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WO2025087786A1 - Procédé de recyclage de polyoléfines - Google Patents

Procédé de recyclage de polyoléfines Download PDF

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Publication number
WO2025087786A1
WO2025087786A1 PCT/EP2024/079376 EP2024079376W WO2025087786A1 WO 2025087786 A1 WO2025087786 A1 WO 2025087786A1 EP 2024079376 W EP2024079376 W EP 2024079376W WO 2025087786 A1 WO2025087786 A1 WO 2025087786A1
Authority
WO
WIPO (PCT)
Prior art keywords
entraining agent
melt
extruder
contaminants
entraining
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.)
Pending
Application number
PCT/EP2024/079376
Other languages
German (de)
English (en)
Inventor
Michael Heyde
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.)
Alpla Werke Alwin Lehner GmbH and Co KG
Original Assignee
Alpla Werke Alwin Lehner 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
Priority claimed from CH001199/2023A external-priority patent/CH721251A1/de
Application filed by Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Publication of WO2025087786A1 publication Critical patent/WO2025087786A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • 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
    • 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
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/145—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration at a venting zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/762—Vapour stripping
    • 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
    • B29B2013/002—Extracting undesirable residual components, e.g. solvents, unreacted monomers, from material to be moulded
    • 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
    • B29B2013/005—Degassing undesirable residual components, e.g. gases, unreacted monomers, from material to be moulded
    • 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
    • B29B2017/0286—Cleaning means used for separation
    • 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 process for recycling contaminated polyolefin material.
  • Analogous processes are also known in which, instead of a vacuum, a fluid, in particular nitrogen, CO2 or steam, is drawn through the material for purification in front of the extruder.
  • a fluid in particular nitrogen, CO2 or steam
  • Processes with a degassing screw are also known, which degas the melt directly in the extruder or in a downstream melt reactor with vacuum and thus degas volatile components very quickly. These processes are limited by the effective surface area that can be used for degassing and the time available for degassing.
  • Recycling processes using solvents are known that purify the polymer by swelling and pressing, or by deliberately dissolving and precipitating it. Polymers in the swollen state can have much higher migration properties and thus decontamination properties.
  • the invention is preferably characterized in that the purification step (V) is carried out by contacting or mixing the melt with an entraining agent, and the contaminants are separated from the melt together with the entraining agent as a loaded entraining agent.
  • the entraining agent can act in the melt phase of the polymer. This allows contaminants to be removed together with the entraining agent, which would otherwise be difficult or impossible to remove from the melt. are separable from the polyolefin material.
  • the entraining agent can reduce the contamination by at least 90% of the initial concentration. This generally meets the EFSA's requirements regarding key contaminants, depending on the initial contamination. Since tris(2-ethylhexyl) trimellitate has a particularly high molar mass of 547 g/mol, up to a maximum of 30% can be removed from the polyolefin material using state-of-the-art separation processes.
  • sequence of process steps (I) to (VII) is preferably carried out in ascending order. It is also conceivable that the process steps are carried out in a different order.
  • the polyolefin polymer may also be in a form that prevents or complicates decontamination and is facilitated or even made possible by the melt entraining agent.
  • the polyolefin material is undissolved in the entraining agent and, accordingly, a material phase and an entraining agent phase (layered or in domains) are present during the purification step (V).
  • the entraining agent can be separated from the melt again with little effort by degassing in the extruder and tears during degassing or During the pressing process, a large portion of the contaminants are transferred from the melt into the gas phase.
  • cleaning agents that dissolve the polyolefin material must be separated from the target polymer using complex processes, such as a membrane process.
  • the invention is preferably characterized in that the extruder is operated or constructed in such a way that the volume of the extruder is, at least in some areas, larger than the volume of the melt containing the entraining agent, and that the free volume thus obtained is provided with a vacuum to separate the contaminants and the entraining agent from the melt.
  • the free volume can be achieved, for example, by varying the conveying speeds and passage volumes of an extruder or by varying the speeds of melt pumps.
  • the extruder volume can preferably be smaller than the melt containing the entraining agent, at least in some areas, to ensure extrusion of the melt and separation of the loaded entraining agent.
  • a compression process can also be additionally connected downstream of the extruder.
  • the entraining agent is added to the material in a static or dynamic mixer upstream or downstream of the extruder by mixing the flakes or melt with the entraining agent.
  • This allows the polyolefin material to swell in the mixer, which can improve decontamination.
  • the mixing of the polyolefin material with the entraining agent can take place in a mixer in addition to mixing in an extruder or instead of mixing in an extruder.
  • the melt surface loaded with contaminants is enlarged by the entraining agent, preferably by the entraining agent forming pores in the melt. Separation of contaminants under vacuum or pressing is improved by the larger surface area, as explained below.
  • melts and cavities in the melt increase the surface area to the vacuum created during degassing. The larger the melt surface area during degassing, the more effective it is.
  • Entraining agents which increase the melt surface area, support degassing.
