WO2025074037A1 - Procédé de flottation pour séparer des fibres, et utilisation d'une composition tensioactive dans le traitement de fibres textiles recyclées - Google Patents

Procédé de flottation pour séparer des fibres, et utilisation d'une composition tensioactive dans le traitement de fibres textiles recyclées Download PDF

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Publication number
WO2025074037A1
WO2025074037A1 PCT/FI2024/050522 FI2024050522W WO2025074037A1 WO 2025074037 A1 WO2025074037 A1 WO 2025074037A1 FI 2024050522 W FI2024050522 W FI 2024050522W WO 2025074037 A1 WO2025074037 A1 WO 2025074037A1
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WIPO (PCT)
Prior art keywords
surfactant
fibres
ethoxylated
flotation
synthetic
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PCT/FI2024/050522
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English (en)
Inventor
Jean-Francois D'allest
Tea HANNUKSELA
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Kemira Oyj
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Kemira Oyj
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/008—Organic compounds containing oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/0043—Organic compounds modified so as to contain a polyether group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/016—Macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/02—Collectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/04—Frothers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; Specified applications
    • B03D2203/001—Agricultural products, food, biogas, algae

Definitions

  • the present invention relates to a method for separating synthetic, noncellulose fibres from cellulose fibres in processing recycled textile fibres.
  • the invention also relates to a surfactant composition for use in flotation in a process of recycling textile fibres.
  • Recycled textile waste comprises both synthetic, non-cellulose fibres and cellulose fibres.
  • Fibres suspension in water issued from recycled textile is a low foaming material and therefore, one technical problem is to raise enough foam in the
  • an object of the present invention to provide an improved method for separating by flotation cellulose fibres from non-cellulose fibres in processing recycled textile fibres with a high selectivity. Further, an object of the present invention is to provide a surfactant or a combination of the surfactants to help raising enough foam in the flotation stage and to provide an improved flotation selectivity in a separation of synthetic, non-cellulose fibres from cellulose fibres by flotation, with minimum loss of cellulose fibres.
  • Typical method according to the present invention for separating synthetic, non-cellulose fibres from cellulose fibres in processing recycled textile fibres comprising
  • the surfactant comprises at least a main surfactant comprising a synthetic non-ionic surfactant selected from a group consisting of ethoxylated or ethoxylated and propoxylated fatty alcohols or fatty acids having chain length of C14 - C24, and any mixtures thereof.
  • the invention also relates use of a surfactant composition
  • a surfactant composition comprising at least a main surfactant comprising a synthetic non-ionic surfactant selected from a group consisting of ethoxylated or ethoxylated and propoxylated fatty alcohols or fatty acids having a chain length of C14 - C24, and any mixtures thereof, in flotation in processing recycled textile fibres, in which synthetic, non-cellulose fibres are separated from cellulose fibres.
  • the specific main surfactant or a combination of the specific main surfactant with certain co-surfactants is efficient for improving flotation selectivity in a separation of the synthetic, non-cellulose fibres from cellulose fibres in flotation when processing recycled textile fibres. It has been observed that a main surfactant comprising non-ionic ethoxylated or ethoxylated and propoxylated fatty alcohols or fatty acids and having high molecular weight is especially efficient for improving flotation selectivity with a minimum loss of cellulosic fibres.
  • Fibres suspension in water issued from recycled textile is a low foaming material and by a method according to the present invention the foaming of the aqueous textile fibres suspension can be increased for providing efficient separation of the synthetic, non-cellulose fibres from cellulose fibres.
  • the more hydrophobic and lighter synthetic, non-cellulose fibres are captured and entrained by the air bubbles, and then they can be removed on the top of a flotation cell.
  • a surfactant comprising a hydrophilic part and hydrophobic part is used when separating by flotation synthetic, non- cellulose fibres from cellulose fibres.
  • a surfactant according to the present invention comprises at least a main surfactant comprising a synthetic non- ionic surfactant selected from a group consisting of ethoxylated fatty alcohols or fatty acids having a chain length of C14 - C24, or ethoxylated and propoxylated fatty alcohols or fatty acids having a chain length of C14 - C24, or any mixtures thereof.
  • a main surfactant may comprise ethoxylated fatty alcohol(s) or fatty acid(s) having a chain length of C14 - C24.
  • a main surfactant may comprise ethoxylated and propoxylated fatty alcohol(s) or fatty acid(s) having a chain length of C14 - C24.
