FI96974B - Förfarande för blekning av lignocellulosahaltigt material - Google Patents
Förfarande för blekning av lignocellulosahaltigt material Download PDFInfo
- Publication number
- FI96974B FI96974B FI911908A FI911908A FI96974B FI 96974 B FI96974 B FI 96974B FI 911908 A FI911908 A FI 911908A FI 911908 A FI911908 A FI 911908A FI 96974 B FI96974 B FI 96974B
- Authority
- FI
- Finland
- Prior art keywords
- bleaching
- pulp
- treatment
- peroxide
- halogen
- Prior art date
Links
- 238000004061 bleaching Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000126 substance Substances 0.000 title claims description 32
- 150000002978 peroxides Chemical class 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000008139 complexing agent Substances 0.000 claims abstract description 21
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 16
- 150000002367 halogens Chemical class 0.000 claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 44
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 34
- 239000004155 Chlorine dioxide Substances 0.000 claims description 17
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 17
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 13
- 229910001882 dioxygen Inorganic materials 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 6
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical group OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229960003330 pentetic acid Drugs 0.000 claims description 3
- 239000007844 bleaching agent Substances 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 150000002896 organic halogen compounds Chemical class 0.000 abstract 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 23
- 239000000460 chlorine Substances 0.000 description 23
- 229910052801 chlorine Inorganic materials 0.000 description 21
- 229920005610 lignin Polymers 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 229910021653 sulphate ion Inorganic materials 0.000 description 5
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 229910021654 trace metal Inorganic materials 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000011122 softwood Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 2
- 150000001342 alkaline earth metals Chemical class 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910001902 chlorine oxide Inorganic materials 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012978 lignocellulosic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000004448 titration Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- HLLSOEKIMZEGFV-UHFFFAOYSA-N 4-(dibutylsulfamoyl)benzoic acid Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 HLLSOEKIMZEGFV-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 150000002497 iodine compounds Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical group [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- -1 nitrate ions Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 150000004045 organic chlorine compounds Chemical class 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
-
- 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
- D21C9/1042—Use of chelating 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
- D21C9/1057—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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paper (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Compounds Of Unknown Constitution (AREA)
- Seasonings (AREA)
- General Preparation And Processing Of Foods (AREA)
- Jellies, Jams, And Syrups (AREA)
- Detergent Compositions (AREA)
Claims (10)
1. Förfarande för reducering av mängden halogenorganisk 25 substans i avloppsvatten frän delignifiering och blekning av kemiskt uppsluten lignocellulosahaltig massa, genom att behandla massan med ett komplexbildande ämne och med ett peroxidinnehällande ämne, varefter massan bleks med en halogeninnehällande förening, kännetecknat därav, att 30 i ett första steg massan behandlas med nämnda komplexbil dande ämne vid ett pH inom intervallet frän 3,1 upp tili 9 och vid en temperatur inom intervallet frän 10°C upp tili 100°C, och att i ett andra steg, massan behandlas med nämnda peroxidinnehällande ämne vid ett pH inom in-35 tervailet frän 7 upp tili 13, och att bakvatten frän bleksteget innehällande nämnda halogeninnehällande förening äterföres tili nägot av de föregäende stegen. 96974
2. Förfarande enligt patentkravet 1, kännetecknat därav, att bakvatten frän halogeninnehällande bleksteg äterföres tili första behandlingssteget. 5 3. Förfarande enligt patentkraven 1 och 2, kännetecknat därav, att blekkemikalier innehällande halogen innefattar teknisk klordioxid.
4. Förfarande enligt patentkravet 1, kännetecknat därav, 10 att behandlingen med komplexbildare och peroxidinnehäl- lande ämne genomföres efter ett syrgassteg.
5. Förfarande enligt patentkravet 1, kännetecknat därav, att det första behandlingssteget genomföres vid ett pH av 15 frän 4 tili 8.
