SE9602686D0 - Bleaching of pulp - Google Patents
Bleaching of pulpInfo
- Publication number
- SE9602686D0 SE9602686D0 SE9602686A SE9602686A SE9602686D0 SE 9602686 D0 SE9602686 D0 SE 9602686D0 SE 9602686 A SE9602686 A SE 9602686A SE 9602686 A SE9602686 A SE 9602686A SE 9602686 D0 SE9602686 D0 SE 9602686D0
- Authority
- SE
- Sweden
- Prior art keywords
- vessel
- alkali
- pulp
- oxygen
- fed
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The pulp is fed (1) to a first stage vessel after mixing (2) with oxygen and alkali. Vessel (3) operates at a pressure of over 3 bar. Additional oxygen as hydrogen peroxide with more alkali is mixed (9) and fed to second vessel (4) with low pressure steam for heating purposes. Vessel (4) operates at 90-120 deg C and the pressure is adapted to the operating temperature. Preferably most oxygen and alkali is added to mixer (2) just after pump means (1). Hydrogen peroxide at up to 5Kg per ton and more alkali are added before the downward flowing second treatment vessel (4). Low pressure steam can be used to heat said vessel (4) to a temperature in the range 90-120 deg C. A gas space at the top of vessel(4) allows degassing (6) of the pulp with heat recovery by flashing (5,7) or by heating dilution liquids to further improve the process economy.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602686A SE507870C2 (en) | 1996-07-05 | 1996-07-05 | Two=stage oxygen delignification of paper pulp |
EP97915790A EP0891439A1 (en) | 1996-03-26 | 1997-03-07 | Oxygen delignification of pulp in two stages |
PCT/SE1997/000392 WO1997036042A1 (en) | 1996-03-26 | 1997-03-07 | Oxygen delignification of pulp in two stages |
BR9708265A BR9708265A (en) | 1996-03-26 | 1997-03-07 | Two-stage chemical pulp oxygen delignification process |
JP9534303A JP2000507317A (en) | 1996-03-26 | 1997-03-07 | Pulp delignification with oxygen in two steps. |
US09/155,119 US6221207B1 (en) | 1996-03-26 | 1997-03-07 | Oxygen delignification of pulp in two stages with low pressure steam heating between stages |
AU23127/97A AU2312797A (en) | 1996-03-26 | 1997-03-07 | Oxygen delignification of pulp in two stages |
IDP970983A ID18754A (en) | 1996-03-26 | 1997-03-25 | PAPER BLEACHING BLEACHING |
US09/781,480 US20010050152A1 (en) | 1996-03-26 | 2001-02-12 | Oxygen delignification of pulp in two stages |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602686A SE507870C2 (en) | 1996-07-05 | 1996-07-05 | Two=stage oxygen delignification of paper pulp |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9602686D0 true SE9602686D0 (en) | 1996-07-05 |
SE9602686L SE9602686L (en) | 1998-01-06 |
SE507870C2 SE507870C2 (en) | 1998-07-20 |
Family
ID=20403312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9602686A SE507870C2 (en) | 1996-03-26 | 1996-07-05 | Two=stage oxygen delignification of paper pulp |
Country Status (1)
Country | Link |
---|---|
SE (1) | SE507870C2 (en) |
-
1996
- 1996-07-05 SE SE9602686A patent/SE507870C2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE507870C2 (en) | 1998-07-20 |
SE9602686L (en) | 1998-01-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |