SE9500926D0 - Pulp bleaching process - Google Patents
Pulp bleaching processInfo
- Publication number
- SE9500926D0 SE9500926D0 SE9500926A SE9500926A SE9500926D0 SE 9500926 D0 SE9500926 D0 SE 9500926D0 SE 9500926 A SE9500926 A SE 9500926A SE 9500926 A SE9500926 A SE 9500926A SE 9500926 D0 SE9500926 D0 SE 9500926D0
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- bleaching process
- pulp bleaching
- stage
- bleaching
- 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
- 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
Cellulose pulp is treated by (a) treating a pH 2-7 (the acid stage) for at least 10 sec. so that the fibres reach pH 2-7; (b) washing or pressing the pulp; and (c) bleaching the pulp in a multistage sequence at 80-120 deg C in each stage, including at least one peroxide bleaching stage after step (b).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI941229A FI98839B (en) | 1994-03-16 | 1994-03-16 | Method for bleaching of pulp |
Publications (4)
Publication Number | Publication Date |
---|---|
SE9500926D0 true SE9500926D0 (en) | 1995-03-16 |
SE9500926L SE9500926L (en) | 1995-09-17 |
SE511743C2 SE511743C2 (en) | 1999-11-15 |
SE511743C3 SE511743C3 (en) | 2000-01-10 |
Family
ID=8540324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9500926A SE511743C3 (en) | 1994-03-16 | 1995-03-16 | Ozone bleaching at medium concentration and high temperature |
Country Status (3)
Country | Link |
---|---|
CA (1) | CA2144825A1 (en) |
FI (1) | FI98839B (en) |
SE (1) | SE511743C3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI105701B (en) | 1995-10-20 | 2000-09-29 | Ahlstrom Machinery Oy | Method and arrangement for treatment of pulp |
CN113897813B (en) * | 2021-09-17 | 2022-10-04 | 华南理工大学 | Method for bleaching eucalyptus plate bark pulp by ozone in short sequence |
-
1994
- 1994-03-16 FI FI941229A patent/FI98839B/en active
-
1995
- 1995-03-16 CA CA002144825A patent/CA2144825A1/en not_active Abandoned
- 1995-03-16 SE SE9500926A patent/SE511743C3/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CA2144825A1 (en) | 1995-09-17 |
FI941229A (en) | 1995-09-17 |
SE511743C3 (en) | 2000-01-10 |
SE9500926L (en) | 1995-09-17 |
FI98839B (en) | 1997-05-15 |
FI941229A0 (en) | 1994-03-16 |
SE511743C2 (en) | 1999-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CANC | Patent cancelled, revoked after opposition | ||
NUG | Patent has lapsed |