EP3765560A1 - Chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production - Google Patents
Chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin productionInfo
- Publication number
- EP3765560A1 EP3765560A1 EP19769254.4A EP19769254A EP3765560A1 EP 3765560 A1 EP3765560 A1 EP 3765560A1 EP 19769254 A EP19769254 A EP 19769254A EP 3765560 A1 EP3765560 A1 EP 3765560A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pet
- monomer
- wastes
- bottle
- recycled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002699 waste material Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000011347 resin Substances 0.000 title claims abstract description 22
- 229920005989 resin Polymers 0.000 title claims abstract description 22
- 230000034659 glycolysis Effects 0.000 title claims abstract description 17
- 239000000126 substance Substances 0.000 title claims abstract description 17
- 239000000178 monomer Substances 0.000 claims description 48
- 238000001914 filtration Methods 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- 238000001471 micro-filtration Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract description 68
- 239000004033 plastic Substances 0.000 abstract description 10
- 229920003023 plastic Polymers 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 9
- 229920002799 BoPET Polymers 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 abstract description 2
- 239000010784 textile waste Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- QPKOBORKPHRBPS-UHFFFAOYSA-N bis(2-hydroxyethyl) terephthalate Chemical compound OCCOC(=O)C1=CC=C(C(=O)OCCO)C=C1 QPKOBORKPHRBPS-UHFFFAOYSA-N 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 238000005886 esterification reaction Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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
- C08J11/10—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
-
- 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
- Y02W30/62—Plastics recycling; Rubber recycling
Definitions
- the invention is related to the chemical glycolysis method for recycling of PET plastic bottle wastes, transparent polyester textile wastes, transparent PET film wastes and PET sheet industry wastes by PET resin production which is in contact with food.
- recycling is the process of including the wastes having the possibility of reutilization in the production processes by converting them to secondary raw material through various physical and/or chemical processes.
- plastics are generally produced using petroleum-derived chemicals. When thrown into the nature, plastics do not only cause visual pollution, but also harm the surrounding organisms and the soil.
- recycling and importance of plastic waste is considerable because it takes many years to decompose or dissolve in nature in normal conditions.
- PET which is placed in the class of plastics that can be reshaped by heat and pressure and called as thermoplastic, is one of the most suitable plastic materials for recycling.
- PET plastic bottles which make up 30% of the PET-based materials with the highest consumption in plastics class, are used as composites less and can be recycled more easily; therefore it loses its property less and finds itself more usage area after conversion.
- the material does not lose its value in the recycling process through chemical recovery and re-polymerization of the waste.
- Different methods are used for the chemical recovery of PET wastes.
- One of these methods is the glycolysis method in which the PET is separated up to its monomers and oligomers. PET wastes are recycled through reintroducing the monomers obtained from the PET wastes by glycolysis method into the PET formation after the polycondensation reaction.
- very high purity is needed for the final product of the bottle applications that may come into contact with food.
- Bottle applications that may come into contact with food and obtained by the present applications of the chemical glycolysis recycling of PET are not suitable for the use of all kinds of PET waste determined. Therefore, monomer which can be used in PET resin synthesis in a suitable level for contact with food cannot be made by using all kinds of transparent PET wastes. There is no any filtration process up to 5 microns for food-contactable PET resin applications in the present processes.
- the present invention is related to the chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production, which removes the aforementioned disadvantages and provides new advantages to the relevant technical field.
- the main objective of the invention is to realize the production of monomer which can be used in PET resins that can be in contact with food.
- Another main objective of the invention is that all transparent PET wastes disposed by the consumer, industrial PET bottles, textile and engineering wastes to be used as raw material.
- Another main objective of the invention is to help reduce the environmental pollution caused by plastic materials.
- the invention is related to the chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production.
- the feature of the invention is to; - Realize the process of washing, drying and sorting in the PET fracture cleaning and separation unit and separate the metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures by the extraction process
- Figure 1 The schematic view of the system of PET glycolysis method which can be connected with PET resin production.
- FIG. 1 The flow chart of PET glycolysis method which can be connected with PET resin production.
- PET fracture depolymerization extruder 4. Mixing reactor for monomer production
- Figure 1 shows the schematic view of the system in which the chemical glycolysis method is applied.
- PET bottles which can be in contact with food, are obtained through the chemical glycolysis method using any type of transparent PET waste which can be connected to the production of the bottle-grade PET resin in the invention.
