WO2008138428A1 - Procédé de défibrage de matière première lignocellulosique traitée chimiquement - Google Patents

Procédé de défibrage de matière première lignocellulosique traitée chimiquement Download PDF

Info

Publication number
WO2008138428A1
WO2008138428A1 PCT/EP2008/002573 EP2008002573W WO2008138428A1 WO 2008138428 A1 WO2008138428 A1 WO 2008138428A1 EP 2008002573 W EP2008002573 W EP 2008002573W WO 2008138428 A1 WO2008138428 A1 WO 2008138428A1
Authority
WO
WIPO (PCT)
Prior art keywords
raw material
chemical solution
lignin
lignocellulosic raw
sorting
Prior art date
Application number
PCT/EP2008/002573
Other languages
German (de)
English (en)
Inventor
Esa-Matti Aalto
Hans-Ludwig Schubert
Original Assignee
Voith Patent Gmbh
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 Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2008138428A1 publication Critical patent/WO2008138428A1/fr

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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • 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
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/06—Sulfite or bisulfite pulp
    • 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
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Definitions

  • the invention relates to a method for defibering chemically treated lignocellulosic raw material.
  • Fibers of lignocellulosic raw material are widely used, in particular for the production of cardboard and paper. They are unbleached, used for high-quality uses but above all bleached. In the production of pulp, an equilibrium is sought in which a maximum of fibers of predetermined quality is produced from the lignocellulosic raw material used with a minimum of yield loss.
  • the fiber quality is defined by various properties of the fiber produced, in particular the strength of the fiber, the bleachability of the fiber and / or fiber optic properties such. B. the specific volume of the fibers.
  • the aim of defibering is to produce single fibers and small fiber bundles, the z. B. can be used in paper production. Too large fiber bundles are sorted out in the sorting, which is downstream of the fiberization. Is sorted z. B. with slotted or perforated screens, which typically have a diameter of less than 0.5 mm, usually of 0.2 mm or less. Fibers and fiber bundles that pass through these screens are referred to as accepts and recorded as yield.
  • Fiber bundles which are retained here are referred to as rejects and undergo at least a second grinding or defibration in the prior art processes, since otherwise the yield of the known processes is not within an economic range.
  • fibers are known which are produced mechanically by grinding. They are produced in high yield of about 75% to 98% based on the raw material used otro, but have only a low strength potential of up to 3.5 km tear length, which can not be increased by further grinding of the fibers.
  • a specific grinding energy of up to 3,500 kWh / t based on otro pulp is required.
  • a specific grinding energy of 1,000 kWh / t can already be enough.
  • the lignocellulosic raw material is usually treated with chemicals prior to defibering.
  • the chemical treatment ranges from a simple impregnation via digestion processes, the yields of about 80% based on the otro raw material produce up to digestion, yielding yields of about 45% to 55% based on the otro raw material.
  • the strength potential of the fibers can be further developed by grinding, that is, by spending more energy.
  • the fiber structure of the raw material is only weakened or softened, but hardly dissolved.
  • the yield of these chemo-mechanical processes is 75% to 95% based on the otro raw material, the energy required for fiberization is at least 1,000 kWh / t of specific grinding energy. Only at the expense of this specific grinding energy is the raw material broken down into fiber bundles and, to a lesser extent, into individual fibers that pass through the sorting process. For these individual fibers and smaller fiber bundles z. B. possible further processing to paper.
  • One step further goes with the use of chemicals in the so-called semi-chemical pulps; the chemicals are allowed to act more intensely, at higher temperature and for a longer time on the lignocellulosic raw material.
  • the fiber structure is in turn weakened or softened and to some extent also dissolved.
  • the yield of these semi-chemical pulps after defibration between 65% and 90% based on the otro raw material.
  • the strengthening The level of the shredded substance is still low.
  • the pulping of the aforementioned raw materials takes place after digestion by mechanical aggregates, which generally produce the desired pulp in several stages.
  • the yield after the first defibration is between 50% and 95% of the digested raw material. This means that a maximum of 95% of the digested raw material is isolated so much that they pass the sorting. Only this pulp is so for further processing z. B. on paper suitable.
  • This object is achieved with a method for producing pulp from lignocellulosic raw material with the steps
  • Digesting the lignocellulosic raw material in the liquid phase and separating the free-flowing chemical solution and the lignocellulosic raw material characterized in that the digested lignocellulosic raw material is subjected to a first defibration, wherein in the decomposition of softwood up to 5% of the digested softwood after the first defibering not When sorting hardwood up to 3% of digested hardwood after the first pulping, not sorting happen, and when digesting annual plants up to 2% of the open-pollinated annual crops after the first pulping, the sorting does not happen.
  • the fibrous material produced according to the invention can be almost completely disassembled into individual fibers or small fiber aggregates during the first defibering, which pass through the sorting. A remainder of up to 5% of the digested lignocellulosic raw material, which does not pass the sorting at the first defibering, is negligible compared to the prior art.
