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NO924080L - WASHING PRESSURE FOR OXYGEN DELIGNIFICATION - Google Patents

WASHING PRESSURE FOR OXYGEN DELIGNIFICATION

Info

Publication number
NO924080L
NO924080L NO92924080A NO924080A NO924080L NO 924080 L NO924080 L NO 924080L NO 92924080 A NO92924080 A NO 92924080A NO 924080 A NO924080 A NO 924080A NO 924080 L NO924080 L NO 924080L
Authority
NO
Norway
Prior art keywords
pulp
oxygen
consistency
alkaline material
washing press
Prior art date
Application number
NO92924080A
Other languages
Norwegian (no)
Other versions
NO924080D0 (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 NO924080D0 publication Critical patent/NO924080D0/en
Publication of NO924080L publication Critical patent/NO924080L/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
    • 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)
  • Gas Separation By Absorption (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Detergent Compositions (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

Ubleket masse (12) vaskes med en alkalisk løsning (14) l en vaskepresse (13) for hovedsaklig å fordele en første mengde alkalisk materiale Jevnt l massen. Konsistensen til massen som kommer ut av vaskepressen (13) er over ca. 18*. fortrinnsvis mellom 25til 35 masse-# og den høykonslstens alkallholdlge massen (15) blir deretter behandlet med oksygen (22) for å frembringe delignifiserlng (21). Bruk av en vaskepres- se (13) reduserer de totale mengdene alkalisk materiale som anvendes i prosessen, sammenlignet med prosesser som tilfører alkalisk materiale til massen ved lavkonsistens. Ytterligere alkali (20) kan tilsettes, om ønskelig, til høykonsistensmassen (15) før oksygen- delignifiserlngen (21) og gir en total mengde på mellom 0.8 og 7 masse-& av ovnstørket masse. Det dannes masse (23) med høy styrke og lavt ligninlnnhold etter oksygendelignlfIserlngen som deretter kan blekes til høy lyshet med reduserte mengder blekekjemikalier.Unbleached pulp (12) is washed with an alkaline solution (14) in a washing press (13) to distribute substantially a first amount of alkaline material evenly in the pulp. The consistency of the pulp coming out of the washing press (13) is over approx. 18 *. preferably between 25 to 35 pulp and the high-grade alkali-containing pulp (15) is then treated with oxygen (22) to produce delignification (21). The use of a washing press (13) reduces the total amounts of alkaline material used in the process, compared to processes which supply alkaline material to the pulp at low consistency. Additional alkali (20) can be added, if desired, to the high consistency mass (15) prior to oxygen delignification (21), giving a total amount of between 0.8 and 7 pulp & oven dried pulp. Pulp (23) is formed with high strength and low lignin content after oxygen leaching, which can then be bleached to high brightness with reduced amounts of bleaching chemicals.

NO92924080A 1991-10-29 1992-10-21 WASHING PRESSURE FOR OXYGEN DELIGNIFICATION NO924080L (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
NO924080D0 NO924080D0 (en) 1992-10-21
NO924080L true NO924080L (en) 1993-04-30

Family

ID=25131607

Family Applications (1)

Application Number Title Priority Date Filing Date
NO92924080A NO924080L (en) 1991-10-29 1992-10-21 WASHING PRESSURE FOR OXYGEN DELIGNIFICATION

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) FI924751A7 (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
AU6641498A (en) 1997-03-07 1998-09-22 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
FI864154A7 (en) * 1985-02-14 1986-10-14 Edward Francis Elton Method and apparatus for alkaline removal of lignin from fibrous materials comprising lignocellulose.
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
CA2081398C (en) 1997-03-25
SE9203113D0 (en) 1992-10-23
FI924751A0 (en) 1992-10-20
JPH05195466A (en) 1993-08-03
BR9204173A (en) 1993-05-04
EP0540091B1 (en) 1997-01-15
AU2716892A (en) 1993-05-20
NO924080D0 (en) 1992-10-21
CN1080343A (en) 1994-01-05
DE69216757D1 (en) 1997-02-27
ZA928294B (en) 1993-05-18
NZ244837A (en) 1994-10-26
EP0540091A1 (en) 1993-05-05
ATE147808T1 (en) 1997-02-15
KR960006125B1 (en) 1996-05-09
FI924751A7 (en) 1993-04-30
SE9203113L (en) 1993-04-30
CA2081398A1 (en) 1993-04-30
AU647973B2 (en) 1994-03-31
KR930008238A (en) 1993-05-21

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