SE9900425L - Pulp Delignification Procedure - Google Patents
Pulp Delignification ProcedureInfo
- Publication number
- SE9900425L SE9900425L SE9900425A SE9900425A SE9900425L SE 9900425 L SE9900425 L SE 9900425L SE 9900425 A SE9900425 A SE 9900425A SE 9900425 A SE9900425 A SE 9900425A SE 9900425 L SE9900425 L SE 9900425L
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- oxygen
- alkali
- aqueous solution
- unit operation
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 4
- 229910052760 oxygen Inorganic materials 0.000 abstract 4
- 239000001301 oxygen Substances 0.000 abstract 4
- 229920001131 Pulp (paper) Polymers 0.000 abstract 2
- 239000003513 alkali Substances 0.000 abstract 2
- 239000007864 aqueous solution Substances 0.000 abstract 2
- 238000004061 bleaching Methods 0.000 abstract 2
- 238000010977 unit operation Methods 0.000 abstract 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 abstract 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 abstract 1
- 150000002978 peroxides Chemical class 0.000 abstract 1
- 239000000243 solution Substances 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
A process for oxygen delignification of chemical pulp comprising an oxygen treatment unit operation stage in which the pulp is treated while suspended in an aqueous solution with oxygen in the presence of alkali, whereby the pulp consistency is less than 20%; more than 50 percentage by weight of the alkali consist of one or more carbonates; and the pH of the aqueous solution during the process is adapted to provide for the essential absence of bicarbonate in said solution during the treatment. Furthermore a process for the bleaching of chemical pulp comprising a peroxide bleaching unit operation stage and an oxygen delignification process of said kind.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9900425A SE9900425L (en) | 1999-02-09 | 1999-02-09 | Pulp Delignification Procedure |
EP00908150A EP1161593A1 (en) | 1999-02-09 | 2000-01-28 | Oxygen delignification of pulp in the presence of carbonates as alkali |
AU29524/00A AU2952400A (en) | 1999-02-09 | 2000-01-28 | Oxygen delignification of pulp in the presence of carbonates as alkali |
PCT/SE2000/000172 WO2000047813A1 (en) | 1999-02-09 | 2000-01-28 | Oxygen delignification of pulp in the presence of carbonates as alkali |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9900425A SE9900425L (en) | 1999-02-09 | 1999-02-09 | Pulp Delignification Procedure |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9900425D0 SE9900425D0 (en) | 1999-02-09 |
SE9900425L true SE9900425L (en) | 2000-09-04 |
Family
ID=20414399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9900425A SE9900425L (en) | 1999-02-09 | 1999-02-09 | Pulp Delignification Procedure |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1161593A1 (en) |
AU (1) | AU2952400A (en) |
SE (1) | SE9900425L (en) |
WO (1) | WO2000047813A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ530225A (en) * | 2001-06-29 | 2006-07-28 | Voith Paper Fiber Systems Gmbh | A Method for delignifying lignocellulosic raw materials |
DE10323376A1 (en) * | 2003-05-21 | 2004-12-16 | Voith Paper Fiber Systems Gmbh & Co. Kg | Delignification procedure |
FI20070126A0 (en) | 2006-09-08 | 2007-02-13 | Linde Ag | Process for de-pulping and using carbon dioxide or (bi) carbonate for this |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE219677C1 (en) * | ||||
GB1262655A (en) * | 1968-09-20 | 1972-02-02 | Canadian Ind | Bleaching of wood pulp |
FI48764C (en) * | 1973-05-30 | 1977-07-26 | Ahlstroem Oy | Method and apparatus for bleaching cellulose pulp with molecular weight. |
-
1999
- 1999-02-09 SE SE9900425A patent/SE9900425L/en not_active Application Discontinuation
-
2000
- 2000-01-28 AU AU29524/00A patent/AU2952400A/en not_active Abandoned
- 2000-01-28 WO PCT/SE2000/000172 patent/WO2000047813A1/en active Application Filing
- 2000-01-28 EP EP00908150A patent/EP1161593A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
SE9900425D0 (en) | 1999-02-09 |
EP1161593A1 (en) | 2001-12-12 |
AU2952400A (en) | 2000-08-29 |
WO2000047813A1 (en) | 2000-08-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |