GB1062734A - Improvements in or relating to bleaching cellulose pulp - Google Patents
Improvements in or relating to bleaching cellulose pulpInfo
- Publication number
- GB1062734A GB1062734A GB1148364A GB1148364A GB1062734A GB 1062734 A GB1062734 A GB 1062734A GB 1148364 A GB1148364 A GB 1148364A GB 1148364 A GB1148364 A GB 1148364A GB 1062734 A GB1062734 A GB 1062734A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bleaching
- washed
- bleached
- pulp
- cellulose pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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
- D21C9/1026—Other features in bleaching processes
- D21C9/1047—Conserving the bleached pulp
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The resistance to brightness reversion and degradation in the ageing of bleached cellulose pulp e.g. sulphate pulp and sulphite pulp, is increased by treating it for 1-6 hours with water or an aqueous solution of a mineral acid or an alkali, the concentration of which is such that the pH of the solution is between 2 and 12, at a temperature above 80 DEG C. prior to or after bleaching or as an intermediate step between any of the bleaching steps in the bleaching procedure. A major proportion of the lignin may be removed prior to the treatment. In a preferred process the cellulosic material may be cooked, washed, screened, chlorinated, washed with alkali and bleached with hypochlorite in a first step and then washed, treated with water and finally bleached with chlorine dioxide in two steps with an intermediate alkaline treatment.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE311563 | 1963-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1062734A true GB1062734A (en) | 1967-03-22 |
Family
ID=20261429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1148364A Expired GB1062734A (en) | 1963-03-21 | 1964-03-18 | Improvements in or relating to bleaching cellulose pulp |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH440945A (en) |
FI (1) | FI42785B (en) |
GB (1) | GB1062734A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0856080A1 (en) | 1995-10-20 | 1998-08-05 | Ahlstrom Machinery Oy | Acid treatment of pulp at high temperature in connection with bleaching |
US6736934B1 (en) | 1995-02-17 | 2004-05-18 | Andritz Oy | Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
WO2006091140A1 (en) * | 2005-02-24 | 2006-08-31 | Gl&V Management Hungary Kft | Method for treatment of bleached chemical pulp |
US8920603B2 (en) | 2006-10-11 | 2014-12-30 | Akzo Nobel N.V. | Bleaching of pulp |
-
1964
- 1964-03-18 GB GB1148364A patent/GB1062734A/en not_active Expired
- 1964-03-20 FI FI61264A patent/FI42785B/fi active
- 1964-03-23 CH CH370764A patent/CH440945A/en unknown
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6736934B1 (en) | 1995-02-17 | 2004-05-18 | Andritz Oy | Method of pretreating pulp in an acid tower prior to bleaching with peroxide |
EP0856080A1 (en) | 1995-10-20 | 1998-08-05 | Ahlstrom Machinery Oy | Acid treatment of pulp at high temperature in connection with bleaching |
US6306253B2 (en) | 1995-10-20 | 2001-10-23 | Andritz-Ahlstrom Oy | Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching |
WO2006091140A1 (en) * | 2005-02-24 | 2006-08-31 | Gl&V Management Hungary Kft | Method for treatment of bleached chemical pulp |
US8920603B2 (en) | 2006-10-11 | 2014-12-30 | Akzo Nobel N.V. | Bleaching of pulp |
Also Published As
Publication number | Publication date |
---|---|
FI42785B (en) | 1970-06-30 |
CH440945A (en) | 1967-07-31 |
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