  • the extensive and very uniform defibration is the result of the digestion, which is carried out by means of sulfite, and which leads to a yield of more than 75%, maximum 98%, based on the lignocellulosic raw material. Of these 75% to a maximum of 98% yield, at least 95% of the respective digested raw material are suitable for further processing.
  • the extraordinarily high yield at the first defibering of the lignocellulosic raw material has numerous economic advantages.
  • the investment costs - and also the operating costs - for the fiber sorting in the inventive method are lower than in the prior art. Since essentially a first defibration is sufficient, the overall process of fiber production is simplified. It will at best be one small reject preparation needed.
  • the total amount of energy required for defibration is considerably reduced compared to the prior art, since the raw material is largely decomposed by the first defibration.
  • only up to 4%, preferably up to 3%, preferably up to 2%, advantageously up to 1.5% of the digested softwood are retained in the sorting after the first defibering of softwood because they are for have another use too large dimensions.
  • After the first defibering of hardwood preferably only up to 2%, preferably up to 1.5% of the digested hardwood are retained in the sorting.
  • After the first defibering of annual plants preferably only up to 1% of the open-pollinated annual plants are retained in the sorting.
  • this fibrous material is characterized by an extraordinarily uniform digestion, in particular by a uniform sulfonation which homogeneously permeates the raw material.
  • the sulfonation of the lignocellulosic raw material apparently takes place predominantly in the region of the middle lamella, since the fibers are separated very uniformly.
  • rejects can be burned for energy, especially if they have a proportion of less than 3% of the digested lignocellulosic raw material. The rejects thus also contribute to the economic viability of the procedure.
  • the method according to claim 1 produces a very high quality pulp. It is a fibrous material with a content of at least 15% lignin, preferably at least 17% lignin, advantageously at least 19% lignin, more preferably at least 21% based on otro pulp for softwood or with a content of at least 14% lignin, preferably at least 16% lignin, more preferably at least 18% lignin based on otro pulp for hardwood.
  • it is a pulp with a content of at least 15% lignin based on otro pulp for softwood, which at a freeness of up to 15 0 SR a tearing length of more than 8 km, preferably more than 9 km, advantageously more than 10 km, or to a pulp containing at least 12% lignin based on otro pulp for hardwood, which at a freeness of up to 20 0 SR a tearing length of more than 5 km, preferably more than 6 km, particularly preferably more than 7 km.
  • the yield was determined by weighing the raw material used and the pulp obtained after the pulping, each at 105 0 C to constant weight
  • the paper technology properties were determined on test sheets which were produced according to Zellcheming leaflet V / 8/76. The freeness was measured according to Zellcheming leaflet V / 3/62. - The density was determined according to Zellcheming regulation V / 11/57.
  • the tear length was determined according to Zellcheming regulation V / 12/57.
  • the tear resistance was determined according to DIN 53 128 Elmendorf.
  • the determination of the Tensile, Tear and Burst Index was carried out according to TAPPI 220 sp-96.
  • the whiteness was determined by preparing the test sheets according to Zellcheming leaflet V / 19/63, measured according to SCAN C 11:75 with a Datacolor elrepho 450 x photometer; the whiteness is given in percent according to ISO standard 2470. All percentages in this document are by weight unless otherwise specified.
  • Spruce wood chips are after a damping (30 minutes with saturated steam at 105 0 C) with a sodium sulfite digestion solution at a liquor ratio of wood: digestion solution 1: 3 added.
  • the total use of chemicals was 23.6% calculated as sodium sulfite, based on otro spruce wood chips.
  • the impregnated with chemical solution spruce wood chips were heated over a period of 90 minutes at 170 0 C and digested for 180 minutes at this maximum temperature.
  • the initial pH was in the range of pH 8.0 to 9.5.
  • the open-grained spruce wood chips were shredded. 95.5% of the digested spruce wood chips passed through the strainer basket with a slot width of 0.2 mm. 4.5% of the digested material was retained here. Aliquots of the pulp so produced were ground for different lengths to determine the strength at different degrees of grinding. The energy required for defibering the partially digested spruce wood chips was less than 300 kWh / t of pulp.
  • the yield is 78.6% based on otro pulp.
  • the tenacity was measured at 14 0 SR at 8 km, the Tear index at 8.5 mN * m 2 / g.
  • the whiteness was determined after digestion at 41% ISO.
  • Birch wood chips are after a damping (90 minutes in saturated steam at 105 0 C) with a sodium sulfite digestion solution with the addition of 0.1% anthraquinone at a liquor ratio of wood: digestion solution 1: 3 added.
  • the total use of chemicals was 16.5% calculated as sodium sulfite, based on otro birch wood chips.
  • the birch chips impregnated with the chemical solution were heated to 170 ° C. and digested at this maximum temperature for 60 minutes (Example 2) or over 80 minutes (Example 3).
  • the birch wood chips were defibered. 97.5% of the digested birch wood chips (Example 2) passed the strainer basket with 0.2 mm slot width. So 2.5% rejects were detected that did not pass through the screen basket. 99% of the digested birch wood chips (Example 3) passed through the screen basket with 0.2 mm slot width. So i% rejects were detected that did not pass through the screen basket.
  • Example 2 For Example 2, a yield of 85.34% and a whiteness of 68.81% ISO were detected after digestion. At 20 0 SR, the birch has a tearing length of 8.4 km and a tear index of 6.9 mN * m 2 / g. For Example 3, a yield of 83.99% and a whiteness of 69.82% ISO were detected after digestion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

