SE9202338D0 - USE OF WASH PRESS FOR PULP ALKALI ADDITION PROCESS - Google Patents

USE OF WASH PRESS FOR PULP ALKALI ADDITION PROCESS

Info

Publication number
SE9202338D0
SE9202338D0 SE9202338A SE9202338A SE9202338D0 SE 9202338 D0 SE9202338 D0 SE 9202338D0 SE 9202338 A SE9202338 A SE 9202338A SE 9202338 A SE9202338 A SE 9202338A SE 9202338 D0 SE9202338 D0 SE 9202338D0
Authority
SE
Sweden
Prior art keywords
pulp
consistency
addition process
oxygen
alkaline material
Prior art date
Application number
SE9202338A
Other languages
Swedish (sv)
Other versions
SE9202338L (en
Inventor
J C Joseph
Original Assignee
Union Camp Patent Holding
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 Union Camp Patent Holding filed Critical Union Camp Patent Holding
Publication of SE9202338D0 publication Critical patent/SE9202338D0/en
Publication of SE9202338L publication Critical patent/SE9202338L/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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency (9) to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The consistency of the pulp is then increased (12) to above about 18%, and the high consistency alkali containing pulp is then treated with oxygen (21) to effect delignification (20). Additional alkali may be applied onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7% by weight of oven dry pulp. The invention contemplates the use of one or more wash presses (7,30) for reducing the overall amounts of alkaline material utilized in the process. High strength, low lignin pulps (25) are subsequently formed which may be further bleached to high brightness with reduced amounts of chemicals by following the methods of the invention. <IMAGE>
SE9202338A 1991-08-14 1992-08-12 APPLICATION OF CLEANING PRESSURE FOR APPLICATION OF ALKALI IN A MASSING PROCESS SE9202338L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74822291A 1991-08-14 1991-08-14

Publications (2)

Publication Number Publication Date
SE9202338D0 true SE9202338D0 (en) 1992-08-12
SE9202338L SE9202338L (en) 1993-02-15

Family

ID=25008524

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9202338A SE9202338L (en) 1991-08-14 1992-08-12 APPLICATION OF CLEANING PRESSURE FOR APPLICATION OF ALKALI IN A MASSING PROCESS

Country Status (11)

Country Link
EP (1) EP0530881A1 (en)
JP (1) JPH0726350B2 (en)
KR (1) KR950013196B1 (en)
CN (1) CN1070969A (en)
AU (1) AU647950B2 (en)
BR (1) BR9203170A (en)
CA (1) CA2075875A1 (en)
FI (1) FI923585A (en)
NO (1) NO923163L (en)
SE (1) SE9202338L (en)
ZA (1) ZA926092B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2311718A1 (en) * 1999-06-14 2000-12-14 Praxair Technology, Inc. Oxygen delignification of lignocellulosic material
FI122241B (en) * 2007-06-15 2011-10-31 Andritz Oy Procedure in connection with pulp washing at a pulp mill
US9932709B2 (en) 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production
FI20115754A0 (en) * 2011-03-22 2011-07-15 Andritz Oy Process and arrangement for the treatment of chemical pulp
BR112015018492A2 (en) * 2013-02-08 2017-07-18 Gp Cellulose Gmbh kraft fiber and method for making oxidized kraft pulp
WO2018022427A1 (en) * 2016-07-27 2018-02-01 Ecolab USA, Inc. Method and compositions for oxygen delignification of chemical pulp
SE544255C2 (en) * 2020-09-03 2022-03-15 Valmet Oy System for producing cellulose pulp and method for controlling such a system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0211945A4 (en) * 1985-02-14 1987-07-06 Edward Francis Elton Method and apparatus for alkaline delignification of lignocellulosic fibrous materials.
US5179021A (en) * 1989-02-10 1993-01-12 Gil Inc. (Now Ici Canada Inc.) Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment
US5173153A (en) * 1991-01-03 1992-12-22 Union Camp Patent Holding, Inc. Process for enhanced oxygen delignification using high consistency and a split alkali addition
US5085734A (en) * 1989-02-15 1992-02-04 Union Camp Patent Holding, Inc. Methods of high consistency oxygen delignification using a low consistency alkali pretreatment
CA2069447C (en) * 1991-04-18 1996-08-27 Bruce F. Griggs Pulp alkali addition process for high consistency oxygen delignification

Also Published As

Publication number Publication date
EP0530881A1 (en) 1993-03-10
FI923585A0 (en) 1992-08-11
BR9203170A (en) 1993-03-30
ZA926092B (en) 1993-03-02
CA2075875A1 (en) 1993-02-15
FI923585A (en) 1993-02-15
JPH05195461A (en) 1993-08-03
AU2095492A (en) 1993-02-25
NO923163L (en) 1993-02-15
JPH0726350B2 (en) 1995-03-22
CN1070969A (en) 1993-04-14
KR930004578A (en) 1993-03-22
SE9202338L (en) 1993-02-15
NO923163D0 (en) 1992-08-13
KR950013196B1 (en) 1995-10-25
AU647950B2 (en) 1994-03-31

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