  • the entraining agent and the contaminants in these pores are thus more easily accessible to the vacuum, and any remaining contaminants in the melt are easier to remove after the entraining agent has been separated from the pores due to the vacuum-open structure.
  • the bursting of individual or all pores due to a pressure difference can also be specifically exploited.
  • Entrainers which create pores and cavities in a melt, also assist in removing the entrainer and contaminants during the pressing process, similar to a sponge.
  • surface area is important for removing contaminants during pressing. The larger the surface area during pressing, the better.
  • melt-swelling entraining agents such as hexane or heptane, which are brought into contact with the polyolefin melt, promote the migration of contaminants to the surface, as the swollen polymer releases more contaminants during devolatilization than without swelling. Even larger molecules that would otherwise not be released can be transported away by the entraining agent due to the increased molecular spacing of the swollen polymer.
  • the entraining agent can have both a swelling and a pore-forming effect on the polymer melt.
  • the invention is also preferably characterized in that the separated contaminant-laden entrainer is purified and returned to the extruder and/or mixer as treated entrainer. This minimizes entrainer consumption, making the decontamination process efficient and cost-effective.
  • the entraining agent is heptane or hexane and is brought into contact with the melt in an amount of 3 to 9 times, and preferably 3 to 7 times, the weight of the melt, causing the polyolefin material to swell. In this embodiment, decontamination is further improved by the swelling of the melt.
  • the entraining agent is polar, particularly water, and the polar entraining agent transports contaminants from the melt to the melt surface during phase separation. Due to the lack of compatibility, the water always strives for the surface of the melt and entrains contaminants. At the surface, it evaporates in the vacuum zones of the extruder or mixer. Contaminants that are soluble in water (e.g., formaldehyde) and those that are not readily soluble in water (mineral oil) are flushed out of the polymer during phase separation and entrained into the gas space during evaporation. This occurs even if the evaporation temperature of the contaminants has not yet been reached under the prevailing pressure conditions.
  • the polar entraining agent transports contaminants from the melt to the melt surface during phase separation. Due to the lack of compatibility, the water always strives for the surface of the melt and entrains contaminants. At the surface, it evaporates in the vacuum zones of the extruder or mixer. Contaminants that are soluble in water (e.g., formalde
  • the entraining agent is dry ice, which, when used, gives the melt a porous or foamed structure, and the sublimating dry ice entrains the contaminants into the gas phase.
  • the sublimation of the dry ice is utilized to transfer contaminants into the gas phase, where they are expelled either by degassing alone or with the additional support of a pressing process.
  • the purified melt is granulated in a granulation process. Thanks to the use of a melt entraining agent, the recycled granulate has very good quality, comparable to that of virgin granulate.
  • Figure 1 a flow diagram of a process according to the invention for recycling polyolefins in a first embodiment
  • Figure 2 a flow diagram of the process according to the invention for recycling polyolefins in a second embodiment.
  • Figure 1 shows a flow diagram of the inventive process for recycling polyolefin material.
  • the entraining agent is therefore a melt entraining agent and can also be considered a type of extraction agent.
  • Melt entrainers are deliberately added substances that accelerate the transfer of contamination during polymer devolatilization or polymer compression, or even enable it in the first place. During devolatilization, entrainers largely leave the polymer. The long residence time at high temperatures required by current technology, which promotes cluster formation of polyolefins, can be prevented or at least reduced by entraining agents.
  • the entraining agent allows specific contaminants whose molecular weights are too high to be removed at low melt temperatures or are not present in gaseous form to be removed along with the entraining agent. Even if the polyolefin is in a form that prevents or complicates decontamination, the entraining agent can facilitate decontamination.
  • a first rotary valve 2 conveys the washed, pre-cleaned, and sorted flakes a from a flake reservoir 1 into a flake buffer 3.
  • volatile contaminants are sucked into an exhaust air treatment system 18 using a first vacuum pump 4.
  • a second rotary valve 5 conveys the pre-cleaned flakes into a heated pressure vessel 6 equipped with a stirrer.
  • the flakes are brought into contact with an entraining agent under pressure, producing a mixture b of flakes and entraining agent.
  • the mixture is converted in the pressure vessel into a polymer sponge c with the entraining agent in its pores.
  • the polymer sponge c is fed under overpressure in a closed system to the extruder 8.
  • the polymer sponge c can be mixed with an additive package h, which can in particular contain fresh, unused stabilizers and colors for color compensation.
  • the additive package h can be a subsequent melting phase ( Figure 2). It is also possible to add the additive package separately to a granulate processing machine, e.g., in an extrusion plant for films, pipes, or bottles.
  • Figure 2 shows a flow diagram of a second embodiment of the process with a second extruder 20.
  • the additive package h is added to the melt phase of the second extruder 20.
  • purification takes place first in the first extruder 8, and a second extrusion step (second extruder 20) is provided for additive addition.
  • the entraining agent can cause structural changes in the melt, in particular pore formation, domain formation, bubble formation, layer formation, sponge formation or be present homogeneously as a solution in the melt.
  • Stabilizers may be too degraded in the polymer, the dosage may be too low, or the wrong stabilizers may be present in the recycled material.
