NZ517832A - Process for preparing food contact grade polyethylene terephthalate resin from waste pet containers - Google Patents
Process for preparing food contact grade polyethylene terephthalate resin from waste pet containersInfo
- Publication number
- NZ517832A NZ517832A NZ517832A NZ51783200A NZ517832A NZ 517832 A NZ517832 A NZ 517832A NZ 517832 A NZ517832 A NZ 517832A NZ 51783200 A NZ51783200 A NZ 51783200A NZ 517832 A NZ517832 A NZ 517832A
- Authority
- NZ
- New Zealand
- Prior art keywords
- pet
- flakes
- process according
- materials
- millibar
- Prior art date
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 title description 83
- 239000005020 polyethylene terephthalate Substances 0.000 title description 83
- 229920005989 resin Polymers 0.000 title description 10
- 239000011347 resin Substances 0.000 title description 10
- -1 polyethylene terephthalate Polymers 0.000 title description 8
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000000356 contaminant Substances 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 239000004094 surface-active agent Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000012768 molten material Substances 0.000 claims abstract description 4
- 239000012736 aqueous medium Substances 0.000 claims abstract description 3
- 239000008188 pellet Substances 0.000 claims description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 239000004970 Chain extender Substances 0.000 claims description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- HPEUJPJOZXNMSJ-UHFFFAOYSA-N Methyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC HPEUJPJOZXNMSJ-UHFFFAOYSA-N 0.000 claims description 4
- VNZQQAVATKSIBR-UHFFFAOYSA-L copper;octanoate Chemical compound [Cu+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O VNZQQAVATKSIBR-UHFFFAOYSA-L 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- CAMHHLOGFDZBBG-UHFFFAOYSA-N epoxidized methyl oleate Natural products CCCCCCCCC1OC1CCCCCCCC(=O)OC CAMHHLOGFDZBBG-UHFFFAOYSA-N 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 4
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims 1
- 239000012965 benzophenone Substances 0.000 claims 1
- 238000013508 migration Methods 0.000 claims 1
- 230000005012 migration Effects 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000155 melt Substances 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- 238000013022 venting Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 235000013361 beverage Nutrition 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005202 decontamination Methods 0.000 description 3
- 230000003588 decontaminative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 125000001309 chloro group Chemical group Cl* 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 239000012632 extractable Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 description 1
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 235000012174 carbonated soft drink Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- WYMSBXTXOHUIGT-UHFFFAOYSA-N paraoxon Chemical compound CCOP(=O)(OCC)OC1=CC=C([N+]([O-])=O)C=C1 WYMSBXTXOHUIGT-UHFFFAOYSA-N 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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
- B29B17/02—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
-
- 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
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
-
- 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
- B29B2017/0203—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
- B29B2017/0286—Cleaning means used for separation
- B29B2017/0289—Washing the materials 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
- B29B2017/0293—Dissolving the materials in gases or liquids
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- 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
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
-
- 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)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
A process for preparing food contact grade PET from a waste stream containing PET and non-PET materials is disclosed. The process involves the steps of sorting at least some of the non PET materials from the waste stream, followed by dividing the PET containers into flakes of preferable maximum size approximately 10mm, followed by washing the flakes in a hot aqueous medium containing alkaline materials and surfactants, preferably non-ionic, to remove particulate and absorbed contaminants from the surfaces of the flakes. This step is followed by de-watering and then drying the flakes to a moisture content of 0.1 % w/w maximum, and more preferably 0.01 % w/w maximum. The next step involves removing absorbed contaminants and moisture by heating and vigorously mixing the flakes under vacuum, preferably 1-10 millibar, more preferably 2-7 millibar and at a temperature less than the melting point of PET, preferably in the range 170-220 DEG C for at least 30 minutes, preferably at least 60 minutes. The final step involves melting the flakes in a screw extruder equipped for vacuum processing and extruding the molten material to form strands that are pelletised.
Description
New Zealand Paient Spedficaiion for Paient Number 517832
PCT/AU00/01131 Received 12 November 2001
1
PROCESS FOR PREPARING FOOD CONTACT GRADE POLYETHYLENE TEREPHTHALATE RESIN FROM WASTE PET CONTAINERS
Technical Field
This invention relates to methods for preparing polyethylene terephthalate
(PET) resin from plastic waste that includes PET containers. It also relates to PET obtained according to the process.
