GB1544216A - Bleaching and digesting cellulosic pulp - Google Patents
Bleaching and digesting cellulosic pulpInfo
- Publication number
- GB1544216A GB1544216A GB16311/76A GB1631176A GB1544216A GB 1544216 A GB1544216 A GB 1544216A GB 16311/76 A GB16311/76 A GB 16311/76A GB 1631176 A GB1631176 A GB 1631176A GB 1544216 A GB1544216 A GB 1544216A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bleaching
- effluent
- pulp
- alkali
- alkaline peroxide
- 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Cosmetics (AREA)
Abstract
The bleaching sequences, if appropriate combined with a partial chlorination, start with an alkaline peroxide digestion. In the peroxide stage, the pulp having an alkali content of 0.5-3% by weight, calculated as 100% pure substance and relative to absolutely dry pulp, is bleached at a bleaching liquor temperature of at least 65 DEG C. The process can be carried out unpressurised and hence in simple equipment and allows complete bleaching even of hard pulps. Up to 90% of the substances polluting the effluent are dissolved out by the alkaline peroxide treatment, so that the receiving water course is not polluted thereby. As compared with hitherto conventional processes, about half the quantity of alkali and at most 1/5 of the quantity of chlorine are required. The effluent arising is non-corrosive and can easily be regenerated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2538673A DE2538673C2 (en) | 1975-08-30 | 1975-08-30 | Bleaching of cellulose with considerably reduced use of chlorine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1544216A true GB1544216A (en) | 1979-04-19 |
Family
ID=5955230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16311/76A Expired GB1544216A (en) | 1975-08-30 | 1976-04-22 | Bleaching and digesting cellulosic pulp |
Country Status (17)
| Country | Link |
|---|---|
| AR (1) | AR221678A1 (en) |
| AT (1) | AT340765B (en) |
| BE (1) | BE836462R (en) |
| BR (1) | BR7603006A (en) |
| CA (1) | CA1080406A (en) |
| CH (1) | CH620002A5 (en) |
| DE (1) | DE2538673C2 (en) |
| ES (1) | ES443318A1 (en) |
| FI (1) | FI62869C (en) |
| FR (1) | FR2322235A1 (en) |
| GB (1) | GB1544216A (en) |
| IT (1) | IT1055792B (en) |
| NL (1) | NL7513942A (en) |
| NO (1) | NO145344B (en) |
| SE (1) | SE7602842L (en) |
| YU (1) | YU37370B (en) |
| ZA (1) | ZA757822B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU641751B2 (en) * | 1990-04-23 | 1993-09-30 | Eka Nobel Ab | Process for bleaching of lignocellulose-containing material |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2416297A1 (en) * | 1978-01-31 | 1979-08-31 | Europeen Cellulose | Three-stage paper pulp bleaching - giving high whiteness level, by treating with chlorine, hypochlorite or peroxide oxidant and chlorine di:oxide |
| FR2432574A1 (en) * | 1978-08-01 | 1980-02-29 | Europeen Cellulose | PROCESS FOR BLEACHING PAPER PULP |
| FR2572431B1 (en) * | 1984-10-25 | 1987-12-04 | Centre Tech Ind Papier | PROCESS FOR THE PREPARATION OF CHEMICAL PAPER PULP FOR BLEACHING. |
| DE69004492T3 (en) * | 1989-06-06 | 2001-11-15 | Eka Nobel Ab, Bohus | Process for bleaching pulps containing lignocellulose. |
| SE9001481L (en) * | 1990-04-23 | 1991-10-24 | Eka Nobel Ab | REDUCTION OF HALOGEN ORGANIC SUBSTANCES IN BLEACHING WASTE |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE753531C (en) * | 1938-11-09 | 1953-05-18 | Degussa | Process for bleaching pulp |
| DE2327900C3 (en) * | 1973-06-01 | 1985-02-07 | Degussa Ag, 6000 Frankfurt | Bleaching of cellulose with considerably reduced use of chlorine |
-
1975
