WO2015190941A1 - Method of polyethylene terephthalate pet waste recycling - Google Patents
Method of polyethylene terephthalate pet waste recycling Download PDFInfo
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- WO2015190941A1 WO2015190941A1 PCT/PL2014/000141 PL2014000141W WO2015190941A1 WO 2015190941 A1 WO2015190941 A1 WO 2015190941A1 PL 2014000141 W PL2014000141 W PL 2014000141W WO 2015190941 A1 WO2015190941 A1 WO 2015190941A1
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- terephthalic acid
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- 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
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
-
- 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 subject of this invention is the method of polyethylene terephthalate PET waste recycling, especially the method of raw materials recycling of PET waste in the form of clear and coloured packages, most frequently bottles left after beverages, containers, foil.
- the terephthalic acid salt is separated from alcohol by cooling the mixture down to a temperature below 90°C, after which water is added in order to dissolve terephthalic acid salt and to obtain two states - water state with dissolved terephthalic acid salt and the alcohol organic state which are separated from each other.
- terephthalic acid is separated by filtration and then it is subjected to washing.
- PET waste bits are digested in a temperature from 190°C to 265°C in a high-boiling monohydnc or multihydric alcohol or in their mixture, preferably with the addition of phenol in the presence of catalysts.
- an alkaline catalyst is applied, preferably sodium hydroxide or potassium hydroxide or their mixture, or an acidic catalyst, preferably paratoluenesulphonic acid or phosphoric acid. It is possible to use an organic acid salt and zinc, tin, lead salts and/or their mixture.
- PET transesterification process is carried out by adding high- boiling monohydric or multihydric alcohol or their mixture, preferably with the addition of phenol in stoichiometric quantities or redundant quantities and ethylene glycol is distilled under ordinary or reduced pressure. Ethylene glycol obtained in the first stage is discharged as one of the final products and its excess is used in another production cycle for the PET digestion process.
- the remaining semi-product is mixed with low- boiling alcohol or with a mixture of low-boiling alcohols and is subjected to transesterification, preferably in an increased temperature in the presence of a catalyst, in the conditions of continuous mixing, after which the high-boiling alcohol and terephthalic acid ester are separated.
- High-boiling alcohols separated in the second stage are added in the first stage of the following production cycle to the digested PET bits.
- water with a catalyst preferably a mineral acid
- hydrolysis process is carried out in a temperature above 50°C in the conditions of mixing.
- the low- boiling alcohol is distilled, after which the obtained water suspension of terephthalic acid PTA is subjected to filtration and the isolated terephthalic acid PTA is subjected to washing and drying.
- the low-boiling alcohols distilled in the third stage are added in the second stage to another production cycle.
- An essential advantage of this method of polyethylene terephthalate PET recycling according to the invention is obtaining of the final product in the form of the terephthalic acid which constitutes the baseline material for production of a polymer used for production of utensils, bottles, packages, small fittings and housings for electronic devices and also for production of the polyester fiber.
- Waste subjected to recycling doest no require initial isolation of other polymers and contaminants and separation into specific dye fractions. Filtration processes in specific stages of this manner allow to separate mechanical contaminants such as caps, labels and other.
- the recycling process is conducted in the conditions of ordinary pressure i reactors of simple construction.
- the manner of PET waste recycling consists of the following: in the first stage 1000 kg of multi-coloured, flaked PET obtained from bottles after beverages is digested in 400 kg of ethylene glycol, 200 kg of propylene glycol, 50 kg of phenol, and 200 kg of diethylene glycol and 45 kg of sodium hydroxide, by warming up to temperature of 223°C and maintaining in this condition for the period of three hours. Next, 450 kg of PEG 400, 250 kg of PEG 800, and 300 kg of glycerine and transesterification process is conducted in temperature of 200°C for two hours.
- the obtained pulp is heated and at the same time ethylene glycol is boiled off which is condensed and discharged as an intermediate product, hi the distillation process 620 kg of ethylene glycol is obtained, a part of which is used in another production cycle for the PET digestion process.
- the excess of ethylene glycol is discharged as an additional product.
- Warm reaction mixture is subjected to filtration and decolourization.
