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EP4291708B1 - Procédé pour une décomposition mécanique chimiquement assistée de copeaux de bois ou de copeaux de bois - Google Patents

Procédé pour une décomposition mécanique chimiquement assistée de copeaux de bois ou de copeaux de bois Download PDF

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Publication number
EP4291708B1
EP4291708B1 EP22702851.1A EP22702851A EP4291708B1 EP 4291708 B1 EP4291708 B1 EP 4291708B1 EP 22702851 A EP22702851 A EP 22702851A EP 4291708 B1 EP4291708 B1 EP 4291708B1
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EP
European Patent Office
Prior art keywords
wood chips
grinding
wood
temperature
feedstock
Prior art date
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Active
Application number
EP22702851.1A
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German (de)
English (en)
Other versions
EP4291708A1 (fr
EP4291708C0 (fr
Inventor
Juha FISKARI
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.)
Mondi AG
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Mondi AG
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Publication of EP4291708C0 publication Critical patent/EP4291708C0/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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/10—Physical methods for facilitating impregnation
    • 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
    • D21C3/00—Pulping cellulose-containing 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/20—Pulping cellulose-containing materials with organic solvents or in solvent environment
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping 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
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • 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
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means

Definitions

  • the present invention relates to a method for a chemically assisted mechanical pulping process of wood chips or wood chips and to a paper or cardboard produced thereby.
  • wood chips or wood chips are usually used in the industry.
  • the so-called kraft process is usually used for the chemical pulping of wood chips.
  • wood chips or wood chips can be pulped using a so-called semi-chemical pulping process, which involves a two-stage process.
  • thermomechanical digestion In addition to these two processes for digesting wood chips or wood chips, a hybrid of the two known processes, so-called thermomechanical digestion, is also used, which on the one hand is characterized by very high energy consumption and on the other hand leads to a wood pulp that is particularly suitable for subsequent paper and cardboard production.
  • the strong eutectic solvents used in this document are, for example, in the WO 2013/153203 A1 and consist of a salt in its liquid state, which consists of a mixture of a proton donor and a proton acceptor, which mixture forms a eutectic with a low melting point, which melting point is significantly lower than that of the individual components.
  • the document also contains various examples of strongly eutectic solvents and that these can be used in conjunction with lignocellulosic starting materials, in particular to dissolve the lignin contained in these materials.
  • pulp suspensions are usually subjected to grinding in order to reduce non-pulped or only partially pulped wood particles to such an extent that they do not lead to any inhomogeneities in the product made from the pulp.
  • a disadvantage of grinding is that in addition to the grinding of non-pulped wood particles, a not insignificant part of the fibers of the feedstock are also ground and thus shortened so that a final product after grinding has a fiber length distribution corresponding to a Gaussian curve that is shifted towards shorter fibers in relation to the fiber length of the wood material used.
  • the presence of longer fibers in the lignocellulosic material has the advantage that a better lattice network can be formed in the paper web and as a result, for example, papers with increased stretchability according to ISO 1924-3 can be obtained.
  • the chemically softened wood chips or chemically softened wood shavings are then mechanically ground, if necessary after a washing and cleaning step, it is surprisingly possible to obtain a fiber material that, compared to the fiber quality of a reference fiber material or the starting material, has significantly longer fibers and a lower proportion of fines after the grinding step, which is due to more complete and less damaged fibers.
  • a wood pulp which has longer and less damaged fibers and thus a significantly improved fiber quality compared to the state of the art, is particularly suitable for use in the paper and cardboard industry due to its homogeneous properties.
  • a further advantage of such a process is that the strongly eutectic solvent is kept at the lowest possible temperature, thus optimizing the energy balance on the one hand and preventing any adverse effects on the system, in particular its tendency to corrosion or deterioration, as far as possible.
  • the eutectic solvent used is non-corrosive, unlike the strong bases and acids that are usually used, so corrosion of the plant components can be prevented, thus avoiding the use of stainless steel for plant construction. This also prevents undesirable discoloration of the paper or cardboard web caused by corroded plant components.