Le procédé selon l'invention consiste à fabriquer une solution chimique contenant moins de 25 % de sulfite (calculé en tant que Na2SO3) par rapport à la quantité séchée à l'étuve de la matière première lignocellulosique; à mélanger la solution chimique à la matière première lignocellulosique dans un rapport de bain prédéfini; à chauffer la solution chimique et la matière première lignocellulosique à une température supérieure à la température ambiante; puis (1) à éliminer la solution chimique à écoulement libre et décomposer la matière première lignocellulosique dans la phase vapeur; ou (2) à décomposer la matière première lignocellulosique en phase liquide et séparer la solution chimique à écoulement libre et la matière première lignocellulosique. Le procédé est caractérisé en ce que la matière première lignocellulosique décomposée est soumise à un premier défibrage: en cas de décomposition de bois résineux, jusqu'à 5 % du bois résineux décomposé ne passent pas le tri après le premier défibrage; en cas de décomposition de bois feuillu, jusqu'à 3 % du bois feuillu décomposé ne passent pas le tri après le premier défibrage; et en cas de décomposition de plantes annuelles, jusqu'à 2 % des plantes annuelles décomposées ne passent pas le tri après le premier défibrage.
PCT/EP2008/002573 2007-05-11 2008-04-01 Procédé de défibrage de matière première lignocellulosique traitée chimiquement WO2008138428A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710022750 DE102007022750A1 (de) 2007-05-11 2007-05-11 Verfahren zum Zerfasern von chemisch behandeltem lignocellulosischem Rohstoff
DE102007022750.9 2007-05-11

Publications (1)

Publication Number Publication Date
WO2008138428A1 true WO2008138428A1 (fr) 2008-11-20

Family

ID=39700924

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002573 WO2008138428A1 (fr) 2007-05-11 2008-04-01 Procédé de défibrage de matière première lignocellulosique traitée chimiquement

Country Status (2)

Country Link
DE (1) DE102007022750A1 (fr)
WO (1) WO2008138428A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB347297A (en) * 1929-12-30 1931-04-30 Joaquin Julio De La Roza Senio Method of manufacturing cellulose
GB841382A (en) * 1956-11-08 1960-07-13 Eugene Gilbert Voiret Improvements in the preparation of paper pulp from hemp and like annual plants
US20060266487A1 (en) * 2005-01-08 2006-11-30 Thomas Scherb Method for the production of tissue paper
EP1775380A2 (fr) * 2005-10-13 2007-04-18 Voith Paper Patent GmbH Procédé pour la fabrication de papier tissu
WO2007140839A2 (fr) * 2006-06-08 2007-12-13 Voith Patent Gmbh Procédé de préparation de matière fibreuse à partir de bois
WO2007140837A2 (fr) * 2006-06-08 2007-12-13 Voith Patent Gmbh Procédé de préparation de matière fibreuse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE308061B (fr) * 1964-12-18 1969-01-27 Svenska Cellulosa Ab

