WO2009015704A1 - Fibres blanchies - Google Patents

Fibres blanchies Download PDF

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Publication number
WO2009015704A1
WO2009015704A1 PCT/EP2008/002575 EP2008002575W WO2009015704A1 WO 2009015704 A1 WO2009015704 A1 WO 2009015704A1 EP 2008002575 W EP2008002575 W EP 2008002575W WO 2009015704 A1 WO2009015704 A1 WO 2009015704A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
bleached
lignin content
hardwood
lignin
Prior art date
Application number
PCT/EP2008/002575
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 WO2009015704A1 publication Critical patent/WO2009015704A1/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
    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing 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
    • D21C9/10—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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
    • 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

Definitions

  • the invention relates to a bleached pulp.
  • Bleached pulps are measured on known fibers, especially wood pulp and pulp.
  • the lignin the cement substance
  • the leading process for producing pulps is the kraft process.
  • the digestion is carried out in the kraft process with sulfides.
  • Other pulp digestion processes are the sulfite process or the soda process.
  • the sulfite process can be carried out with different process variants from the acidic to the neutral to the alkaline pH range.
  • a reduction of the original lignin content of the lignocellulosic raw material from about 20% to 28% based on the otro mass of the raw material to about 2.5% to 5% is sought.
  • the lignin content of the raw material can thus be reduced in the digestion readily to about 20% of the original lignin content.
  • the digestion conditions with the intermediates and degradation products of lignin and the residual lignin remaining in the pulp cause the pulp to have whiteness of 15% ISO to 60% ISO after digestion. The pulp is therefore too dark for most industrial applications.
  • Wood pulps to which refineries and high-yield pulps are reckoned at this point, are produced as far as possible without loss of yield, ie obtaining as high a native lignin content as possible. Wood pulps are bleached only with chemicals that do not degrade lignin to any appreciable extent. White levels of 8 O% ISO and above are not achievable for wood pulp.
  • Pulp fibers have high static and dynamic strengths and high degrees of whiteness.
  • the fiber optic properties such. B. Opacity or Buil are not good for pulp fibers.
  • Wood pulp fibers generally have low strengths at the same degrees of whiteness. But they offer good optical properties.
  • the object is to provide fibers which have good optical properties at high strengths and whitenesses at the same time.
  • a bleached wood pulp which has a whiteness of> 80% ISO and a buik of 13 cm 3 / g and at the same time a breaking length of more than 7.5 km at 15 0 SR and a lignin content of at least 13% based on the otro pulp for softwood bleached and having a breaking length of more than 5.0 km at 20 0 SR and a lignin content of at least 10% based on the otro pulp for hardwood in the bleached state, wherein the pulp bleached as possible ligninerhaltend after digestion becomes.
  • a pulp that bleaches to high whiteness while maintaining good fiber optic properties and strength properties is z.
  • B. prepared by lignocellulosic raw material is mixed with a sulfite solution and digested at high temperatures. The digestion is completed in time so that the yield at over 75% based on the otro raw material.
  • the pulp thus produced has a tenacity of more than 7.5 km at 15 ° SR and a lignin content of at least 13% based on the otro pulp for softwood in the bleached state.
  • For hardwood, such a pulp produced has a breaking length of more than 5.0 km at 20 0 SR and a lignin content of at least 10% based on the otro pulp in the bleached state.
  • the pulp after bleaching has a whiteness of at least 85% ISO for softwood pulp with a lignin content of more than 13% based on the otro softwood pulp and for hardwood pulp with a lignin content of more than 10% based on the otro hardwood pulp.
  • the pulp when the pulp is prepared by the above-described method using a sulfite solution, the pulp can be bleached even with a high lignin content to very high whiteness.
  • a bleached pulp which has a tenacity of more than 9 km, preferably of more than 10 km as a softwood pulp at 15 0 SR, and as a hardwood pulp at 20 0 SR a breaking length of more than 5.5 km having. If a fibrous material which has been digested with a sulfite solution is bleached, then the pulp can be lightened so gently that high strengths are retained.
  • the requirement for overall high strength properties is preferably followed by a bleached pulp which, as a softwood pulp, has a lignin content of more than 13% at 15 ° SR a tearing strength of more than 60 cN, preferably more than 70 cN, and which is hardwood. Fiber has a lignin content of more than 10% at 20 0 SR a tear strength of more than 50 cN.
  • the pulp according to the invention has both high static strength (tear length) and high dynamic strength (tear strength).
  • the pulp is bleached by a combination of bleaching agents, in particular by oxidizing and reducing chemicals.
  • the combination of several bleaches allows an individual Adaptation to the requirements of the bleached pulp.
  • Whiteness, builing, opacity and other properties of the bleached pulp can be individually adjusted in this way.
  • Suitable bleaching agents are both reductive and oxidative bleaches, preferably peroxide, formamidine sulfonic acid (FAS), dithianite, borole and / or peracetic acid. These bleaching agents can be used with economically justifiable plant and energy costs. A pulp bleached with these bleaches is very competitive in comparison to pulp and pulp.
  • FAS formamidine sulfonic acid
  • the lignocellulosic bleaching of a wood pulp alone with lignin-containing chemicals helps to maintain a high bulk.
  • the BuIk remains above 1,3 cm3 / g for wood pulp with a breaking length of more than 5 km at 20 ° SR for hardwood and softwood pulp with a breaking length of more than 7,5 km at 15 0 SR not yet known, especially when it comes to bleached fibers with a whiteness of more than 75% ISO.
  • lignocellulosic bleaching of lignocellulosic fibers which were produced in particular using sulfites, with lignocellulosic bleaches is explained in more detail below using exemplary embodiments.
  • the yield was calculated by weighing the raw material used and the pulp obtained after the digestion or the bleaching, in each case dried at 105 ° C. to constant weight (atro).
  • the density (BuIk) 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 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.
  • the opacity was determined according to the specification Zellcheming leaflet VI / 1/66.
  • the term "otro" in this document refers to "oven-dry" material which has been dried at 105 ° C. to constant weight.
  • Eucalyptus high yield pulp with an initial whiteness of 61% ISO was initially treated with a Q-grade. This was followed by peroxide bleaching and a final bleaching with formamidine sulfonic acid (FAS bleach).
  • FAS bleach formamidine sulfonic acid
  • the Q-step was performed with 0.2% DTPA at 3% consistency for 60 minutes and at a reaction temperature of 70 0 C.
  • the pH was adjusted to between 5 and 5.5 using 4 N sulfuric acid.
  • the whiteness was 65% ISO.
  • the subsequent peroxide stage was carried out with 3% peroxide, 1.5% NaOH, 0.1% MgSO 4 and 0.05% DTMPA. Consumption of 64% of the peroxide used reached a brightness of 81% ISO.
  • the P-stage was carried out for 180 minutes at 8o C and a consistency of 10%.
  • the final FAS-stage was carried out at 99 0 C over a period of 30 minutes at the consistency of 10%. Based on the otro eucalyptus high yield fiber, 0.4% NaOH, 0.3% Na 2 SiO 3 and 0.5% FAS were used. At the beginning of the bleaching, a pH of 10.2 was established. At the end of bleaching was measured a pH of 9.35. The final whiteness was determined to be 86.5% ISO.
  • the thus-bleached pulp was milled to a freeness of 20 ° SR within 4 minutes. At this freeness, a tearing length of 5.51 km and a tearing strength of 55.0 cN (100 g / m 2 ) were measured. The opacity is 82.5%. The BuIk was determined to be 1.39 cm 3 / g.

