EP4392608A1 - Verfahren zur herstellung eines zellstoffs - Google Patents

Verfahren zur herstellung eines zellstoffs

Info

Publication number
EP4392608A1
EP4392608A1 EP22802211.7A EP22802211A EP4392608A1 EP 4392608 A1 EP4392608 A1 EP 4392608A1 EP 22802211 A EP22802211 A EP 22802211A EP 4392608 A1 EP4392608 A1 EP 4392608A1
Authority
EP
European Patent Office
Prior art keywords
cellulose
fibers
solid phase
alkaline
cellulose fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22802211.7A
Other languages
English (en)
French (fr)
Inventor
Sébastien FRANCOIS
Marjorie SAISON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Induo SAS
Original Assignee
Induo SAS
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 Induo SAS filed Critical Induo SAS
Publication of EP4392608A1 publication Critical patent/EP4392608A1/de
Pending legal-status Critical Current

Links

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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres

Definitions

  • the method may further comprise a step S0 of unsmoothing the textile waste prior to or simultaneous with step S1.
  • the method may further comprise a spinning step S6, the spinning step being carried out by wet dry-jet spinning.
  • cellulose fibers come mainly from the cotton used in the manufacture of textiles. They can come from other materials, such as viscose or lyocell.
  • Textile waste can include cellulose fibers, polyester fibers and other types of synthetic fibers. Textile waste can also include non-fibrous parts (buttons, fasteners, decorative elements, for example).
  • Polyester is a family of polymers whose chain repeating units contain the ester function (-C(O)-O-). It is usually mixed with cellulose fibers to improve the quality of the textile. Indeed, textiles based on cellulose fibers and polyester fibers have the advantages of both types of fibers while reducing their respective disadvantages.
  • the most commonly used examples of polyesters are semi-aromatic copolyesters such as poly(ethylene terephthalate) (PET), copolymers of terephthalic acid and ethylene glycol.
  • PET poly(ethylene terephthalate)
  • a person skilled in the art will be able to determine which polymers belong to the family of polyesters.
  • the process for preparing cellulose pulp may further comprise a step S0 of unsmoothing textile waste prior to or simultaneous with step S1.
  • the unsmoothing step consists in particular in removing the seams and other accessories, for example buttons or zippers, from the textile waste.
  • This step has the advantage of removing non-filamentary components from the textile waste.
  • This smoothing step can be carried out by hand or automatically using a smoothing device.
  • the unsmoothing step S0 is carried out by means of a frayer, such as a machine of the Laroche Cadette or Laroche ExeL type.
  • the grinding step S1 comprises the grinding of the textile waste in order to obtain a first mixture of fibers and ground residues.
  • the grinding step S1 notably allows the textile waste to be ground into powder and/or filaments. It appears that the prior grinding of textile waste ultimately improves the quality of the cellulose pulp.
  • a first mixture of fibers and crushed residues is recovered, in the form of powder and/or filaments.
  • Step S1 can be carried out by means of a grinding device such as a knife grinding device or a grinding device with balls.
  • step S2 is carried out by dissolving a portion of the non-cellulosic components of the first mixture.
  • the aqueous alkaline solution may be an aqueous alkaline solution based on sodium hydroxide.
  • the mass proportion of sodium hydroxide can be comprised between 5 and 15%, preferably between 6 and 10%, more particularly being, in certain cases, 8% or, in certain other cases, 10%.
  • phase transfer catalyst makes it possible to accelerate the reaction.
  • it makes it possible to accelerate the chemical reactions transforming a chemical species from a starting phase to another phase, for example from a solid phase to a liquid phase.
  • the main phase transfer catalysts are phosphonium or quaternary ammonium salts.
  • the addition of a phase transfer catalyst improves yields but also reduces the degradation of cotton by the base contained in the alkaline aqueous solution.
  • the decolorization step makes it possible to decolorize the textile waste, that is to say to remove or deactivate the non-filamentous components making it possible to color the textiles, such as the coloring pigments.
  • the bleaching step thus makes it possible to adjust the whiteness of the fibers of the first mixture or of the second mixture by shrinkage or degradation of the dyes.
  • Step S2' can be carried out by means of discoloration by oxidation, discoloration by reduction, by acid or base treatment or by enzymatic discoloration, preferably discoloration by oxidation, by reduction or by acid or base treatment.
  • Step S3 can be carried out by means of a filter comprising pores smaller than the fineness of grinding carried out in step S1 or S1'.
  • the solid phase comprising the cellulose fibers obtained at the end of step S3 comprises a mass proportion of material other than the cellulose fibers of less than 8%, preferably less than 5%, more particularly less than 2%.
  • These materials other than cellulose fibers can in particular be polyamide, elastane, wool or even silk. These materials are not dissolved in step S2 and therefore remain in the solid phase. Thus, the mass proportion of materials other than cellulose fibers is very low, thus making it possible to prepare a better quality cellulose pulp with few impurities.
  • the solid phase comprising the cellulose fibers can also be washed, for example with an aqueous solution of acetic acid. It can then be filtered and washed, for example with distilled water. It can then be filtered and then dried.
  • the dissolution step S4 comprises the dissolution of the cellulose fibers of the solid phase to obtain a cellulose pulp comprising undissolved particles.
  • the dissolution step S4 makes it possible to dissolve the cellulose fibers in order to recover a cellulose paste.
  • Cellulose pulp includes undissolved particles, such as the impurities mentioned above that did not react during the dissolution step and dissolved particles. Undissolved impurities are small but still need to be removed from the cellulose pulp.
  • step S4 comprises:
  • step S4-13 for grinding the solid phase of alkaline cellulose fibers obtained at the end of step S4-12, in order to obtain a solid phase of less compact alkaline cellulose fibers, i.e. whose density is between 80 and 180 g/L, than the solid phase obtained at the end of step S4-12,
  • the mass of sodium hydroxide can be chosen such that the sodium hydroxide is in excess relative to the mass of the solid phase comprising the cellulose fibers, which ensures maximum swelling of the cellulose fibers.
  • the aqueous alkaline solution of step S4-11 can be an aqueous alkaline solution based on sodium hydroxide with a mass proportion of sodium hydroxide of between 15 and 25%.
  • step S4-15 the alkaline cellulose fibers are treated by bringing them into contact with carbon disulphide in order to form cellulose xanthate fibers.
  • the aqueous alkaline solution of step S4-16 is an alkaline aqueous solution based on sodium hydroxide with a mass proportion of sodium hydroxide of between 2 and 15%, in particular between 5 and 15%.
  • step S4-16 is carried out during a time interval of between 150 and 200 min at a temperature of between 0 and 10°C.
  • Dissolution step S4 according to the lyocell process.
  • step S4 comprises:
  • Step S4-21 disperses the cellulose fibers by bringing them into contact with an aqueous solution comprising NMMO in order to obtain a solution comprising water, NMMO and cellulose as well as the impurities , and facilitate the next reaction.
  • Figure 2 shows a ternary diagram whose axes respectively represent the mass proportion of water, the mass proportion of cellulose and the mass proportion of NMMO as well as the evolution of these proportions during the implementation of the process lyocell.
  • the hatched area represents the cellulose dissolution region in the NMMO.
  • Point a) represents the mixture comprising the cellulose fibers and water before dissolution. By decreasing the amount of water, the mixture moves towards point b) included in the region of dissolution in order to dissolve the cellulose.
  • the quantity of NMMO decreases until reaching the point c) where the NMMO has completely reacted with the cellulose.
  • the mixture at point c) thus comprises water and cellulose.
  • the evaporation step S4-22 makes it possible to evaporate the water in order to concentrate the cellulose until point d) is reached.
  • the paste has a different viscosity depending on the step S4 which is carried out. When it is obtained at the end of step S4-22, it has a much higher viscosity than at the end of step S4-17.
  • step S5 comprises the filtration of the cellulose pulp in order to obtain a cellulose pulp separated from the undissolved particles.
  • the viscosity can be measured according to the ISO 12058-1:2018 standard, using a steel ball with a diameter of 14 mm, a stopwatch, and standing at a temperature of 20°C.
  • Step S4-16 18q of an aqueous solution comprising 8% by mass of sodium hydroxide are introduced into the reactor.
  • the reactor is left to stand for 10 min.
  • the contents of the reactor are mixed for 3 h at 5° C. in order to dissolve the fibers of cellulose xanthate.
  • Example 2 preparation of a cellulose pulp with a dissolution step according to the lyocell process.
  • step S4 for dissolving the cellulose fibers.
  • Separation step S2 As in example 1.