Background to the Invention
PET is a widely used polymer or resin with a broad range of applications but •o which has a particularly widespread use as a beverage container or bottle. The use of PET for beverage containers has increased rapidly over the last decade and has to a large extent replaced conventional glass beverage containers especially for carbonated soft drinks. Part of the widespread acceptance of PET has been attributed to its ability to be used for food contact as well as its light weight relative to glass of comparable 15 strength and its ability to resist breakage.
Over recent years environmental pressures have increased and there is a demand for the recycling of many materials, especially plastics. One common source of recyclable material is post consumer curbside waste. With PET containers most of the applications for recycled PET are for relatively low specification products that use a mixture of thermoplastic resins or polymers including PET. In these applications removal of contaminants is not important. It is desirable that PET containers may be recycled to produce PET resin that is suitable for the same applications as virgin PET. For example, it is especially desirable that the recycled resin may be used for food contact applications. However, for such applications there are strict limits on the 25 presence of contaminants.
Various methods have been proposed for recycling PET resin. One such method is disclosed in US Patent No. 5554657 which is assigned to the Shell Oil Company. In this patent a mixed polymer recycle stream that includes PET polymers is contacted with a solvent that selectively dissolves PET. This
AMENDED IPEA/*
PCT/AUOO/OH31
Received 25 October 2- -
polymer solution is then separated from undissolved material and cooled to allow the precipitation of the PET resin. While this process leads to excellent quality product it is expensive as it involves the use of organic solvents which need to be recycled themselves. Other recycling methods involve the separation 5 of particulate contaminants by filtration of a molten polymer. This filtration method is facilitated by reducing the molecular weight and thus the intrinsic viscosity of the polymer to allow the molten material to flow more readily. However this reduction in molecular weight necessitates a final polymerisation or condensation reaction stage to produce PET of the required viscosity and 10 molecular weight. This method also requires the frequent replacement and/or cleaning of filters.
A further approach to recycling PET for food grade applications is disclosed in Australian Patent Application No. 9478299. In this invention beverage containers are produced having inner and outer skins. The inner skin 15 which is in contact with food is made from virgin PET and the outer skin is made from recycled PET resin. This invention removes the necessity for the recycled PET being suitable for food contact. However it is desirable that recycled PET can be used for direct food applications without using multiple skin production methods with their associated complexities and costs. 20 US Patent 5,876,644 discloses a process for preparing food contact grade
PET. The process involves the surface cleaning of comminuted pieces of post consumer PET containers; followed by melting of the cleaned pieces; followed by extrusion to form a melt and then blending of this melt with a melt virgin polyester prepolymer. The combined melt is then solidified and polymerisation 25 is then effected while the pellets are in the solid state. The use of virgin PET prepolymer would have the effect of reducing the contaminant level as well as allowing solid state polymerisation to take place to achieve the desired intrinsic viscosity increase. It is an important feature of this earlier invention that molecular weight increase takes place in the solid state after extrusion. As this 30 process requires a post extrusion solid state increase in intrinsic viscosity a
AMENDED SHEET l?£A,'AU
rtl /AUUU/UilJl deceived 25 October 2001
reduction in the intrinsic viscosity during extrusion is permitted or achieved by adding water prior to melting and extrusion (see column 7, lines 25-35).
PET originating from sorted collections of solid urban refuse can be contaminated with a range of materials. The PET will include both food contact 5 grade PET such as containers as well as non food contact grade PET. The range of non PET materials include other polymers especially polyolefins such as HDPE. Other common contaminants are metals, particulate material such as dirt, glues, paper, inks and remnants of materials stored in the containers. It is desirable that food contact grade PET may be obtained from such collections of 10 urban refuse.
Summary of the Invention
This invention provides in one form a process for preparing food contact grade PET from a waste stream containing PET and non PET materials comprising the following steps:
sorting at least some of the non PET materials from the waste stream;
dividing the PET containers into flakes of preferable maximum size approximately 10mm;
washing the flakes in a hot aqueous medium containing alkaline materials and surfactants, preferably non-ionic, to remove particulate and 20 absorbed contaminants from the surfaces of the flakes;
de-watering and then drying the flakes to a moisture content of 0.1% w/w maximum, and more preferably 0.01% w/w maximum;
optionally removing absorbed contaminants and moisture by heating and vigorously mixing the flakes under vacuum, preferably 1- 10 millibar, more 25 preferably 2-7 millibar and at a temperature less than the melting point of PET, preferably in the range 170-220°C for at least 30 minutes, preferably at least 60 minutes;
melting the flakes in a screw extruder under vacuum to remove absorbed contaminant and;
extruding the molten material to form strands that are pelletised.
AME.xD=D 2HZE7
irSA/AU
Received 25 October 20:;:
Preferably the material in the extruder is maintained at 280 - 290°C with a residence time of less than 60 seconds.
Preferably the heating to remove the absorbed contaminants is attained by frictional forces from the vigorous mixing.
Detailed Description of the Invention
To meet FDA requirements for food contact grade PET the recycled PET must have contamination sufficiently low than such that the level of extractables is less than 10 ppb. As well as contaminants from the presence of non PET containers such as dirt, and other plastics, a range of materials may be adsorbed 10 into or absorbed onto PET surfaces. These contaminants can include organo metallic materials such as copper octoate. Absorbed materials may include polar and non polar organic materials that have a range of volatilities.
It is an important feature of the present invention that the majority of adsorbed and absorbed materials are removed while the PET material is in flake 15 form. We have found this facilitates the removal of contaminants that are generally either on or near the surface of the PET flakes. We have found that the removal of such contaminants after the material has become molten is much less effective as the contaminants tend to become buried in the resinous mass. It is also an important feature of the present invention that water content is 20 reduced to low levels and is further reduced during the vacuum venting of the PET melt in the screw extruder. We have found the low initial water level and the vacuum venting in the melt extruder enables the equilibrium water content to be reduced such that the molecular weight is increased. The presence of excess levels of water at melt temperatures tends to cause hydrolysis of the ester 25 linkage leading to reduced molecular weight and thus the intrinsic viscosity of the resin.
This invention will be further described by reference to preferred processes.
An urban solid waste stream consisting of baled bottles are passed 30 through a debaler that singulates the bottles so that they can be fed at a steady
AMENDE? Sh'ZZT
Received 25 October 2001
0 20
rate to the inlet of a pre-wash unit. The preferred pre-wash unit is one that utilises elevated temperatures and alkaline surfactants such as one like a Sorema Bottle Pre-wash unit. However similar units that have either a continuous or batch-wise mode of operation may also be used.
The feed rate is typically in the range 500 kgs to 2500 kgs per hour with 1500 kgs per hour being the optimum rate. The action of the pre-wash unit is to tumble the bottles using the rotary motion of the cylindrical tumbler unit about its longitudinal axis. Internal baffles in the tumbler ensure that all bottles are singulated by repeated impact of the bottles falling against the walls and baffles while they are exposed to hot water and steam. The internal temperature is typically maintained in the range 90 to 100°C with temperatures greater than 95 °C being preferred. The residence time in the pre-wash unit is generally in the range between 3 minutes and 15 minutes with a typical time being 5 minutes. The water in the pre-wash may include cleaning agents such as caustic soda and non-foaming detergents. Typical concentrations of the caustic soda and detergent are 0.1 to 3% (ideally 0.5%) and 0.1 to 0.5% (ideally 0.2%) respectively.
The preferred detergent or surfactant is non-ionic.
The wash bottles are then de-watered by tumbling them in a cylindrical tumbler or similar device that allows the freed dirt and other contaminants such as labels and closures to pass through the perforations in the walls of the tumbler. The water can be reused after it is filtered and treated to remove foreign materials. The residence time in this de-watering unit is in the range 3 minutes and 15 minutes with a typical time being 5 minutes.
At this stage the bottles are clean externally except for a film of water and are mostly free of plastic or paper labels through the action of the mechanical handling of the bottles, the hot water and the cleaning agents.
The PET bottles are then sorted. The preferred process uses automatic systems such as those made by Magnetic Separation Systems (MSS), ROFIN or National Recovery Technologies Inc (NRT) although manual sorting can also be
^L-l/AUUU/UllJi
Received 25 October 20? -
used. Particularly good results are achieved when a sequence of compositional analysis and sorting modules are used to sort the PET bottles to give a level of purity of no more than 20 ppm of PVC. The level of sorting of non PET should be to 99.998% purity. The MSS modules use modular sensors to detect the 5 presence of specific plastics and air jets to eject the bottles at a specific station.
The first module uses an X-ray absorption to detect the chlorine atom in PVC and the PVC bottles are ejected at this station. This module also removes aluminium cans due to their strong X-ray absorption.
The second module uses infra-red absorption to detect HDPE (high 10 density polyethylene) bottles and these are then ejected.
The third module uses near infra-red absorption to detect PET and in this module all the non PET bottles are ejected. This module will eject bottles such as PVC, HDPE, polypropylene, polystyrene and aluminium cans.
The fourth module uses X-ray absorption to detect the chlorine atom in 15 PVC and the PVC bottles are ejected at this station. This module also removes aluminium cans due to their strong X-ray absorption.
A manual inspection is used to finally check that only PET bottles proceed into the later stages of the process.
The sorted PET containers are then reduced in size using a wet grinder 20 such as a Sorema hot wash, separation and rinsing system or its equivalent.
The wet grinder uses multiple rotating knives to cut the PET bottles against stationary knives in the presence of water that is at ambient temperature or at elevated temperatures (from 10 to 40°C, with 15 to 20°C being most often used), and which will contain caustic soda and low foaming surfactants and 25 antifoam additives. Typical concentrations of the caustic soda and detergent is 0.1 to 3% (ideally 0.5%) and 0.1 to 0.5% (ideally 0.2%) respectively. Anti-foam use is related to surfactant level and is usually in the range 0.01 to 1%.
The PET bottles are cut against a screen with a hole size of 10mm to 30mm with 16 to 20 mm being the most common. This gives an intense 30 washing and simultaneous cutting effect on the PET bottles resulting in a range
AMENDED SHEET! i.-EAv'AU
FC1/AUUU/U11J1
Received 25 October 2001
of average flake sizes that varies from 3mm to 12mm with the most numerous being under 8mm.
After grinding to this small size the mixture of PET flake and polypropylene particles (from closures and neck rings) is fed into a hot wash 5 station such as Sorema Hot Wash Reactors (or similar) where the mix is intensively washed for 10 to 20 minutes at temperatures from 75 to 95°C with 90°C being the ideal. The flakes are fed into the reactors at a liquid to plastic flake slurry ratio of 90/10 to 65/35 with 75/25 Volume/Volume being most common.
The reactors are designed to provide turbulent washing conditions where particles impinge on each other through the use of opposed-rotor, dual-rotor stirrers that are used in non-central positions to prevent laminar mixing from occurring, thus ensuring the most intense washing effect on the PET flakes.
After washing the flakes are separated from the wash solution by the use 15 of a centifruge or screen, and the flakes are subjected to a sink-float separation in a tank of water where the polypropylene particles float due to their density being less than that of water (915 kg/m3) and the PET particles sink due to their density being greater than that of water (1400 kg/m3).
The separated PET flakes are then further rinsed at least twice in clean 20 water to remove the residual traces of surfactants and dilute contaminants. The pathway of the water and flakes is counter current to provide the maximum rising effect.
The PET flakes are then de-watered to give a very low level of moisture, i.e. down to 0.005% water.
This can be done by staged drying with fluidised bed driers to remove apparent moisture followed by conventional recirculating air driers, desiccant driers, agglomerators or other drying systems that may also use a dry gas to dry the PET at elevated temperatures (140 - 185°C).
The fluidised bed driers will remove the moisture from saturated levels 30 down to levels of less than 1% and typically 0.5%.
AMENDED SHEET
<'<-.1- '-'J
Received 25 October 2(JL _
The desiccant driers, agglomerators or other driers will reduce the moisture level to at least 0.01% i.e. lOOOppm of water with an ideal level of 0.005% of moisture, i.e. 500ppm. In conventional driers this may require the use of long residence times as well as high temperatures, eg. temperatures of the 5 order of 120 to 175°C for 8 to 5 hours with 170°C for 5 hours proving optimum. The use of pre drying of the PET flakes is important as it leads to an increase rather than decrease in the intrinsic viscosity (IV) of the polymer in the following stages of the process. For example, the IV of the final PET pellet with the pre drying step was 0.833 versus 0.749 without compared to the IV of 10 the flake itself of 0.767.
The dried flakes are then subjected to vacuum decontamination.
This process uses high levels of vacuum, preferably 1-10 millibar, more preferably 2-7 millibar, while the PET is subjected to elevated temperatures (170 to 215°C) and mixing for controlled residence times of typically 1 hour, 15 although longer times may also be useful. This decontamination can be performed in a shredder chamber modified to maintain a vacuum, or in a fluidising mixer modified to hold a vacuum. Frictional forces between flakes and parts of the equipment lead to heat build up and this is the preferred method of attaining the desired temperature. The impeller in the chamber is rotated at 20 between 200 to 220 rpm converting mechanical energy into heat. Increasing the speed generates high temperatures with typically a temperature gradient, the higher temperatures being at the bottom. For example, when the impeller speed was 220 rpm the temperature at the bottom was 199°C, in the middle was 189°C and at the top 169°C.
Preferably the loading of the chamber with the PET flakes and the rotor speed are selected so that the chamber was filled to a sufficiently high level, approximately 70%, that flake introduced through a vacuum lock could reside at the top for a controlled residence time without the risk of immediately being mixed into the bulk of the flake and being extruded with only a short residence 30 time. The conditions in the chamber were balanced so that the PET flake was
AMENDED SHEET IPEA'A'J
Received 25 October 2001
progressively exposed to higher temperatures while under high vacuum and maintained at this condition for at least one hour after which it was introduced into the extruder.
The decontamination of the PET takes place in the mixer by the 5 combined action of the vacuum, elevated temperature and the residence time of the PET under these conditions.
The decontaminated PET flakes are then fed to a single screw extruder with an extrusion screw designed for the processing of PET and capable of applying vacuum venting to the PET melt at 280 to 290°C. The process could 10 be conducted in a similar twin screw extruder with vacuum venting or in a twin or multi-screw extruder with vacuum venting. The key requirement is the capability to melt the PET (melt temperature in the range 265 - 300°C, preferably 280°C) and to apply one or more stages of vacuum venting (at preferably 1 millibar or less) without applying excessive shear to the PET in the 15 melt stage through excessive mechanical working of the melt. Excessive shear leads to a decrease in the IV. The application of the higher temperatures in the melt coupled with the vacuum venting allows removal of the least volatile fluids that may have been absorbed into the PET.
While this process has been described without the use of chemical chain 20 extenders to increase the IV of the PET, these chemical materials may also be used. Chain extender materials are known and usually comprise one or more of a polycarboxylic acid or anhydride, a polyol and an esterification catalyst. For example, we have found a mixture of pyromellitic dianhydride, anhydride, pentaerythritol and antimony oxide in the weight ratios of 4:1:0.5 is a 25 particularly useful chain extender composition. In the process described above the use of this chain extender composition has been able to increase the IV of the PET to 0.930 when used at 0.3% w/w of PET. Higher levels, eg 1.0% w/w increased the IV to 1.300.
Received 25 October 20'-.':
After melting and vacuum venting the melt is filtered by passing it through fine metal mesh filters (usually the mesh size is 120 mesh or finer) to remove any particles.
The extruded melt may then be converted to pellets typically 3mm using 5 conventional techniques such as by using an underwater die face cutter or hot die face and water ring that quenches the melt into pellets as they are cut. Further steps may include crystallising the pellets and pre-drying the pellets prior to moulding. The crystallising is carried out by heating the PET pellets while they are kept moving via tumbling or agitation. The temperature is 10 maintained at from 120°C to 170°C for between 10 minutes and 1 hour.
Pre drying is carried out by heating the pellets at elevated temperatures in hot gas that has a dew point of less than 40°C. The temperatures used typically vary from 140°C to 190°C for a duration that typically varies from 4 hours to 7 hours.
The effectiveness of the recycling process of the present invention is illustrated by introducing the following contaminants to PET containers:
toluene 10% v/v, chloroform 10% u/v, benzophenone 1% v/v, methyl stearate 1 % v/v and copper octoate 1 % v/v.
The concentrations of these contaminants after the various stages of the 20 process steps of the present invention are set out in Table 1. These results show that after the process of the present invention contamination levels in the extruded pellets are acceptably low. The Table also shows the levels of extractables from PET bottles made from pellets prepared as described above.
AMENDED 3;-;237
Claims (11)
1. A process for preparing food contact grade PET from a waste stream containing PET and non PET materials comprising the following steps: sorting at least some of the non PET materials from the waste stream; 5 dividing the PET containers into flakes; washing the flakes in a hot aqueous medium containing alkaline materials and surfactants to remove particulate and absorbed contaminants from the surfaces of the flakes; de-watering and then drying the flakes to a moisture content of 0.1% w/w 10 maximum; melting the flakes in a screw extruder under vacuum to remove absorbed contaminants; and extruding the molten material to form strands that are pelletised. 15
2. A process according to claim 1 wherein there is a further heating and mixing step, before the extruder, that heats and vigorously mixes the flakes under vacuum at a temperature less than the melting point of PET.
3. A process according to claim 1 or claim 2 wherein the surfactants in the 20 flake washing step are non-ionic.
4. A process according to any one of claims 1-3 wherein the maximum moisture content of the flakes after the drying step is 0.01% w/w. 25
5. A process according to any one of claims 2-4 wherein the heating and mixing step is conducted at a reduced pressure of 1 - 10 millibar.