- the first step of the method is the process of cleaning of PET fractures in PET fracture cleaning and separation unit (1). This stage is very important to ensure the final product quality.
- the washing, drying and sorting process in the PET fracture cleaning and separating unit (1) is applied and metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures are separated by sorting process (101).
- PET fracture depolymerization extruder (3) is the most important equipment for melting the PET fractures and initiating depolymerization.
- Melted PET resin viscosity in a very short time by PET fracture depolymerization extruder (3) is reduced from 0,78dl/g to below 0,25dl/g (103). Rapid depolymerization process protects the molten polymer from thermal degradation and undesired reactions. Melt is fully transformed into monomers with viscosity less than 0,12 dl/g through the mixing reactor (4) for the production of monomer (104).
- All impurities greater than 5 microns are filtered and removed from the monomer with this filter.
- Monomer is pumped into the monomer storage tank (7) after ensuring the quality of the filtered monomer (108).
- Two monomer storage tanks (7) are used to ensure continuous monomer feed into the PET polymerization esterification reactor.
- One of the monomer storage tanks (7) is used to feed into PET polymerisation esterification reactor for use in PET resin production while the other monomer storage tank (7) is used to store the monomer coming from micro filtration (6).
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
This invention is related to the chemical glycolysis method for recycling of PET plastic bottle wastes, transparent polyester textile wastes, transparent PET film wastes and PET sheet industry waste by PET resin production which is in contact with food.
Description
CHEMICAL GLYCOLYSIS METHOD IN WHICH TRANSPARENT PET WASTES ARE RECYCLED TO BE USED IN BOTTLE-GRADE PET RESIN PRODUCTION
Technical Area
The invention is related to the chemical glycolysis method for recycling of PET plastic bottle wastes, transparent polyester textile wastes, transparent PET film wastes and PET sheet industry wastes by PET resin production which is in contact with food.
Known Status of the Technique
The reuse of many substances used in daily life by recycling is important in terms of preserving the natural resources for the future generations and protecting the ecological balance of the world. In general, recycling is the process of including the wastes having the possibility of reutilization in the production processes by converting them to secondary raw material through various physical and/or chemical processes. There are many areas where recycling can be made. Among these, the most known and used one is the conversion in plastic area. Plastics are generally produced using petroleum-derived chemicals. When thrown into the nature, plastics do not only cause visual pollution, but also harm the surrounding organisms and the soil. In addition, recycling and importance of plastic waste is considerable because it takes many years to decompose or dissolve in nature in normal conditions.
PET, which is placed in the class of plastics that can be reshaped by heat and pressure and called as thermoplastic, is one of the most suitable plastic materials for recycling. When the life cycle analyzes are examined, PET plastic bottles, which make up 30% of the PET-based materials with the highest consumption in plastics class, are used as composites less and can be recycled more easily; therefore it loses its property less and finds itself more usage area after conversion.
The material does not lose its value in the recycling process through chemical recovery and re-polymerization of the waste. Different methods are used for the chemical recovery of PET wastes. One of these methods is the glycolysis method in
which the PET is separated up to its monomers and oligomers. PET wastes are recycled through reintroducing the monomers obtained from the PET wastes by glycolysis method into the PET formation after the polycondensation reaction. However, very high purity is needed for the final product of the bottle applications that may come into contact with food. Bottle applications that may come into contact with food and obtained by the present applications of the chemical glycolysis recycling of PET are not suitable for the use of all kinds of PET waste determined. Therefore, monomer which can be used in PET resin synthesis in a suitable level for contact with food cannot be made by using all kinds of transparent PET wastes. There is no any filtration process up to 5 microns for food-contactable PET resin applications in the present processes.
As a result, the existence of the above problems and the insufficiency of the existing solutions necessitated an improvement in the related technical field.
The Objective of the Invention
The present invention is related to the chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production, which removes the aforementioned disadvantages and provides new advantages to the relevant technical field.
The main objective of the invention is to realize the production of monomer which can be used in PET resins that can be in contact with food.
Another main objective of the invention is that all transparent PET wastes disposed by the consumer, industrial PET bottles, textile and engineering wastes to be used as raw material.
Another main objective of the invention is to help reduce the environmental pollution caused by plastic materials.
