WO2024107090A1 - Procédé de blanchissement de pâte de cellulose formée par un matériau textile recyclé - Google Patents

Procédé de blanchissement de pâte de cellulose formée par un matériau textile recyclé Download PDF

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Publication number
WO2024107090A1
WO2024107090A1 PCT/SE2023/051030 SE2023051030W WO2024107090A1 WO 2024107090 A1 WO2024107090 A1 WO 2024107090A1 SE 2023051030 W SE2023051030 W SE 2023051030W WO 2024107090 A1 WO2024107090 A1 WO 2024107090A1
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WO
WIPO (PCT)
Prior art keywords
bleaching
pulp
acidifying
stage
arrangement
Prior art date
Application number
PCT/SE2023/051030
Other languages
English (en)
Inventor
Maria VENNERSTRÖM
Ann-Sofi NÄSHOLM
Sofia BYLUND
Original Assignee
Valmet 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 Valmet Ab filed Critical Valmet Ab
Publication of WO2024107090A1 publication Critical patent/WO2024107090A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B16/00—Regeneration of cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H8/00—Macromolecular compounds derived from lignocellulosic materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1047—Conserving the bleached pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G11/00—Disintegrating fibre-containing articles to obtain fibres for re-use
    • 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
    • Y02W30/66—Disintegrating fibre-containing textile articles to obtain fibres for re-use