- 1975-08-30 DE DE2538673A patent/DE2538673C2/en not_active Expired
- 1975-11-12 AT AT861075A patent/AT340765B/en not_active IP Right Cessation
- 1975-11-25 FI FI753314A patent/FI62869C/en not_active IP Right Cessation
- 1975-11-28 YU YU3012/75A patent/YU37370B/en unknown
- 1975-11-28 NL NL7513942A patent/NL7513942A/en not_active Application Discontinuation
- 1975-12-03 NO NO754077A patent/NO145344B/en unknown
- 1975-12-09 ES ES443318A patent/ES443318A1/en not_active Expired
- 1975-12-09 BE BE6045289A patent/BE836462R/en not_active IP Right Cessation
- 1975-12-15 ZA ZA757822A patent/ZA757822B/en unknown
-
1976
- 1976-01-05 AR AR261846A patent/AR221678A1/en active
- 1976-01-14 IT IT67078/76A patent/IT1055792B/en active
- 1976-02-05 CA CA245,088A patent/CA1080406A/en not_active Expired
- 1976-02-25 FR FR7605307A patent/FR2322235A1/en active Granted
- 1976-02-27 SE SE7602842A patent/SE7602842L/en unknown
- 1976-04-22 GB GB16311/76A patent/GB1544216A/en not_active Expired
- 1976-05-13 BR BR7603006A patent/BR7603006A/en unknown
- 1976-08-26 CH CH1084076A patent/CH620002A5/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU641751B2 (en) * | 1990-04-23 | 1993-09-30 | Eka Nobel Ab | Process for bleaching of lignocellulose-containing material |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2322235B1 (en) | 1979-04-06 |
| CA1080406A (en) | 1980-07-01 |
| YU301275A (en) | 1983-04-27 |
| IT1055792B (en) | 1982-01-11 |
| AT340765B (en) | 1978-01-10 |
| ZA757822B (en) | 1976-11-24 |
| AR221678A1 (en) | 1981-03-13 |
| NO754077L (en) | 1977-03-01 |
| SE7602842L (en) | 1977-03-01 |
| FI753314A (en) | 1977-03-01 |
| BR7603006A (en) | 1977-05-31 |
| ES443318A1 (en) | 1977-05-01 |
| DE2538673C2 (en) | 1986-01-16 |
| YU37370B (en) | 1984-08-31 |
| NO145344B (en) | 1981-11-23 |
| FI62869B (en) | 1982-11-30 |
| CH620002A5 (en) | 1980-10-31 |
| FI62869C (en) | 1983-03-10 |
| NL7513942A (en) | 1977-03-02 |
| BE836462R (en) | 1976-06-09 |
| FR2322235A1 (en) | 1977-03-25 |
| DE2538673A1 (en) | 1977-03-03 |
| ATA861075A (en) | 1977-04-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2457339B1 (en) | ||
| SE7603166L (en) | OPERATION OF BLEACHING FACILITY | |
| ES425711A1 (en) | Treatment of lignocellulosic material in an alkaline pulping liquor containing anthraquinone sulphonic acid followed by oxygen delignification | |
| FR2265908A1 (en) | Kraft pulp bleaching and recovery process - using alkali extraction effluents in subsequent bleaching steps | |
| DE68914135D1 (en) | Process for bleaching pulp. | |
| GB1544216A (en) | Bleaching and digesting cellulosic pulp | |
| ES8704569A1 (en) | Sulphite pulping process for preparing cellulose pulp from lignocellulosic materials with recovery of the pulping chemicals. | |
| KR830007942A (en) | Extraction and Bleaching of Woven Fabrics by a Single Process Using a Treatment Solution Containing Hydrogen Peroxide | |
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| US2364177A (en) | Manufacture of bleached kraft pulp | |
| Nishida et al. | STUDIES ON OXYGEN-ALKALI TREATMENT OF LIGNEOUS MATERIALS. PART V. RECYCLE AND REUSE OF WASTE LIQUOR IN O-PA-P BLEACHING SEQUENCE(IN JAPANESE) | |
| GB1062734A (en) | Improvements in or relating to bleaching cellulose pulp | |
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| FR2328765A1 (en) | Acyl nitrile peroxide bleach activators - are more effective at low temps. and do not fade the fabric colour | |
| Akim et al. | REDUCTION OF EFFLUENT VOLUME AND FRESH WATER CONSUMPTION(SNIZHENIE OB'EMA CTOCHNYKH VOD I RASKHODA SVEZHEJ VODY) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |