CA2133214C - Process for the removal of foreign materials from a post-consumer polyethylene terephthalate feed stream - Google Patents

Process for the removal of foreign materials from a post-consumer polyethylene terephthalate feed stream Download PDF

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Publication number
CA2133214C
CA2133214C CA 2133214 CA2133214A CA2133214C CA 2133214 C CA2133214 C CA 2133214C CA 2133214 CA2133214 CA 2133214 CA 2133214 A CA2133214 A CA 2133214A CA 2133214 C CA2133214 C CA 2133214C
Authority
CA
Canada
Prior art keywords
liquid
polyethylene terephthalate
foreign materials
poise
pet
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.)
Expired - Fee Related
Application number
CA 2133214
Other languages
English (en)
French (fr)
Other versions
CA2133214A1 (en
Inventor
Eugene J. Burkett
Randy S. Jenks
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.)
M&G Polimeri Italia SpA.
Original Assignee
M&G Polimeri Italia SpA.
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 M&G Polimeri Italia SpA. filed Critical M&G Polimeri Italia SpA.
Publication of CA2133214A1 publication Critical patent/CA2133214A1/en
Application granted granted Critical
Publication of CA2133214C publication Critical patent/CA2133214C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88—Post-polymerisation treatment
    • C08G63/90—Purification; Drying
    • 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
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
    • C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
    • C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting 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
    • 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
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00168—Controlling or regulating processes controlling the viscosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00171—Controlling or regulating processes controlling the density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00761—Details of the reactor
    • B01J2219/00763—Baffles
    • B01J2219/00765—Baffles attached to the reactor wall
    • B01J2219/0077—Baffles attached to the reactor wall inclined
    • B01J2219/00772—Baffles attached to the reactor wall inclined in a helix
    • 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
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
    • B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
    • 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
    • B29B2017/0255—Specific separating techniques using different melting or softening temperatures of the materials to be separated
    • B29B2017/0258—Specific separating techniques using different melting or softening temperatures of the materials to be separated using heated surfaces for selective softening or melting of at least one plastic ingredient
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Environmental & Geological Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polyethers (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
CA 2133214 1992-03-31 1993-03-24 Process for the removal of foreign materials from a post-consumer polyethylene terephthalate feed stream Expired - Fee Related CA2133214C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US860,963 1992-03-31
US07/860,963 US5223544A (en) 1992-03-31 1992-03-31 Process for the removal of foreign materials from a post-consumer plyethylene terephthalate feed stream
PCT/EP1993/000737 WO1993020125A2 (en) 1992-03-31 1993-03-24 Process for the removal of foreign materials from a post-consumer polyethylene terephthalate feed stream

Publications (2)

Publication Number Publication Date
CA2133214A1 CA2133214A1 (en) 1993-10-14
CA2133214C true CA2133214C (en) 2003-10-14

Family

ID=25334501

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2133214 Expired - Fee Related CA2133214C (en) 1992-03-31 1993-03-24 Process for the removal of foreign materials from a post-consumer polyethylene terephthalate feed stream

Country Status (11)

Country Link
US (1) US5223544A (OSRAM)
EP (1) EP0637326B1 (OSRAM)
JP (1) JP3459919B2 (OSRAM)
KR (1) KR100245206B1 (OSRAM)
AU (1) AU671109B2 (OSRAM)
BR (1) BR9306156A (OSRAM)
CA (1) CA2133214C (OSRAM)
DE (1) DE69329279T2 (OSRAM)
ES (1) ES2149810T3 (OSRAM)
TW (1) TW237463B (OSRAM)
WO (1) WO1993020125A2 (OSRAM)

