EA200970367A1 - BLEACHING OF CELLULOSE - Google Patents

BLEACHING OF CELLULOSE

Info

Publication number
EA200970367A1
EA200970367A1 EA200970367A EA200970367A EA200970367A1 EA 200970367 A1 EA200970367 A1 EA 200970367A1 EA 200970367 A EA200970367 A EA 200970367A EA 200970367 A EA200970367 A EA 200970367A EA 200970367 A1 EA200970367 A1 EA 200970367A1
Authority
EA
Eurasian Patent Office
Prior art keywords
chlorine dioxide
bleaching
pulp
relates
final
Prior art date
Application number
EA200970367A
Other languages
Russian (ru)
Other versions
EA013901B1 (en
Inventor
Магнус Бьерклунд
Томас Кристофер Грескик
Хокан Фегерстен
Original Assignee
Акцо Нобель Н.В.
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=37807769&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EA200970367(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Акцо Нобель Н.В. filed Critical Акцо Нобель Н.В.
Publication of EA200970367A1 publication Critical patent/EA200970367A1/en
Publication of EA013901B1 publication Critical patent/EA013901B1/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

Настоящее изобретение относится к способу отбеливания целлюлозы, полученной способом щелочной варки, имеющей содержание гексуроновой кислоты перед конечной стадией отбеливания от приблизительно 1 до приблизительно 80 ммоль/кг сухой целлюлозы, причем указанный способ содержит три хлордиоксидные стадии D0, D1 и D2, где загрузка диоксида хлора по отношению к общей загрузке диоксида хлора в a) D0 составляет от приблизительно 40 до приблизительно 60%; b) D1 составляет от приблизительно 30 до приблизительно 55%; с) D2 составляет от приблизительно 4 до приблизительно 20% и где конечную хлордиоксидную стадию D2 осуществляют при рН от приблизительно 2 до приблизительно 4,5. Изобретение также относится к отбеленной целлюлозе, полученной настоящим способом.The present invention relates to a pulp bleaching method obtained by an alkaline cooking method having a hexuronic acid content before the final bleaching stage is from about 1 to about 80 mmol / kg dry pulp, and this method contains three stages of D0, D1 and D2, where chlorine dioxide loading in relation to the total chlorine dioxide loading in a) D0 is from about 40 to about 60%; b) D1 is from about 30 to about 55%; c) D2 is from about 4 to about 20% and where the final chlorine dioxide stage D2 is carried out at a pH of from about 2 to about 4.5. The invention also relates to bleached pulp obtained by the present method.

EA200970367A 2006-10-11 2007-09-06 Bleaching of pulp EA013901B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06122119 2006-10-11
PCT/SE2007/050630 WO2008044988A1 (en) 2006-10-11 2007-09-06 Bleaching of pulp

Publications (2)

Publication Number Publication Date
EA200970367A1 true EA200970367A1 (en) 2009-08-28
EA013901B1 EA013901B1 (en) 2010-08-30

Family

ID=37807769

Family Applications (1)

Application Number Title Priority Date Filing Date
EA200970367A EA013901B1 (en) 2006-10-11 2007-09-06 Bleaching of pulp

Country Status (12)

Country Link
EP (1) EP2082096B1 (en)
AR (1) AR063160A1 (en)
BR (1) BRPI0719893A2 (en)
CA (1) CA2665969C (en)
CL (1) CL2007002906A1 (en)
EA (1) EA013901B1 (en)
ES (1) ES2403371T3 (en)
NO (1) NO20091815L (en)
PT (1) PT2082096E (en)
UY (1) UY30634A1 (en)
WO (1) WO2008044988A1 (en)
ZA (1) ZA200903205B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20105862A0 (en) 2010-08-18 2010-08-18 Bo Akademi University METHOD FOR REMOVING HEXENURURIC ACIDS
WO2015018908A1 (en) 2013-08-09 2015-02-12 Novozymes A/S Reducing content of hexenuronic acids in cellulosic pulp

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501374A (en) * 1968-12-26 1970-03-17 Hooker Chemical Corp Sequential bleaching of kraft pulp with chlorine dioxide and chlorine
US5268075A (en) * 1989-10-19 1993-12-07 North Carolina State University High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process
US5030324A (en) * 1990-01-29 1991-07-09 Champion International Corporation Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process
US6776876B1 (en) * 1994-10-13 2004-08-17 Andritz Oy Method of treating cellulosic pulp to remove hexenuronic acid
FI119383B (en) * 1998-03-06 2008-10-31 Andritz Oy Procedure for treating pulp
WO2002099186A1 (en) * 2001-06-06 2002-12-12 Kvaerner Pulping Ab Reduction of organically bound chlorine formed in chlorine dioxide bleaching
US20060201642A1 (en) * 2005-03-08 2006-09-14 Andritz Inc. Methods of treating chemical cellulose pulp

Also Published As

Publication number Publication date
PT2082096E (en) 2013-04-26
ES2403371T3 (en) 2013-05-17
ZA200903205B (en) 2010-03-31
BRPI0719893A2 (en) 2014-05-06
WO2008044988A1 (en) 2008-04-17
CL2007002906A1 (en) 2008-05-02
NO20091815L (en) 2009-07-10
CA2665969A1 (en) 2008-04-17
EP2082096B1 (en) 2013-02-20
EA013901B1 (en) 2010-08-30
AR063160A1 (en) 2008-12-30
UY30634A1 (en) 2007-11-30
EP2082096A1 (en) 2009-07-29
CA2665969C (en) 2016-04-12

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Legal Events

Date Code Title Description
MM4A Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s)

Designated state(s): AM AZ BY KZ KG MD TJ TM

PC4A Registration of transfer of a eurasian patent by assignment
MM4A Lapse of a eurasian patent due to non-payment of renewal fees within the time limit in the following designated state(s)

Designated state(s): RU