Landscapes

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

Abstract

La présente invention concerne une fibre blanchie tirée du bois ayant un degré de blanc selon ISO supérieur à 80% et un volume massique supérieur à 1,3 cm3/g, une longueur de rupture supérieure à 7,5 km à 15 °SR et une teneur en lignine d'au moins 13% rapportée aux fibres séchées à l'étuve de bois de conifères à l'état blanchi, et une longueur de rupture supérieure à 5,0 km à 20 °SR et une teneur en lignine d'au moins 10% rapportée aux fibres séchées à l'étuve de bois de feuillus à l'état blanchi. Ladite fibre est caractérisée en ce qu'elle est blanchie après cuisson, tout en conservant autant que possible sa lignine.
PCT/EP2008/002575 2007-07-31 2008-04-01 Fibres blanchies WO2009015704A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710036376 DE102007036376A1 (de) 2007-07-31 2007-07-31 Gebleichter Faserstoff
DE102007036376.3 2007-07-31

Publications (1)

Publication Number Publication Date
WO2009015704A1 true WO2009015704A1 (fr) 2009-02-05

Family

ID=39705144

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002575 WO2009015704A1 (fr) 2007-07-31 2008-04-01 Fibres blanchies

Country Status (2)

Country Link
DE (1) DE102007036376A1 (fr)
WO (1) WO2009015704A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB681661A (en) * 1950-03-08 1952-10-29 Buffalo Electro Chem Co Treatment of chemical pulp
GB684742A (en) * 1950-06-30 1952-12-24 Buffalo Electro Chem Co Method of bleaching chemical pulp
GB1519072A (en) * 1975-02-18 1978-07-26 Potlatch Corp Oxygen bleaching of pulp in the presence of high-silica protector
GB2005743A (en) * 1977-09-20 1979-04-25 Degussa A process for the production of softwood pulp for chemical further processing and for special papers
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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413684C (sv) * 1974-09-23 1987-05-18 Mo Och Domsjoe Ab Forfarande for framstellning av cellulosamassa i utbytesomradet 65-95 %
DE3739655A1 (de) * 1987-11-23 1989-06-01 Sued Chemie Ag Bleichmittelzusatz
DE4230655A1 (de) * 1992-09-14 1994-03-17 Ciba Geigy Verfahren zur Verbesserung von Weißgrad, Helligkeit und Farbort von Faserstoffen
SE514687C2 (sv) * 1999-07-09 2001-04-02 Sca Graphic Res Ab Metod för eliminering av skadliga substanser i en processvätska

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB681661A (en) * 1950-03-08 1952-10-29 Buffalo Electro Chem Co Treatment of chemical pulp
GB684742A (en) * 1950-06-30 1952-12-24 Buffalo Electro Chem Co Method of bleaching chemical pulp
GB1519072A (en) * 1975-02-18 1978-07-26 Potlatch Corp Oxygen bleaching of pulp in the presence of high-silica protector
GB2005743A (en) * 1977-09-20 1979-04-25 Degussa A process for the production of softwood pulp for chemical further processing and for special papers
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 *

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