6. A process according to claim 5 wherein the pressure is in the range of 2-7 millibar. 30 PCT/AU00/01131 Received 25 October 2001 -13-
7. A process according to any one of claims 2-6 wherein the heating and mixing step is conducted at a temperature in the range 170 - 200°C for at least 30 minutes. 5
8. A process according to claim 7 wherein the heating and mixing step is conducted for at least 60 minutes.
9. A process according to any one of claims 1-8 wherein the material in the extruder is maintained at a temperature in the range 280 - 290°C for less than sixty seconds at a reduced pressure of 1 millibar or less.
10. A process according to any one of claims 1-9 wherein a chemical chain extender is used to increase the molecular weight of the recycled PET. 15
11. Recycled food contact grade PET prepared according to a process as defined in any one of claims 1-10. • 10 amemchd s:-; ~rr iPEA/AU
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ2946A AUPQ294699A0 (en) | 1999-09-17 | 1999-09-17 | Process for preparing food contact grade polyethylene terephthalate resin from waste pet containers |
PCT/AU2000/001131 WO2001021373A1 (en) | 1999-09-17 | 2000-09-18 | Process for preparing food contact grade polyethylene terephthalate resin from waste pet containers |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ517832A true NZ517832A (en) | 2002-06-28 |
Family
ID=3817111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ517832A NZ517832A (en) | 1999-09-17 | 2000-09-18 | Process for preparing food contact grade polyethylene terephthalate resin from waste pet containers |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1244540A4 (en) |
JP (1) | JP2003509249A (en) |
KR (1) | KR20020055580A (en) |
AU (2) | AUPQ294699A0 (en) |
BR (1) | BR0014094A (en) |
CA (1) | CA2384878A1 (en) |
NZ (1) | NZ517832A (en) |
WO (1) | WO2001021373A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7297721B2 (en) | 2003-06-20 | 2007-11-20 | Futura Polyesters Limited | Process for controlled polymerization of a mixed polymer |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10032900C2 (en) * | 2000-07-06 | 2002-11-21 | B & B Anlagenbau Gmbh | Process for the preparation of PET containers with an alkaline hydrolysis |
DE10054226A1 (en) * | 2000-11-02 | 2002-05-08 | Buehler Ag | Process for processing a polycondensate in a multi-screw extruder |
DE60312482T2 (en) | 2002-02-01 | 2007-06-21 | Basf Corp. | OLIGOMERE CHAIN EXTENDER FOR TREATMENT AND AFTER-TREATMENT AND RECYCLING OF CONDENSATE POLYMERS, COMPOSITIONS AND APPLICATIONS BASED ON THEM |
DE10348144A1 (en) | 2003-10-13 | 2005-05-19 | Krones Ag | PET bottle recycling |
DE102005013701A1 (en) | 2005-03-24 | 2006-09-28 | Krones Ag | Method and device for the decontamination of plastic flakes |
GB0615765D0 (en) * | 2006-08-09 | 2006-09-20 | Waste And Resources Action Pro | Recycling process for polyethylene terephthalate (PET) |
JP5049365B2 (en) | 2010-03-09 | 2012-10-17 | 中本パックス株式会社 | Method for producing food container sheet |
WO2013057737A2 (en) * | 2011-06-20 | 2013-04-25 | Essel Propack Limited | Process of recycling plastics, products and applications thereof. |
KR101437094B1 (en) | 2011-07-13 | 2014-09-02 | 버어 양 | A plastic drying method and device |
US9359482B2 (en) | 2011-08-02 | 2016-06-07 | Mba Polymers, Inc. | Methods for reducing contamination in plastics recovered from durable goods |
US20130261197A1 (en) | 2012-04-03 | 2013-10-03 | Luigi Bacchiocchi | Additive for Use in Wash Step of PET Recycling Process |
US10487422B2 (en) | 2012-05-31 | 2019-11-26 | Aladdin Manufacturing Corporation | Methods for manufacturing bulked continuous filament from colored recycled pet |
US11045979B2 (en) | 2012-05-31 | 2021-06-29 | Aladdin Manufacturing Corporation | Methods for manufacturing bulked continuous filament from recycled PET |
US10532495B2 (en) | 2012-05-31 | 2020-01-14 | Aladdin Manufacturing Corporation | Methods for manufacturing bulked continuous filament from recycled PET |