  • the ethoxylated or the ethoxylated and propoxylated fatty alcohols or fatty acids has preferably a chain length of C16 - C20.
  • the long chain length of the hydrocarbon chain improves the collection of the hydrophobic synthetic, non-cellulose fibres onto the air bubbles in flotation. Further, the combination of ethoxylation and propoxylation of the fatty alcohol or fatty acid is effective to balance foam control and collection efficiency.
  • Hydrocarbon chain of the ethoxylated or the ethoxylated and propoxylated fatty alcohols or fatty acids can be linear or branched. Further, the hydrocarbon chain of the fatty alcohols or fatty acids may be saturated or unsaturated.
  • a main surfactant comprises ethoxylated or ethoxylated and propoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C14 - C24, preferably a chain length of C16 - C20, more preferably a main surfactant comprises ethoxylated and propoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C14 - C24 or C16 - C20.
  • the main surfactant has a high degree of ethoxylation, or a high degree of ethoxylation and propoxylation.
  • the high degree of the ethoxylation and propoxylation improves main surfactant selectivity to collect synthetic, non-cellulose fibres.
  • ethoxylated or ethoxylated and propoxylated fatty alcohols or fatty acids contain ethylene oxide (EO) moieties.
  • EO ethylene oxide
  • a degree of ethoxylation of the ethoxylated or the ethoxylated and propoxylated fatty alcohols or fatty acids may be in the range of 5 to 100 ethylene oxide (EO) moieties, preferably 10 to 40 EO moieties.
  • ethoxylated and propoxylated fatty alcohols or fatty acids contain propylene oxide (PO) moieties.
  • a degree of propoxylation of the ethoxylated and propoxylated fatty alcohols or fatty acids may be in the range of 1 to 40 propylene oxide (PO) moieties, preferably 5 to 20 PO moieties.
  • the distribution of the EO and PO moieties in the ethoxylated and propoxylated fatty alcohols or fatty acids can be statistical (random) or in blocks.
  • the blocks structure of the hydrophilic moiety is preferred, since it has been observed to better balance foam control and collection selectivity in the foaming.
  • the ethoxylated and propoxylated part of the non-ionic surfactant can be terminated or not with a PO moiety.
  • the termination with a PO group is preferred, which also has been observed to better balance foam control and collection selectivity in the foaming.
  • the ethoxylated and propoxylated hydrophilic moiety of the fatty alcohols or fatty acids has a blocks structure, and is terminated with a PO group.
  • the main surfactant has a cloud point temperature which can be any temperature in between 20°C and 100°C.
  • the main surfactant has a cloud point temperature, which differs from the flotation temperature of the textile fibres suspension in maximum of 0°C to -10°C, preferably in maximum of 0°C to -5°C.
  • the cloud point temperature of the main surfactant is substantially equal to the flotation temperature of the fibre suspension.
  • the cloud point temperature of the main surfactant in slightly below the flotation temperature of the textile fibres suspension improves the efficacy and flotation selectivity of the main surfactant.
  • the cloud point temperature of the main surfactant may be maximum of 10°C, preferably maximum of 5°C lower than the flotation temperature of the textile fibres suspension in a flotation stage.
  • flotation temperature in processing recycled textile fibres may be in the range of 50 - 70°C, preferably 55 - 65°C, and hence the cloud point temperature of the main surfactant may be in the range of 40 - 70°C or 45 - 70°C, and preferably 45 - 65°C or 50 - 65°C.
  • the cloud point temperature of the non-ionic surfactant is the temperature above which the surfactant is not water soluble anymore and precipitates as microparticles dispersed in the water phase.
  • a main surfactant is added to a textile fibres suspension in an amount of 0.05 to 10 kg/t (ton) of textile fibres.
  • a main surfactant is added to the textile fibres suspension in an amount of 0.1 to 3 kg/t (ton) of textile fibres.
  • Textile fibres suspension which are naturally a very poorly foaming material, may require the addition of the co-surfactant in combination with the main surfactant into the textile fibres suspension for increasing the amount of the foam.
  • a main surfactant is used in combination with at least one co-surfactant to control the amount of the foam and increase the removal of the synthetic, non-cellulose fibres at the same time.
  • the co- surfactant comprises non-ionic and/or anionic surfactant.
  • a method according to the present invention further comprises adding at least one co- surfactant comprising non-ionic and/or anionic surfactant.
  • a co-surfactant may comprise non-ionic biobased surfactant.
  • the co-surfactant is added first to increase and control the amount of the foam in the flotation stage.
  • a co-surfactant has a hydrophilic-lipophilic balance (HLB) > 7.
  • a non-ionic co-surfactant comprises the ethoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C4 - C18, preferably a chain length of C8 - C14.
  • the non-ionic co-surfactant comprising ethoxylated fatty alcohol(s) or fatty acid(s) has a degree of ethoxylation in the range of 3 to 100 ethylene oxide (EO) moieties, preferably 5 to 20 EO moieties.