Definitions

  • the invention relates to a method for bleaching pulp formed from recycled textile material comprising cellulose.
  • the invention also relates to a method for producing bleached cellulose pulp from recycled textile material and a corresponding system.
  • SE544236C2 proposes two-stage ozone bleaching of pulp formed from recycled textile material.
  • Dissolving pulp has a high alpha cellulose content, typically over 90 %.
  • Dissolving pulp is used for example to produce textiles using the viscose or lyocell processes. Such processes typically require low levels of metal ions in the cellulose pulp.
  • Fe is typically required to be 10 ppm or less.
  • Fe, Co and Mn may catalyze oxidative polymerization (ageing), and Ca and SiO2 may be problematic in filtering and spinning.
  • Fe and Cu may reduce the stability of the NMMO compound used as solvent.
  • the above-mentioned known methods for bleaching pulp formed from recycled textile material may provide cellulose pulp of sufficiently high brightness to meet the requirements of dissolving pulp, but the metal ion content may be too high to be used in for example viscose or lyocell processes.
  • an improved method for bleaching cellulose pulp which not only provides high brightness, but also low metal ion content.
  • An object of the invention is to provide a method which solves or at least improves on the problems identified in the above background section.
  • a method for bleaching pulp formed from recycled textile material comprising cellulose comprises subjecting the pulp to at least one bleaching stage, and after a final bleaching stage of said at least one bleaching stage, washing and acidifying the pulp.
  • the method comprises bleaching the pulp in one or more (subsequent) bleaching stages, where the final bleaching stage comprises or is followed by washing and acidifying the pulp, for instance as a washing stage followed by an acidifying stage in which acidifying chemical(s) is/are added.
  • Acidifying chemical(s) may also be added in the washing stage, i.e. the acidifying may be carried out by means of (i) adding acidifying chemical(s) to the washing, and (ii) as an acidifying stage after the washing (in which acidifying chemical(s) is/are also added).
  • the method may further comprise, after the acidifying, washing the pulp.
  • the method is a method for bleaching pulp (previously) formed from recycled textile material comprising cellulose i.e. the forming of the pulp (pulping) is not necessarily part of the method according to the first aspect of the invention. Put differently, the method comprises providing pulp formed from recycled textile material comprising cellulose.
  • the invention is based on the insight that the difficulties achieving sufficiently low levels of metal ions is related to that the non-standardized raw material (recycled textile material) - the quality of the textile material and the dyes used for production thereof varies greatly, and consequently so does the metal ion content.
  • the inventors have further realized that recycled textile material may comprise buttons, zippers and other metallic parts which increase the metal content considerably.
  • the invention is further based on the insight that by adding an acidifying stage after the bleaching, a low metal ion content can be achieved, even when the raw material varies in the above-described manner.
  • the acidifying comprises adding at least one acidifying chemical at a charge such that the pH is reduced to within a range from 1.0 to 4.0, such as 1.5 to 4.0, such as 2.0 to 3.0. It is understood that the acidifying chemical may be added in any form (as a solution, in gas phase etc.).
  • the at least one acidifying chemical may comprise one or more of sulfuric acid (H2SO4), sulfur dioxide (SO2), sodium bisulfite (NaHSCh) and/or hydrochloric acid (HCI).
  • the acidifying may comprise adding acidifying chemicals in the form of 50 weight % HCI and 50 weight % H2SO4
  • the acidifying stage may be carried out at a temperature within a range from 20 to 80 degrees C.
  • the acidifying stage may be carried out at for a duration of 2 to 60 minutes, such as 5 to 15 minutes.
  • the acidifying stage may be carried out at pulp consistency of 2 to 14 weight % such as 5-12 weight %.
  • the acidifying stage may be carried out as part of a dilution stage comprising adding at least one chemical and dilution liquid to the pulp.
  • the dilution stage may comprise conveying the pulp through a storage tower, a standpipe, a dilution screw and/or shredding screw and adding acidifying chemical(s) thereto.
  • the final bleaching stage may comprise hydrogen peroxide bleaching (or is a hydrogen peroxide bleaching stage), wherein the method further comprises, prior to or during the hydrogen peroxide bleaching, adding magnesium sulfate.
  • the magnesium sulfate acts as a radical scavenger to reduce a loss of viscosity due to the hydrogen peroxide bleaching.
  • the acidifying may, as described above, be carried out in two stages (by (i) adding acidifying chemical(s) to the washing, and (ii) as an acidifying stage after the washing in which acidifying chemical(s) is/are also added).
  • the pulp may be provided to the bleaching stage(s) at high consistency (HC), for example at a consistency (by weight) of at least 30 %, preferably within a range from 35-42 %.
  • the pulp may be provided at medium consistency (MC), for example at a consistency (by weight) of 8-16 %, preferably 10-12 %.
  • the pulp may be provided to both bleaching stages at high consistency (HC), for example at a consistency (by weight) of at least 30 %, preferably within a range from 35-42 %.
  • high consistency to the second bleaching stage may be achieved by providing pulp at high consistency to the first bleaching stage followed by the washing stage and an optional dewatering stage before the second bleaching stage.
  • the pulp may be provided to the second bleaching stage at medium consistency (MC), for example at a consistency (by weight) of 8-16 %, preferably 10-12 %.
  • Such medium consistency to the second bleaching stage may be achieved by providing pulp at high consistency to the first bleaching stage followed by the washing and an optional diluting stage (or pretreating stage which comprises dilution) before the second bleaching stage.
  • the pulp may be provided to the first bleaching stage at medium consistency (MC), for example at a consistency (by weight) of 8-16 %, preferably 10-12 %.
  • the pulp may be provided to the second bleaching stage also at medium consistency (MC), for example at a consistency (by weight) of 8-16 %, preferably 10-12 %.
