CA920753A - Delignification and bleaching of chemical and semi-chemical cellulosic pulp - Google Patents

Delignification and bleaching of chemical and semi-chemical cellulosic pulp

Info

Publication number
CA920753A
CA920753A CA095377A CA95377A CA920753A CA 920753 A CA920753 A CA 920753A CA 095377 A CA095377 A CA 095377A CA 95377 A CA95377 A CA 95377A CA 920753 A CA920753 A CA 920753A
Authority
CA
Canada
Prior art keywords
chemical
delignification
bleaching
semi
cellulosic pulp
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.)
Expired
Application number
CA095377A
Inventor
Smith Leon
H. Myburgh Henry
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.)
SOUTH AFRICAN PULP AND PAPER INDUSTRIES Ltd
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
SOUTH AFRICAN PULP AND PAPER INDUSTRIES Ltd
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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 SOUTH AFRICAN PULP AND PAPER INDUSTRIES Ltd, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical SOUTH AFRICAN PULP AND PAPER INDUSTRIES Ltd
Application granted granted Critical
Publication of CA920753A publication Critical patent/CA920753A/en
Expired 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
CA095377A 1969-10-15 1970-10-13 Delignification and bleaching of chemical and semi-chemical cellulosic pulp Expired CA920753A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA697269A ZA697269B (en) 1969-10-15 1969-10-15 Improvements in or relating to the delignification and bleaching of cellulose pulp with oxygen gas

Publications (1)

Publication Number Publication Date
CA920753A true CA920753A (en) 1973-02-13

Family

ID=25561489

Family Applications (1)

Application Number Title Priority Date Filing Date
CA095377A Expired CA920753A (en) 1969-10-15 1970-10-13 Delignification and bleaching of chemical and semi-chemical cellulosic pulp

Country Status (6)

Country Link
US (1) US3740310A (en)
JP (1) JPS4923241B1 (en)
CA (1) CA920753A (en)
FR (1) FR2065935A5 (en)
SE (1) SE356084B (en)
ZA (1) ZA697269B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002526A (en) * 1975-10-10 1977-01-11 International Paper Company Oxygen-alkali delignification of low consistency wood pulp
US4338158A (en) * 1976-04-09 1982-07-06 Weyerhaeuser Company Pulping in the presence of a protector
US5525195A (en) * 1989-02-15 1996-06-11 Union Camp Patent Holding, Inc. Process for high consistency 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
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
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5217574A (en) * 1989-02-15 1993-06-08 Union Camp Patent Holdings Inc. Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp
US5188708A (en) * 1989-02-15 1993-02-23 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification followed by ozone relignification
US5164043A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5164044A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration

Also Published As

Publication number Publication date
US3740310A (en) 1973-06-19
SE356084B (en) 1973-05-14
ZA697269B (en) 1971-04-28
JPS4923241B1 (en) 1974-06-14
FR2065935A5 (en) 1971-08-06

Similar Documents

Publication Publication Date Title
CA902861A (en) Bleaching of cellulosic pulp
CA944201A (en) Method and device for bleaching of cellulosic pulp
AU497459B2 (en) Continuous bleaching and delignifying of cellulose pulp
FR1387853A (en) Delignification and bleaching of chemical and semi-chemical cellulose pulps
CA929713A (en) Decolorization of kraft wood pulp bleach effluents
CA966604A (en) Kraft pulp bleaching and recovery process
CA920753A (en) Delignification and bleaching of chemical and semi-chemical cellulosic pulp
CA943707A (en) Delignification of chemical cellulosic pulp
CA933307A (en) Lignin-preserving bleaching of cellulose pulp
NZ183120A (en) Peroxide bleaching of cellulose pulp
CA743847A (en) Delignification and bleaching of chemical and semichemical cellulose pulps
CA869267A (en) Process of and apparatus for the bleaching of fibrous cellulosic pulp
CA877202A (en) Delignification and bleaching of cellulose pulp
CA694720A (en) Method of bleaching cellulosic pulps
CA779176A (en) Bleaching of cellulosic pulp
CA975111A (en) Bleaching cellulosic pulp
AU442870B2 (en) Improvements in or relating tothe delignification and bleaching of cellulose pulp
CA792160A (en) Bleaching of cellulose pulp
AU5644469A (en) Improvements in or relating tothe delignification and bleaching of cellulose pulp
AU461389B2 (en) Bleaching of cellulosic pulp
CA810646A (en) Process and apparatus for the preparation of chemicals for kraft pulping and bleaching
CA899005A (en) Bleaching of cellulosic pulp
CA773988A (en) Delignification of chemical cellulose pulps
CA885903A (en) Oxygen bleaching and delignification of alkaline pulp
CA833881A (en) Cellulose bleaching plant and method of bleaching cellulosic pulp