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB347297A (en) * 1929-12-30 1931-04-30 Joaquin Julio De La Roza Senio Method of manufacturing cellulose
GB841382A (en) * 1956-11-08 1960-07-13 Eugene Gilbert Voiret Improvements in the preparation of paper pulp from hemp and like annual plants
US20060266487A1 (en) * 2005-01-08 2006-11-30 Thomas Scherb Method for the production of tissue paper
EP1775380A2 (fr) * 2005-10-13 2007-04-18 Voith Paper Patent GmbH Procédé pour la fabrication de papier tissu
WO2007140839A2 (fr) * 2006-06-08 2007-12-13 Voith Patent Gmbh Procédé de préparation de matière fibreuse à partir de bois
WO2007140837A2 (fr) * 2006-06-08 2007-12-13 Voith Patent Gmbh Procédé de préparation de matière fibreuse

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LIEBEGOTT T JOACHIMIDES N: "choosing the best brightening process", PULP AND PAPER CANADA, ST LAURENT, CA, vol. 80, no. 12, 1 December 1979 (1979-12-01), pages 59 - 85, XP009094432 *
WORSTER H E: "Semichemical Pulping for Corrugating Grades", PULP AND PAPER MANUFACTURE, XX, XX, no. ED. 3, 1 January 1991 (1991-01-01), pages 130 - 138, XP002464677 *

Also Published As

Publication number Publication date
DE102007022750A1 (de) 2008-11-13

Similar Documents

Publication Publication Date Title
EP0764225B1 (fr) Pate de cellulose chimico-mecanique volumineuse a faible indice d'egouttage et a faible teneur en buchettes et en matieres a grains fins
DE102006027006A1 (de) Verfahren zum Herstellen von Faserstoff aus Holz
WO2007140838A2 (fr) Matière fibreuse lignocellulosique à partir de bois
EP2126195A1 (fr) Procédé de production de papier tissu
EP2029806A2 (fr) Procédé de préparation de matière fibreuse
DE10229546B4 (de) Verfahren zum Delignifizieren lignocellulosischer Rohstoffe
WO2009015699A1 (fr) Matière fibreuse lignocellulosique issue de plantes annuelles
WO2011063800A2 (fr) Procédé de fabrication de fibres de papier lignocellulosiques, papiers, cartons et cartons-pâtes à base de ces fibres
DE102007022753A1 (de) Verfahren zum Zerfasern von chemisch behandeltem, lignocellulosischem Rohstoff
DE102006061480A1 (de) Verfahren zum Herstellen von Faserstoff
WO2008138428A1 (fr) Procédé de défibrage de matière première lignocellulosique traitée chimiquement
Shafi et al. Pulping of whole length jute by neutral sulphite anthraquinone (NS-AQ) process
DE2714730C3 (de) Verfahren zur Herstellung eines thermo-mechanischen Stoffs aus Ligno-Zellulose enthaltendem faserhaltigem Material
EP2029808A2 (fr) Procédé de préparation de matière fibreuse à partir de bois
DE102007008955A1 (de) Verfahren zum Herstellen von Faserstoff aus Holz
DO Application of Thermomechanical Pulping Method for Fabricating Bamboo Fiber
US5427651A (en) Method for producing bleached sulfate pulp having a long fiber fraction and a short fiber fraction
WO2022027081A1 (fr) Procédé de fabrication de produits d'emballage à base de fibres de cellulose et produit d'emballage à base de fibres de cellulose
WO2022027080A1 (fr) Procédé de fabrication de produits d'emballage à base de fibres cellulosiques et produit d'emballage à base de fibres cellulosiques
DE10323376A1 (de) Verfahren zum Delignifizieren
DE2540917C3 (de) Verfahren und Vorrichtung zur Herstellung von verbessertem Hochausbeutezellstoff
WO2008138429A1 (fr) Matériau fibreux lignocellulosique en bois
DE2540917A1 (de) Herstellung von verbessertem hochausbeutezellstoff
DE102009010696A1 (de) Verfahren zur Herstellung von Magazinpapier
WO2009015701A1 (fr) Procédé de production de fines à partir de rebuts de matière fibreuse

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08734925

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08734925

Country of ref document: EP

Kind code of ref document: A1