  • the pulp may be provided to the second bleaching stage at high consistency (HC), for example at a consistency (by weight) of at least 30 %, preferably within a range from 35-42 %.
  • high consistency to the second bleaching stage may be achieved by providing pulp at medium consistency to the first bleaching stage followed by the washing and a dewatering stage before the second bleaching stage.
  • one or more (or each) of the at least one bleaching stage comprises ozone bleaching.
  • at least the first bleaching stage comprises ozone bleaching.
  • Ozone may be added as a gas mixture, for example with 8-14 % ozone by weight in an ozone-air mixture.
  • the ozone bleaching of a HC pulp may be performed for a duration of 10 seconds - 5 minutes, such as 30-60 seconds, for example at a temperature of 40-70 °C.
  • one or more of the at least one bleaching stage comprises ozone bleaching followed by chlorine dioxide bleaching.
  • the bleaching stage may be a ZD-stage.
  • the chlorine dioxide bleaching may follow directly after the ozone bleaching, i.e. without intermediate washing, and may thus be referred to as a (ZD) stage.
  • ZD ZD stage.
  • This may be advantageous since a combination of chlorine dioxide and ozone results in a synergistic effect regarding brightness level. Therefore, an addition of chlorine dioxide directly after the ozone stage without intermediate washing will reinforce the bleaching effect.
  • advantageous effects in terms of viscosity control may be achieved since ozone impacts viscosity while chlorine dioxide does not.
  • the chlorine dioxide charge may, if only one bleaching stage comprises chlorine dioxide bleaching, correspond to 30 kg active chlorine /odt or less. If two bleaching stages comprise chlorine dioxide bleaching, the total chlorine dioxide charge may correspond to 40 kg active chlorine /odt or less.
  • the ZD-stage may be followed by a hydrogen peroxide bleaching stage, preferably with a washing stage between the i.e. chlorine dioxide bleaching and the hydrogen peroxide bleaching, i.e. such that the overall bleaching sequence is ZDP or (ZD)P.
  • one or more of the at least one bleaching stage comprises ozone bleaching followed by hydrogen peroxide bleaching.
  • the first and/or second bleaching stage may be a ZP-stage.
  • the hydrogen peroxide bleaching may follow directly after the ozone bleaching, i.e. without intermediate washing, and may thus be referred to as a (ZP) stage.
  • Hydrogen peroxide is a secondary reactions product in ozone bleaching, therefore an addition of hydrogen peroxide directly after the ozone stage without intermediate washing will reinforce the ozone bleaching stage.
  • the total hydrogen peroxide charge of the bleaching stage(s) may be less than 40 kg hydrogen peroxide /odt.
  • a first bleaching stage is a (ZD)-stage and a second bleaching stage is a (ZP)-stage.
  • one or more of the at least one bleaching stage comprises ozone bleaching and adding one or more additives, the additives comprising at least one chelating agent and/or at least one radical scavenger.
  • the bleaching stage may be referred to as a Zq-stage.
  • the one or more additives may be added directly after the ozone bleaching, i.e. without any intermediate washing or other step (a (Zq)-stage).
  • the bleaching stage may comprise a dilution step (using a dilution screw for example) directly after the ozone bleaching step in which dilution liquid and the at least one chelating agent and/or at least one radical scavenger is added.
  • the one or more additives may alternatively be added before the ozone bleaching.
  • Chelating agents which may also be referred to as complexing agents, provide the effect that selectivity in the ozone bleaching step is improved by reducing the content of metal ions in the pulp, which metal ions catalyze the degradation of ozone to free radicals, which in turn cause cellulose degradation.
  • Radical scavengers have a similar effect by scavenging the metal ions.
  • the one or more additives may be chosen from a group comprising oxalic acid, acetic acid, ethylenediaminetetraacetic acid, EDTA, diethylenetriaminepentaacetic acid, DTPA, magnesium sulfate or calcium chloride.
  • the additives may be added at charge of 1-20 kg/odt, or more specifically if the additive is EDTA or DTPA at charge of 1-2 kg/odt.
  • the embodiments described above may be combined, such that for example a first bleaching stage is a (Zq)- stage while a second bleaching stage is a (ZD) or (ZP) stage.
  • one or more of the at least one bleaching stage comprising ozone bleaching comprises alkaline extraction after the ozone bleaching.
  • the bleaching stage may be a Ze-stage.
  • a method for producing bleached cellulose pulp from recycled textile material comprising cellulose.
  • the method comprises pulping the recycled textile material to form cellulose pulp, for instance by swelling the material under reducing conditions as described in WO2018/073177A1.
  • the method further comprises bleaching the formed cellulose pulp using the method according to the first aspect of the invention, or embodiments thereof.
  • a method for producing fibers for textile production from recycled textile material comprising cellulose comprising producing bleached cellulose pulp using the method according to the second aspect of the invention or embodiments thereof and subjecting the bleached cellulose pulp to a viscose or lyocell process to produce said fibers.
  • the viscose and lyocell processes are known in the art and will not be described in further detail here.
  • a system for producing bleached cellulose pulp from recycled textile material comprising cellulose
  • the system comprising a pulping arrangement arranged to receive the recycled textile material to produce pulp therefrom, at least one bleaching arrangement arranged to bleach pulp obtained from the pulping arrangement, a washing arrangement arranged to wash bleached pulp from a final bleaching arrangement of the at least one bleaching arrangement, and an acidifying arrangement arranged to acidify the washed pulp.
  • a final bleaching arrangement of said at least one bleaching arrangement is configured for hydrogen peroxide bleaching, i.e. a bleaching arrangement configured to bleach the pulp by means of adding one or more bleaching chemicals comprising hydrogen peroxide, or solely hydrogen peroxide.
  • Such embodiments may further comprise means (such as one or more nozzles) for adding magnesium sulfate to, or prior to, the final bleaching arrangement.
  • system further comprises means (such as one or more nozzles) for adding at least one acidifying chemical to said washing arrangement.