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US5504121A (en) * 1992-05-18 1996-04-02 Swig Pty Ltd. Polyethylene terephthalate decontamination
US5602187A (en) * 1992-05-18 1997-02-11 Swig Pty Ltd. Polyethylene terephthalate decontamination
EP0707562B1 (en) * 1993-07-05 2000-04-26 E.I. Du Pont De Nemours And Company Production of dicarboxylic acids
DE4410672C2 (de) * 1994-03-26 1996-04-04 Christian O Schoen Verfahren zur Wiederverwertung von Kunststoff
DE4428355A1 (de) * 1994-05-20 1996-02-15 Veba Oel Ag Vorrichtung zur Depolymerisation von Alt- und Abfallkunststoffen
DE4417721A1 (de) * 1994-05-20 1995-11-23 Veba Oel Ag Vorrichtung zur Depolymerisation von Alt- und Abfallkunststoffen
US5468780A (en) * 1994-06-21 1995-11-21 Miyaso Chemical Co. Method of recycling unsaturated polyester resin waste
US5559159A (en) * 1995-12-07 1996-09-24 Eastman Chemical Company Process including depolymerization in polyester reactor for recycling polyester materials
US6284808B1 (en) * 1997-02-03 2001-09-04 Illinois Tool Works Inc. Inline solid state polymerization of PET flakes for manufacturing plastic strap by removing non-crystalline materials from recycled PET
US5945460A (en) * 1997-03-20 1999-08-31 Eastman Chemical Company Process for continuously producing polyester articles with scrap recycle in a continuous melt-to-preform process
JP3715812B2 (ja) * 1998-12-10 2005-11-16 株式会社アイエス ポリエチレンテレフタレート廃棄物のケミカルリサイクル方法
US6410607B1 (en) 1999-02-10 2002-06-25 Eastman Chemical Company Glycolysis process for recycling of post-consumer pet
US7666368B2 (en) * 2002-09-27 2010-02-23 Meishin Kogyo Kabushikigaisha Apparatus for treating volume-reduced polystyrene resin in gel state for material separation and recovery
TWI311572B (en) * 2002-09-27 2009-07-01 Shigenobu Haman Apparatus for treating volume-reduced polystyrene resin in gel state for material separation and recovery
US7297721B2 (en) * 2003-06-20 2007-11-20 Futura Polyesters Limited Process for controlled polymerization of a mixed polymer
ITTP20030002A1 (it) * 2003-10-09 2005-04-10 Giovanni Maurizio Di Processo ossidoriduzione per riciclare qualsiasi frazione rifiuto:fanghi, scarti industriali, agroalimentari, macellazione, ittici, ecc. in biostabilizzato sterile e/o polixano espanso isolante termoacustico, in innovativo impianto mobile o fisso con
JP2005132901A (ja) * 2003-10-29 2005-05-26 Teijin Fibers Ltd 脂肪族ポリエステルから異素材を除去する方法
JP2005131856A (ja) * 2003-10-29 2005-05-26 Teijin Fibers Ltd 脂肪族ポリエステルから異素材を除去する方法
WO2010137756A1 (en) * 2009-05-28 2010-12-02 Byung Kyoo Park Method and apparatus for recycling thermoplastic resin from a resin mixture
WO2012115984A2 (en) 2011-02-21 2012-08-30 Felice Kristopher M Polyurethane dispersions and methods of making and using same
US20120279023A1 (en) * 2011-05-06 2012-11-08 Avery Dennison Corporation Plastic Fastening Device Comprising a Recycled Thermoplastic Resin
JP2014520008A (ja) 2011-06-10 2014-08-21 フェリス、クリストファー、エム． 透明アクリルコーティング
KR102116052B1 (ko) * 2012-08-29 2020-05-27 도요보 가부시키가이샤 열수축성 폴리에스테르계 필름
US9732026B2 (en) 2012-12-14 2017-08-15 Resinate Technologies, Inc. Reaction products containing hydroxyalkylterephthalates and methods of making and using same
KR102090218B1 (ko) * 2018-05-23 2020-03-17 주식회사 포스코 탕도
US20220372217A1 (en) 2019-10-08 2022-11-24 Eastman Chemical Company Catalyst systems for crystallizable reactor grade resins with recycled content
BR112022007592A2 (pt) 2019-10-25 2022-07-05 Eastman Chem Co Processo para produzir uma composição de poliéster, filme retrátil, filme vazio, artigo moldado, artigo termoformável, filme ou folha extrudada, filme soprado, artigo moldado por extrusão por sopro, e, método para introduzir ou estabelecer conteúdo de reciclagem em um poliéster
NL2024181B1 (en) * 2019-11-07 2021-07-20 Ioniqa Tech B V Reactor system and method of separating a first contaminant from a feed stream
US12013191B2 (en) * 2020-10-20 2024-06-18 Katz Water Tech, Llc Coiled spring
CN113351140B (zh) * 2021-06-23 2022-10-18 山东佳星环保科技有限公司 高分散全混流反应釜
ES2987879T3 (es) 2022-09-20 2024-11-18 Revalyu Resources Gmbh Proceso para reciclar tereftalato de polietileno utilizando un reactor de lavado
EP4342938B1 (en) 2022-09-20 2024-07-17 revalyu Resources GmbH Process for recycling polyethylene terephthalate using specific colour coordinates for oligomer processing
EP4342943B1 (en) 2022-09-20 2024-07-17 revalyu Resources GmbH Process for recycling polyethylene terephthalate using a selected feedstock
EP4342945B1 (en) 2022-09-20 2024-07-17 revalyu Resources GmbH Process for recycling polyethylene terephthalate using different mono-ethylene glycol levels
NL2034769B1 (en) 2023-05-05 2024-11-21 Ioniqa Tech B V Method of recycling waste material comprising condensation polymer and other materials

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US3652466A (en) * 1968-07-16 1972-03-28 Du Pont Process of recovering polyester from polyester films having polymeric coatings
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US3701741A (en) * 1971-02-01 1972-10-31 Eastman Kodak Co Purification of impure scrap poly(ethylene terephthalate)
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US4542239A (en) * 1981-11-18 1985-09-17 Board Of Control Of Michigan Technological University Process for recovering terephthalic acid from waste polyethylene terephthalate
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US4746422A (en) * 1985-07-26 1988-05-24 Rutgers University Method for the separation of a mixture of plastic and contaminant
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Also Published As

Publication number Publication date
TW237463B (OSRAM) 1995-01-01
JP3459919B2 (ja) 2003-10-27
KR100245206B1 (ko) 2000-02-15
WO1993020125A2 (en) 1993-10-14
BR9306156A (pt) 1998-06-23
US5223544A (en) 1993-06-29
EP0637326A1 (en) 1995-02-08
ES2149810T3 (es) 2000-11-16
JPH07505424A (ja) 1995-06-15
CA2133214A1 (en) 1993-10-14
EP0637326B1 (en) 2000-08-23
AU3752493A (en) 1993-11-08
AU671109B2 (en) 1996-08-15
DE69329279D1 (de) 2000-09-28
WO1993020125A3 (en) 1994-04-14
KR950700954A (ko) 1995-02-20
DE69329279T2 (de) 2001-04-26

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