6. Förfarande enligt patentkravet 1, kännetecknat därav, att massan tvättas mellan första och andra behandlingssteget . : 20
7. Förfarande enligt patentkravet 1, kännetecknat därav, att det komplexbildande ämnet är dietylentriaminpenta-ättiksyra (DTPA) eller etylendiamintetraättiksyra (EDTA). 25 8. Förfarande enligt patentkravet 1, kännetecknat därav, att det peroxidinnehällande ämnet är väteperoxid eller en blandning av väteperoxid och syrgas.
9. Förfarande enligt patentkravet 1, kännetecknat därav, 30 att bakvatten frän första och andra behandlingssteget blandas och uppehälles i frän 5 tili 180 minuter innan utsläpp tili recipienten.
10. Förfarande enligt patentkravet 1-9, kännetecknat 35 därav, att det första steget genomföres vid en temperatur av frän 40 till 95°C och under en tid av frän 1 tili 360 min samt att det andra steget genomföres vid en tempe-
96 S' 7 4 ratur av frän 50 till 130°C och under en tid av frän 5 till 960 min, varvid den behandlade massan har en kon-centration av frän 1 till 50 vikt-%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9001449A SE466061B (sv) | 1990-04-23 | 1990-04-23 | Blekning av kemisk massa genom behandling med foerst ett komplexbildande aemne och sedan ett peroxidinnehaallande aemne |
| SE9001449 | 1990-04-23 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| FI911908A0 FI911908A0 (sv) | 1991-04-19 |
| FI911908A FI911908A (sv) | 1991-10-24 |
| FI96974B true FI96974B (sv) | 1996-06-14 |
| FI96974C FI96974C (sv) | 1996-09-25 |
Family
ID=20379258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI911908A FI96974C (sv) | 1990-04-23 | 1991-04-19 | Förfarande för blekning av lignocellulosahaltigt material |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US5143580A (sv) |
| EP (1) | EP0456626B1 (sv) |
| JP (1) | JPH0660475B2 (sv) |
| AT (1) | ATE87987T1 (sv) |
| AU (1) | AU641751B2 (sv) |
| BR (1) | BR9101586A (sv) |
| CA (1) | CA2040871C (sv) |
| DE (1) | DE69100060T2 (sv) |
| ES (1) | ES2040151T3 (sv) |
| FI (1) | FI96974C (sv) |
| LT (1) | LT3210B (sv) |
| LV (1) | LV10516B (sv) |
| NO (1) | NO176059C (sv) |
| NZ (1) | NZ237866A (sv) |
| PT (1) | PT97455B (sv) |
| RU (1) | RU2044808C1 (sv) |
| SE (1) | SE466061B (sv) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI89516B (fi) | 1989-05-10 | 1993-06-30 | Ahlstroem Oy | Foerfarande foer blekning av cellulosamassa med otson |
| US5322598A (en) * | 1990-02-06 | 1994-06-21 | Olin Corporation | Chlorine dioxide generation using inert load of sodium perchlorate |
| SE468355B (sv) * | 1991-04-30 | 1992-12-21 | Eka Nobel Ab | Blekning av kemisk massa genom behandling med komplexbildare och ozon |
| FR2692499B1 (fr) * | 1992-06-22 | 1994-08-26 | Atochem Elf Sa | Procédé de délignification et de blanchiment d'une matière lignocellulosique. |
| SE500113C2 (sv) * | 1992-07-09 | 1994-04-18 | Kamyr Ab | Sätt vid blekning av massa för omhändertagande av utlösta metaller |
| SE9301160L (sv) * | 1992-08-28 | 1994-03-01 | Sunds Defibrator Ind Ab | Förfarande för behandling av processvatten |