  • the acidifying arrangement is formed as a dilution arrangement and means for adding at least one acidifying chemical into said dilution arrangement. It is understood that the dilution arrangement also comprises means for adding at least one dilution liquid, which may comprise filtrate from one or more washing arrangements of the system. The dilution liquid and the at least one acidifying chemical may be mixed and added together to the dilution arrangement.
  • the dilution arrangement may comprise a storage tower, a standpipe, a dilution screw, a shredder screw or combinations thereof.
  • fig. 1 shows a flowchart illustrating an embodiment of the method according to the first aspect of the invention
  • fig. 2 schematically illustrates an embodiment of the method according to the third aspect of the invention, and consequently also illustrates embodiments of methods according to the first and second aspects of the invention.
  • Fig. 1 shows a flowchart illustrating an embodiment of the method according to the second aspect of the invention.
  • the method comprises bleaching 2 pulp formed from recycled textile material.
  • the pulp is advantageously provided in washed form or is washed prior to bleaching.
  • the bleaching comprises ozone bleaching, i.e. bleaching by means of adding ozone to the pulp.
  • the pulp may optionally be dewatered/thickened (not shown) prior to the bleaching 2 such that the pulp is provided to the bleaching at high consistency (at least 30 %, preferably within a range from 35-42 %).
  • the pulp is washed 3 to remove dissolved material from the bleaching, whereafter it is acidified 4 by means of adding acidifying chemicals in the form of 50 % HCI and 50 % H2SO4 at a charge such that the pH is reduced to within a range from 1.5 to 4.0.
  • the dilution/acidifying is carried out at a temperature within a range from 20 to 80 degrees C.
  • the pulp is cooled prior to the acidifying 4 to achieve a temperature in said range.
  • the acidifying may be carried out for a duration of 5 to 15 minutes, and at a pulp consistency of 5-12 weight %.
  • the pulp is optionally diluted prior to or as part of the acidifying 4.
  • Steps 3-5 of fig. 1 and 2 also illustrate an embodiment of the method according to the first aspect of the invention.
  • Fig. 2 schematically illustrates another embodiment of the method according to the third aspect of the invention.
  • the method comprises pulping 11 the recycled textile material to form cellulose pulp, for instance by swelling the material under reducing conditions as described in WO2018/073177A1.
  • the pulp is washed after pulping.
  • the method further comprises bleaching in two stages 12a, 12c with an intermediate washing stage 12b.
  • first bleaching stage 12a the pulp is subjected to ozone bleaching followed directly by chlorine dioxide bleaching (a (ZD)-stage).
  • second (final) bleaching stage 12c the pulp is subjected to hydrogen peroxide bleaching.
  • magnesium sulfate is added to the hydrogen peroxide bleaching stage 12c.lt is noted that fig. 2 is only a schematic illustration - in practice, the magnesium sulfate is usually added prior to the bleaching stage 12c, for instance in a (not shown) dilution screw.
  • the bleached pulp is thereafter washed 13 and then subjected to a dilution/acidification stage 14 in which recirculated filtrate from the subsequent washing 15 and acidifying chemicals are added.
  • dilution liquid from another source is added to the dilution stage 14.
  • the acidifying chemicals are added in the form of 50 % HCI and 50 % H2SO4 at a charge such that the pH is reduced to within a range from 1.5 to 4.0.
  • the dilution/acidification is carried out at a temperature within a range from 20 to 80 degrees C and for a duration of 5 to 15 minutes.
  • the pulp is cooled prior to the dilution/acidification stage 14 to achieve a temperature in said range.
  • the dilution/acidification stage comprises conveying the pulp through a storage tower, a standpipe, a dilution screw and/or shredding screw and adding the filtrate and acidifying chemical(s) thereto.
  • the shredding screw may be a shredding screw of a twin-roll press used in the washing stage 13, i.e. the washing stage and (part of the) dilution/acidification stage may both carried out using a single apparatus, where the pulp is diluted in the shredding screw.
  • filtrate and acidifying chemicals are added (dotted line) also to the washing stage 13. Consequently, the pulp is acidified during washing 13 and diluting 14.
  • Adding the acidifying chemicals to a shredding screw of a twin-roll press can alternatively be considered as a dilution stage after the washing.
  • washing liquid from another source are added to the washing stage 13. After the dilution/acidification stage 14, the pulp is washed 15 to remove metal ion content released from the pulp due to the acidifying.
  • the bleached pulp (of low metal ion content) is subjected to a viscose process 16.
  • a viscose process 16 Such processes are well known in the art and will not be shown in further detail here.
  • ozone is added as a gas mixture, for example with 8-16 % ozone by weight in an ozone-air mixture, preferably 10-12 % ozone by weight.
  • the ozone bleaching may be performed for a duration of 10-60 seconds at a temperature of 40-70 °C.
  • the overall ozone charge of the bleaching amounts to less than 8 kg/odt, typically 5-6 kg/odt.
  • Stages 12a-15 of fig. 2 also illustrate an embodiment of the method according to the first aspect of the invention. Stages 11-15 of fig. 2 also illustrate an embodiment of the method according to the second aspect of the invention.
  • Fig. 2 could also be said to illustrate an embodiment of the system according to the fourth aspect of the invention, which embodiment comprises a pulping/washing arrangement 11 , bleaching apparatuses 12a, 12c, washing apparatuses 12b, 13, 15 and a dilution arrangement 14 in the form of a storage tower, a standpipe and/or a dilution screw, and nozzles for adding acidifying chemicals and magnesium sulfate.
  • a pulping/washing arrangement 11 bleaching apparatuses 12a, 12c, washing apparatuses 12b, 13, 15
  • a dilution arrangement 14 in the form of a storage tower, a standpipe and/or a dilution screw, and nozzles for adding acidifying chemicals and magnesium sulfate.
  • Such arrangements, apparatuses and nozzles are all well-known in the art and will not be described in further detail here.
  • one or more bleaching stages may be added prior to or after the first and second bleaching stages 12a, 12c, or part(s) of the first and second bleaching stages (for example the chlorine dioxide bleaching in stage 12a and/or the magnesium sulfate addition in stage 12c) may be omitted.

