purified by distillation. Fresh solvent is then returned for extraction.
  • the concentration of plastic mixture in the solvent can be about 10 to 20% by weight, depending on the composition of the plastic mixture and the type of solvent.
  • the working temperature is preferably kept in the range from 60 ° C to 70 ° C.
  • the dwell time should be between 60 and 90 minutes in order to clean up about 80% of the waxes.
  • Figure 1 is a schematic representation of the method according to the present invention.
  • Figure 2 is a plot of the wax concentration in the solvent over time.
  • Figure 1 shows schematically an extraction apparatus, which can be, for example, a carousel extractor operated by a motor.
  • the mixed plastic pellets for example consisting of polypropylene and polyethylene, are introduced into the solvent, for example hexane, in a certain weight ratio.
  • a slight relative movement of pellets to solvent is produced by stirring.
  • the solvent temperature is set to 60 to 70 ° C, preferably 65 ° C.
  • the extracted mixed plastic pellets are removed and, without desolventization, dissolved in a solvent kettle, which also contains hexane, for further processing. There is no longer any need for cleaning with hot water and subsequent drying.
  • the polymer fractions obtained after further separation can be readjusted by adding additives.
  • the solvent is normally circulated until a limit concentration of low molecular weight polymers is reached. Then the contaminated solvent is at least partially drawn off and purified by distillation, fresh solvent, preferably originating from the distillation, is filled up.
  • Figure 2 shows the increase in the wax concentration in the solvent with the passage of time. It can be seen that after about 40 minutes there is no substantial enrichment in wax, so that contaminated solvent should then be removed or fresh solvent added at the latest.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Sustainable Development (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

La présente invention concerne un procédé pour préparer un mélange de matières plastiques qui est constitué de polymères à haut poids moléculaire et qui est contaminé par des polymères à faible poids moléculaire et par d'autres impuretés. Ce procédé est caractérisé en ce qu'il consiste a) à introduire ledit mélange de matières plastiques dans un solvant organique dans lequel au moins un des polymères à haut poids moléculaire du mélange de matières plastiques peut être dissous à une température spécifique audit polymère, b) à maintenir le solvant sous une pression normale, à une température de marche à laquelle aucun des polymères à haut poids moléculaire n'est dissous, réglant alors un certain rapport de poids du mélange de matières plastiques sur le solvant, c) à extraire des composants à faible poids moléculaire au cours d'une certaine durée de séjour du mélange de matières plastiques dans le solvant, puis éventuellement d) à retirer le mélange de matières plastiques purifié du solvant.
EP01995592A 2000-12-15 2001-12-13 Procede pour preparer un melange de matieres plastiques Withdrawn EP1353983A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10062437 2000-12-15
DE2000162437 DE10062437A1 (de) 2000-12-15 2000-12-15 Verfahren zum Aufbereiten eines Kunststoffgemisches
PCT/DE2001/004704 WO2002048244A1 (fr) 2000-12-15 2001-12-13 Procede pour preparer un melange de matieres plastiques

Publications (1)

Publication Number Publication Date
EP1353983A1 true EP1353983A1 (fr) 2003-10-22

Family

ID=7667208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01995592A Withdrawn EP1353983A1 (fr) 2000-12-15 2001-12-13 Procede pour preparer un melange de matieres plastiques

Country Status (8)

