SE0100977L - Bleaching of pulp with chlorine dioxide - Google Patents

Bleaching of pulp with chlorine dioxide

Info

Publication number
SE0100977L
SE0100977L SE0100977A SE0100977A SE0100977L SE 0100977 L SE0100977 L SE 0100977L SE 0100977 A SE0100977 A SE 0100977A SE 0100977 A SE0100977 A SE 0100977A SE 0100977 L SE0100977 L SE 0100977L
Authority
SE
Sweden
Prior art keywords
pulp
chlorine dioxide
bleaching
metal ions
concentration
Prior art date
Application number
SE0100977A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE0100977D0 (en
SE518692C2 (en
Inventor
Ann-Sofi Naesholm
Original Assignee
Metso Paper Inc
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 Metso Paper Inc filed Critical Metso Paper Inc
Priority to SE0100977A priority Critical patent/SE518692C2/en
Publication of SE0100977D0 publication Critical patent/SE0100977D0/en
Priority to AT0904102A priority patent/AT412482B/en
Priority to US10/472,297 priority patent/US20040112556A1/en
Priority to CA2435813A priority patent/CA2435813C/en
Priority to PCT/SE2002/000287 priority patent/WO2002075046A1/en
Publication of SE0100977L publication Critical patent/SE0100977L/en
Publication of SE518692C2 publication Critical patent/SE518692C2/en
Priority to FI20031338A priority patent/FI120652B/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process

Landscapes

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

Abstract

The present invention relates to a method for end-bleaching of pulp containing metal ions after a sequence comprising alkaline bleaching stages only and optionally treatment with complex forming agent, wherein the end-bleaching comprises two chlorine dioxide stages at a pulp concentration of 8-20% and pH 2.5-4.5 wherein the pulp after the first chlorine dioxide stage is washed and dewatered to a concentration of 12-50% for removal of the out-dissolved metal ions and that alkali thereupon is added to the pulp for fast alkali extraction and increase of pH to 8-14, whereupon the pulp is provided with acid and chlorine dioxide and introduced into the second chlorine dioxide stage.
SE0100977A 2001-03-20 2001-03-20 Bleaching of pulp with chlorine dioxide SE518692C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE0100977A SE518692C2 (en) 2001-03-20 2001-03-20 Bleaching of pulp with chlorine dioxide
AT0904102A AT412482B (en) 2001-03-20 2002-02-19 BLEACHING POWDER WITH CHLORIDE DIOXIDE
US10/472,297 US20040112556A1 (en) 2001-03-20 2002-02-19 Bleaching of pulp with chlorine dioxide
CA2435813A CA2435813C (en) 2001-03-20 2002-02-19 Bleaching of pulp with chlorine dioxide after alkaline bleaching
PCT/SE2002/000287 WO2002075046A1 (en) 2001-03-20 2002-02-19 Bleaching of pulp with chlorine dioxide
FI20031338A FI120652B (en) 2001-03-20 2003-09-18 Process for the final bleaching of a metal ion-containing pulp with chlorine dioxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0100977A SE518692C2 (en) 2001-03-20 2001-03-20 Bleaching of pulp with chlorine dioxide

Publications (3)

Publication Number Publication Date
SE0100977D0 SE0100977D0 (en) 2001-03-20
SE0100977L true SE0100977L (en) 2002-09-21
SE518692C2 SE518692C2 (en) 2002-11-05

Family

ID=20283448

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0100977A SE518692C2 (en) 2001-03-20 2001-03-20 Bleaching of pulp with chlorine dioxide

Country Status (6)

Country Link
US (1) US20040112556A1 (en)
AT (1) AT412482B (en)
CA (1) CA2435813C (en)
FI (1) FI120652B (en)
SE (1) SE518692C2 (en)
WO (1) WO2002075046A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7976677B2 (en) * 2006-12-18 2011-07-12 International Paper Company Process of bleaching hardwood pulps in a D1 or D2 stage in a presence of a weak base
US7976676B2 (en) 2006-12-18 2011-07-12 International Paper Company Process of bleaching softwood pulps in a D1 or D2 stage in a presence of a weak base
SE532370C2 (en) * 2008-02-28 2009-12-29 Metso Paper Inc Method of bleaching a pulp
US9946351B2 (en) * 2015-02-23 2018-04-17 SomniQ, Inc. Empathetic user interface, systems, and methods for interfacing with empathetic computing device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238281A (en) * 1979-04-30 1980-12-09 Canadian International Paper Company Simplified bleaching process
SE466062B (en) * 1990-04-30 1991-12-09 Sunds Defibrator Ind Ab CHEMISTRY OF CHEMICAL MASS
US5938892A (en) * 1991-01-28 1999-08-17 Champion International Corporation Process for recycling bleach plant filtrate
US6706143B1 (en) * 1996-03-19 2004-03-16 International Paper Company Minimizing chlorinated organics in pulp bleaching processes
US6475338B1 (en) * 1996-06-05 2002-11-05 Andritz Inc. Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester

Also Published As

Publication number Publication date
AT412482B (en) 2005-03-25
SE0100977D0 (en) 2001-03-20
FI20031338A (en) 2003-09-18
US20040112556A1 (en) 2004-06-17
FI120652B (en) 2010-01-15
SE518692C2 (en) 2002-11-05
CA2435813A1 (en) 2002-09-26
CA2435813C (en) 2010-04-27
WO2002075046A1 (en) 2002-09-26
ATA90412002A (en) 2004-08-15

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Legal Events

Date Code Title Description
NUG Patent has lapsed