SE9403074D0 - Pulp bleaching process - Google Patents

Pulp bleaching process

Info

Publication number
SE9403074D0
SE9403074D0 SE9403074A SE9403074A SE9403074D0 SE 9403074 D0 SE9403074 D0 SE 9403074D0 SE 9403074 A SE9403074 A SE 9403074A SE 9403074 A SE9403074 A SE 9403074A SE 9403074 D0 SE9403074 D0 SE 9403074D0
Authority
SE
Sweden
Prior art keywords
pulp
pulp bleaching
prod
iso
brightness
Prior art date
Application number
SE9403074A
Other languages
Swedish (sv)
Other versions
SE516353E (en
SE516353C2 (en
SE9403074L (en
Inventor
Mattti Nummenaho
Olavi Pikka
Hannu Roenkoenharju
Original Assignee
Ahlstroem Oy
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8538599&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE9403074(D0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ahlstroem Oy filed Critical Ahlstroem Oy
Publication of SE9403074D0 publication Critical patent/SE9403074D0/en
Publication of SE9403074L publication Critical patent/SE9403074L/en
Publication of SE516353C2 publication Critical patent/SE516353C2/en
Publication of SE516353E publication Critical patent/SE516353E/en

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
    • D21C9/163—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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Pulp is (a) cooked (b) treated wit EDTA, DTPA and/or acidified to remove heavy metals (c) delignified in at least 2 oxygen stages with no wash between them (d) bleached with O2, O3, ClO2 and/or H2O2 to give a bleached pulp prod. with at least ISO 80 brightness. Pulp bleaching with Cl2 free cpds. Cl2 and O3 use can be avoided. Brightness of prod. can be increased to ISO 90 if needed by using an O3 stage in place of H2O2. Pollution is lowered.
SE9403074A 1993-09-15 1994-09-14 Pulp bleaching process SE516353E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI934056A FI98224B (en) 1993-09-15 1993-09-15 Method for bleaching of pulp

Publications (4)

Publication Number Publication Date
SE9403074D0 true SE9403074D0 (en) 1994-09-14
SE9403074L SE9403074L (en) 1995-03-16
SE516353C2 SE516353C2 (en) 2001-12-17
SE516353E SE516353E (en) 2003-06-04

Family

ID=8538599

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9403074A SE516353E (en) 1993-09-15 1994-09-14 Pulp bleaching process

Country Status (3)

Country Link
CA (1) CA2132056C (en)
FI (1) FI98224B (en)
SE (1) SE516353E (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6514380B1 (en) * 1995-03-08 2003-02-04 Andritz Oy Treatment of chemical pulp
WO1997036042A1 (en) 1996-03-26 1997-10-02 Sunds Defibrator Industries Ab Oxygen delignification of pulp in two stages
CN100417500C (en) 1998-06-17 2008-09-10 尼勒纤维纸浆和纸公司 Arundo donax pulp, paper product and flakeboard
US20030029589A1 (en) * 1998-06-17 2003-02-13 Nile Fiber Pulp & Paper, Inc. Total chlorine free bleaching of Arundo donax pulp
FI117391B (en) 2000-05-16 2006-09-29 Andritz Oy Method and apparatus for pulping

Also Published As

Publication number Publication date
SE516353E (en) 2003-06-04
CA2132056C (en) 1998-11-24
CA2132056A1 (en) 1995-03-16
FI98224B (en) 1997-01-31
SE516353C2 (en) 2001-12-17
FI934056A0 (en) 1993-09-15
SE9403074L (en) 1995-03-16
FI934056A (en) 1995-03-16

Similar Documents

Publication Publication Date Title
SE9503595D0 (en) Method of treating cellulose pulps
FI952552A0 (en) Method for delignifying lignocellulosic pulp
SE9200107L (en) Delignifying and bleaching lignocellulosic pulps - by digesting then treating in oxygen and ozone stages
FI963985A0 (en) Process for complex treatment of pulp in connection with a chlorine dioxide step
FI964466A (en) Process for producing extremely pale pulp
WO1994023118A3 (en) Bleaching recycled pulp with a reductive-oxidative sequence
DE59007341D1 (en) Process for chlorine-free bleaching of cellulose.
SE9700992L (en) Procedure for bleaching of pulp
ES2169132T3 (en) METHOD FOR THE MANUFACTURE OF WHITE CELLULOSE PASTE.
SE9403074L (en) Pulp bleaching process
NZ238830A (en) Continuous two stage bleaching process of pulp by treating portions of the pulp in the latter stages with peroxide; paper products and pulp produced thereby
DE69008042T2 (en) Oxygen delignification enhanced with hydrogen peroxide.
WO1994023117A3 (en) Bleaching recycled pulp with ozone and hydrogen peroxide
ES2038954A6 (en) Bleaching of paper pulp
SE9401628D0 (en) Oxygen delignification procedure
SE9600773L (en) Average consistency-brightness enhancement with ozone of high-consistency-ozone bleached mass
SE9301984D0 (en) SEATING WHITE PILLOW WITHOUT USING CHLORIC CHEMICALS
SE9300277D0 (en) CHLORINE-FREE Mass Bleaching
SE9604094D0 (en) Pulp bleaching process
NO950954L (en) Method of mass bleaching
SE9604511L (en) Procedure for bleaching of pulp
SE8107858L (en) PROCEDURE FOR DELIGNIFICATING WHITE CELLULOSAMASSA
NO984593L (en) Method of Bleaching Chemical Pulp
NO920829D0 (en) PROCEDURE FOR WHITE CELLULOSE IN ALIFATIC MONOCARBOXYLIC ACIDS
SE9503694D0 (en) Bleaching of pulp

Legal Events

Date Code Title Description
RPOP Patent has been republished in amended form after opposition
NUG Patent has lapsed