US9630354B2 (en) | 2012-05-31 | 2017-04-25 | Mohawk Industries, Inc. | Method of manufacturing bulked continuous filament |
US10695953B2 (en) | 2012-05-31 | 2020-06-30 | Aladdin Manufacturing Corporation | Methods for manufacturing bulked continuous carpet filament |
US9630353B2 (en) | 2012-05-31 | 2017-04-25 | Mohawk Industries, Inc. | Method of manufacturing bulked continuous filament |
US10538016B2 (en) | 2012-05-31 | 2020-01-21 | Aladdin Manufacturing Corporation | Methods for manufacturing bulked continuous carpet filament |
US9636860B2 (en) | 2012-05-31 | 2017-05-02 | Mohawk Industries, Inc. | Method of manufacturing bulked continuous filament |
US8597553B1 (en) | 2012-05-31 | 2013-12-03 | Mohawk Industries, Inc. | Systems and methods for manufacturing bulked continuous filament |
US9636845B2 (en) | 2012-05-31 | 2017-05-02 | Mohawk Industries, Inc. | Method of manufacturing pet nurdles |
WO2014070908A1 (en) | 2012-10-30 | 2014-05-08 | Mba Polymers, Inc. | Method for improving the surface appearance and processing of plastics recovered from durable goods |
KR101301555B1 (en) * | 2013-03-07 | 2013-09-06 | 박철우 | Processing method of polyethylene pipe |
US10343323B2 (en) | 2014-07-10 | 2019-07-09 | Nestec S.A. | Method for processing polyethylene terephthalate |
PT3221107T (en) * | 2014-11-18 | 2021-01-29 | Aladdin Manufactuing Corp | Systems and methods for manufacturing bulked continuous filament |
ITUB20155870A1 (en) * | 2015-11-25 | 2017-05-25 | Previero Sas | METHOD AND APPARATUS FOR THE DETERMINATION OF ONE OR MORE SUBSTANCES FOR THE TREATMENT OF PLASTIC MATERIALS |
US10751915B2 (en) | 2016-11-10 | 2020-08-25 | Aladdin Manufacturing Corporation | Polyethylene terephthalate coloring systems and methods |
CH713339A1 (en) | 2017-01-03 | 2018-07-13 | Alpla Werke Alwin Lehner Gmbh & Co Kg | PET regranulate with high intrinsic viscosity and process for its preparation. |
WO2018140884A1 (en) | 2017-01-30 | 2018-08-02 | Mohawk Industries, Inc. | Methods for manufacturing bulked continuous filament from colored recycled pet |
EP3589473A1 (en) | 2017-03-03 | 2020-01-08 | Aladdin Manufactuing Corporation | Method of manufacturing bulked continuous carpet filament |
WO2019055762A1 (en) | 2017-09-15 | 2019-03-21 | Mohawk Industries, Inc. | Polyethylene terephthalate coloring method and system for manufacturing a bulked continuous carpet filament |
US11242622B2 (en) | 2018-07-20 | 2022-02-08 | Aladdin Manufacturing Corporation | Bulked continuous carpet filament manufacturing from polytrimethylene terephthalate |
DE102018009171A1 (en) * | 2018-11-22 | 2020-05-28 | Bb Engineering Gmbh | Method and device for recycling plastics |
CH717234A1 (en) * | 2020-03-16 | 2021-09-30 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Process for the production of a PET starting material suitable for use in an extrusion blow molding process and hollow bodies produced therefrom. |
TWI761195B (en) | 2021-04-29 | 2022-04-11 | 南亞塑膠工業股份有限公司 | Method for forming polyester material from recycled film |
JP7519109B2 (en) | 2022-02-14 | 2024-07-19 | ウツミリサイクルシステムズ株式会社 | Method for producing recycled material for plastic trays and recycled material for plastic trays |
CH719619A1 (en) * | 2022-04-22 | 2023-10-31 | Alpla Werke Alwin Lehner Gmbh & Co Kg | Method for recycling polyester containers. |
JP7185366B1 (en) | 2022-06-23 | 2022-12-07 | 株式会社日本選別化工 | PET bottle foreign matter removing method and foreign matter removing device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4092458A (en) * | 1975-05-15 | 1978-05-30 | E. I. Du Pont De Nemours And Company | Porous laminar pellets of waste poly(ethylene terephthalate) film, and processes for drying and polymerization |
FR2599665B1 (en) * | 1986-06-06 | 1988-11-04 | Rhone Poulenc Fibres | PROCESS AND DEVICE FOR REGENERATING WASTE POLYMER-BASED DEC HETS |
US4830188A (en) * | 1987-09-30 | 1989-05-16 | Rutgers, The State University | Plastics separation and recycling methods |
US5503790A (en) * | 1989-10-05 | 1996-04-02 | Solo Cup Company | Method of producing disposable articles utilizing regrind polyethylene terephthalate (PET) |
