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SE546629C2 - Process and system for mixed fabric rejuvination - Google Patents

Process and system for mixed fabric rejuvination

Info

Publication number
SE546629C2
SE546629C2 SE2350824A SE2350824A SE546629C2 SE 546629 C2 SE546629 C2 SE 546629C2 SE 2350824 A SE2350824 A SE 2350824A SE 2350824 A SE2350824 A SE 2350824A SE 546629 C2 SE546629 C2 SE 546629C2
Authority
SE
Sweden
Prior art keywords
polyester
monomeric
phase
outlet
residues
Prior art date
Application number
SE2350824A
Other languages
Swedish (sv)
Other versions
SE2350824A1 (en
Inventor
Henrik Wene
Niklas Jakobsson
Original Assignee
Rewin Textiles AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rewin Textiles AB filed Critical Rewin Textiles AB
Priority to SE2350824A priority Critical patent/SE546629C2/en
Priority to PCT/SE2024/050429 priority patent/WO2024128967A2/en
Priority to CN202480039508.4A priority patent/CN121358800A/en
Publication of SE2350824A1 publication Critical patent/SE2350824A1/en
Publication of SE546629C2 publication Critical patent/SE546629C2/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—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
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/02—Crystallisation from solutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
    • B01J8/004—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor by means of a nozzle
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
    • C07C69/76—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
    • C07C69/80—Phthalic acid esters
    • C07C69/82—Terephthalic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • 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
    • C08J11/14—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 steam or water
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
    • C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
    • C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
    • C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D11/00—Solvent extraction
    • B01D2011/007—Extraction using a solvent in the gas phase
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
    • 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
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01—Natural vegetable fibres
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01—Natural vegetable fibres
    • D10B2201/02—Cotton
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • 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)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Woven Fabrics (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention pertains to a method for mixed fabric fiber rejuvenation, wherein the method comprises the steps of adding ethylene glycol (EG) in gas phase at a temperature of between 190° to 250° C trough vapour injection to a fabric fibre material comprising polyester and natural fibre material, whereby at least partly depolymerising the polyester material to monomeric and oligomeric polyester residues, the monomeric and oligomeric polyester residues being dissolved in condensed, excess of liquid EG; optionally adding liquid phase EG, recovering a solvent phase, comprising the monomeric and oligomeric polyester residues and unreacted EG, and an essentially polyester-free natural fibre as a solid product; and optionally separating the solvent phase, comprising the monomeric and oligomeric polyester residues and unreacted EG, from the solid product, comprising essentially polyester-free natural fibre. Further is provided a system (100) for mixed fabric fiber rejuvenation of a mixed fabric fibre material comprising polyester and natural fibre material.

Claims (32)