In order to fulfil all the objectives determined above and could be derived from the detailed description, the invention is related to the chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production. The feature of the invention is to;
- Realize the process of washing, drying and sorting in the PET fracture cleaning and separation unit and separate the metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures by the extraction process
- Feed the cleaned and extracted PET fractures continuously into the PET fracture depolymerization extruder by taking them in the PET fracture storage silo.
- Lower the melted PET resin viscosity in a very short time by PET fracture depolymerization extruder
- Ensure the complete conversion to the monomers by treating the melt with ethylene glycol in controlled proportions in the mixing reactor for monomer production
Pump the resulting monomer into the filtration reactor
- Mix the monomer with a suitable filtration agent in the filtration reactor
- Pump and filter the monomer treated with filtration agent to heated microfiltration
- Include the process steps of pumping the monomer into the monomer storage tank after ensuring the quality of the filtered monomer
The structural and characteristic features and all the advantages of the invention will become apparent through the detailed figures given below and by the detailed explanation made with reference to these figures. Therefore, the evaluation should be made by taking into account these figures and detailed explanation.
Figures to Help in Understanding the Invention
Figure 1. The schematic view of the system of PET glycolysis method which can be connected with PET resin production.
Figure 2. The flow chart of PET glycolysis method which can be connected with PET resin production.
Explanation of Component References
1. PET fracture cleaning and separation unit
2. PET fracture storage silo
3. PET fracture depolymerization extruder
4. Mixing reactor for monomer production
5. Filtration reactor
6. Micro filtration
7. Monomer storage tanks
Explanation of process steps
101. Realize the process of washing, drying and sorting in the PET fracture cleaning and separation unit (1) and separate the metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures by the extraction process
102. Feed the cleaned and extracted PET fractures continuously into the PET fracture depolymerization extruder (3) by taking them in the PET fracture storage silo (2).
103. Lower the melted PET resin viscosity in a very short time by PET fracture depolymerization extruder (3)
104. Ensure the complete conversion to the monomers by treating the melt with ethylene glycol in controlled ratios in the mixing reactor (4) for monomer production
105. Pump the resulting monomer into the filtration reactor (5)
106. Mix the monomer with a suitable filtration agent in the filtration reactor (5)
107. Pump and filter the monomer treated with filtration agent to heated microfiltration (6)
108. Pump the monomer into the monomer storage tank (7) after ensuring the quality of the filtered monomer
Explanation of the Invention in Detail
In this detailed explanation, preferred alternatives of the chemical glycolysis method in which the transparent PET wastes are recycled for use in the production of the bottle-grade PET resin in the invention are described so as to provide a better understanding of the subject and without making any limiting effects.
In addition, some elements or process steps prepared to provide a better understanding of the invention may have been used in various ways to ensure meaning integrity within the sentences. The elements or process steps used in the various expressions actually represent the same numbered element or process step.
Figure 1 shows the schematic view of the system in which the chemical glycolysis method is applied.
PET bottles, which can be in contact with food, are obtained through the chemical glycolysis method using any type of transparent PET waste which can be connected to the production of the bottle-grade PET resin in the invention.
The first step of the method is the process of cleaning of PET fractures in PET fracture cleaning and separation unit (1). This stage is very important to ensure the final product quality. In order to separate all other impurities from PET fractures, the washing, drying and sorting process in the PET fracture cleaning and separating unit (1) is applied and metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures are separated by sorting process (101).
Cleaned and extracted PET fractures are continuously fed into the PET fracture depolymerization extruder (3) by taking them into the PET fracture storage silo (2) (102). PET fractures depolymerization extruder (3) is the most important equipment for melting the PET fractures and initiating depolymerization. Melted PET resin viscosity in a very short time by PET fracture depolymerization extruder (3) is reduced from 0,78dl/g to below 0,25dl/g (103). Rapid depolymerization process protects the molten polymer from thermal degradation and undesired reactions. Melt is fully transformed into monomers with viscosity less than 0,12 dl/g through the mixing reactor (4) for the production of monomer (104). Bis (2-hydroxy ethyl) terephthalate (BHET) ie complete depolymerization process to the monomer level is required for micro-filtration (6). This process is accomplished by treating the melt in lowered viscosity with ethylene glycol in controlled ratios in the mixing reactor (4) for monomer production. The resulting monomer is pumped into the filtration reactor (5) to be subjected to a filtration of less than 5 microns (105). Process continues by mixing the monomer with a suitable filtration agent in the filtration reactor (5) (106). Microfiltration (6) is the most important step in providing the monomer required for PET resin production, which can be in contact with food. Monomer is filtered in micro filtration (6) heated by heat transfer oil (107). All impurities greater than 5 microns are filtered and removed from the monomer with this filter. Monomer is pumped into the monomer storage tank (7) after ensuring the quality of the filtered monomer (108).
