SE9100744D0 - SAVE TO PASTE - Google Patents
SAVE TO PASTEInfo
- Publication number
- SE9100744D0 SE9100744D0 SE9100744A SE9100744A SE9100744D0 SE 9100744 D0 SE9100744 D0 SE 9100744D0 SE 9100744 A SE9100744 A SE 9100744A SE 9100744 A SE9100744 A SE 9100744A SE 9100744 D0 SE9100744 D0 SE 9100744D0
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- pref
- stage
- amt
- ozone
- Prior art date
Links
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract 9
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 abstract 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract 3
- 235000006408 oxalic acid Nutrition 0.000 abstract 3
- 239000004155 Chlorine dioxide Substances 0.000 abstract 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract 2
- 235000019398 chlorine dioxide Nutrition 0.000 abstract 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 1
- 239000002253 acid Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 238000004061 bleaching Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 abstract 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 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
- D21C9/1057—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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The bleaching sequence consists of a first stage in which ozone is used, a second stage in which the pulp is alkaline-extracted in the presence of oxygen and possibly hydrogen peroxide, and at least one final stage in which chlorine dioxide and/or peracetic acid are applied. - Ozone is added in the first stage in an amt. of 1 - 20 kg., pref. 2 - 8 kg per ton of dry pulp, chlorine dioxide, when used, in an amt. of at most 20 kg., pref. at most 15 kgs., dry pulp reckoned as active chlorine, and peracetic acid, when used, in an amt. of at most 30 kg., pref. at most 20 kg per ton of dry pulp. - Pulp with a consistency of 6 - 15% is treated with acid and then in the first stage with a oxalic acid ina ddition to ozone, whereby oxalic acid and ozone are added to the pulp when it is in a fluidised state. No washing occurs between the addition of these two agents. Oxalic acid is added in an amt. of 2 - 20 kg., pref. 5 - 10 kg. per ton dry pulp, producing a pulp with a lightness of at least 85% ISO, pref. at least 87% ISO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9100744A SE9100744L (en) | 1991-03-12 | 1991-03-12 | Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9100744A SE9100744L (en) | 1991-03-12 | 1991-03-12 | Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE9100744D0 true SE9100744D0 (en) | 1991-03-12 |
| SE9100744L SE9100744L (en) | 1992-09-13 |
Family
ID=20382144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9100744A SE9100744L (en) | 1991-03-12 | 1991-03-12 | Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE9100744L (en) |
-
1991
- 1991-03-12 SE SE9100744A patent/SE9100744L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE9100744L (en) | 1992-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| SE8100373L (en) | PROCEDURE FOR OZONE WHITING OF PAPER Pulp | |
| CA2270524A1 (en) | Method of producing pulp using single-stage cooking with formic acid and washing with performic acid | |
| ES2094465T3 (en) | PROCEDURE FOR THE WHITENING OF A CHEMICAL PAPER PULP. | |
| PT754258E (en) | METHOD FOR THE TREATMENT OF PASTE WITH A COMPLEXACATION AGENT IN CONJUGACAO WITH A STAGE OF TREATMENT WITH CHLORO DIOXIDE | |
| NO893714L (en) | PROCEDURE FOR PLEASING WHEAT. | |
| FI940412A0 (en) | Oxygen / ozone / peracetic acid delignification and bleaching of cellulosic pulps | |
| NO920969D0 (en) | PROCEDURE FOR WHEATING PLANT MATERIALS IN A DRY ENVIRONMENT | |
| NO169023C (en) | PROCEDURES FOR BLACKING AND DELIGNIFICATION OF CELLULOSE-CONTAINING PRODUCTS | |
| ES2050992T3 (en) | DE-LIGNIFICATION WITH OXYGEN REINFORCED WITH HYDROGEN PEROXIDE. | |
| SE9100744D0 (en) | SAVE TO PASTE | |
| YU23892A (en) | PROCESS FOR BLEACHING CHEMICAL PAPER PAPER AND APPLICATION OF THIS PROCEDURE FOR BLEACHING KRAFT PULP | |
| CA2137450A1 (en) | Bleaching recycled pulp with ozone and hydrogen peroxide | |
| SE9203122D0 (en) | PROCEDURE FOR PEROXID WHITING OF SULPHATE Pulp | |
| CA2021392A1 (en) | Process of stabilizing the viscosity & strength of pulps | |
| ES2055602T3 (en) | CHEMICAL PASTE WHITENING. | |
| SE9303233D0 (en) | Use chlorine-free bleaching of pulp | |
| SE9700884L (en) | Bleaching with chlorine dioxide in a three-phase step | |
| ES2109273T3 (en) | BLEACHING OF CHEMICAL WOOD PASTE USING CHLORINE / CHLORINE DIOXIDE AND THEN OZONE. | |
| SE9500573D0 (en) | Bleaching pulp with peroxide at superatmospheric pressure and in multiple stages | |
| SE9203859D0 (en) | CHLORINE-FREE Mass Bleaching | |
| TH25778A (en) | Bleaching mixtures containing a bleaching activator that produces a maltipersic acid. | |
| SE8904247L (en) | PROCEDURE FOR BLACKING OF CHEMICAL CELLULOSAMASSA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NAV | Patent application has lapsed |
Ref document number: 9100744-3 Format of ref document f/p: F |