| JPH06116889A (ja) * | 1992-09-30 | 1994-04-26 | New Oji Paper Co Ltd | 木材化学パルプの漂白法 |
| US5401362A (en) * | 1993-03-24 | 1995-03-28 | Kamyr, Inc. | Control of metals and dissolved organics in the bleach plant |
| SE500616C2 (sv) * | 1993-06-08 | 1994-07-25 | Kvaerner Pulping Tech | Blekning av kemisk massa med peroxid vid övertryck |
| SE502172C2 (sv) * | 1993-12-15 | 1995-09-04 | Mo Och Domsjoe Ab | Förfarande för framställning av blekt cellulosamassa med en klorfri bleksekvens i närvaro av karbonat |
| SE502706E (sv) | 1994-04-05 | 1999-09-27 | Mo Och Domsjoe Ab | Framställnng av blekt cellulosamassa genom blekning med klordioxid och behandling av komplexbildare i samma steg |
| US6776876B1 (en) | 1994-10-13 | 2004-08-17 | Andritz Oy | Method of treating cellulosic pulp to remove hexenuronic acid |
| FI102301B (sv) * | 1994-10-13 | 1998-11-13 | Andritz Oy | Förfarande för behandling av cellulosamassor |
| US6706143B1 (en) * | 1996-03-19 | 2004-03-16 | International Paper Company | Minimizing chlorinated organics in pulp bleaching processes |
| FR2747407B1 (fr) * | 1996-04-12 | 1998-05-07 | Atochem Elf Sa | Procede de delignification et de blanchiment de pates a papier chimiques |
| US6375797B1 (en) * | 1996-06-20 | 2002-04-23 | Andritz-Ahlstrom Oy | Bleaching chemical pulp in a PkDQ-Po Sequence |
| US6322768B1 (en) | 1998-09-29 | 2001-11-27 | International Paper Company | Recovery of chlorine dioxide from gas streams |
| JP4513959B2 (ja) * | 2004-09-17 | 2010-07-28 | 三菱瓦斯化学株式会社 | 製紙用化学パルプの半晒漂白方法 |
| US20080110584A1 (en) * | 2006-11-15 | 2008-05-15 | Caifang Yin | Bleaching process with at least one extraction stage |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA575636A (en) * | 1959-05-12 | E. Smedberg George | Bleaching of wood pulps | |
| US3251731A (en) * | 1963-02-11 | 1966-05-17 | Andrew J Gard | Bleaching of wood pulp with a sequestering agent and hydrogen peroxide |
| FI45574C (sv) * | 1970-05-11 | 1972-07-10 | Kymin Oy Kymmene Ab | Förfarande för blekning av cellulosahaltiga material. |
| DE2219504C2 (de) * | 1972-04-21 | 1974-10-03 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Mehrstufenbleiche von Zellstoffen mit erheblich reduziertem Chloreinsatz |
| DE2538673C2 (de) * | 1975-08-30 | 1986-01-16 | Degussa Ag, 6000 Frankfurt | Bleichaufschluß von Zellstoff mit erheblich reduziertem Chloreinsatz |
| SE420430B (sv) * | 1978-02-17 | 1981-10-05 | Mo Och Domsjoe Ab | Forfarande for blekning och extraktion av lignocellulosahaltig material med peroxidhaltiga blekmedel |
| FR2457339A1 (fr) * | 1979-05-25 | 1980-12-19 | Interox | Procede pour la delignification et le blanchiment de pates cellulosiques chimiques et semi-chimiques |
| SU903429A1 (ru) * | 1980-06-05 | 1982-02-07 | Центральный научно-исследовательский институт бумаги | Способ отбелки древесной массы |
| FR2520397A1 (fr) * | 1982-01-28 | 1983-07-29 | Centre Tech Ind Papier | Procede pour le traitement de pates papetieres chimiques |