Claims
1. A method for mixed fabric fiber rejuvenation, Wherein the method comprises the steps of: - adding ethylene glycol (EG) in gas phase at a temperature of between 190° to 250° C trough Vapour injection to a fabric fibre material comprising polyester and natural fibre material, Whereby at least partly depolymerising the polyester material to monomeric and oligomeric polyester residues, the monomeric and oligomeric polyester residues being dissolved in condensed, excess of liquid EG; - optionally adding liquid phase EG, - recoVering a solVent phase, comprising the monomeric and oligomeric polyester residues and unreacted EG, and an essentially polyester-free natural fibre as a solid product; and - optionally separating the solVent phase, comprising the monomeric and oligomeric polyester residues and unreacted EG, from the solid product, comprising essentially polyester-free natural fibre.
2. The method according to claim 1, Wherein the monomeric polyester residues are bis(hydroxyethyl) terephthalate (BHET).
3. The method according to any one of claims 1 to 2, Wherein the temperature ofthe EG Vapour injection is between 195 °C and 240 °C.
4. The method according to any one of claims 1 to 3, Wherein the temperature ofthe EG Vapour injection is between 197 °C and 220 °C.
5. The method according to any one of claims 1 to 4, Wherein a gas phase is WithdraWn, and separating any non-EG components in the gas phase from EG and reintroducing the separated EG to the fabric fibre material comprising polyester and natural fibre material, Whereby the EG in the gas phase is recycled.
6. The method according to claim 5, Wherein the EG in the gas phase is continuously recycled.
7. The method according to any one of claims 5 to 6, Wherein non-EG components in the gas phase are separated from EG by condensation.
8. The method according to any one of claims 1 to 7, Wherein the solVent phase, comprising the monomeric and oligomeric polyester residues and unreacted EG is separated from the solid product, comprising essentially polyester-free natural fibre, preferably through filtering.
9. The method according to any one of claims 1 to 8, Wherein the recovered liquid solvent phase is cooled to a temperature of 100° C to 140° C and filtered, Whereby contaminants With higher precipitation temperatures than monomeric and oligomeric polyester residues are separated from the solvent phase comprising monomeric and oligomeric polyester residues and EG.
10. The method according to any one of claims 1 to 8, Wherein the recovered solvent phase is cooled down to a temperature of less than 50 °C, such as between 10 to 50 °C, thereby precipitating monomeric and oligomeric polyester residues, and thereafter separating the precipitated monomeric and oligomeric polyester residues from the solvent phase.
11. The method according to any one of claims 1 to 10, Wherein a portion of the EG in the recovered solvent phase is evaporated to generate EG vapour, thereby concentrating the monomeric and oligomeric polyester residues in the solvent phase.
12. The method according to claim 1 to 11, Wherein a portion ofthe EG in the recovered solvent phase is reclaimed through distillation, thereby concentrating monomeric and oligomeric polyester residues in the solvent phase and generating EG Vapour.
13. The method according to claim 11 or 12, Wherein the evaporation or distillation takes place at a superatmospheric pressure to generate ethylene glycol (EG) in gas phase at a temperature of between 190° to 250° C, and Wherein the generated EG vapour is used for Vapour injection to the fabric fibre material comprising polyester and natural fibre material.
14. The method according to any one of claims 1 to 13, wherein the mixed fabric fiber, the gas phase and the solvent phase are agitated to ensure an even temperature distribution during the depolymerization.
15. The method according to any one of claims 1 to 14, wherein the resulting essentially polyester-free natural fibre is washed to remove monomeric and oligomeric polyester residues to obtain a purified natural fiber.
16. The method according to any one of claims 1 to 15, wherein the natural fibre material comprises fibers that are more hygroscopic than polyester fibers.
17. The method according to any one of claims 1 to 16, wherein the natural fibre material are selected from the group consisting of plant-based materials, such as cotton, linen, bamboo, and jute, man-made cellulosic fibers, such as viscose and lyocell, animal-based fibers, such as silk and wool; preferably the natural fiber material is cotton.
18. The method according to any one of claims 1 to 17, wherein the percentage of natural fiber in the mixed fabric fiber is at least 1 wt.-%, such as at least 5 wt.-%, such as at least 10 wt.-%, such as at least 20 wt.-%, such as at least 50 wt.-%, such as between 1 wt.-% to 99 wt.-%, such as between 5 wt.-% towt.-%, such as between 1 to 50 wt.% or between 50 wt.-% and 99 wt.-%.
19. The method according to any one of claims 1 to 18, wherein the percentage of polyester in the mixed fabric fiber is at least 1 wt.-%, such as at least 5 wt.-%, such as at least 20 wt.-%, such as at least 50 wt.-%, such as from between 1 wt.-% to 99 wt.-%, such as from between 5 wt.-% to 95 wt.-%, such as between 1 to 50 wt.% or between 50 wt.-% and 99 wt.-%.
20. The method according to any one of claims 1 to 19, wherein the heat is provided through the injected EG vapour.
21. The method according to any one of claims 1 to 19, Wherein additional heat is added in the method through additional heats sources, such as through pre-heating ofthe mixed fabric fiber and/or optional liquid EG, or through use of an external heat source, such a heat mantle or use of micro-Waves.
22. The method according to any one of claims 1 to 21, Wherein the method is run in batches.