  • the method is carried out in such a way that the grinding in step d) is carried out at a temperature between 100 and 160 °C, in particular at a temperature that increases from 115 °C to about 150 °C during the grinding process, by gradually increasing the temperature during the grinding in step d). Additionally or alternatively, according to a further development, the method is carried out in such a way that the pressure in the grinding step is gradually increased from values of 1.0 to 2.5 or 3.0 or 3.5 bar.
  • the process is carried out in such a way that a choline salt or a proline salt is used as the quaternary ammonium salt.
  • a strongly eutectic solvent can be provided which shows a particularly strong melting point depression and thus allows the process to be carried out at low temperatures and with relatively low energy consumption.
  • the choline salt used is a choline chloride or choline bromide or the proline salt is a proline chloride, it can be ensured that no foreign ions are introduced into the digestion system and thus a possibly complicated separation process after digestion with the strongly eutectic solvent can be avoided.
  • an amide is used as a co-solvent, in particular an amide selected from the group consisting of urea, formamide and acetamide, which amides are on the one hand strongly basic and thus significantly facilitate the digestion process and on the other hand also contribute to a significant reduction in the melting point of the ammonium salt and thus to a strong or deep eutectic.
  • urea is particularly preferred for ecological reasons, since waste products containing urea can be disposed of or even used, for example, as fertilizer for forests or the like.
  • wood chips or wood chips produced according to the method of the invention as well as auxiliary and additive materials selected from the group of wet strength agents, flocculation aids, sizing agents, retention aids and bleaching agents for the production of paper or cardboard, it is possible to produce a paper or cardboard that has particularly homogeneous fibers and thus consistent properties over the entire length or width of the paper produced.
  • the fiber length is significantly longer compared to conventionally produced papers and the papers also have significantly reduced air permeability, they can therefore be used without special or additional surface treatment, particularly in cases where a particularly dense material is desired.
  • wood chips or wood chips were used that were made from Norway spruce (Picea abies) using a reduction device, for example a chipper.
  • a first process step the wood chips were subjected to steaming, which steaming was carried out for a period of 10 minutes at a pressure of at least 1.0 bar, in particular a pressure between 1.0 and 1.5 bar and a steam temperature of over 100 °C, advantageously about 110 °C.
  • the purpose of steaming is to remove air from the wood chips or wood chips as well as to raise the temperature of the wood chips and stabilize it at the selected level.
  • the wood chips were soaked in a strongly eutectic solvent.
  • the steamed wood chips were soaked in the strong eutectic solution consisting of choline chloride and urea as well as that consisting of choline chloride and glycerin at 50 °C and 70 °C.
  • the soaking was carried out in a strong eutectic solution consisting of choline chloride and glycerin at 70 °C. Soaking in the strong eutectic solvent was carried out for 10 minutes in each case.
  • the material was rinsed with warm water (about 40 °C).
  • the wood chips or wood chips obtained in this way were fed to a grinding device or refiner and subjected to a grinding process as follows.
  • water was injected in order to adjust the wood pulp to a mass content of 25%.
  • Grinding was then started and the temperature was gradually raised from an initial temperature of 100 °C to 150 °C and the pressure in the grinding chamber was raised in the same way from 1 bar to at least 3.0 bar, in particular 3.5 bar. Grinding was continued until the specific energy consumption reached 2,000 kWh/t.
  • DES 1 denotes the strongly eutectic solution 1 consisting of choline chloride and urea
  • DES 2 the strongly eutectic solution consisting of choline chloride and glycerin
  • Ref. 1 comparative example 1 and Ref. 2 comparative example 2 The strongly eutectic solution 1, DES 1, was used at two different temperatures, namely 50 °C and 70 °C in process step c).
  • Table 1 Fiber quality as results of all pulp samples after milling Ref. 1 DES 1, 50 °C DES 1, 70 °C Ref.
  • Table 2 shows that all pulp samples treated with the strong eutectic solvents contained essentially the same amounts of lignin and hemicellulose as comparative examples 1 and 2. Carbohydrate analysis showed that treatment with DES 1 resulted in a low dissolution of the hemicelluloses, with the most important hemicellulose monomers, such as mannose and xylose, showing no significant differences compared to the comparative examples. Only the galacturonic acid content was greatly reduced compared to the comparative examples when treated with the strong eutectic solvent DES 1.
  • a wood pulp can be obtained which, in comparison to conventionally processed chips, has a significantly longer fiber length and a significantly increased water retention, although the lignin content in the wood pulp has remained essentially unchanged.
  • a wood pulp with a significantly improved fiber quality, in particular significantly elongated fibers was obtained with significantly reduced energy consumption in the milling step - only about half the energy of a milling step in a conventional process was used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Claims (5)