  • the co-surfactant has a cloud point temperature which can be any temperature in between 20°C and 100°C.
  • the non-ionic co-surfactant comprising ethoxylated fatty alcohol(s) or fatty acid(s) has a cloud point temperature, which differs from a flotation temperature of the textile fibres suspension in maximum of 0°C to -15°C, preferably in maximum of 0°C to -10°C for improving the efficacy of the co-surfactant.
  • an anionic cosurfactant can be any anionic surfactant known in the art.
  • Anionic cosurfactant according to an embodiment of the present invention comprises anionic synthetic surfactant.
  • Anionic co-surfactants contain anionic functional groups at their head, such as sulphate, sulphonate, phosphate and carboxylate.
  • Anionic co-surfactants can be soaps.
  • Anionic co-surfactants may also incorporate ethylene oxide groups.
  • Anionic co-surfactant may comprise one anionic surfactant or it may be a combination of two or more anionic surfactants.
  • an anionic co-surfactant comprises sodium dodecyl sulphate (SDS).
  • SDS sodium dodecyl sulphate
  • Anionic co-surfactants are commonly cheap chemicals and very foaming at low dosages, wherein they are preferably used in flotation.
  • the method comprises adding a co-surfactant comprising non-ionic biobased surfactant.
  • the hydrophilic part of the biobased surfactant can be different kind of sugar heads.
  • non-ionic biobased co-surfactant is selected from a group consisting of alkyl poly glycosides (APG), alkyl poly pentosides (APP) and any mixtures thereof.
  • APG alkyl poly glycosides
  • APP alkyl poly pentosides
  • the biobased co-surfactant can be used alone in combination with the main surfactant, or the surfactant used in the present invention may comprise main surfactant and non-ionic biobased co-surfactant and synthetic non-ionic and/or anionic co-surfactant.
  • Biobased surfactants are from renewable resources, and they are more biodegradable and less toxic than synthetic ethoxylated fatty alcohol-based surfactants. Biobased surfactants are more sustainable than standard synthetic non-ionic surfactants.
  • a co-surfactant is added to a textile fibres suspension in an amount of 0.01 to 5 kg/t (ton) of textile fibres.
  • a co- surfactant is added to the textile fibres suspension in an amount of 0.05 to 2 kg/t (ton) of textile fibres.
  • a main surfactant is used in combination with non-ionic synthetic co-surfactant, wherein
  • the main surfactant comprises ethoxylated or ethoxylated and propoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C14 - C24, preferably a chain length of C16 - C20, more preferably a main surfactant comprises ethoxylated and propoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C14 - C24 or C16 - C20, and
  • non-ionic synthetic co-surfactant comprises the ethoxylated fatty alcohol(s) or fatty acid(s) having a linear and saturated hydrocarbon chain with a chain length of C4 - C18, preferably a chain length of C8 - C14.
  • a method for separating by flotation synthetic, non-cellulose fibres from cellulose fibres in processing recycled textile fibres comprising
  • a method further comprises adding a co-surfactant, which may comprise non-ionic and/or anionic surfactant and/or non-ionic biobased surfactant as described above.
  • the cosurfactants are commonly added to the textile fibres suspension prior to a flotation stage.
  • the main surfactant and co-surfactant(s) can be added in a form of pre-mixture or they may be added separately to the textile fibres suspension.
  • the main surfactant and the co-surfactant(s) are added separately to control the dosage of each surfactant individually.
  • Textile fibres suspension issued from recycled textile comprises cellulose fibres and synthetic, non-cellulose fibres.
  • Cellulose fibres include all fibres originating from natural sources, such as e.g. cotton, linen, jute, wool, wood, etc. and all modified cellulose forms.
  • the non-cellulose fibres are synthetic fibres comprising man-made polymers. Examples of synthetic fibres comprising man-made polymers include but are not limited to fibres based on nylon, fibres based on polyester, fibres based on acrylic, fibres based on modacrylic, fibres based on polyurethane, and fibres based on polyolefin.
  • the non-cellulose fibres comprise polyester.
  • the non-cellulose fibres comprise elastane.
  • the non-cellulose fibres comprise polyacrylonitrile.
  • Cellulose fibres are commonly mixed with smaller amounts of synthetic, non-cellulose fibres in commercially available textiles.
  • Textile fibres suspension may also comprise other non-cellulose fibres that are desired to remove.
  • the textile fibres suspension comprises a high fraction of cellulose fibres with smaller quantities of non- cellulose fibres.
  • the maximum length of the textile fibres in the textile fibres suspension is a few millimetres.
  • a maximum length of the fibres in the textile fibres suspension is in the range of 1 - 5 mm or 2 - 5 mm.
  • the textile fibres suspension has a concentration of synthetic, non-cellulose fibres in the range of 0.1 % to 20%, calculated by the weight of the total fibres fraction.
  • the concentration of the textile fibres in the aqueous textile fibres suspension in the feed of the flotation cell is typically in the range of 0.1 - 2 weight-%, preferably 0.2 - 1 weight-%, calculated by the weight of the total textile fibres suspension.
