CA2278188A1 - Oxygen delignification process of pulp - Google Patents

Oxygen delignification process of pulp Download PDF

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Publication number
CA2278188A1
CA2278188A1 CA002278188A CA2278188A CA2278188A1 CA 2278188 A1 CA2278188 A1 CA 2278188A1 CA 002278188 A CA002278188 A CA 002278188A CA 2278188 A CA2278188 A CA 2278188A CA 2278188 A1 CA2278188 A1 CA 2278188A1
Authority
CA
Canada
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.)
Granted
Application number
CA002278188A
Other languages
French (fr)
Other versions
CA2278188C (en
Inventor
Guo Jun Kang
Yonghao Ni
Anastasios Skothos
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
Individual
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 Individual filed Critical Individual
Publication of CA2278188A1 publication Critical patent/CA2278188A1/en
Application granted granted Critical
Publication of CA2278188C publication Critical patent/CA2278188C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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.
CA002278188A 1997-01-21 1998-01-19 Oxygen delignification process of pulp Expired - Fee Related CA2278188C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US78621697A 1997-01-21 1997-01-21
US08/786,216 1997-01-21
PCT/CA1998/000020 WO1998031872A1 (en) 1997-01-21 1998-01-19 Oxygen delignification process of pulp

Publications (2)

Publication Number Publication Date
CA2278188A1 true CA2278188A1 (en) 1998-07-23
CA2278188C CA2278188C (en) 2003-11-25

Family

ID=25137931

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002278188A Expired - Fee Related CA2278188C (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
US20180030651A1 (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
SE9402726L (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
CA2278188C (en) 2003-11-25
ATE216741T1 (en) 2002-05-15
DE69805056D1 (en) 2002-05-29
DE69805056T2 (en) 2002-11-14
AU5546498A (en) 1998-08-07
WO1998031872A1 (en) 1998-07-23
EP0960235B1 (en) 2002-04-24
EP0960235A1 (en) 1999-12-01

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