FI106215B - Blekning av kemisk massa - Google Patents

Blekning av kemisk massa Download PDF

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Publication number
FI106215B
FI106215B FI924889A FI924889A FI106215B FI 106215 B FI106215 B FI 106215B FI 924889 A FI924889 A FI 924889A FI 924889 A FI924889 A FI 924889A FI 106215 B FI106215 B FI 106215B
Authority
FI
Finland
Prior art keywords
pulp
chlorine dioxide
bleaching
amount
ton
Prior art date
Application number
FI924889A
Other languages
English (en)
Finnish (fi)
Other versions
FI924889A (fi
FI924889A0 (fi
Inventor
Lars-Aake Lindstroem
Per-Aake Faernstrand
Lars T Sjoedin
K Solveig E Norden
Original Assignee
Valmet Fibertech 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 Valmet Fibertech Ab filed Critical Valmet Fibertech Ab
Publication of FI924889A publication Critical patent/FI924889A/fi
Publication of FI924889A0 publication Critical patent/FI924889A0/fi
Application granted granted Critical
Publication of FI106215B publication Critical patent/FI106215B/sv

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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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
    • 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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Lubricants (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
  • Saccharide Compounds (AREA)

Claims (4)

1. Sätt för blekning av kemisk massa i en sekvens omfat-tande ätminstone fyra bleksteg varvid sekvensen innefattar slutblekning i ett första och ett andra klordioxidsteg med 5 mellanliggande alkalisk extraktion där tvättning av massan sker mellan det första klordioxidsteget och extraktionen kännetecknat av a) att NAOH i en mängd av 4-10 kg/ton massa satsas ome-delbart efter nämnda tvättning; 10 b) att ett oxidationsmedel i form av syrgas och/eller väteperoxid därefter inblandas i massan i en mängd av högst 2 kg/ton massa vardera, varvid ett tryck av 0,1-1,0 MPa och en temperatur av 60-90°C upprätthälls; c) att en syra tillsätts efter 15-120 sek räknat frän 15 syrgas- och/eller väteperoxidsatsningen för avslutning av behandlingen med syrgas och/eller väteperoxid och för sänkning av pH-värdet men utan att ästadkomma en fullstän-dig neutralisering av restalkali. 20
2. Sätt enligt patentkravet 1, kännetecknat ... av att mängden syra per ton massa tillsatt enligt moment • « « .* . c) uttryckt i vätejoner högst uppgär tili • · i • « · • · • * • · · ^ . *·’· H = NaOH - 2 kmol H per ton massa ...’25 40 • · ♦ ♦ · • · · • · • ·· i där NAOH är satsad mängd alkali uttryckt i kg NAOH per ton massa. ··· • · · • · · .*:*30
3. Sätt enligt patentkravet 1 eller 2, känneteck- n a t av att syran tillsätts omedelbart före eller tillsam- • * · *·* * mans med klordioxiden i det andra klordioxidsteget. • · · • · • * • · ·
4. Sätt enligt nägot av föregäende patentkrav, k ä n n e -.•••35 tecknatav att väteperoxidsatsningen enligt moment b) uppgär tili högst 1 kg/ton massa.
FI924889A 1990-04-30 1992-10-28 Blekning av kemisk massa FI106215B (sv)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9001548 1990-04-30
SE9001548A SE466062B (sv) 1990-04-30 1990-04-30 Blekning av kemisk massa
PCT/SE1991/000178 WO1991017306A1 (en) 1990-04-30 1991-03-07 Bleaching of chemical pulp
SE9100178 1991-03-07

Publications (3)

Publication Number Publication Date
FI924889A FI924889A (fi) 1992-10-28
FI924889A0 FI924889A0 (fi) 1992-10-28
FI106215B true FI106215B (sv) 2000-12-15

Family

ID=20379338

Family Applications (1)

Application Number Title Priority Date Filing Date
FI924889A FI106215B (sv) 1990-04-30 1992-10-28 Blekning av kemisk massa

Country Status (16)

Country Link
US (1) US5589031A (sv)
EP (1) EP0527808B1 (sv)
JP (1) JPH05506698A (sv)
AT (1) ATE106962T1 (sv)
AU (1) AU639335B2 (sv)
BR (1) BR9106390A (sv)
CA (1) CA2080242A1 (sv)
DE (1) DE69102430T2 (sv)
ES (1) ES2055602T3 (sv)
FI (1) FI106215B (sv)
NO (1) NO179417C (sv)
NZ (1) NZ237528A (sv)
PT (1) PT97537B (sv)
SE (1) SE466062B (sv)
WO (1) WO1991017306A1 (sv)
ZA (1) ZA912504B (sv)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322768B1 (en) 1998-09-29 2001-11-27 International Paper Company Recovery of chlorine dioxide from gas streams
SE518692C2 (sv) * 2001-03-20 2002-11-05 Metso Paper Inc Blekning av massa med klordioxid
SE532370C2 (sv) 2008-02-28 2009-12-29 Metso Paper Inc Metod för blekning av en massa

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432574A1 (fr) * 1978-08-01 1980-02-29 Europeen Cellulose Procede de blanchiment de pate a papier
SE462919B (sv) * 1979-05-11 1990-09-17 Sunds Defibrator Ind Ab Saett att genomfoera alkaliextraktion av cellulosamassa i naervaro av syre
US4568420B1 (en) * 1984-12-03 1999-03-02 Int Paper Co Multi-stage bleaching process including an enhanced oxidative extraction stage
US4657633A (en) * 1985-05-24 1987-04-14 Westvaco Corporation Delignification and bleaching of a cellulose pulp with an alkalioxygen-hypochlorite single stage sequential extraction

Also Published As

Publication number Publication date
FI924889A (fi) 1992-10-28
AU7742791A (en) 1991-11-27
NO924182L (no) 1992-10-29
WO1991017306A1 (en) 1991-11-14
DE69102430D1 (de) 1994-07-14
NO179417B (no) 1996-06-24
NO924182D0 (no) 1992-10-29
NO179417C (no) 1996-10-02
DE69102430T2 (de) 1994-09-29
SE9001548D0 (sv) 1990-04-30
SE466062B (sv) 1991-12-09
PT97537B (pt) 1998-08-31
NZ237528A (en) 1993-06-25
ZA912504B (en) 1992-01-29
EP0527808B1 (en) 1994-06-08
US5589031A (en) 1996-12-31
BR9106390A (pt) 1993-04-27
FI924889A0 (fi) 1992-10-28
ATE106962T1 (de) 1994-06-15
AU639335B2 (en) 1993-07-22
PT97537A (pt) 1992-01-31
CA2080242A1 (en) 1991-10-31
JPH05506698A (ja) 1993-09-30
ES2055602T3 (es) 1994-08-16
SE9001548L (sv) 1991-10-31
EP0527808A1 (en) 1993-02-24

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