| US4826568A (en) * | 1985-08-05 | 1989-05-02 | Interox (Societe Anonyme) | Process for delignification of cellulosic substances by pretreating with a complexing agent followed by peroxide prior to kraft digestion |
| DE3620980A1 (de) * | 1986-06-23 | 1988-01-14 | Schott Glaswerke | Kontinuierliches mehrstufen-verfahren zur aufbereitung der bleicherei-abwaesser aus der zellstoffproduktion |
| US4732650A (en) * | 1986-09-15 | 1988-03-22 | The Dow Chemical Company | Bleaching of cellulosic pulps using hydrogen peroxide |
| FR2613388B1 (fr) * | 1987-04-02 | 1990-05-04 | Atochem | Procede de blanchiment de pates |
| US4946556A (en) * | 1989-04-25 | 1990-08-07 | Kamyr, Inc. | Method of oxygen delignifying wood pulp with between stage washing |
-
1990
- 1990-04-23 SE SE9001449A patent/SE466061B/sv not_active Application Discontinuation
-
1991
- 1991-04-08 EP EP91850091A patent/EP0456626B1/en not_active Expired - Lifetime
- 1991-04-08 AT AT91850091T patent/ATE87987T1/de active
- 1991-04-08 DE DE9191850091T patent/DE69100060T2/de not_active Expired - Fee Related
- 1991-04-08 ES ES199191850091T patent/ES2040151T3/es not_active Expired - Lifetime
- 1991-04-18 NZ NZ237866A patent/NZ237866A/xx unknown
- 1991-04-19 BR BR919101586A patent/BR9101586A/pt not_active IP Right Cessation
- 1991-04-19 FI FI911908A patent/FI96974C/sv active
- 1991-04-19 CA CA002040871A patent/CA2040871C/en not_active Expired - Fee Related
- 1991-04-19 NO NO911569A patent/NO176059C/no unknown
- 1991-04-22 JP JP3116634A patent/JPH0660475B2/ja not_active Expired - Lifetime
- 1991-04-22 AU AU75217/91A patent/AU641751B2/en not_active Ceased
- 1991-04-23 PT PT97455A patent/PT97455B/pt not_active IP Right Cessation
- 1991-04-23 RU SU914895240A patent/RU2044808C1/ru active
- 1991-04-23 US US07/689,502 patent/US5143580A/en not_active Expired - Fee Related
-
1992
- 1992-12-30 LV LVP-92-608A patent/LV10516B/xx unknown
-
1993
- 1993-03-19 LT LTIP443A patent/LT3210B/lt not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU7521791A (en) | 1991-10-24 |
| ATE87987T1 (de) | 1993-04-15 |
| CA2040871A1 (en) | 1991-10-24 |
| LT3210B (en) | 1995-03-27 |
| NO176059C (no) | 1995-01-25 |
| AU641751B2 (en) | 1993-09-30 |
| JPH0660475B2 (ja) | 1994-08-10 |
| DE69100060T2 (de) | 1993-09-16 |
| EP0456626A1 (en) | 1991-11-13 |
| FI911908A0 (sv) | 1991-04-19 |
| DE69100060D1 (de) | 1993-05-13 |
| EP0456626B1 (en) | 1993-04-07 |
| LV10516A (lv) | 1995-02-20 |
| LTIP443A (en) | 1994-10-25 |
| LV10516B (en) | 1995-04-20 |
| SE466061B (sv) | 1991-12-09 |
| NO176059B (no) | 1994-10-17 |
| JPH04228690A (ja) | 1992-08-18 |
| US5143580A (en) | 1992-09-01 |
| ES2040151T3 (es) | 1993-10-01 |
| FI911908A (sv) | 1991-10-24 |
| SE9001449L (sv) | 1991-10-24 |
| PT97455A (pt) | 1992-01-31 |
| SE9001449D0 (sv) | 1990-04-23 |
| CA2040871C (en) | 1997-05-20 |
| NZ237866A (en) | 1992-11-25 |
| NO911569L (no) | 1991-10-24 |
| NO911569D0 (no) | 1991-04-19 |
| FI96974C (sv) | 1996-09-25 |
| BR9101586A (pt) | 1991-12-10 |
| RU2044808C1 (ru) | 1995-09-27 |
| PT97455B (pt) | 1998-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BB | Publication of examined application |