EP1353983A1 - Method for recovering mixed plastic matter - Google Patents
Method for recovering mixed plastic matterInfo
- 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- Withdrawn
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000162437 DE10062437A1 (en) | 2000-12-15 | 2000-12-15 | Process for preparing a plastic mixture |
DE10062437 | 2000-12-15 | ||
PCT/DE2001/004704 WO2002048244A1 (en) | 2000-12-15 | 2001-12-13 | Method for recovering mixed plastic matter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1353983A1 true EP1353983A1 (en) | 2003-10-22 |
Family
ID=7667208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01995592A Withdrawn EP1353983A1 (en) | 2000-12-15 | 2001-12-13 | Method for recovering mixed plastic matter |
Country Status (8)
Country | Link |
---|---|
US (1) | US20030146547A1 (en) |
EP (1) | EP1353983A1 (en) |
JP (1) | JP2004515624A (en) |
CN (1) | CN1481413A (en) |
AU (1) | AU2002226290A1 (en) |
BR (1) | BR0116120A (en) |
DE (1) | DE10062437A1 (en) |
WO (1) | WO2002048244A1 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10062710A1 (en) * | 2000-12-15 | 2002-06-20 | Dkr Deutsche Ges Fuer Kunststo | Production of a polypropylene blend |
US9284431B2 (en) * | 2012-02-14 | 2016-03-15 | Clariant International Ltd. | Method for recycling floor coverings |
WO2017003800A1 (en) * | 2015-06-30 | 2017-01-05 | The Procter & Gamble Company | Reclaimed polypropylene composition |
US20170002169A1 (en) * | 2015-06-30 | 2017-01-05 | The Procter & Gamble Company | Reclaimed Polyethylene Composition |
US20170002117A1 (en) * | 2015-06-30 | 2017-01-05 | The Procter & Gamble Company | Articles of Reclaimed Polypropylene Composition |
AU2017204940A1 (en) * | 2016-01-05 | 2018-08-23 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. | A process for treating plastic waste |
CN105806790B (en) * | 2016-03-15 | 2019-02-19 | 通标标准技术服务有限公司广州分公司 | The measuring method of Cr VI in a kind of plastics |
EP3305839A1 (en) * | 2016-10-10 | 2018-04-11 | Fraunhofer Gesellschaft zur Förderung der Angewand | Method for recycling polyolefin containing waste |
US10961366B2 (en) * | 2018-06-20 | 2021-03-30 | The Procter & Gamble Company | Method for purifying reclaimed polymers |
CN109880131B (en) * | 2019-01-25 | 2020-11-17 | 华中科技大学 | Clean manufacturing method of ionic liquid plasticized cellulose |
WO2021211646A1 (en) * | 2020-04-15 | 2021-10-21 | The Procter & Gamble Company | Reducing surface and bulk contamination in plastic |
US11180618B1 (en) * | 2020-08-05 | 2021-11-23 | Timeplast, Llc | Process of transforming a plastic extrusion system into a dynamic depolymerization reactor |
CN114058073A (en) * | 2020-08-07 | 2022-02-18 | Apk股份公司 | Solvent-based recycling of drum-to-drum processing steps using a drum |
US10954354B1 (en) * | 2020-10-16 | 2021-03-23 | Timeplast, Llc | Upcycling process for unsorted waste stream |
CN114434685B (en) * | 2020-10-30 | 2023-08-08 | 中国石油化工股份有限公司 | Leacher and application thereof, device for recycling waste plastics containing PVC and method thereof |
CN112497777A (en) * | 2020-11-27 | 2021-03-16 | 陈辉煌 | DIY aromatherapy wax block manufacturing device |
CH718174B1 (en) * | 2020-12-16 | 2024-07-31 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Recycling process for contaminated polyolefins. |
CN112920494A (en) * | 2021-02-05 | 2021-06-08 | 保定风帆美新蓄电池隔板制造有限公司 | Method for preparing regenerated substance by using waste PE (polyethylene) partition plate of lead-acid storage battery |
CN118060299B (en) * | 2024-04-25 | 2024-06-21 | 湖南金阳石墨烯研究院有限公司 | Recovery method of waste battery negative electrode graphite |
Family Cites Families (7)
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 (en) * | 1996-02-19 | 2005-03-16 | Total Petrochemicals Research Feluy | PROCEDURE FOR CLASSIFICATION OF POLYMERS. |
US5994417A (en) * | 1996-06-04 | 1999-11-30 | Auburn University | Process for recovering polymers from commingled materials |
DE19744436A1 (en) * | 1997-10-08 | 1999-04-15 | Lindner Wolfgang | Separation of polyolefin from polyolefinic polymer fraction or mixture |
DE19822234A1 (en) * | 1998-05-07 | 1999-11-18 | Stefan Bosewitz | Recovery of pure olefins from solution and separation of plastics with close precipitation temperatures |
