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AU5546498A - Oxygen delignification process of pulp - Google Patents

Oxygen delignification process of pulp

Info

Publication number
AU5546498A
AU5546498A AU55464/98A AU5546498A AU5546498A AU 5546498 A AU5546498 A AU 5546498A AU 55464/98 A AU55464/98 A AU 55464/98A AU 5546498 A AU5546498 A AU 5546498A AU 5546498 A AU5546498 A AU 5546498A
Authority
AU
Australia
Prior art keywords
pulp
stage
oxygen delignification
reducing agent
oxygen
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
AU55464/98A
Inventor
Guo Jun Kang
Yonghao Ni
Adriaan R. P. Van Heiningen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of New Brunswick
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
Publication of AU5546498A publication Critical patent/AU5546498A/en
Abandoned legal-status Critical Current

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
    • D21C9/147—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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

The present invention is concerned with a single stage method delignification process for pulps, preferably sulphite pulps. The improvement to conventional oxygen delignification process comprises in situ addition of a reducing agent substantially non-reactive with oxygen. The end result is a pulp having enhanced strength properties and higher viscosity. Sodium borohydride is the preferred reducing agent, and MgO is the preferred alkali source. Similar results can be obtained with a two-stage oxygen delignification wherein the pulp is treated with the reducing agent in the first stage, and then washed and pressed conventionally before proceeding with the oxygen delignification in a second stage.
AU55464/98A 1997-01-21 1998-01-19 Oxygen delignification process of pulp Abandoned AU5546498A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US78621697A 1997-01-21 1997-01-21
US08786216 1997-01-21
PCT/CA1998/000020 WO1998031872A1 (en) 1997-01-21 1998-01-19 Oxygen delignification process of pulp

Publications (1)

Publication Number Publication Date
AU5546498A true AU5546498A (en) 1998-08-07

Family

ID=25137931

Family Applications (1)

Application Number Title Priority Date Filing Date
AU55464/98A Abandoned AU5546498A (en) 1997-01-21 1998-01-19 Oxygen delignification process of pulp

Country Status (6)

Country Link
EP (1) EP0960235B1 (en)
AT (1) ATE216741T1 (en)
AU (1) AU5546498A (en)
CA (1) CA2278188C (en)
DE (1) DE69805056T2 (en)
WO (1) WO1998031872A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9932709B2 (en) 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production
BR102014027199B1 (en) * 2014-07-14 2022-10-04 Nalco Company METHOD TO IMPROVE THE MANUFACTURING OF SODA OR KRAFT PULP
WO2018022427A1 (en) * 2016-07-27 2018-02-01 Ecolab USA, Inc. Method and compositions for oxygen delignification of chemical pulp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809332A1 (en) * 1988-03-19 1989-10-05 Degussa Multi-stage process for bleaching wood pulps
FR2692917A1 (en) * 1992-06-30 1993-12-31 Air Liquide Chemical pulp bleaching - using ozone followed by borohydride treatment, to avoid degradation during complementary bleaching step
SE502135C2 (en) * 1994-08-16 1995-08-28 Kvaerner Pulping Tech Chemical pulp bleaching sequence comprising a sulfonating bleaching step
CA2157154A1 (en) * 1994-08-29 1996-03-01 Gordon Leary Bleaching of high-yield pulps with oxygen

Also Published As

Publication number Publication date
EP0960235B1 (en) 2002-04-24
WO1998031872A1 (en) 1998-07-23
DE69805056T2 (en) 2002-11-14
ATE216741T1 (en) 2002-05-15
EP0960235A1 (en) 1999-12-01
CA2278188C (en) 2003-11-25
CA2278188A1 (en) 1998-07-23
DE69805056D1 (en) 2002-05-29

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