Country Link
US (1) US20030146547A1 (fr)
EP (1) EP1353983A1 (fr)
JP (1) JP2004515624A (fr)
CN (1) CN1481413A (fr)
AU (1) AU2002226290A1 (fr)
BR (1) BR0116120A (fr)
DE (1) DE10062437A1 (fr)
WO (1) WO2002048244A1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062710A1 (de) * 2000-12-15 2002-06-20 Dkr Deutsche Ges Fuer Kunststo Herstellung eines Polypropylen-Blends
US9284431B2 (en) * 2012-02-14 2016-03-15 Clariant International Ltd. Method for recycling floor coverings
WO2017003803A1 (fr) * 2015-06-30 2017-01-05 The Procter & Gamble Company Articles en compositions de polyéthylène régénéré
WO2017003801A1 (fr) * 2015-06-30 2017-01-05 The Procter & Gamble Company Composition de polyéthylène recyclé
WO2017003800A1 (fr) * 2015-06-30 2017-01-05 The Procter & Gamble Company Composition de polypropylène recyclé
US10961368B2 (en) 2016-01-05 2021-03-30 Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. Process for treating plastic waste
CN105806790B (zh) * 2016-03-15 2019-02-19 通标标准技术服务有限公司广州分公司 一种塑料中六价铬的测定方法
EP3305839A1 (fr) * 2016-10-10 2018-04-11 Fraunhofer Gesellschaft zur Förderung der Angewand Procédé de recyclage de déchets contenant des polyoléfines
US10961366B2 (en) * 2018-06-20 2021-03-30 The Procter & Gamble Company Method for purifying reclaimed polymers
CN109880131B (zh) * 2019-01-25 2020-11-17 华中科技大学 一种离子液体增塑纤维素清洁制造方法
EP4136149A1 (fr) 2020-04-15 2023-02-22 The Procter & Gamble Company Réduction de la contamination de surface et de masse dans du plastique
US11180618B1 (en) * 2020-08-05 2021-11-23 Timeplast, Llc Process of transforming a plastic extrusion system into a dynamic depolymerization reactor
CN114058073A (zh) * 2020-08-07 2022-02-18 Apk股份公司 使用滚筒对滚筒加工步骤的基于溶剂的回收利用
US10954354B1 (en) * 2020-10-16 2021-03-23 Timeplast, Llc Upcycling process for unsorted waste stream
CN114434685B (zh) * 2020-10-30 2023-08-08 中国石油化工股份有限公司 浸取器及其应用、含pvc废塑料回收利用的装置及其方法
CN112497777A (zh) * 2020-11-27 2021-03-16 陈辉煌 一种可diy香薰蜡块制作装置
CH718174B1 (de) * 2020-12-16 2024-07-31 Alpla Werke Alwin Lehner Gmbh & Co Kg Recycling-Verfahren für verunreinigte Polyolefine.
CN112920494A (zh) * 2021-02-05 2021-06-08 保定风帆美新蓄电池隔板制造有限公司 一种用铅酸蓄电池pe隔板废料制备再生物的方法
CN118060299B (zh) * 2024-04-25 2024-06-21 湖南金阳石墨烯研究院有限公司 一种废弃电池负极石墨的回收方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198471A (en) * 1989-09-11 1993-03-30 Rensselaer Polytechnic Institute Polymer recycling by selective dissolution
US5554657A (en) * 1995-05-08 1996-09-10 Shell Oil Company Process for recycling mixed polymer containing polyethylene terephthalate
ES2225908T3 (es) * 1996-02-19 2005-03-16 Total Petrochemicals Research Feluy Procedimiento para clasificacion de polimeros.
US5994417A (en) * 1996-06-04 1999-11-30 Auburn University Process for recovering polymers from commingled materials
DE19744436A1 (de) * 1997-10-08 1999-04-15 Lindner Wolfgang Verfahren zur Gewinnung von polyolefinischen Kunststoffen
DE19822234A1 (de) * 1998-05-07 1999-11-18 Stefan Bosewitz Verfahren zur Trennung von Kunststoffen und deren Mischungen durch selektives Fällen aus Lösungen
DE19905029A1 (de) * 1999-01-29 2000-11-16 Bgb Ges Tu Berlin Verfahren zur Trennung vermischter Polyolefine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO0248244A1 *

Also Published As

Publication number Publication date
BR0116120A (pt) 2003-12-23
CN1481413A (zh) 2004-03-10
US20030146547A1 (en) 2003-08-07
AU2002226290A1 (en) 2002-06-24
JP2004515624A (ja) 2004-05-27
WO2002048244A1 (fr) 2002-06-20
DE10062437A1 (de) 2002-06-20

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