- 900 kg of propanol is added to the mixture and transesterification reaction with propanol is carried out for four hours in temperature of 85°C in the conditions of continuous mixing. After two layers of immiscible liquids area formed the bottom heavier layer in the quantity of 1056 kg is separated.
- the manner of PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 15 kg of p- toluenesulphonic acid, by mixing and heating up for three and a half hours until complete dissolution.
- the obtained matter is hot filtrated through a metal net with 0.25 mm mesh removing all non-dissolved non- polyester components and other contaminants.
- Two portions of 50 kg of active carbon each are added in sequence to the dissolution obtained in this way and the dissolution is decolourized by filtering the used active carbon.
- the bottom heavier layer in the quantity of 2145 kg is separated and it is added in the first stage of another production cycle to the digested PET bits.
- 4000 kg of 3% phosphoric acid is added to the upper layer and hydrolysis process is carried out in temperature of 95°C in the conditions of mixing for 5 hours.
- the alcohols formed during this reaction in the form of vapors are condensed and 895 kg is obtained to be used in another recycling cycle.
- the remaining terephthalic acid in the form of fine-crystalline suspension is subjected to filtration and drying and the ready product is obtained - terephthalic acid in the quantity of 849 kg.
- PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 20 kg of zinc acetate by heating and mixing for three and a half hours until it is completely dissolved.
- the further recycling process is carried out in the same manner as described in example 2.
- PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 24 kg of lead stearate by heating and mixing for three and a half hours until it is completely dissolved.
- the further recycling process is carried out in the same manner as described in example 2.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The manner of polyethylene terephthalate PET waste recycling, especially raw materials recycling to obtain terephthalic acid and ethylene glycol. In the first stage PET waste bits are digested in a temperature from 190°C to 265°C in high-boiling monohydric or multihydric alcohol or their mixture, preferably with addition of phenol in the presence of catalysts. PET transesterification process is carried out by adding of high-boiling monohydric or multihydric alcohol or their mixture, preferably with addition of phenol and ethylene glycol is distilled which is used in another production cycle for the PET digestion process. The excess ethylene glycol is discharged as an additional product. In the second stage the remaining semi-product is mixed with low-boiling alcohol or a mixture of low-boiling alcohols and is subjected to transesterification. High-boiling alcohol and terephthalic acid ester are separated to which, in the third stage, water with a catalyst are added. Hydrolysis process is carried out and low-boiling alcohol is distilled. The obtained water suspension of terephthalic acid is subjected to filtration and the discharged terephthalic acid is subjected to washing and drying.
Description
Method of Polyethylene Terephthalate PET Waste Recycling
The subject of this invention is the method of polyethylene terephthalate PET waste recycling, especially the method of raw materials recycling of PET waste in the form of clear and coloured packages, most frequently bottles left after beverages, containers, foil.
From patent US 7,893,122 we know the recycling process of crushed PET waste in which simultaneously the stages of digestion and saponification are carried out in an increased temperature in the environment of high-boiling alcohols with stoichiometric or redundant quantity of a strong hydroxide. As a result of the reaction, the state with glycol suspension of insoluble terephthalic acid salt is obtained. The reaction is led to alcohol boiling temperature and with the atmospheric pressure. Alcohols such as: octanol, ethylene glycol, hexanol, pentanol, butanol, propanol, ethanol, and methanol are used. As the products of the reaction, terephthalic acid salt and ethylene glycol are obtained, mixed with the baseline alcohol. In the next stage of separation, the terephthalic acid salt is separated from alcohol by cooling the mixture down to a temperature below 90°C, after which water is added in order to dissolve terephthalic acid salt and to obtain two states - water state with dissolved terephthalic acid salt and the alcohol organic state which are separated from each other.
In the following stage, terephthalic acid is separated by filtration and then it is subjected to washing.
In accordance with the invention relating the manner of polyethylene terephthalate PET waste recycling, especially raw materials recycling in order to obtain terephthalic acid and ethylene glycol, is conducted in a
few consecutive stages. After disintegration of PET waste in the first stage, PET waste bits are digested in a temperature from 190°C to 265°C in a high-boiling monohydnc or multihydric alcohol or in their mixture, preferably with the addition of phenol in the presence of catalysts. In this stage, an alkaline catalyst is applied, preferably sodium hydroxide or potassium hydroxide or their mixture, or an acidic catalyst, preferably paratoluenesulphonic acid or phosphoric acid. It is possible to use an organic acid salt and zinc, tin, lead salts and/or their mixture.
