FI106215B - Blekning av kemisk massa - Google Patents
Blekning av kemisk massa Download PDFInfo
- 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
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)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Nonmetallic Welding Materials (AREA)
- Lubricants (AREA)
- Saccharide Compounds (AREA)
- Coloring Foods And Improving Nutritive Qualities (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.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9001548A SE466062B (sv) | 1990-04-30 | 1990-04-30 | Blekning av kemisk massa |
SE9001548 | 1990-04-30 | ||
SE9100178 | 1991-03-07 | ||
PCT/SE1991/000178 WO1991017306A1 (en) | 1990-04-30 | 1991-03-07 | Bleaching of chemical pulp |
Publications (3)
Publication Number | Publication Date |
---|---|
FI924889A0 FI924889A0 (fi) | 1992-10-28 |
FI924889A FI924889A (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)
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)
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 |
-
1990
- 1990-04-30 SE SE9001548A patent/SE466062B/sv not_active IP Right Cessation
-
1991
- 1991-03-07 JP JP91507954A patent/JPH05506698A/ja active Pending
- 1991-03-07 CA CA002080242A patent/CA2080242A1/en not_active Abandoned
- 1991-03-07 EP EP91908393A patent/EP0527808B1/en not_active Expired - Lifetime
- 1991-03-07 AT AT91908393T patent/ATE106962T1/de not_active IP Right Cessation
- 1991-03-07 ES ES91908393T patent/ES2055602T3/es not_active Expired - Lifetime
- 1991-03-07 BR BR919106390A patent/BR9106390A/pt not_active Application Discontinuation
- 1991-03-07 DE DE69102430T patent/DE69102430T2/de not_active Expired - Fee Related
- 1991-03-07 AU AU77427/91A patent/AU639335B2/en not_active Ceased
- 1991-03-07 US US07/930,665 patent/US5589031A/en not_active Expired - Fee Related
- 1991-03-07 WO PCT/SE1991/000178 patent/WO1991017306A1/en active IP Right Grant
- 1991-03-21 NZ NZ237528A patent/NZ237528A/xx unknown
- 1991-04-04 ZA ZA912504A patent/ZA912504B/xx unknown
- 1991-04-30 PT PT97537A patent/PT97537B/pt not_active IP Right Cessation
-
1992
- 1992-10-28 FI FI924889A patent/FI106215B/sv active
- 1992-10-29 NO NO924182A patent/NO179417C/no unknown
Also Published As
Publication number | Publication date |
---|---|
NO924182D0 (no) | 1992-10-29 |
PT97537A (pt) | 1992-01-31 |
JPH05506698A (ja) | 1993-09-30 |
BR9106390A (pt) | 1993-04-27 |
EP0527808B1 (en) | 1994-06-08 |
AU639335B2 (en) | 1993-07-22 |
ES2055602T3 (es) | 1994-08-16 |
SE9001548L (sv) | 1991-10-31 |
CA2080242A1 (en) | 1991-10-31 |
PT97537B (pt) | 1998-08-31 |
EP0527808A1 (en) | 1993-02-24 |
NO924182L (no) | 1992-10-29 |
US5589031A (en) | 1996-12-31 |
SE466062B (sv) | 1991-12-09 |
AU7742791A (en) | 1991-11-27 |
DE69102430T2 (de) | 1994-09-29 |
NO179417C (no) | 1996-10-02 |
WO1991017306A1 (en) | 1991-11-14 |
NZ237528A (en) | 1993-06-25 |
DE69102430D1 (de) | 1994-07-14 |
ZA912504B (en) | 1992-01-29 |
NO179417B (no) | 1996-06-24 |
FI924889A0 (fi) | 1992-10-28 |
FI924889A (fi) | 1992-10-28 |
SE9001548D0 (sv) | 1990-04-30 |
ATE106962T1 (de) | 1994-06-15 |
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