WO2009117818A4 - Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide - Google Patents

Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide Download PDF

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Publication number
WO2009117818A4
WO2009117818A4 PCT/CA2009/000367 CA2009000367W WO2009117818A4 WO 2009117818 A4 WO2009117818 A4 WO 2009117818A4 CA 2009000367 W CA2009000367 W CA 2009000367W WO 2009117818 A4 WO2009117818 A4 WO 2009117818A4
Authority
WO
WIPO (PCT)
Prior art keywords
chlorine dioxide
range
mixture
pulp
magnesium hydroxide
Prior art date
Application number
PCT/CA2009/000367
Other languages
French (fr)
Other versions
WO2009117818A1 (en
Inventor
Yonghao Ni
Zhibin He
Original Assignee
University Of New Brunswick
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 University Of New Brunswick filed Critical University Of New Brunswick
Priority to US12/736,292 priority Critical patent/US20110042022A1/en
Priority to CA2719500A priority patent/CA2719500A1/en
Publication of WO2009117818A1 publication Critical patent/WO2009117818A1/en
Publication of WO2009117818A4 publication Critical patent/WO2009117818A4/en

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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
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Abstract

The present invention provides an improved process for chlorine dioxide bleaching of chemical pulps in an aqueous suspension, which uses magnesium hydroxide or magnesium oxide. The process involves the addition of magnesium hydroxide or magnesium oxide to the pulp, in addition to chlorine dioxide, maintaining the mixture at a pH between about 2.5 to 7.5 for about 1 or more hours, most suitably between about 1 - 4 hours. This process can be used in the D1 or D2 stage of a typical D0EopD1E2D2 bleaching sequence, as well as in the chlorine dioxide brightening stage of other three, four, five, and six-stage bleaching sequences of either the so-called ECF process, or those containing elemental chlorine (Cl2). The temperature is between about 40 to about 90°C, and the pulp consistency is between about 1 to about 16%.

Claims

AMENDED CLAIMS received by the International Bureau on21 September 2009
1. A process for bleaching chemical pulp of the type characterized by a
D0E0PD-1E2D2 bleaching sequence in which
D0: chlorine dioxide delignification, with the pH controlled in a range from about 2 to about 3;
Eop: alkaline extraction with caustic soda, pH is in the range of 10-11.5;
Di: first chlorine dioxide brightening stage with pH controlled in a range from about 2.5 to about 7.5;
E2: the second alkaline extraction, the end pH is in the range from about 9.5 to about 11.5;
D2: the second chlorine dioxide brightening stage, the end pH controlled in a range from about 2.5 to about 7.5, wherein the process comprises the steps of: bleaching chemical pulps in the Di and/or D2 stages using chlorine dioxide, including adding chlorine dioxide and magnesium hydroxide or magnesium oxide in the absence of oxygen to a suspension of the chemical pulp to form a mixture, wherein the chlorine dioxide and magnesium hydroxide are added in a sequential order or simultaneously, including maintaining the mixture at a pH between about 2.5 to about 7.5 for about 1 or more hours, and maintaining the mixture at a temperature in a range from about 4O0C to about 900C, and maintaining a pulp consistency in a range between about 1 to about 16% weight percentage on dried mass of pulp.
2. The process according to claim 1 wherein said temperature is maintained in a range from about 550C to about 8O0C.
3. The process according to claim 1 or 2 including maintaining the mixture at a pH between about 3 to about 7 for between about 1 to about 4 hours.
4. The process according to claim 1 or 2 wherein said pH of the mixture is maintained in a range from about 3 to about 6.
5. The process according to claim 1 , 2, 3 or 4 wherein said pulp consistency is maintained between about 3 to about 12%.
13
PCT/CA2009/000367 2008-03-25 2009-03-25 Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide WO2009117818A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/736,292 US20110042022A1 (en) 2008-03-25 2009-03-25 Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide
CA2719500A CA2719500A1 (en) 2008-03-25 2009-03-25 Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6475708P 2008-03-25 2008-03-25
US61/064,757 2008-03-25

Publications (2)

Publication Number Publication Date
WO2009117818A1 WO2009117818A1 (en) 2009-10-01
WO2009117818A4 true WO2009117818A4 (en) 2009-11-19

Family

ID=41112884

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2009/000367 WO2009117818A1 (en) 2008-03-25 2009-03-25 Process of chlorine dioxide bleaching of chemical pulps using magnesium hydroxide or magnesium oxide

Country Status (3)

Country Link
US (1) US20110042022A1 (en)
CA (1) CA2719500A1 (en)
WO (1) WO2009117818A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI1012256A2 (en) * 2009-06-23 2019-04-16 American Process Inc biorefinery process and process for enzymatic hydrolysis of cellulose fiber
CN104928964B (en) * 2014-03-18 2017-02-15 中国科学院大连化学物理研究所 Method for reducing generation of dioxins in non-wood pulp papermaking chlorine bleaching process

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030024664A1 (en) * 2001-02-27 2003-02-06 Gibson Aileen Reyes Eop & Ep process for bleaching of chemical pulp
US8317975B2 (en) * 2004-04-20 2012-11-27 The Research Foundation Of The State University Of New York Product and processes from an integrated forest biorefinery
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

Also Published As

Publication number Publication date
WO2009117818A1 (en) 2009-10-01
US20110042022A1 (en) 2011-02-24
CA2719500A1 (en) 2009-10-01

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