Then, PET transesterification process is carried out by adding high- boiling monohydric or multihydric alcohol or their mixture, preferably with the addition of phenol in stoichiometric quantities or redundant quantities and ethylene glycol is distilled under ordinary or reduced pressure. Ethylene glycol obtained in the first stage is discharged as one of the final products and its excess is used in another production cycle for the PET digestion process.
In the second stage, the remaining semi-product is mixed with low- boiling alcohol or with a mixture of low-boiling alcohols and is subjected to transesterification, preferably in an increased temperature in the presence of a catalyst, in the conditions of continuous mixing, after which the high-boiling alcohol and terephthalic acid ester are separated. High-boiling alcohols separated in the second stage are added in the first stage of the following production cycle to the digested PET bits.
In the third stage, water with a catalyst, preferably a mineral acid, are added to the terephthalic acid ester, and hydrolysis process is carried out in a temperature above 50°C in the conditions of mixing. Next, the low- boiling alcohol is distilled, after which the obtained water suspension of terephthalic acid PTA is subjected to filtration and the isolated terephthalic acid PTA is subjected to washing and drying.
The low-boiling alcohols distilled in the third stage are added in the second stage to another production cycle.
An essential advantage of this method of polyethylene terephthalate PET recycling according to the invention is obtaining of the final product in the form of the terephthalic acid which constitutes the baseline material for production of a polymer used for production of utensils, bottles, packages, small fittings and housings for electronic devices and also for production of the polyester fiber.
Use of this manner is especially important for the environment friendly waste management because this allows to use PET waste, most frequently in the form of bottles after beverages and packages of household products, due to which the quantity of waste dumped to municipal landfill site is limited where the period of deposition and decomposition is tens and even hundreds of years.
Waste subjected to recycling doest no require initial isolation of other polymers and contaminants and separation into specific dye fractions. Filtration processes in specific stages of this manner allow to separate mechanical contaminants such as caps, labels and other.
The recycling process is conducted in the conditions of ordinary pressure i reactors of simple construction.
Besides, special economic benefits come from the use of high-boiling alcohol and low-boiling alcohol, obtained in consecutive stages, in a closed circulation. Ethylene glycol obtained in the first stage of the process can be re-introduced for digestion of PET waste in the following process cycle, and its excess constitutes an additional product. Similarly, the high-boiling alcohol obtained in the second stage is returned to the process in the first stage of another cycle and the low-boiling alcohol
obtained in the third stage is used in the second stage of the following cycle.
The invention is explained more precisely in the four examples of use.
Example 1.
The manner of PET waste recycling consists of the following: in the first stage 1000 kg of multi-coloured, flaked PET obtained from bottles after beverages is digested in 400 kg of ethylene glycol, 200 kg of propylene glycol, 50 kg of phenol, and 200 kg of diethylene glycol and 45 kg of sodium hydroxide, by warming up to temperature of 223°C and maintaining in this condition for the period of three hours. Next, 450 kg of PEG 400, 250 kg of PEG 800, and 300 kg of glycerine and transesterification process is conducted in temperature of 200°C for two hours. The obtained pulp is heated and at the same time ethylene glycol is boiled off which is condensed and discharged as an intermediate product, hi the distillation process 620 kg of ethylene glycol is obtained, a part of which is used in another production cycle for the PET digestion process. The excess of ethylene glycol is discharged as an additional product. Warm reaction mixture is subjected to filtration and decolourization. In the second stage 900 kg of propanol is added to the mixture and transesterification reaction with propanol is carried out for four hours in temperature of 85°C in the conditions of continuous mixing. After two layers of immiscible liquids area formed the bottom heavier layer in the quantity of 1056 kg is separated. In the third stage, to the upper layer containing oily terephthalic acid ester and excess of propyl alcohol in the quantity of 1120 kg, 5000 kg of 5% water solution of sulphuric acid is added and hydrolysis process is carried out in temperature of 100°C in the conditions of mixing for four hours. The
alcohol created during this reaction consisting of vapors is condensed and 890 kg of propanol is obtained to be used in another production cycle. The remaining terephthalic acid in the form of fine-crystalline suspension is subjected to filtration, washing and drying and ready product is obtained - terephthalic acid in the quantity of 850 kg.
