SE8704041D0 - VIEW ON WHITE CELLULOSAMASSA - Google Patents

VIEW ON WHITE CELLULOSAMASSA

Info

Publication number
SE8704041D0
SE8704041D0 SE8704041A SE8704041A SE8704041D0 SE 8704041 D0 SE8704041 D0 SE 8704041D0 SE 8704041 A SE8704041 A SE 8704041A SE 8704041 A SE8704041 A SE 8704041A SE 8704041 D0 SE8704041 D0 SE 8704041D0
Authority
SE
Sweden
Prior art keywords
pulp
cellulosamassa
white
view
sulphide
Prior art date
Application number
SE8704041A
Other languages
Swedish (sv)
Other versions
SE8704041L (en
Original Assignee
Sca Development Ab
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 Sca Development Ab filed Critical Sca Development Ab
Priority to SE8704041A priority Critical patent/SE8704041L/en
Publication of SE8704041D0 publication Critical patent/SE8704041D0/en
Priority to PCT/SE1988/000418 priority patent/WO1989003451A1/en
Priority to AU24804/88A priority patent/AU2480488A/en
Priority to FR8813166A priority patent/FR2621934A1/en
Publication of SE8704041L publication Critical patent/SE8704041L/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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Paper (AREA)

Abstract

The invention relates to a method at the manufacture of chemical cellulose pulp by treating the pulp with a reducing agent in alkalic environment. It is desired to be able to drive the delignification as far as possible before the final bleaching without carbohydrate attack. According to the invention, this is achieved in that the pulp in a special step is treated with a sulphide, for example sodium sulphide and/or polysulphide, in alkalic environment.
SE8704041A 1987-10-16 1987-10-16 SEATED WHITE CELLULOSAMASSA WHITE SE8704041L (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE8704041A SE8704041L (en) 1987-10-16 1987-10-16 SEATED WHITE CELLULOSAMASSA WHITE
PCT/SE1988/000418 WO1989003451A1 (en) 1987-10-16 1988-08-17 Method at bleaching cellulose pulp
AU24804/88A AU2480488A (en) 1987-10-16 1988-08-17 Method at bleaching cellulose pulp
FR8813166A FR2621934A1 (en) 1987-10-16 1988-10-07 PROCESS FOR BLEACHING CELLULOSE PASTE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8704041A SE8704041L (en) 1987-10-16 1987-10-16 SEATED WHITE CELLULOSAMASSA WHITE

Publications (2)

Publication Number Publication Date
SE8704041D0 true SE8704041D0 (en) 1987-10-16
SE8704041L SE8704041L (en) 1989-04-17

Family

ID=20369912

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8704041A SE8704041L (en) 1987-10-16 1987-10-16 SEATED WHITE CELLULOSAMASSA WHITE

Country Status (4)

Country Link
AU (1) AU2480488A (en)
FR (1) FR2621934A1 (en)
SE (1) SE8704041L (en)
WO (1) WO1989003451A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1074111A (en) * 1964-04-02 1967-06-28 Electric Reduction Co Processes useful in the manufacture of bleached pulp
FI43947C (en) * 1965-01-25 1971-07-12 Electric Reduction Co Method for the production of bleached cellulose
US3716448A (en) * 1970-05-25 1973-02-13 Int Paper Co Single stage delignification and bleaching of chemical pulp with oxygen in the presence of a protector
US3798119A (en) * 1972-04-24 1974-03-19 Scott Paper Co Process for bleaching kraft pulp with oxygen in the presence of white liquor from a kraft recovery system
SE452483B (en) * 1985-02-01 1987-11-30 Aga Ab PROCEDURE FOR DELIGNIFICATION OF SULPHATE MASS
US4675076A (en) * 1986-10-01 1987-06-23 Ppg Industries, Inc. Method for brightening pulp

Also Published As

Publication number Publication date
FR2621934A1 (en) 1989-04-21
WO1989003451A1 (en) 1989-04-20
AU2480488A (en) 1989-05-02
SE8704041L (en) 1989-04-17

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