ZA928294B - Wash press modification for oxygen delignification process. - Google Patents

Wash press modification for oxygen delignification process.

Info

Publication number
ZA928294B
ZA928294B ZA928294A ZA928294A ZA928294B ZA 928294 B ZA928294 B ZA 928294B ZA 928294 A ZA928294 A ZA 928294A ZA 928294 A ZA928294 A ZA 928294A ZA 928294 B ZA928294 B ZA 928294B
Authority
ZA
South Africa
Prior art keywords
pulp
wash press
consistency
oxygen delignification
alkaline material
Prior art date
Application number
ZA928294A
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 ZA928294B publication Critical patent/ZA928294B/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)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (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.
ZA928294A 1991-10-29 1992-10-27 Wash press modification for oxygen delignification process. ZA928294B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ZA928294B true ZA928294B (en) 1993-05-18

Family

ID=25131607

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA928294A ZA928294B (en) 1991-10-29 1992-10-27 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
CA2282849C (en) 1997-03-07 2004-07-13 Akzo Nobel N.V. Process for treating wastewater
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
CA2802237C (en) 2010-06-10 2018-02-13 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
SE9203113D0 (en) 1992-10-23
AU2716892A (en) 1993-05-20
CN1080343A (en) 1994-01-05
NZ244837A (en) 1994-10-26
JPH05195466A (en) 1993-08-03
EP0540091B1 (en) 1997-01-15
ATE147808T1 (en) 1997-02-15
DE69216757D1 (en) 1997-02-27
NO924080L (en) 1993-04-30
FI924751A0 (en) 1992-10-20
FI924751A (en) 1993-04-30
CA2081398C (en) 1997-03-25
CA2081398A1 (en) 1993-04-30
KR960006125B1 (en) 1996-05-09
BR9204173A (en) 1993-05-04
AU647973B2 (en) 1994-03-31
KR930008238A (en) 1993-05-21
EP0540091A1 (en) 1993-05-05
SE9203113L (en) 1993-04-30
NO924080D0 (en) 1992-10-21

Similar Documents

Publication Publication Date Title
US4576609A (en) Process for the treatment of cellulosic materials with oxidizing agents and microwaves
AU592488B2 (en) A method for stabilising the brightness of bleached lignin containing cellulose pulp
NO180495C (en) Process of delignification and bleaching of chemically suspended lignocellulosic material
DE3061330D1 (en) Process for the delignification and bleaching of chemical and semichemical cellulose pulps
FI923934A0 (en) UPPDELAD TILLSATS AV ALKALI FOER HOEGKONSISTENSSYREDELIGNIFIERING.
SE9202338D0 (en) USE OF WASH PRESS FOR PULP ALKALI ADDITION PROCESS
ZA928294B (en) Wash press modification for oxygen delignification process.
CA1173604A (en) Production of chemimechanical pulp
US5525195A (en) Process for high consistency delignification using a low consistency alkali pretreatment
CA2069447A1 (en) Pulp Alkali Addition Process for High Consistency Oxygen Delignification
WO1992020855A1 (en) A method for the manufacture of chemithermomechanical pulp
KR930701654A (en) How alkali is added to the pulp to provide high hardness oxygen delignification
RU92016575A (en) A METHOD OF ACHIEVING AN IMPROVED DELHINIFICATION SELECTIVITY OF UNCLEARED FIBROUS WEIGHT
RU92004578A (en) METHOD OF INTENSIFIED ELECTORAL OXYGEN DELIGNIFICATION OF HIGHLY-SUSTAINABLE SUSPENSION OF WOOD-BODY MASS
TH31376A (en) Process for chemical pulp production