Example 2.
The manner of PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 15 kg of p- toluenesulphonic acid, by mixing and heating up for three and a half hours until complete dissolution. The obtained matter is hot filtrated through a metal net with 0.25 mm mesh removing all non-dissolved non- polyester components and other contaminants. Two portions of 50 kg of active carbon each are added in sequence to the dissolution obtained in this way and the dissolution is decolourized by filtering the used active carbon.
800 kg of diglycerol, 700 kg of PEG 800 are added to decolourized mixture and the mixture is heated up to temperature of 205°C under vacuum pressure equal to 50 mm Hg, and at the same time ethylene glycol is vaporized, next condensed and discharged as the intermediate product. During the distillation process lasting about three and a half hours 412 kg of ethylene glycol is obtained a part of which is used in another production cycle for the PET digestion process. The excess of ethylene glycol is discharged as an additional product. In the second stage, 900 kg of a mixture of ethanol and n-propanol in proportion 1:1 are added to the remaining mass, it is mixed intensively and heated up to temperature of 75 C. The transesterification process is carried out for
eight hours. After two layers of immiscible liquids are formed, the bottom heavier layer in the quantity of 2145 kg is separated and it is added in the first stage of another production cycle to the digested PET bits. 4000 kg of 3% phosphoric acid is added to the upper layer and hydrolysis process is carried out in temperature of 95°C in the conditions of mixing for 5 hours. The alcohols formed during this reaction in the form of vapors are condensed and 895 kg is obtained to be used in another recycling cycle. The remaining terephthalic acid in the form of fine-crystalline suspension is subjected to filtration and drying and the ready product is obtained - terephthalic acid in the quantity of 849 kg.
Example 3.
The manner of PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 20 kg of zinc acetate by heating and mixing for three and a half hours until it is completely dissolved. The further recycling process is carried out in the same manner as described in example 2.
Example 4.
The manner of PET waste recycling consists of the following: in the first stage 1000 kg of jagged dark blue and gray polyester waste car upholstery is digested in 200 kg of ethylene glycol, 200 kg of cyclohexanol, 100 kg of decyl alcohol, 50 kg of phenol, 24 kg of lead stearate by heating and mixing for three and a half hours until it is completely dissolved. The further recycling process is carried out in the same manner as described in example 2.
Claims
1. The manner of polyethylene terephthalate PET waste recycling, especially raw material recycling to obtain terephthalic acid and ethylene glycol, in which PET waste is disintegrated into small bits, characterized in that in the first stage PET waste bits are digested in a temperature from 190°C to 265°C in high-boiling monohydric or multihydric alcohol or in their mixtures, preferably with addition of phenol in the presence of catalysts and transesterification process of PET is carried out by adding high-boiling monohydric or multihydric alcohol or their mixture, preferably with addition of phenol, in stoichiometric or redundant quantities, and ethylene glycol is distilled under ordinary or reduced pressure, next, in the second stage, the remaining semi-product is mixed with low-boiling alcohol or a mixture of low-boiling alcohols and is subjected to transesterification, preferably in an increased temperature in the presence of a catalyst, in the conditions of continuous mixing, after which high-boiling alcohol and terephthalic acid ester are separated to which in the third stage water with a catalyst are added, preferably mineral acid, and hydrolysis process is carried out in a temperature above 50°C in the conditions of mixing, the low-boiling alcohol is distilled, after which the obtained water suspension of terephthalic acid is subjected to filtration and the discharged terephthalic acid is subjected to washing and drying.
2. The manner according to claim 1 characterized in that in the first stage alkaline catalyst is used, preferably sodium hydroxide or potassium hydroxide or their mixture.
3. The manner according to claim 1 characterized in that in the first stage acidic catalyst is used, preferably paratoluenesulphonic acid or phosphoric acid.
4. The manner according to claim 1 characterized in that in the first stage organic acid salts and zinc, tin, lead salts and/or their mixtures are used as catalyst.
5. The manner according to claim 1 characterized in that ethylene glycol obtained in the first stage as the intermediate product is used in another production cycle for the PET digestion process and the excess ethylene glycol is discharged as an additional product.
