AU2716892A - Wash press modification for oxygen delignification process - Google Patents

Wash press modification for oxygen delignification process

Info

Publication number
AU2716892A
AU2716892A AU27168/92A AU2716892A AU2716892A AU 2716892 A AU2716892 A AU 2716892A AU 27168/92 A AU27168/92 A AU 27168/92A AU 2716892 A AU2716892 A AU 2716892A AU 2716892 A AU2716892 A AU 2716892A
Authority
AU
Australia
Prior art keywords
pulp
wash press
consistency
oxygen delignification
alkaline material
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
AU27168/92A
Other versions
AU647973B2 (en
Inventor
Spencer W. Eachus
William H. Friend
Bruce F Griggs
Stuart T. Terrett
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.)
Union Camp Patent Holding Inc
Original Assignee
Union Camp Patent Holding Inc
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 Inc filed Critical Union Camp Patent Holding Inc
Publication of AU2716892A publication Critical patent/AU2716892A/en
Application granted granted Critical
Publication of AU647973B2 publication Critical patent/AU647973B2/en
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Television Systems (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Gas Separation By Absorption (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)

Abstract

Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.
AU27168/92A 1991-10-29 1992-10-21 Wash press modification for oxygen delignification process Ceased AU647973B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US78418491A 1991-10-29 1991-10-29
US784184 1991-10-29

Publications (2)

Publication Number Publication Date
AU2716892A true AU2716892A (en) 1993-05-20
AU647973B2 AU647973B2 (en) 1994-03-31

Family

ID=25131607

Family Applications (1)

Application Number Title Priority Date Filing Date
AU27168/92A Ceased AU647973B2 (en) 1991-10-29 1992-10-21 Wash press modification for oxygen delignification process

Country Status (14)

Country Link
EP (1) EP0540091B1 (en)
JP (1) JPH05195466A (en)
KR (1) KR960006125B1 (en)
CN (1) CN1080343A (en)
AT (1) ATE147808T1 (en)
AU (1) AU647973B2 (en)
BR (1) BR9204173A (en)
CA (1) CA2081398C (en)
DE (1) DE69216757D1 (en)
FI (1) FI924751A (en)
NO (1) NO924080L (en)
NZ (1) NZ244837A (en)
SE (1) SE9203113L (en)
ZA (1) ZA928294B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0863113A1 (en) * 1997-03-07 1998-09-09 Akzo Nobel N.V. Process for treating wastewater
CA2282849C (en) 1997-03-07 2004-07-13 Akzo Nobel N.V. Process for treating wastewater
FI122241B (en) 2007-06-15 2011-10-31 Andritz Oy Procedure in connection with pulp washing at a pulp mill
WO2011156708A1 (en) * 2010-06-10 2011-12-15 Packaging Corporation Of America Method of manufacturing pulp for corrugated medium

Family Cites Families (4)

* 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.
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
JPH02289194A (en) * 1989-04-20 1990-11-29 Mitsubishi Paper Mills Ltd Method for bleaching lignocellulosic substance with oxygen

Also Published As

Publication number Publication date
FI924751A (en) 1993-04-30
NO924080D0 (en) 1992-10-21
SE9203113L (en) 1993-04-30
NZ244837A (en) 1994-10-26
EP0540091B1 (en) 1997-01-15
FI924751A0 (en) 1992-10-20
CN1080343A (en) 1994-01-05
BR9204173A (en) 1993-05-04
NO924080L (en) 1993-04-30
ZA928294B (en) 1993-05-18
KR930008238A (en) 1993-05-21
CA2081398C (en) 1997-03-25
AU647973B2 (en) 1994-03-31
DE69216757D1 (en) 1997-02-27
JPH05195466A (en) 1993-08-03
CA2081398A1 (en) 1993-04-30
KR960006125B1 (en) 1996-05-09
ATE147808T1 (en) 1997-02-15
SE9203113D0 (en) 1992-10-23
EP0540091A1 (en) 1993-05-05

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