DE19905029A1 (en) * | 1999-01-29 | 2000-11-16 | Bgb Ges Tu Berlin | Mixed polyolefin separation used for low density polyethylene and high density polyethylene in waste involves using lower alkane as solvent and different lower alkane as separation aid |
-
2000
- 2000-12-15 DE DE2000162437 patent/DE10062437A1/en not_active Withdrawn
-
2001
- 2001-01-13 US US10/220,690 patent/US20030146547A1/en not_active Abandoned
- 2001-12-13 EP EP01995592A patent/EP1353983A1/en not_active Withdrawn
- 2001-12-13 JP JP2002549770A patent/JP2004515624A/en active Pending
- 2001-12-13 BR BR0116120A patent/BR0116120A/en not_active Application Discontinuation
- 2001-12-13 WO PCT/DE2001/004704 patent/WO2002048244A1/en active Application Filing
- 2001-12-13 CN CNA018206360A patent/CN1481413A/en active Pending
- 2001-12-13 AU AU2002226290A patent/AU2002226290A1/en not_active Abandoned
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO0248244A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004515624A (en) | 2004-05-27 |
CN1481413A (en) | 2004-03-10 |
WO2002048244A1 (en) | 2002-06-20 |
AU2002226290A1 (en) | 2002-06-24 |
US20030146547A1 (en) | 2003-08-07 |
BR0116120A (en) | 2003-12-23 |
DE10062437A1 (en) | 2002-06-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1353983A1 (en) | Method for recovering mixed plastic matter | |
DE10062710A1 (en) | Production of a polypropylene blend | |
DE69026829T2 (en) | POLYMER RECYCLING THROUGH SELECTIVE RESOLUTION | |
EP1189979B1 (en) | Method of separating polyolefinic synthetic mixtures | |
DE602005003814T2 (en) | PROCESS FOR SOLVENT TREATMENT OF A PLASTIC | |
DE60012778T2 (en) | METHOD FOR RE-USING OBJECTS FROM VINYL POLYMERS | |
DE60121948T2 (en) | SOLVENT-BASED RECOVERY AND RECYCLING OF A POLYAMIDE MATERIAL | |
DE2537297A1 (en) | METHOD FOR RECOVERING POLYVINYL CHLORIDE MATERIALS FROM WASTE | |
DE19653076A1 (en) | Process for the recovery of polyolefins from polyolefin-containing plastic mixtures or polyolefin-containing waste | |
EP0521418A1 (en) | Method for pretreatment of old polyolefinic objects, to be used as recycled raw material | |
DE602005005721T2 (en) | METHOD FOR REMOVING HEAVY METALS FROM VINYL CHLORIDE POLYMERS (PVC) | |
EP3016998B1 (en) | Method for increasing the concentration of at least one polymer from a polymer-containing waste material, and polymer recyclate | |
DE112012006987T5 (en) | Process for producing non-carcinogenic aromatic process oil | |
DE2602322A1 (en) | PROCESS FOR CONTINUOUS SEPARATION AND RECOVERY OF HALOGEN SUBSTITUTED INSULATION MATERIAL FROM WASTE INSULATED WIRE MATERIAL | |
EP1392766A1 (en) | Method for obtaining ldpe from used plastic films | |
DE4207370A1 (en) | Removal of plant protectants from plastic esp. polyethylene@ containers - by extn. of plant protectant by contacting container with material which diffuses into plastic and dissolves protectant, etc. | |
DE69220665T2 (en) | GET TREATMENT AND RECOVERY OF OVERSPRAY WHEN SPRAYING ON WATER-SOLUBLE COATINGS | |
EP0608454B1 (en) | Process and apparatus for producing polyamide-6 from polyamide waste | |
EP3003669B1 (en) | Method for recovering raw materials from paper-containing wastes by means of ionic liquids | |
EP2981559B1 (en) | Method for separation of a polymer from a polymer solution or dispersion | |
DE2449303A1 (en) | PROCESS FOR CONTINUOUS SEPARATION AND RECOVERY OF HALOGEN-SUBSTITUTED INSULATING MATERIAL FROM WASTE INSULATED WIRE MATERIAL | |
WO2002048245A1 (en) | Method for separating at least one selected polymer from a mixture of polymers | |
EP1200514A1 (en) | Thermal separation method for mixed polymers | |
DE102021203708B3 (en) | Process and device for the recycling of Low Density Polyethylene (LDPE) | |
DE1720081A1 (en) | Process for the production of finely divided stereospecific styrene-butadiene copolymers |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
REG | Reference to a national code |
Ref country code: HK Ref legal event code: DE Ref document number: 1058683 Country of ref document: HK |
|
17P | Request for examination filed |
Effective date: 20020705 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AXIVA GMBH & CO. KG Owner name: SEA WAY REFINING BV |
|
17Q | First examination report despatched |
Effective date: 20051214 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20080701 |
|
REG | Reference to a national code |
Ref country code: HK Ref legal event code: WD Ref document number: 1058683 Country of ref document: HK |