GB1452710A - Method for bleaching of material containing cellulose - Google Patents
Method for bleaching of material containing celluloseInfo
- Publication number
- GB1452710A GB1452710A GB5403874A GB5403874A GB1452710A GB 1452710 A GB1452710 A GB 1452710A GB 5403874 A GB5403874 A GB 5403874A GB 5403874 A GB5403874 A GB 5403874A GB 1452710 A GB1452710 A GB 1452710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulp
- oxygen
- foam
- sodium hydroxide
- foaming agent
- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
-
- 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
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Conductive Materials (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
1452710 Bleaching wood pulp A AHLSTROM OSAKEYHTIO 13 Dec 1974 [20 Dec 1973] 54038/74 Heading DIP A foamed suspension of wood pulp is bleached to remove lignine by treating with alkali solution and oxidising gas at elevated temperature and pressure. The foam is stabilised with 1 kg/ton of pulp of a foaming agent (a polyoxyalkylene-condensate, dodecylbenzene sulphonate, octylphenoxypolyethoxy ethanol or black liquor. The oxidising gas may be oxygen, air, ozone, chlorine, chlorine dioxide or mixtures thereof. Pulp is digested at 1 and washed to remove most of the black liquor. The pulp, oxygen gas and foaming agent are mixed at 3 and sodium hydroxide solution, oxygen and steam added to reactor 8. A pressure reducing valve may be situated between mixer 3 and reactor 8 to expand the bubbles in the foam. The amount of pulp in the foam is up to 15% by wt., e.g. 8 or 10%. The sodium hydroxide may comprise 6% by weight. Specified reactor conditions are temperature 90 or 110C, pressure 4 atmospheres for 10 to 30 minutes. The bleached pulp is degassified at 11 and washed at 10. Kappa valves of 14 to 16.5 are obtained. In the embodiment of Fig. 2, not shown the sodium hydroxide and the foaming agent are applied to the pulp simultaneously and then the oxygen is applied.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7317221A SE390549C (en) | 1973-12-20 | 1973-12-20 | SET TO BLOW CELLULOSIC MATERIAL WITH ACID OR FREE ACID CONTAINING GAS IN ALKALIC ENVIRONMENT |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1452710A true GB1452710A (en) | 1976-10-13 |
Family
ID=20319462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5403874A Expired GB1452710A (en) | 1973-12-20 | 1974-12-13 | Method for bleaching of material containing cellulose |
Country Status (12)
Country | Link |
---|---|
JP (1) | JPS524643B2 (en) |
BR (1) | BR7410652D0 (en) |
CA (1) | CA1065105A (en) |
DE (1) | DE2460144B2 (en) |
FI (1) | FI52878C (en) |
FR (1) | FR2255419B1 (en) |
GB (1) | GB1452710A (en) |
IT (1) | IT1027773B (en) |
NO (1) | NO142128C (en) |
SE (1) | SE390549C (en) |
SU (1) | SU850019A3 (en) |
ZA (1) | ZA747918B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS563214Y2 (en) * | 1978-05-15 | 1981-01-24 | ||
US4209359A (en) * | 1978-10-23 | 1980-06-24 | International Paper Company | Process for removing residual oxygen from oxygen-bleached pulp |
SE462919B (en) * | 1979-05-11 | 1990-09-17 | Sunds Defibrator Ind Ab | PROCEDURE TO PERFORM ALKALIE EXTRACTION OF CELLULOSAMASS IN THE PRESENCE OF ACID |
US4574032A (en) * | 1979-10-15 | 1986-03-04 | Westvaco Corporation | Process for delignification of lignocellulosic material in the presence of anthraquinone in solution with white and black liquors |
SE452896B (en) * | 1985-01-24 | 1987-12-21 | Aga Ab | METHOD OF TREATING CELLULOSAMASSOR |
SE460202B (en) * | 1987-03-13 | 1989-09-18 | Aga Ab | SEATED AS TREATMENT OF A MATERIAL WITH A GAS IN A SCIENCE |
FI89516B (en) * | 1989-05-10 | 1993-06-30 | Ahlstroem Oy | Foerfarande Foer blekning av cellulosamassa med Otson |
US5460696A (en) * | 1993-08-12 | 1995-10-24 | The Boc Group, Inc. | Oxygen delignification method incorporating wood pulp mixing apparatus |
-
1973
- 1973-12-20 SE SE7317221A patent/SE390549C/en unknown
-
1974
- 1974-12-11 CA CA215,743A patent/CA1065105A/en not_active Expired
- 1974-12-12 ZA ZA00747918A patent/ZA747918B/en unknown
- 1974-12-13 GB GB5403874A patent/GB1452710A/en not_active Expired
- 1974-12-19 SU SU742090807A patent/SU850019A3/en active
- 1974-12-19 BR BR10652/74A patent/BR7410652D0/en unknown
- 1974-12-19 FI FI743702A patent/FI52878C/en active
- 1974-12-19 NO NO744609A patent/NO142128C/en unknown
- 1974-12-19 DE DE19742460144 patent/DE2460144B2/en not_active Ceased
- 1974-12-19 IT IT70687/74A patent/IT1027773B/en active
- 1974-12-19 JP JP49146650A patent/JPS524643B2/ja not_active Expired
- 1974-12-20 FR FR7442400A patent/FR2255419B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NO744609L (en) | 1975-07-14 |
IT1027773B (en) | 1978-12-20 |
NO142128C (en) | 1980-07-02 |
SE390549B (en) | 1976-12-27 |
CA1065105A (en) | 1979-10-30 |
DE2460144B2 (en) | 1977-03-03 |
SU850019A3 (en) | 1981-07-23 |
FI370274A (en) | 1975-06-21 |
JPS5094202A (en) | 1975-07-26 |
SE7317221L (en) | 1975-06-23 |
FR2255419A1 (en) | 1975-07-18 |
NO142128B (en) | 1980-03-24 |
BR7410652D0 (en) | 1975-09-02 |
FR2255419B1 (en) | 1979-06-01 |
SE390549C (en) | 1986-04-14 |
FI52878B (en) | 1977-08-31 |
FI52878C (en) | 1987-09-24 |
ZA747918B (en) | 1975-12-31 |
JPS524643B2 (en) | 1977-02-05 |
DE2460144A1 (en) | 1975-07-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |