SE0300608D0 - Method for bleaching cellulose pulp - Google Patents

Method for bleaching cellulose pulp

Info

Publication number
SE0300608D0
SE0300608D0 SE0300608A SE0300608A SE0300608D0 SE 0300608 D0 SE0300608 D0 SE 0300608D0 SE 0300608 A SE0300608 A SE 0300608A SE 0300608 A SE0300608 A SE 0300608A SE 0300608 D0 SE0300608 D0 SE 0300608D0
Authority
SE
Sweden
Prior art keywords
pulp
chlorine dioxide
bleaching
cellulose pulp
minutes
Prior art date
Application number
SE0300608A
Other languages
Swedish (sv)
Other versions
SE0300608L (en
SE524896C2 (en
Inventor
Martin Ragnar
Marcelo R Leite
Original Assignee
Kvaerner Pulping Tech
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 Tech filed Critical Kvaerner Pulping Tech
Priority to SE0300608A priority Critical patent/SE524896C2/en
Publication of SE0300608D0 publication Critical patent/SE0300608D0/en
Priority to EP04717335A priority patent/EP1604061A1/en
Priority to US10/547,038 priority patent/US20060118260A1/en
Priority to PCT/SE2004/000303 priority patent/WO2004079087A1/en
Priority to BRPI0408171-4A priority patent/BRPI0408171A/en
Priority to JP2006507938A priority patent/JP2006519939A/en
Publication of SE0300608L publication Critical patent/SE0300608L/en
Publication of SE524896C2 publication Critical patent/SE524896C2/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
    • D21C9/142—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively

Abstract

The method is for bleaching cellulose pulp having an MC consistency in a first step with chlorine dioxide in a bleaching sequence with several bleaching steps. The pulp is bleached in this first chlorine dioxide step in a first phase at a lower temperature of 60±10° C. during a retention time of from 30 seconds to 30 minutes, after which the pulp is heated by at least 10° C. to a reaction temperature of 90±10° C. for a second phase, which has a retention time of 60-200 minutes, With this process modification of a first chlorine dioxide step, an efficient destruction of undesired organic acids is obtained, while at the same time improved viscosity/strength of the pulp can be obtained of the finally bleached pulp with a whiteness of approximately 90% ISO.
SE0300608A 2003-03-07 2003-03-07 Bleaching of cellulose pulp with chlorine dioxide in two phases with heating between the phases SE524896C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE0300608A SE524896C2 (en) 2003-03-07 2003-03-07 Bleaching of cellulose pulp with chlorine dioxide in two phases with heating between the phases
EP04717335A EP1604061A1 (en) 2003-03-07 2004-03-04 Bleaching of cellulose pulp in a first chlorine dioxide bleaching step
US10/547,038 US20060118260A1 (en) 2003-03-07 2004-03-04 Bleaching of cellulose pulp in a first chlorine dioxide bleaching step
PCT/SE2004/000303 WO2004079087A1 (en) 2003-03-07 2004-03-04 Bleaching of cellulose pulp in a first chlorine dioxide bleaching step
BRPI0408171-4A BRPI0408171A (en) 2003-03-07 2004-03-04 method for bleaching pulp pulp in a first chlorine dioxide bleaching step
JP2006507938A JP2006519939A (en) 2003-03-07 2004-03-04 Cellulose pulp bleaching method in the first chlorine dioxide bleaching step

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0300608A SE524896C2 (en) 2003-03-07 2003-03-07 Bleaching of cellulose pulp with chlorine dioxide in two phases with heating between the phases

Publications (3)

Publication Number Publication Date
SE0300608D0 true SE0300608D0 (en) 2003-03-07
SE0300608L SE0300608L (en) 2004-09-08
SE524896C2 SE524896C2 (en) 2004-10-19

Family

ID=20290593

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0300608A SE524896C2 (en) 2003-03-07 2003-03-07 Bleaching of cellulose pulp with chlorine dioxide in two phases with heating between the phases

Country Status (6)

Country Link
US (1) US20060118260A1 (en)
EP (1) EP1604061A1 (en)
JP (1) JP2006519939A (en)
BR (1) BRPI0408171A (en)
SE (1) SE524896C2 (en)
WO (1) WO2004079087A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050173082A1 (en) * 1998-08-24 2005-08-11 Arbozon Oy Ltd. Bleaching of medium consistency pulp with ozone without high shear mixing
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
US8262856B2 (en) 2007-06-18 2012-09-11 Andritz Inc. Processes and systems for the bleaching of lignocellulosic pulps following cooking with soda and anthraquinone

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745065A (en) * 1971-09-07 1973-07-10 Cons Paper Inc Control of chlorine dioxide bleaching
CA2069322A1 (en) * 1989-10-19 1991-04-20 Hou-Min Chang High efficiency chlorine dioxide pulp bleaching process
FI119383B (en) * 1998-03-06 2008-10-31 Andritz Oy Procedure for treating pulp
SE0002198L (en) * 2000-06-13 2001-12-14 Valmet Fibertech Ab Bleaching of pulp
US20050051288A1 (en) * 2003-09-09 2005-03-10 Caifang Yin Extended retention and medium consistency pulp treatment

Also Published As

Publication number Publication date
SE0300608L (en) 2004-09-08
BRPI0408171A (en) 2006-03-21
US20060118260A1 (en) 2006-06-08
EP1604061A1 (en) 2005-12-14
JP2006519939A (en) 2006-08-31
WO2004079087A1 (en) 2004-09-16
SE524896C2 (en) 2004-10-19

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Legal Events

Date Code Title Description
NUG Patent has lapsed