  1. Procédé de désintégration mécanique supportée chimiquement de plaquettes forestières comprenant les étapes suivantes :
    a) fabrication d'un matériau de charge composé de plaquettes forestières ;
    b) contact du matériau de charge composé de plaquettes forestières avec de la vapeur sous une première pression entre 1 et 2 bar, à une température de vapeur entre 100 et 110 °C pour une période entre 10 et 20 minutes, pour fabriquer un matériau de charge en plaquettes forestières vaporisé ;
    c) mise en contact du matériau de charge en plaquettes forestières vaporisé avec une solution contenant un solvant fortement eutectique, comprenant un sel d'ammonium quaternaire, choisi parmi un sel de choline ou un sel de proline et un cosolvant à une température entre 40 et 120 °C, de préférence 50 à 100 °C et pendant une durée entre 5 et 15 minutes, de préférence 5 à 10 minutes, dans lequel un matériau de charge en plaquettes forestières prétraité est obtenu, dans lequel une concentration du solvant fortement eutectique est choisie supérieure à 92 % en masse, de préférence supérieure à 95 % en masse et une quantité restante du solvant est sensiblement composée d'eau, et dans laquelle un rapport molaire du sel d'ammonium quaternaire sur un amide en tant que cosolvant est choisi entre 1:1 et 1:2 ; et
    d) broyage mécanique du matériau de charge en plaquettes forestières prétraité sous une pression entre 1 et 3,5 bar et à une température de plus de 100 °C.
  2. Procédé selon la revendication 1, caractérisé en ce que le broyage à l'étape d) est réalisé à une température entre 100 et 160 °C, en particulier pendant un déroulement du broyage à une température en augmentation entre 115 et 150 °C.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le broyage à l'étape d) est réalisée à un gradient de pression entre 1,0 à 3,5 bar, en particulier entre 2,5 et 3,0 bar.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que le sel d'ammonium quaternaire est choisi parmi le groupe composé de chlorure de choline, bromure de choline ou chlorure de proline.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'amide est choisi parmi le groupe composé de la carbamide, la formamide et l'acétamide.
EP22702851.1A 2021-02-12 2022-01-31 Procédé pour une décomposition mécanique chimiquement assistée de copeaux de bois ou de copeaux de bois Active EP4291708B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50089/2021A AT524693B1 (de) 2021-02-12 2021-02-12 Verfahren für ein chemisch unterstütztes mechanisches Aufschlussverfahren von Hackschnitzeln bzw. Hackspänen
PCT/AT2022/060028 WO2022170373A1 (fr) 2021-02-12 2022-01-31 Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois

Publications (3)

Publication Number Publication Date
EP4291708A1 EP4291708A1 (fr) 2023-12-20
EP4291708B1 true EP4291708B1 (fr) 2024-12-18
EP4291708C0 EP4291708C0 (fr) 2024-12-18

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EP22702851.1A Active EP4291708B1 (fr) 2021-02-12 2022-01-31 Procédé pour une décomposition mécanique chimiquement assistée de copeaux de bois ou de copeaux de bois

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EP (1) EP4291708B1 (fr)
AT (1) AT524693B1 (fr)
WO (1) WO2022170373A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT527339A1 (de) * 2023-07-11 2025-01-15 Mondi Ag Verfahren zur Herstellung von Papier aus Abfallholz sowie daraus hergestelltes Papier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013153203A1 (fr) 2012-04-12 2013-10-17 Technische Universiteit Eindhoven Prétraitement de biomasse lignocellulosique et récupération de substituants au moyen de mélanges naturels de solvants eutectiques profonds (des)/composés présentant des températures de transition basses
EP2876202A1 (fr) 2013-11-25 2015-05-27 CEPI aisbl Utilisation de solvants eutectiques profonds dans la production de papier
FI127062B (en) * 2014-11-18 2017-10-31 Upm Kymmene Corp Method and apparatus for making pulp
WO2017032926A2 (fr) * 2015-08-27 2017-03-02 Teknologian Tutkimuskeskus Vtt Oy Procédé de conversion de biomasse
FI129866B (fi) * 2019-05-15 2022-10-14 Lappeenrannan Lahden Teknillinen Yliopisto Lut Menetelmä lignoselluloosamateriaalin fraktioimiseksi ja mainitulla menetelmällä saadut tuotteet
AU2020100319A4 (en) * 2020-03-04 2020-05-14 Qilu University Of Technology Method for preparing cellulose nanofibrils by deep eutectic solvent pretreatment
CN112431055A (zh) * 2020-11-16 2021-03-02 陕西科技大学 一种由造纸用化学浆制备溶解浆的新工艺

Also Published As

Publication number Publication date
EP4291708A1 (fr) 2023-12-20
WO2022170373A1 (fr) 2022-08-18
AT524693B1 (de) 2022-11-15
AT524693A1 (de) 2022-08-15
EP4291708C0 (fr) 2024-12-18

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