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  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

La présente invention concerne un procédé de blanchiment de pâte formée d'un matériau textile recyclé contenant de la cellulose. Le procédé comprend la soumission de la pâte à au moins une phase de blanchissement (2), après une phase finale de blanchissement de ladite ou desdites phases de blanchissement, le lavage (3) de la pâte, et après ledit lavage, l'acidification (4) de la pâte.
PCT/SE2023/051030 2022-11-15 2023-10-18 Procédé de blanchissement de pâte de cellulose formée par un matériau textile recyclé WO2024107090A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2230370A SE2230370A1 (en) 2022-11-15 2022-11-15 Method for bleaching cellulose pulp formed from recycled textile material
SE2230370-5 2022-11-15

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WO2024107090A1 true WO2024107090A1 (fr) 2024-05-23

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006772A1 (fr) * 1993-09-02 1995-03-09 Union Camp Patent Holding, Inc. Procede ameliore de blanchiment de pate lignocellulosique
WO2001016423A1 (fr) * 1999-08-30 2001-03-08 North Carolina State University Procede de preparation de pate pour tiges de mais et autres materiaux fibreux non ligneux
WO2015077807A1 (fr) * 2013-11-26 2015-06-04 Lenzing Ag Procédé pour prétraiter des fibres de coton récupérées destinées à être utilisées dans la production de corps moulés à partir de cellulose régénérée
US20150337496A1 (en) * 2014-05-20 2015-11-26 Georgia-Pacific Consumer Products Lp Bleaching and shive reduction process for non-wood fibers
WO2018073177A1 (fr) 2016-10-19 2018-04-26 Re:Newcell Ab Recyclage de textiles cellulosiques
EP3882380A1 (fr) * 2020-03-16 2021-09-22 Re:NewCell AB Procédé d'élimination de métal et de blanchiment en une étape ayant lieu en milieu acide
WO2022139651A1 (fr) * 2020-12-21 2022-06-30 Valmet Ab Procédé permettant de blanchir une pâte à partir d'un matériau textile recyclé

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT517020B1 (de) * 2015-02-06 2020-02-15 Chemiefaser Lenzing Ag Recycling von cellulosischen Kunstfasern
FI129105B (en) * 2017-04-27 2021-07-15 Teknologian Tutkimuskeskus Vtt Oy Treatment procedure for textile-based materials

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006772A1 (fr) * 1993-09-02 1995-03-09 Union Camp Patent Holding, Inc. Procede ameliore de blanchiment de pate lignocellulosique
WO2001016423A1 (fr) * 1999-08-30 2001-03-08 North Carolina State University Procede de preparation de pate pour tiges de mais et autres materiaux fibreux non ligneux
WO2015077807A1 (fr) * 2013-11-26 2015-06-04 Lenzing Ag Procédé pour prétraiter des fibres de coton récupérées destinées à être utilisées dans la production de corps moulés à partir de cellulose régénérée
US20150337496A1 (en) * 2014-05-20 2015-11-26 Georgia-Pacific Consumer Products Lp Bleaching and shive reduction process for non-wood fibers
WO2018073177A1 (fr) 2016-10-19 2018-04-26 Re:Newcell Ab Recyclage de textiles cellulosiques
EP3882380A1 (fr) * 2020-03-16 2021-09-22 Re:NewCell AB Procédé d'élimination de métal et de blanchiment en une étape ayant lieu en milieu acide
WO2022139651A1 (fr) * 2020-12-21 2022-06-30 Valmet Ab Procédé permettant de blanchir une pâte à partir d'un matériau textile recyclé

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