DE4127572C1 (en) * | 1991-08-21 | 1993-03-11 | Kali Und Salz Ag, 3500 Kassel, De | |
EP0698462B1 (en) * | 1994-08-23 | 2001-05-23 | ECO SELECTA ITALIA S.r.L. | Process for the re-use of P.E.T. waste material, and installation for carrying out the process |
US5876644A (en) * | 1996-08-27 | 1999-03-02 | Wellman, Inc. | Food quality polyester recycling |
US5886058A (en) * | 1997-02-03 | 1999-03-23 | Illinois Tool Works Inc. | Inline solid state polymerization of pet flakes for manufacturing plastic strap |
-
1999
- 1999-09-17 AU AUPQ2946A patent/AUPQ294699A0/en not_active Abandoned
-
2000
- 2000-09-18 BR BR0014094-5A patent/BR0014094A/en not_active Application Discontinuation
- 2000-09-18 CA CA002384878A patent/CA2384878A1/en not_active Abandoned
- 2000-09-18 WO PCT/AU2000/001131 patent/WO2001021373A1/en active IP Right Grant
- 2000-09-18 NZ NZ517832A patent/NZ517832A/en not_active IP Right Cessation
- 2000-09-18 EP EP00965627A patent/EP1244540A4/en not_active Withdrawn
- 2000-09-18 KR KR1020027003540A patent/KR20020055580A/en not_active Application Discontinuation
- 2000-09-18 JP JP2001524779A patent/JP2003509249A/en active Pending
- 2000-09-18 AU AU76310/00A patent/AU777435C/en not_active Ceased
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7297721B2 (en) | 2003-06-20 | 2007-11-20 | Futura Polyesters Limited | Process for controlled polymerization of a mixed polymer |
Also Published As
Publication number | Publication date |
---|---|
EP1244540A1 (en) | 2002-10-02 |
AU777435C (en) | 2006-02-23 |
KR20020055580A (en) | 2002-07-09 |
BR0014094A (en) | 2002-05-21 |
JP2003509249A (en) | 2003-03-11 |
AUPQ294699A0 (en) | 1999-10-14 |
WO2001021373A1 (en) | 2001-03-29 |
AU7631000A (en) | 2001-04-24 |
EP1244540A4 (en) | 2002-11-06 |
CA2384878A1 (en) | 2001-03-29 |
AU777435B2 (en) | 2004-10-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU777435B2 (en) | Process for preparing food contact grade polyethylene terephthalate resin from waste pet containers | |
EP1084171B1 (en) | Food quality polyester recycling | |
US4728045A (en) | Method for reclaiming bonded, two-resin articles | |
US4033907A (en) | Reclaiming waste plastics | |
WO2013057737A2 (en) | Process of recycling plastics, products and applications thereof. | |
NO338641B1 (en) | Crystallized polyethylene terephthalate containing silicon and process for its preparation | |
KR20220099983A (en) | Waste treatment method and its reactor system | |
JP2007537894A (en) | Waste plastic recycling process | |
JP3613198B2 (en) | Flake foreign matter removal method in PET bottle recycling | |
WO2005121230A1 (en) | Process for decontamintaion of recycled polyester (pet) flakes | |
CA2381769A1 (en) | Process for removing paint from polymeric material | |
CA2225922A1 (en) | Process for recovering a solid microporous polyester polymer from a recycle stream and products made thereby | |
JP3711794B2 (en) | Manufacturing method of recycled polyester resin sheet. | |
JP4014356B2 (en) | How to recycle plastic bottles | |
US9359482B2 (en) | Methods for reducing contamination in plastics recovered from durable goods | |
JP3794708B2 (en) | Improved decontamination method of recycled polyethylene terephthalate by particle size reduction | |
EA013407B1 (en) | Separation of contaminants from polyester materials | |
JP2001520703A (en) | Recycling of polyester for food | |
US20060169808A1 (en) | Method for treating recycled polyethylene terephthalate containing melting contaminants | |
Sato et al. | Bumper recycling technology | |
Yurtseven | The effect of particle size and drying on the physical and mechanical properties of recycled PET | |
La Mantia | 3CP | |
MXPA98000121A (en) | Process for the recovery of a polymer microporose polyester, solid, from a recycling current and products made by me | |
AU2004232712A1 (en) | Improved method for treating recycled polyethylene terephthalate |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PSEA | Patent sealed | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
LAPS | Patent lapsed |