Landscapes

  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Artificial Filaments (AREA)
  • Paper (AREA)
EP22802211.7A 2021-10-15 2022-10-12 Verfahren zur herstellung eines zellstoffs Pending EP4392608A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2110951A FR3128233B1 (fr) 2021-10-15 2021-10-15 Procédé de préparation d’une pâte de cellulose
PCT/FR2022/051918 WO2023062316A1 (fr) 2021-10-15 2022-10-12 Procédé de préparation d'une pâte de cellulose

Publications (1)

Publication Number Publication Date
EP4392608A1 true EP4392608A1 (de) 2024-07-03

Family

ID=78649464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22802211.7A Pending EP4392608A1 (de) 2021-10-15 2022-10-12 Verfahren zur herstellung eines zellstoffs

Country Status (4)

Country Link
EP (1) EP4392608A1 (de)
CN (1) CN118234906A (de)
FR (1) FR3128233B1 (de)
WO (1) WO2023062316A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3511140A1 (de) * 2018-01-15 2019-07-17 Lenzing Aktiengesellschaft Verfahren zum trennen einer faserförmigen zielkomponente von textilabfall
FI130401B (en) * 2020-03-09 2023-08-14 Infinited Fiber Company Oy Separation of polyester-cotton blends

Also Published As

Publication number Publication date
WO2023062316A1 (fr) 2023-04-20
FR3128233A1 (fr) 2023-04-21
FR3128233B1 (fr) 2023-10-13
CN118234906A (zh) 2024-06-21

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