  • New, suitable, adapted, and still active stabilizers are added to the stabilizer package. "New” means that they have not yet reacted with oxygen or radicals. "Suitable” means that they are not immediately removed by the vacuum in the degassing process and are suitable for use and further recycling steps. "Adapted” means that there is a missing quantity, since virgin material often requires very little stabilizer, but larger quantities are often needed in recycling due to the higher temperatures and residence times.
  • the color of the regranulate is usually not identical to the new product; a color correction package may be included in the additive package in addition to the stabilizer package.
  • extruder 8 the flakes are melted, and the melt is degassed under vacuum.
  • the volume of extruder 8 is deliberately kept larger in certain areas than the volume required by the melt with the entraining agent.
  • the free volume can be achieved, for example, by varying the conveying speeds and passage volumes of an extruder or by varying the speeds of melt pumps.
  • the free volume is subjected to a vacuum, which separates the entraining agent and its contaminants from the melt.
  • the purified melt g is passed through a filter 9 to remove solid contaminants.
  • the melt is converted into granules or pellets in a granulation unit 10.
  • the entraining agent can also be melt-swelling, which improves the removal of contaminants.
  • the extruder volume can be smaller, at least in some areas, than the melt containing the entraining agent to allow for extrusion of the melt and separation of the loaded entraining agent, or a compression process can be additionally installed downstream of the extruder.
  • the swollen polyolefin is pressed out during separation of the entraining agent to remove any remaining entraining agent.
  • the entraining agent is conducted in a separate circuit in order to reuse as much of the entraining agent as possible and to remove as much contaminant as possible.
  • the loaded entraining agent e is fed to a treatment unit 14.
  • a treatment unit 14 In addition to a condensation column, membrane filtration, a semipermeable membrane, selective precipitation, or chromatographic separation can be used for treatment. Other treatment methods are also conceivable.
  • the residues k or separated contaminants from the entraining agent are disposed of.
  • the treated entraining agent is mixed with fresh entraining agent d to compensate for entraining agent losses.
  • a pump 16 returns the treated entraining agent f to the pressure vessel 6, and an overpressure is built up in the pressure vessel.
  • the granulate is fed to a granulate cooler 13 via a third rotary valve 12.
  • the granulate is cooled by purging and cooling air blown into the granulate cooler 13, removing any remaining contaminants and then fed to the exhaust air treatment 18 as contaminated exhaust air h.
  • the finally purified granulate m can be removed from the granulate cooler.
  • the three degassing streams collected in the exhaust air treatment 18 are purified in the exhaust air treatment 18, and purified exhaust air j can be removed.
  • Melt-swelling entrainers such as hexane or heptane in polyolefins promote the migration of contaminants to the surface, as the swollen polymer releases more contaminants during devolatilization than without swelling. Even larger molecules that would otherwise not be released can be removed by the entrainer due to the larger molecular spacing in the swollen polymer. According to the
  • Melt-incompatible entraining agents such as polar water
  • a non-polar polymer such as polypropylene
  • the polar water strives for phase separation and collects on the melt surface as soon as no mixing and shearing elements repeatedly stir the water into the material. Due to the lack of compatibility, the water strives for the surface of the melt and entrains contaminants from the polypropylene (PP) with it. At the surface, it evaporates in the vacuum zones of the extruder or mixer. Water-soluble contaminants (e.g. formaldehyde) and those that are not easily soluble in water (mineral oil) are flushed out of the polymer during phase separation and entrained into the gas space during evaporation, even if they would not evaporate at the temperature.
  • An example of an entraining variant is the addition and dispersing of 1 to 3 wt.% water vapor in the melt volume of a PP melt.
  • melt-compatible entrainers such as hexane or heptane, dissolve contaminants such as butyric acid in HDPE. Due to its lower solubility, the entrainer is repelled by the polymer matrix upon cooling and quickly reaches the surface, where it is separated as a separate phase. Melt-compatible entrainers are generally also swellable. Therefore, it is usually advisable to press out the supercooled melt to separate even more entrainer. According to the third example, 300 to 700 wt.% of the melt volume of heptane is brought into contact with an HDPE melt. 4.
  • Entraining agents are deliberately used to achieve a porous or foamed melt consistency and surface, allowing contaminants to immediately enter the gas phase and be removed via vacuum.
  • 0.5 to 5 wt% of dry ice is added to the melt volume of a PP melt. The dry ice sublimates and draws the contaminants along with it.
  • Entraining agents are used deliberately to change the viscosity of the polyolefin, allowing the polyolefin to form thinner interfaces in the vented extruder and allowing contaminants to leave the polyolefin more quickly due to the lower viscosity of the polyolefin.
  • 0.3 to 3 wt% of the melt volume of heptane is used to significantly reduce the viscosity of an LLDPE melt.
  • Washed bottle-grade HDPE flakes (MFI: 0.02 - 10 g/10 min; 190 °C; 2.16 kg; DIN ISO 1133) are melted in a vented extruder at 250 °C. Volatile contaminants are removed by vacuum, while solid contaminants are removed by melt filtration. Instead of underwater pelletizing, the melt is swollen in a mixer with the entraining agent heptane (in a ratio of 1 part by weight HDPE to 7 parts by weight heptane) at 130 °C, and the swollen HDPE is pumped into a cooling tank by a melt pump.
  • heptane in a ratio of 1 part by weight HDPE to 7 parts by weight heptane
  • Second extruder a Pre-cleaned flakes, polyolefin material b Mixture of flakes and entrainer c Polymer sponge with liquid solvent in the pores, d Fresh entrainer e Loaded entrainer f Recycled entrainer g Cleaned melt with residual entrainer h Additives, fresh stabilizer package j Cleaned exhaust air k Residues I Purging and cooling air m Cleaned granulate

