FI924751A - TVAETTPRESSMODIFIKATION FOER EN SYREDELIGNIFIERINGSMETOD - Google Patents

TVAETTPRESSMODIFIKATION FOER EN SYREDELIGNIFIERINGSMETOD Download PDF

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Publication number
FI924751A
FI924751A FI924751A FI924751A FI924751A FI 924751 A FI924751 A FI 924751A FI 924751 A FI924751 A FI 924751A FI 924751 A FI924751 A FI 924751A FI 924751 A FI924751 A FI 924751A
Authority
FI
Finland
Prior art keywords
pulp
consistency
alkaline material
wash press
oxygen
Prior art date
Application number
FI924751A
Other languages
Finnish (fi)
Other versions
FI924751A0 (en
Inventor
William H Friend
Stuart T Terrett
Spencer W Eachus
Bruce F Griggs
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 FI924751A0 publication Critical patent/FI924751A0/en
Publication of FI924751A publication Critical patent/FI924751A/en

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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)
  • Television Systems (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Gas Separation By Absorption (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.
FI924751A 1991-10-29 1992-10-20 TVAETTPRESSMODIFIKATION FOER EN SYREDELIGNIFIERINGSMETOD FI924751A (en)

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
FI924751A0 FI924751A0 (en) 1992-10-20
FI924751A true FI924751A (en) 1993-04-30

Family

ID=25131607

Family Applications (1)

Application Number Title Priority Date Filing Date
FI924751A FI924751A (en) 1991-10-29 1992-10-20 TVAETTPRESSMODIFIKATION FOER EN SYREDELIGNIFIERINGSMETOD

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
US6425974B1 (en) 1997-03-07 2002-07-30 Akzo Nobel N.V. Process for treating wastewater from a bleach plant
EP0863113A1 (en) * 1997-03-07 1998-09-09 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
BR8605554A (en) * 1985-02-14 1987-04-22 Edward Francis Elton PROCESS FOR THE PRODUCTION OF PAPER AND APPARATUS FOR THE ALKALINE DESIGNIFICATION OF LIGNO-CELLULOSIC FIBROUS MATERIALS
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
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
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
BR9204173A (en) 1993-05-04
EP0540091B1 (en) 1997-01-15
EP0540091A1 (en) 1993-05-05
CN1080343A (en) 1994-01-05
KR960006125B1 (en) 1996-05-09
CA2081398C (en) 1997-03-25
DE69216757D1 (en) 1997-02-27
NO924080D0 (en) 1992-10-21
NO924080L (en) 1993-04-30
SE9203113L (en) 1993-04-30
NZ244837A (en) 1994-10-26
FI924751A0 (en) 1992-10-20
ATE147808T1 (en) 1997-02-15
ZA928294B (en) 1993-05-18
AU2716892A (en) 1993-05-20
SE9203113D0 (en) 1992-10-23
KR930008238A (en) 1993-05-21
AU647973B2 (en) 1994-03-31
JPH05195466A (en) 1993-08-03
CA2081398A1 (en) 1993-04-30

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Legal Events

Date Code Title Description
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