  • - Surfactant A ethoxylated and propoxylated fatty alcohol. Linear saturated C16-20, 21 EO, 9PO, block structure of the hydrophilic moiety. PO terminated. Cloud point 58°C.
  • Surfactant D anionic surfactant (soap), tall oil fatty acid (mainly oleic and linoleic fatty acids) partially saponified (35%) with potassium hydroxide.
  • Surfactant E anionic surfactant, sodium dodecyl sulphate (SDS).
  • Surfactant F biobased surfactant, octyl and decyl glucoside.
  • Surfactant G biobased surfactant, octyl and hexadecyl glucoside.
  • - Surfactant H biobased surfactant, C8-12 alkylglycosides D-pentose, D- glucose.
  • composition of the sheets of textile fibres cellulosic fibres and 1-10% of synthetic fibres, calculated by the weight of the total composition.
  • the textile fibres are dispersed in water to make a fibres pulp with a concentration of 10%. This dispersion is made with a Hobart lab mixer model H600T, at a temperature of about 40°C, with a pulping time of 30 minutes at speed 3.
  • the pH of the fibres dispersion is about 8.0.
  • a sample of the fibres pulp from the pulping step (named later on: initial fibres pulp) is weighted and then diluted with hot water into a Voith Delta 25 lab flotation cell, which has a total capacity of 23 litres.
  • the final fibres pulp concentration after complete dilution and before flotation is about 0.30%.
  • the temperature of the water used for dilution is adjusted according to the desired flotation temperature.
  • the total mass of flotation rejects is measured.
  • a sample of the rejects is weighted, filtered on a MonodurTM Woven Mesh (synthetic fabric), and dried in an oven at 70°C overnight to determine the textile fibres concentration in the rejects, and further the total mass of dry fibres rejects.
  • the dried sample of fibres is then mixed with concentrated sulfuric acid (75%) to dissolve the cellulosic fibres fraction.
  • the non dissolved fibres fraction i.e. the synthetic fibres
  • the non dissolved fibres fraction is then filtered on a glass frit (Por 2), rinsed with water, dried at 70°C overnight, and weight. This allows the calculation of the mass fraction of synthetic fibres in the dry fibres rejects, and further the total mass of dry synthetic fibres in the total mass of dry fibres rejects.
  • the same method is applied to determine the fraction of the synthetic fibres in the initial fibres pulp.
  • the flotation yield is calculated the following way:
  • Flotation yield (%) 100 x (total mass of initial dry fibres pulp - total mass of dry fibres rejects) / (total mass of initial dry fibres pulp).
  • the surfactant A shows a much higher flotation selectivity, with a much higher synthetic fibres removal efficiency along with a small reduction of the flotation yield. Best flotation selectivity with surfactant A is achieved at dosages between 1 .1 and 4.5 kg/t.
  • the surfactant D shows a much lower flotation selectivity, with a lower synthetic fibres removal efficiency and a slightly lower flotation yield.
  • the surfactants A and B Compared to the surfactant D, the surfactants A and B, at flotation temperature just above their respective cloud points, show much higher flotation selectivity thanks to a much higher synthetic fibres removal efficiency.
  • the surfactant C shows a lower flotation selectivity despite a higher synthetic fibres removal efficiency, due to a lower flotation yield.
  • the surfactant C has a stronger foaming power than the surfactant A (more foam rejects involving a lower flotation yield).
  • the surfactants F and G (alkyl polyglucosides), and the surfactants H, I and J (alkyl polypentosides) show all a lower flotation selectivity, with a much lower synthetic fibres removal efficiency and/or a lower flotation yield.
  • the surfactant G shows the best results with a higher synthetic fibres removal efficiency but a lower flotation yield compared to surfactant A.
  • the surfactant C and to a lower extent the surfactant A show a lower flotation selectivity at this lower flotation temperature due to a much lower flotation yield, despite a higher synthetic fibres removal efficiency.
  • the surfactants A and C are more foaming, i.e. more foam rejects, and less effective as collectors of the synthetic fibres.
  • the surfactant A achieves a higher flotation selectivity than the surfactant C: higher synthetic fibres removal efficiency at about same total flotation yield.
  • the surfactants F and G alkyl polyglucosides
  • the surfactants H, I and J alkyl polypentosides
  • Flotation trials are done with an initial pulp concentration of 0.32% and at a temperature of 62°C or 42°C.
  • the tested surfactants, the surfactants dosages, the flotation temperature, and the results are gathered in Table 5.
  • Surfactant E combined with either surfactant B or surfactant A at flotation temperature just above their respective cloud points, achieves a much higher flotation selectivity than the surfactant E alone: higher synthetic fibres removal efficiency at about same total flotation yield.
  • Flotation trials are done with an initial pulp concentration of 0.30% and at a temperature of 63°C or 45°C.
  • the tested surfactants, the surfactants dosages, the flotation temperature, and the results are gathered in Table 6.
  • surfactant D a soap
  • a solution of sodium hydroxide (20%) is added (20 kg/t) to the flotation cell to increase the surfactant efficiency.