6. The manner according to claim 1 characterized in that high-boiling alcohols separated in the second stage are added in the first stage of another production cycle to the digested PET bits.
7. The manner according to claim 1 characterized in that low-boiling alcohols distilled in the third stage are added in the second stage of another production cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14830737.4A EP3155038A1 (en) | 2014-06-10 | 2014-12-17 | Method of polyethylene terephthalate pet waste recycling |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL408500A PL228319B1 (en) | 2014-06-10 | 2014-06-10 | Method for recycling of PET polyethylene terephthalate |
| PLP.408500 | 2014-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015190941A1 true WO2015190941A1 (en) | 2015-12-17 |
Family
ID=52396784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/PL2014/000141 WO2015190941A1 (en) | 2014-06-10 | 2014-12-17 | Method of polyethylene terephthalate pet waste recycling |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3155038A1 (en) |
| PL (1) | PL228319B1 (en) |
| WO (1) | WO2015190941A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019174656A1 (en) | 2018-03-12 | 2019-09-19 | JBPV s.r.o. | Method of obtaining terephthalic acid from waste polyethylene terephthalate |
| WO2020053051A1 (en) * | 2018-09-12 | 2020-03-19 | Rittec Umwelttechnik Gmbh | Method, device and use for reprocessing substantially polyalkylene terephthalate |
| RU2797584C1 (en) * | 2022-04-29 | 2023-06-07 | Роман Александрович Чешун | Processing method for polyethylene terephthalate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993023465A1 (en) * | 1992-05-18 | 1993-11-25 | Petwest Pty. Ltd. | Improved poly ethylene terephthalate decontamination |
| JP2002060542A (en) * | 2000-08-17 | 2002-02-26 | Teijin Ltd | Method for recovering useful component from polyester waste |
| JP2002060369A (en) * | 2000-08-17 | 2002-02-26 | Teijin Ltd | Method for recycling polyester waste |
| JP2003128626A (en) * | 2001-10-16 | 2003-05-08 | Teijin Ltd | Method for recovering terephthalic acid from polyester fiber waste |
| US20050004390A1 (en) * | 2001-10-16 | 2005-01-06 | Takuo Nakao | Method for recycling pet bottle |
-
2014
- 2014-06-10 PL PL408500A patent/PL228319B1/en unknown
- 2014-12-17 WO PCT/PL2014/000141 patent/WO2015190941A1/en active Application Filing
- 2014-12-17 EP EP14830737.4A patent/EP3155038A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993023465A1 (en) * | 1992-05-18 | 1993-11-25 | Petwest Pty. Ltd. | Improved poly ethylene terephthalate decontamination |
| JP2002060542A (en) * | 2000-08-17 | 2002-02-26 | Teijin Ltd | Method for recovering useful component from polyester waste |
| JP2002060369A (en) * | 2000-08-17 | 2002-02-26 | Teijin Ltd | Method for recycling polyester waste |
| JP2003128626A (en) * | 2001-10-16 | 2003-05-08 | Teijin Ltd | Method for recovering terephthalic acid from polyester fiber waste |
| US20050004390A1 (en) * | 2001-10-16 | 2005-01-06 | Takuo Nakao | Method for recycling pet bottle |
Non-Patent Citations (2)
| Title |
|---|
| DATABASE WPI Week 200243, Derwent World Patents Index; AN 2002-398850, XP002737861 * |
| DATABASE WPI Week 200245, Derwent World Patents Index; AN 2002-420553, XP002737862 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019174656A1 (en) | 2018-03-12 | 2019-09-19 | JBPV s.r.o. | Method of obtaining terephthalic acid from waste polyethylene terephthalate |
| WO2020053051A1 (en) * | 2018-09-12 | 2020-03-19 | Rittec Umwelttechnik Gmbh | Method, device and use for reprocessing substantially polyalkylene terephthalate |
| RU2797584C1 (en) * | 2022-04-29 | 2023-06-07 | Роман Александрович Чешун | Processing method for polyethylene terephthalate |
Also Published As
| Publication number | Publication date |
|---|---|
| PL408500A1 (en) | 2015-12-21 |
| PL228319B1 (en) | 2018-03-30 |
| EP3155038A1 (en) | 2017-04-19 |
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