Two monomer storage tanks (7) are used to ensure continuous monomer feed into the PET polymerization esterification reactor. One of the monomer storage tanks (7) is used to feed into PET polymerisation esterification reactor for use in PET resin production while the other monomer storage tank (7) is used to store the monomer coming from micro filtration (6).
Claims
1. It is related to the chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade PET resin production and the feature is to comprise the following steps;
- Realizing the process of washing, drying and sorting in the PET fracture cleaning and separation unit and separating the metals and PP, PVC, PE and similar wastes outside of the PET and coloured PET fractures by the extraction process (101),
- Feeding the cleaned and extracted PET fractures continuously into the PET fracture depolymerization extruder by taking them in the PET fracture storage silo (102),
- Lowering the melted PET resin viscosity in a very short time by PET fracture depolymerization extruder (103),
- Ensuring the complete conversion to the monomers by treating the melt with ethylene glycol in controlled ratios in the mixing reactor for monomer production (104),
- Pumping the resulting monomer into the filtration reactor (105),
Mixing the monomer with a suitable filtration agent in the filtration reactor (106),
- Pumping and filtering the monomer treated with filtration agent to heated microfiltration (107),
- Including the process steps of pumping (108) the monomer into the monomer storage tank after ensuring the quality of the filtered monomer.
2. It is related to the chemical glycolysis method in which transparent PET wastes are recycled to be used in bottle-grade PET resin production in accordance with the demand 1 and the feature is that reducing the viscosity of the PET resin melted in the said (103) step from 0,78dl/g to below 0,25dl/g.
3. It is related to the chemical glycolysis method in which transparent PET wastes are recycled to be used in bottle-grade PET resin production in accordance with the demand 1 and the feature is that providing the melt to be fully converted to monomers having a viscosity of less than 0,12 dl/g in the said (104) step.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/TR2019/000045 WO2020149798A1 (en) | 2019-01-15 | 2019-01-15 | Chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3765560A1 true EP3765560A1 (en) | 2021-01-20 |
Family
ID=67957360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19769254.4A Pending EP3765560A1 (en) | 2019-01-15 | 2019-01-15 | Chemical glycolysis method in which transparent pet wastes are recycled to be used in bottle-grade pet resin production |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3765560A1 (en) |
| WO (1) | WO2020149798A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102504202B1 (en) * | 2022-07-11 | 2023-02-27 | 에스케이케미칼 주식회사 | Method for preparing bis-2-hydroxyethyl terephthalate through continuous depolymerization |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11518865B2 (en) | 2019-05-20 | 2022-12-06 | Octal Saoc Fzc | Process for reclamation of polyester by reactor addition |
| US11161960B2 (en) | 2019-05-20 | 2021-11-02 | Octal Saoc Fzc | Process for reclamation of polyester by reactor addition |
| DE102021212695A1 (en) | 2021-11-11 | 2023-05-11 | Thyssenkrupp Ag | DEVICE AND PROCESS FOR THE PRODUCTION OF A POLYESTER DEPOLYMER, AND DEVICE AND PROCESS FOR THE PRODUCTION OF A POLYESTER |
| EP4198075A1 (en) | 2021-12-14 | 2023-06-21 | Köksan Pet ve Plastik Ambalaj Sanayi ve Ticaret Anonim Sirketi | Process for producing recycled pet resin and method for producing moulded articles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100866819B1 (en) * | 2001-10-16 | 2008-11-04 | 데이진 가부시키가이샤 | Method for recycling pet bottle |
| CN104479168A (en) * | 2014-11-18 | 2015-04-01 | 广东树业环保科技股份有限公司 | Waste PET (polyethylene terephthalate) decolorization recovery method, product and application |
-
2019
- 2019-01-15 EP EP19769254.4A patent/EP3765560A1/en active Pending
- 2019-01-15 WO PCT/TR2019/000045 patent/WO2020149798A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102504202B1 (en) * | 2022-07-11 | 2023-02-27 | 에스케이케미칼 주식회사 | Method for preparing bis-2-hydroxyethyl terephthalate through continuous depolymerization |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020149798A1 (en) | 2020-07-23 |
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