SE7602842L - BLEACHING OF CELLULOSA WITH SIGNIFICANTLY REDUCED CHLORINE AMOUNT - Google Patents
BLEACHING OF CELLULOSA WITH SIGNIFICANTLY REDUCED CHLORINE AMOUNTInfo
- Publication number
- SE7602842L SE7602842L SE7602842A SE7602842A SE7602842L SE 7602842 L SE7602842 L SE 7602842L SE 7602842 A SE7602842 A SE 7602842A SE 7602842 A SE7602842 A SE 7602842A SE 7602842 L SE7602842 L SE 7602842L
- Authority
- SE
- Sweden
- Prior art keywords
- bleaching
- cellulosa
- significantly reduced
- effluent
- chlorine amount
- 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
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 |
---|---|
SE7602842L true SE7602842L (en) | 1977-03-01 |
Family
ID=5955230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7602842A SE7602842L (en) | 1975-08-30 | 1976-02-27 | BLEACHING OF CELLULOSA WITH SIGNIFICANTLY REDUCED CHLORINE AMOUNT |
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) |
Families Citing this family (6)
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. |
ES2038097T5 (en) * | 1989-06-06 | 2001-05-01 | Eka Chemicals Ab | PROCEDURE FOR WHITENING PAPER PASTES CONTAINING LIGNOCELLULOSE. |
SE466061B (en) * | 1990-04-23 | 1991-12-09 | Eka Nobel Ab | Bleaching of chemical pulp by treatment with first a complexing agent and then a peroxide containing substance |
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
Also Published As
Publication number | Publication date |
---|---|
AT340765B (en) | 1978-01-10 |
FI62869C (en) | 1983-03-10 |
FI62869B (en) | 1982-11-30 |
FR2322235A1 (en) | 1977-03-25 |
ES443318A1 (en) | 1977-05-01 |
FR2322235B1 (en) | 1979-04-06 |
CA1080406A (en) | 1980-07-01 |
CH620002A5 (en) | 1980-10-31 |
ZA757822B (en) | 1976-11-24 |
YU37370B (en) | 1984-08-31 |
BR7603006A (en) | 1977-05-31 |
YU301275A (en) | 1983-04-27 |
NL7513942A (en) | 1977-03-02 |
NO145344B (en) | 1981-11-23 |
IT1055792B (en) | 1982-01-11 |
FI753314A (en) | 1977-03-01 |
BE836462R (en) | 1976-06-09 |
DE2538673C2 (en) | 1986-01-16 |
DE2538673A1 (en) | 1977-03-03 |
GB1544216A (en) | 1979-04-19 |
AR221678A1 (en) | 1981-03-13 |
ATA861075A (en) | 1977-04-15 |
NO754077L (en) | 1977-03-01 |
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