DE69805056D1 - DELIGNIFICATION OF CELLULAR WITH OXYGEN - Google Patents

DELIGNIFICATION OF CELLULAR WITH OXYGEN

Info

Publication number
DE69805056D1
DE69805056D1 DE69805056T DE69805056T DE69805056D1 DE 69805056 D1 DE69805056 D1 DE 69805056D1 DE 69805056 T DE69805056 T DE 69805056T DE 69805056 T DE69805056 T DE 69805056T DE 69805056 D1 DE69805056 D1 DE 69805056D1
Authority
DE
Germany
Prior art keywords
oxygen
stage
reducing agent
delignification
pulp
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.)
Expired - Fee Related
Application number
DE69805056T
Other languages
German (de)
Other versions
DE69805056T2 (en
Inventor
Yonghao Ni
Heiningen R Van
Jun Kang
Anastasios Skothos
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
Application granted granted Critical
Publication of DE69805056D1 publication Critical patent/DE69805056D1/en
Publication of DE69805056T2 publication Critical patent/DE69805056T2/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.
DE69805056T 1997-01-21 1998-01-19 DELIGNIFICATION OF CELLULAR WITH OXYGEN Expired - Fee Related DE69805056T2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78621697A 1997-01-21 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
DE69805056D1 true DE69805056D1 (en) 2002-05-29
DE69805056T2 DE69805056T2 (en) 2002-11-14

Family

ID=25137931

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69805056T Expired - Fee Related DE69805056T2 (en) 1997-01-21 1998-01-19 DELIGNIFICATION OF CELLULAR WITH OXYGEN

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
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
DE69805056T2 (en) 2002-11-14
AU5546498A (en) 1998-08-07
EP0960235B1 (en) 2002-04-24
ATE216741T1 (en) 2002-05-15
EP0960235A1 (en) 1999-12-01
WO1998031872A1 (en) 1998-07-23
CA2278188A1 (en) 1998-07-23
CA2278188C (en) 2003-11-25

Similar Documents

Publication Publication Date Title
AU560277B2 (en) Bleaching cellulose with oxidising agents and microwaves
AU3404099A (en) Method of producing lignocellulosic pulp from non-woody species
SE8504236L (en) IMPROVE OXIDATIVE EXTRACTION
BR9507286A (en) Process for the production of targeted cellulosic pulp
SE8904313D0 (en) VAETEPEROXID-BLEACHING PROCESS
CA2082185C (en) Protease catalyzed treatments of lignocellulose materials
CA2169108A1 (en) Continuous cooking with white liquor pretreatment
DE69805056T2 (en) DELIGNIFICATION OF CELLULAR WITH OXYGEN
BR9204097A (en) PROCESS TO OBTAIN IMPROVED, SELECTIVITY OF DESIGNIFICATION OF PULP DURING DESIGNIFICATION WITH OXYGEN, OF HIGH CONSISTENCY
SE9700992D0 (en) Method of bleaching kraft pulp
SE0004438D0 (en) Enviormentally-friendly fiber line for producing bleached chemical pulp
MY102502A (en) A process for the manufature of cellulose pulps
NZ216726A (en) Use of lignin-degrading enzymes from phanerochaete chrysosporium for treatment of wood pulp and e1 effluent
SE9702583L (en) Process for mass production
SE8604852D0 (en) DELIGNIFICATION AND BLEACHING OF A CELLULOSE PULP WITH AN ALKALI-OXYGEN HYPOCHLORITE EXTRACTION
ATE483058T1 (en) COOKING OF PULP IN A COOKING LYE CONTAINING PRE-evaporated black liquor
NO924080L (en) WASHING PRESSURE FOR OXYGEN DELIGNIFICATION
ZA991036B (en) Pulping process.
DE59504281D1 (en) SULFIT Digestion Process
EP1462524A4 (en) Cellulase preparations containing reducing agent and method of processing fiber
TH29889A (en) Pulp bleaching method
SE9604217D0 (en) Method and apparatus for delignifying chemical pu lp
PT83751B (en) APPROPRIATE PROCESS FOR THE LENGTHENING AND BLEEDING OF A PULP OF CELLULOSE, WITH AN ALKALINE EXTRACTION IN THE PRESENCE OF OXYGEN AND HYPOCHLORITE
RS49842B (en) Cooking process for producing cellulose with b-constant based on a mathematical model

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee