WO1994017239A1 - Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent - Google Patents

Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent Download PDF

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Publication number
WO1994017239A1
WO1994017239A1 PCT/SE1994/000054 SE9400054W WO9417239A1 WO 1994017239 A1 WO1994017239 A1 WO 1994017239A1 SE 9400054 W SE9400054 W SE 9400054W WO 9417239 A1 WO9417239 A1 WO 9417239A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
peroxide
acid
bleaching
acetic acid
Prior art date
Application number
PCT/SE1994/000054
Other languages
English (en)
French (fr)
Inventor
Erik Nilsson
Petter Tibbling
Original Assignee
Kvaerner Pulping Technologies 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 Kvaerner Pulping Technologies Ab filed Critical Kvaerner Pulping Technologies Ab
Priority to JP6516930A priority Critical patent/JPH08505907A/ja
Priority to AU59820/94A priority patent/AU675291B2/en
Priority to EP94905899A priority patent/EP0681624A1/en
Priority to BR9406193A priority patent/BR9406193A/pt
Publication of WO1994017239A1 publication Critical patent/WO1994017239A1/en
Priority to NO952935A priority patent/NO305763B1/no
Priority to FI953589A priority patent/FI111387B/sv

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
    • 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
    • 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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • 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

Definitions

  • the present invention relates to a method of bleaching pulp of cellulosic fibre material without the use of chlorine when manufacturing chemical pulp, wherein the pulp entering is fed continuously in a bleaching line and is treated with a sequestering agent in the presence of at least one acid in order to adjust the pH to a value below 7 and is thereafter bleached in a sequence of several stages consisting of peroxide, one or more organic per-acids and peroxide.
  • US-A-3,867, 246 corresponding to SE-B-405130 describes another bleaching process without the use of chlorine, including the sequence peroxide, peracetic acid and peroxide, the first peroxide stage being preceded by treatment with sequestering agent in the presence of an acid in order to adjust a low pH value.
  • the acid used is generally sulphuric acid.
  • peracetic acid has a strongly decomposing effect on the cellulose.
  • the object of the present invention is to solve the drawback in bleaching pulp without the use of chlorine, using peracetic acid in combination with peroxide in the bleaching sequence PPaP preceded by treatment with a sequestering agent (Q) in the presence of an acid, so that a ready-bleached pulp is obtained that has acceptable viscosity and strength properties and a brightness of 85-90% ISO requested by the market.
  • a sequestering agent Q
  • the method according to the invention is characterised in that during the treatment with the sequestering agent the pulp is acidified with acetic acid.
  • the pulp entering is preferably produced by means of a digestion process giving a low Kappa number, and is thereafter subjected to delignification with oxygen gas to that the pulp obtains a Kappa number of about 12 or less and a viscosity of at least about 1000 dm ⁇ /kg.
  • the peroxide used is preferably hydrogen peroxide.
  • the second bleaching stage following the first peroxide stage, is performed using performic acid, peracetic acid or perpropionic acid, preferably peracetic acid or a mixture of at least two of said per-acids.
  • acetic acid is added in such an amount that the pH value is below 6, preferably below 5.
  • the temperature during all bleaching stages should be 80°C or above, preferably 90°C.
  • Each peroxide stage is suitably performed in alkaline solution.
  • the peracetic acid stage is preferably performed in acid solution.
  • Acetic acid and peracetic acid, or other suitable per- -acids are preferably manufactured on site.
  • the consistency of the pulp during the various treatment stages is about 8-16%, preferably 9-11%.
  • Pa-stage 1 Peracetic acid calculated as total H 2 0 2 , kg/BDMT 20 30 20 30

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
PCT/SE1994/000054 1993-01-29 1994-01-26 Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent WO1994017239A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP6516930A JPH08505907A (ja) 1993-01-29 1994-01-26 酸性化剤として酢酸を用いるパルプの塩素無含有漂白方法
AU59820/94A AU675291B2 (en) 1993-01-29 1994-01-26 Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent
EP94905899A EP0681624A1 (en) 1993-01-29 1994-01-26 Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent
BR9406193A BR9406193A (pt) 1993-01-29 1994-01-26 Processo para alvejar pasta de material de fibra celulósica sem o uso de cloro
NO952935A NO305763B1 (no) 1993-01-29 1995-07-24 FremgangsmÕte ved klorfri bleking av masse ved anvendelse av eddiksyre som surgj°rende middel
FI953589A FI111387B (sv) 1993-01-29 1995-07-27 Förfarande för klorfri blekning av massa med ättiksyra som surgörningsmedel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9300277A SE501325E (sv) 1993-01-29 1993-01-29 Förfarande för klorfri blekning av massa, varvid massan surgöres med ättiksyra vid behandlingen med komplexbildare
SE9300277-2 1993-01-29

Publications (1)

Publication Number Publication Date
WO1994017239A1 true WO1994017239A1 (en) 1994-08-04

Family

ID=20388704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1994/000054 WO1994017239A1 (en) 1993-01-29 1994-01-26 Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent

Country Status (10)

Country Link
EP (1) EP0681624A1 (sv)
JP (1) JPH08505907A (sv)
CN (1) CN1117301A (sv)
AU (1) AU675291B2 (sv)
BR (1) BR9406193A (sv)
CA (1) CA2154076A1 (sv)
FI (1) FI111387B (sv)
NO (1) NO305763B1 (sv)
SE (1) SE501325E (sv)
WO (1) WO1994017239A1 (sv)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1050642C (zh) * 1996-06-25 2000-03-22 华南理工大学 高浓纸浆过氧化氢漂白方法
CN103726382B (zh) * 2013-12-31 2016-08-17 安徽泾县千年古宣宣纸有限公司 一种纯草型宣纸及其无氯漂白生产工艺
EP3882380B1 (en) * 2020-03-16 2022-04-27 Re:NewCell AB One stage method for acid metal removal and bleach

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867246A (en) * 1972-04-21 1975-02-18 Degussa Chlorine-free multiple step bleaching of cellulose
DE2841013C2 (de) * 1978-09-21 1984-06-07 Degussa Ag, 6000 Frankfurt Verfahren zur Vollbleiche von Zellstoff
EP0402335A2 (en) * 1989-06-06 1990-12-12 Eka Nobel Ab Process for bleaching lignocellulose-containing pulps
EP0512590A1 (en) * 1991-04-30 1992-11-11 Eka Nobel Ab Process for bleaching of lignocellulose-containing material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867246A (en) * 1972-04-21 1975-02-18 Degussa Chlorine-free multiple step bleaching of cellulose
DE2841013C2 (de) * 1978-09-21 1984-06-07 Degussa Ag, 6000 Frankfurt Verfahren zur Vollbleiche von Zellstoff
EP0402335A2 (en) * 1989-06-06 1990-12-12 Eka Nobel Ab Process for bleaching lignocellulose-containing pulps
EP0512590A1 (en) * 1991-04-30 1992-11-11 Eka Nobel Ab Process for bleaching of lignocellulose-containing material

Also Published As

Publication number Publication date
CN1117301A (zh) 1996-02-21
CA2154076A1 (en) 1994-08-04
SE501325E (sv) 1999-09-20
FI111387B (sv) 2003-07-15
NO952935L (no) 1995-09-13
JPH08505907A (ja) 1996-06-25
SE501325C2 (sv) 1995-01-16
SE9300277D0 (sv) 1993-01-29
FI953589A0 (sv) 1995-07-27
NO952935D0 (no) 1995-07-24
AU675291B2 (en) 1997-01-30
BR9406193A (pt) 1996-01-09
NO305763B1 (no) 1999-07-19
FI953589A (sv) 1995-07-27
AU5982094A (en) 1994-08-15
EP0681624A1 (en) 1995-11-15
SE9300277L (sv) 1994-07-30

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