23. The method according to any one of claims 1 to 22, Wherein the monomeric polyester residue level in the solvent phase is monitored, a stabile monomeric polyester residue:EG ratio in the solvent phase indicating that all polyester has been depolymerized, Whereby the solvent phase and the essentially polyester-free natural fibre is recovered.
24. The method according to any one of claims 1 to 23, Wherein the mass ratio (Wt./Wt.) between polyester and EG is in the range of 1:3 to 1:9, preferably 1:3.7 to 1:6, more preferably 1:4 to 1:
25. A system (100) for mixed fabric fiber rejuVenation of a mixed fabric fibre material comprising polyester and natural fibre material, the system comprising at least one depolymerization Vessel (1) for at least partly depolymerising the polyester to monomeric and oligomeric polyester residues, « (IG Wherein the depolymerization Vessel (1) comprises; at least one feed inlet (2) for feeding a mixed fabric fiber material comprising polyester and natural fiber material to the Vessel, at least one EG Vapour inlet (3) for injecting EG in gas phase at a temperature of between 190° to 250° C into the Vessel, at least one EG liquid inlet (4) for injecting liquid EG into the Vessel, and at least one outlet (5) for recovering monomeric and oligomeric polyester residues, unreacted EG and essentially polyester-free natural fiber material, eliaracíerized in that the systern i E00) further coinprises ~~\~ n “l ivwi- ~ ~ 3:07 ÉÉÃÉÃ? lifiïtfifïdfxs: \.ß\.-::.t~_.~\.~:s\,;n.\ in u, .ac-.L ævheffeir: tfne the depoivnieriïcatitßt: sfesseä (1) fiirthei' eonipiises; ff i_f>ß+,«._ n1+iuf¿'\? vw) .fw vwfvv-»w nn; m-W-q; få wl n- v» a s win-L x «\ n: 3.1; U vvuv Lib 1 i x in., s 1 1,7; x :Lv at least one gas Outlet (7) for removing the gas phase, and at least one EG inlet (8) for reintroducing separated liquid EG, Whereby the EG in the gas phase is recycled, Wherein the vapour phase recycling column (6) comprises; at least one gas inlet (9) connected to the gas outlet (7) ofthe depolymerization Vessel (1), at least one EG liquid outlet (10) connected to the EG liquid inlet (8) depolymerization Vessel (1), a gas outlet (25), a liquid inlet (26), and Wherein the partial condenser (24) comprises; at least one gas inlet (27) connected to the gas outlet (25) ofthe Vapour phase recycling column (6), at least one EG liquid outlet (28) connected to the liquid inlet (26) ofthe vapour phase recycling column (6), and at least one non-EG gas outlet (11) for removal of any non-EG components.
26. A system (100) according to claim 25, Wherein the depolymerization Vessel (1) may be operated at atmospheric pressure or superatmospheric pressure.
27. The system (100) according to any one of claims 25 to 26, further comprising a separation means (12) for separating a solVent phase comprising the monomeric and oligomeric polyester residues and unreacted EG from a solid product comprising an essentially polyester-free natural fiber, the separation means (12) comprising an inlet (13) connected to the outlet (5) ofthe depolymerization Vessel (1), a solVent outlet (14) and a solids outlet (15).
28. The system (100) according to claim 27, Wherein the separation means (12) is a filter.
29. The system (100) according to any one of claims 27 to 28, further comprising at least one contaminant precipitation Vessel (29) for cooling the recoVered liquid solVent phase and precipitating contaminants With higher precipitation temperatures than the monomeric and oligomeric polyester residues from the solVent phase, comprising an inlet (30) connected, directly or indirectly, to the solVent outlet (14) ofthe separation means (12), a solVent outlet (31) and a precipitant outlet (32) for contaminants With higher precipitation temperatures than the monomeric and oligomeric polyester residues; preferably the contaminant precipitation Vessel (29) is arranged downstream of the separation means (12).
30. The system (100) according to any one of claims 27 to 29, further comprising at least one precipitation and separation Vessel (16), for precipitating monomeric and oligomeric polyester residues, and for separating said precipitated monomeric and oligomeric polyester residues from the solVent phase, the precipitation and separation Vessel (16) comprising an inlet (17) connected, directly or indirectly, to the solvent outlet (14) of the precipitation means (12), a solVent outlet (18) and a precipitant outlet (19).
31. The system (100) according to any one of claims 27 to 30, further comprising an EG recycling column (20), for generating EG Vapour and concentrating any remaining monomeric and oligomeric polyester residues, comprising a liquid phase inlet (21), an EG Vapour outlet (22) connected to the EG Vapour inlet (3) ofthe depolymerization Vessel (1), and an outlet (23) for concentrated monomeric and oligomeric polyester residues.
32. The system (100) according to claim 31, Wherein the liquid phase inlet (21) of the a EG recycling column (20) is connected to the solVent outlet (14) of the filter (12), or the solVent outlet (18) of the precipitation and separation Vessel (16), or the solVent outlet (31) of the contaminant precipitation Vessel (29).
SE2350824A 2023-06-30 2023-06-30 Process and system for mixed fabric rejuvination SE546629C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE2350824A SE546629C2 (en) 2023-06-30 2023-06-30 Process and system for mixed fabric rejuvination
PCT/SE2024/050429 WO2024128967A2 (en) 2023-06-30 2024-05-06 Process for mixed fabric rejuvination
CN202480039508.4A CN121358800A (en) 2023-06-30 2024-05-06 Method for hybrid fabric rejuvenation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2350824A SE546629C2 (en) 2023-06-30 2023-06-30 Process and system for mixed fabric rejuvination