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Abstract

Procédé de séparation de fibres synthétiques et non cellulosiques de fibres de cellulose dans le traitement de fibres textiles recyclées, le procédé consistant à ajouter au moins un tensioactif à la suspension aqueuse de fibres textiles et à soumettre la suspension aqueuse de fibres textiles à une flottation pour éliminer les fibres synthétiques non cellulosiques. Le tensioactif comprend au moins un tensioactif principal comprenant un tensioactif non ionique synthétique choisi dans un groupe constitué d'alcools gras ou d'acides gras éthoxylés ou éthoxylés et propoxylés ayant une longueur de chaîne de C14 - C24, et de quelconques mélanges de ceux-ci.
PCT/FI2024/050522 2023-10-05 2024-10-04 Procédé de flottation pour séparer des fibres, et utilisation d'une composition tensioactive dans le traitement de fibres textiles recyclées Pending WO2025074037A1 (fr)

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FI20236105 2023-10-05
FI20236105 2023-10-05

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070107859A1 (en) * 2003-11-12 2007-05-17 Kemira Chemicals, Inc. Deinking blends for use in reduced alkali systems
WO2013182801A1 (fr) 2012-06-06 2013-12-12 Fibers Procédé de séparation du polyester et du coton pour le recyclage de déchets textiles
WO2019138101A1 (fr) 2018-01-15 2019-07-18 Lenzing Aktiengesellschaft Procédé pour la séparation d'un composant cible fibreux à partir de déchets textiles
WO2020127453A1 (fr) 2018-12-19 2020-06-25 Re:Newcell Ab Séparation de fibres
WO2022136724A1 (fr) * 2020-12-23 2022-06-30 Valmet Technologies Oy Procédé de traitement de fibres textiles recyclées et système de processus de traitement de fibres textiles recyclées

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070107859A1 (en) * 2003-11-12 2007-05-17 Kemira Chemicals, Inc. Deinking blends for use in reduced alkali systems
WO2013182801A1 (fr) 2012-06-06 2013-12-12 Fibers Procédé de séparation du polyester et du coton pour le recyclage de déchets textiles
WO2019138101A1 (fr) 2018-01-15 2019-07-18 Lenzing Aktiengesellschaft Procédé pour la séparation d'un composant cible fibreux à partir de déchets textiles
WO2020127453A1 (fr) 2018-12-19 2020-06-25 Re:Newcell Ab Séparation de fibres
WO2022136724A1 (fr) * 2020-12-23 2022-06-30 Valmet Technologies Oy Procédé de traitement de fibres textiles recyclées et système de processus de traitement de fibres textiles recyclées

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