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

L'invention concerne un procédé de recyclage d'une matière polyoléfinique mélangée à des contaminants, le procédé comprenant les étapes de procédé suivantes : (I) tri de matériaux ; (II) broyage fin des matériaux pour former des flocons ; (III) lavage des flocons ; (IV) tri des flocons ; (V) étape de nettoyage ; (VI) fusion des flocons ; et (VII) extrusion de la masse fondue dans une extrudeuse (8). L'étape de nettoyage (V) est effectuée de telle sorte que la masse fondue (c) est amenée en contact avec un agent d'entraînement (d) ou mélangée avec celui-ci et les contaminants sont retirés de la masse fondue conjointement avec l'agent d'entraînement en tant qu'agent d'entraînement chargé (e).
PCT/EP2024/079376 2023-10-27 2024-10-17 Procédé de recyclage de polyoléfines Pending WO2025087786A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH001199/2023A CH721251A1 (de) 2023-10-27 2023-10-27 Verfahren zum Recycling von Polyolefinen
CHCH001199/2023 2023-10-27
CH001387/2023A CH721255A2 (de) 2023-10-27 2023-12-12 Verfahren zum Recycling von Polyolefinen
CHCH001387/2023 2023-12-12

Publications (1)

Publication Number Publication Date
WO2025087786A1 true WO2025087786A1 (fr) 2025-05-01

Family

ID=93100466

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/079376 Pending WO2025087786A1 (fr) 2023-10-27 2024-10-17 Procédé de recyclage de polyoléfines

Country Status (1)

Country Link
WO (1) WO2025087786A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0838318A2 (fr) * 1996-10-25 1998-04-29 Praxair Technology, Inc. Procédé pour éliminer des contaminants des matières polymériques
US20210324170A1 (en) * 2020-04-15 2021-10-21 The Procter & Gamble Company Reducing surface and bulk contamination in plastic
WO2022015529A1 (fr) * 2020-07-15 2022-01-20 Dow Global Technologies Llc Procédé d'élimination des contaminants d'un thermoplastique contaminé
US20220040889A1 (en) * 2018-09-17 2022-02-10 Impact Laboratories Limited Plastic Recycling Process
US20220356323A1 (en) * 2021-05-07 2022-11-10 Braskem S.A. Systems and methods for recycling polyolefins

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0838318A2 (fr) * 1996-10-25 1998-04-29 Praxair Technology, Inc. Procédé pour éliminer des contaminants des matières polymériques
US20220040889A1 (en) * 2018-09-17 2022-02-10 Impact Laboratories Limited Plastic Recycling Process
US20210324170A1 (en) * 2020-04-15 2021-10-21 The Procter & Gamble Company Reducing surface and bulk contamination in plastic
WO2022015529A1 (fr) * 2020-07-15 2022-01-20 Dow Global Technologies Llc Procédé d'élimination des contaminants d'un thermoplastique contaminé
US20220356323A1 (en) * 2021-05-07 2022-11-10 Braskem S.A. Systems and methods for recycling polyolefins

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