Publications (2)

Publication Number Publication Date
SE2350824A1 SE2350824A1 (en) 2024-05-10
SE546629C2 true SE546629C2 (en) 2025-01-02

Family

ID=91081912

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2350824A SE546629C2 (en) 2023-06-30 2023-06-30 Process and system for mixed fabric rejuvination

Country Status (3)

Country Link
CN (1) CN121358800A (en)
SE (1) SE546629C2 (en)
WO (1) WO2024128967A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4674903A1 (en) * 2024-07-05 2026-01-07 Reju Method of recycling compositions comprising polyester and cellulose-containing fibers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174062A2 (en) * 1984-05-25 1986-03-12 Toray Industries, Inc. Process for the depolymerization of polyester scrap
US6706843B1 (en) * 1999-10-22 2004-03-16 Teijin Limited Method for separating and recovering dimethyl terephthalate and ethylene glycol from polyester waste
EP2784110A1 (en) * 2013-03-26 2014-10-01 Oxxynova GmbH Method and apparatus for colour removal from shredded PET-flakes
CN108085854A (en) * 2017-12-29 2018-05-29 杭州联成华卓实业有限公司 Recycle the production technology of terylene and cotton blended fabric

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707563B1 (en) * 1993-07-05 1999-02-17 E.I. Du Pont De Nemours And Company Production of dicarboxylic acids or esters thereof
US11787917B2 (en) 2020-12-02 2023-10-17 International Business Machines Corporation Recycling process for the recovery of cotton from polyester-cotton fabrics and/or fibers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174062A2 (en) * 1984-05-25 1986-03-12 Toray Industries, Inc. Process for the depolymerization of polyester scrap
US6706843B1 (en) * 1999-10-22 2004-03-16 Teijin Limited Method for separating and recovering dimethyl terephthalate and ethylene glycol from polyester waste
EP2784110A1 (en) * 2013-03-26 2014-10-01 Oxxynova GmbH Method and apparatus for colour removal from shredded PET-flakes
CN108085854A (en) * 2017-12-29 2018-05-29 杭州联成华卓实业有限公司 Recycle the production technology of terylene and cotton blended fabric

Also Published As

Publication number Publication date
CN121358800A (en) 2026-01-16
WO2024128967A3 (en) 2025-01-30
WO2024128967A2 (en) 2024-06-20
SE2350824A1 (en) 2024-05-10

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