EP0087553B1 - Procédé de fabrication de pâtes cellulosiques semi-blanchies - Google Patents
Procédé de fabrication de pâtes cellulosiques semi-blanchies Download PDFInfo
- Publication number
- EP0087553B1 EP0087553B1 EP83100115A EP83100115A EP0087553B1 EP 0087553 B1 EP0087553 B1 EP 0087553B1 EP 83100115 A EP83100115 A EP 83100115A EP 83100115 A EP83100115 A EP 83100115A EP 0087553 B1 EP0087553 B1 EP 0087553B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oxygen
- pulp
- bleaching
- peroxide
- sodium silicate
- 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
-
- 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
- D21C9/1068—Bleaching ; Apparatus therefor with O2
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- Semi-bleached pulps have whiteness levels that lie between unbleached and highly bleached pulp.
- Commercial ,. highly bleached pulps have a white content of 88 to more than 90% Elrepho (R457).
- Bleached and semi-bleached pulps affect the range between unbleached (20 to 30% Elrepho for sulfate pulps, 50 to 60% Elrepho for sulfite pulps) and approx. 80 to 88% Elrepho.
- DE-A2 040 763 discloses a process for bleaching cellulose-containing substances and for removing lignin, in which at least one bleaching stage is used in addition to oxygen-alkali bleaching using water glass stabilized peroxide.
- the application relates to a process for the production of semi-bleached pulps using oxygen excess pressure, hydrogen peroxide and sodium silicate in an aqueous alkaline suspension, characterized in that oxygen, hydrogen peroxide and sodium silicate are allowed to act simultaneously on the pulp for bleaching and partial delignification.
- the process according to the invention is particularly suitable for bleaching hardwood and softwood sulfite and sulfate pulp to a white content of 40 to 80% (Elrepho R 457).
- the process according to the invention enables a marked reduction in the use of peroxide with comparable results in terms of whiteness, yield and strength.
- a pulp is obtained which, in addition to a high lignin content, has a high degree of whiteness, with no reduction in the yield.
- a particularly simple type of application on an industrial scale is the combination of an oxygen and alkali mixture with a medium consistency with an optionally directly subsequent mixture of hydrogen peroxide and sodium silicate.
- the oxygen can be added via a refiner. During the short dwell time of the material flow when pumping up to the bleaching tower in a tube, oxygen becomes a partial delignification and an oxidation of the peroxide-consuming, dissolved organic substances. If the pulp is then left to react in one of the usual downward working towers, considerably less peroxide is required to achieve the same white content as without the addition of oxygen. A temporal separation of the oxygen and peroxide addition is also possible. Peroxide can only be added to the oxygen-pretreated pulp directly before the tower entrance.
- the oxygen mixer can be used to work directly into an upward tower.
- the working pressure in this application is 2 to 4 bar.
- the process according to the invention reduces the peroxide requirement by more than 30%. Since the advantages of bleaching with peroxide, high yield, low wastewater pollution and good strength values are retained, the cost-effectiveness of the process is considerably enhanced by the use of inexpensive oxygen.
- Pine sulfate pulp should be bleached to a whiteness of> 50 in one stage.
- Pine sulfate pulp should be bleached to a whiteness level of around 70 (R 457) in one step. This is not possible using the known bleaching process with only one peroxide stage. White contents 55 cannot be achieved from the starting whites 23, 4 and with a kappa number of 37.
- This pulp is ideally suited for use as a pulp component in newspaper, magazines and LWC papers. It was not only in the bleaching in comparison to conventional bleaching processes such.
- B. CEH achieved a 4% higher bleaching yield, but also a 50% lower waste water pollution. The latter also contains no chlorinated compounds.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83100115T ATE21133T1 (de) | 1982-02-27 | 1983-01-08 | Verfahren zur herstellung von halbgebleichten zellstoffen. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3207157A DE3207157C1 (de) | 1982-02-27 | 1982-02-27 | Verfahren zur Herstellung von halbgebleichten Zellstoffen |
DE3207157 | 1982-02-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0087553A1 EP0087553A1 (fr) | 1983-09-07 |
EP0087553B1 true EP0087553B1 (fr) | 1986-07-30 |
Family
ID=6156909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83100115A Expired EP0087553B1 (fr) | 1982-02-27 | 1983-01-08 | Procédé de fabrication de pâtes cellulosiques semi-blanchies |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0087553B1 (fr) |
AT (1) | ATE21133T1 (fr) |
DE (2) | DE3207157C1 (fr) |
FI (1) | FI824295L (fr) |
NO (1) | NO824357L (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3428352A1 (de) * | 1984-08-01 | 1986-02-13 | Degussa Ag, 6000 Frankfurt | Verfahren zur delignifizierung und bleiche von zellstoffen |
DE3446301A1 (de) * | 1984-12-19 | 1986-06-19 | Degussa Ag, 6000 Frankfurt | Verfahren zur delignifizierung von sulfatzellstoffen |
CA1251903A (fr) * | 1985-06-17 | 1989-04-04 | Pulp And Paper Research Institute Of Canada | Traitement des pates chimiques non blanchies et chlorees, par recours a un agent alcalin, au peroxyde et a l'oxygene |
US5011572A (en) * | 1989-05-19 | 1991-04-30 | Fmc Corporation | Two stage process for the oxygen delignification of lignocellulosic fibers with peroxide reinforcement in the first stage |
ES2050278T3 (es) * | 1990-01-05 | 1994-05-16 | Praxair Technology Inc | Blanqueo de textiles con oxigeno y peroxido de hidrogeno. |
ZA924351B (en) * | 1991-06-27 | 1993-03-31 | Ahlstroem Oy | Ozone bleaching process |
BE1005800A3 (fr) * | 1992-05-22 | 1994-02-01 | Solvay Interox | Procede pour la delignification et le blanchiment d'une pate a papier chimique. |
FI925159A0 (fi) * | 1992-11-13 | 1992-11-13 | Ahlstroem Oy | Foerfarande foer blekning av massa |
SE9301960L (sv) * | 1993-06-08 | 1994-07-25 | Kvaerner Pulping Tech | Blekning av kemisk massa med peroxid vid övertryck |
WO1995018260A1 (fr) * | 1993-12-28 | 1995-07-06 | Mauvin Material And Chemical Processing Limited | Procede de delignification de matieres vegetales ligno-cellulosiques vierges et usees a des fins de production de fibres cellulosiques, de sucres libres et de produits derives de lignine |
FR2719854B1 (fr) * | 1994-05-11 | 1996-06-21 | Atochem Elf Sa | Procédé de préparation de pâtes à papier chimiques délignifiées et blanchies. |
ZA955190B (en) * | 1994-07-11 | 1996-03-14 | Ingersoll Rand Co | Method for bleaching wood pulp using hydrogen peroxide |
EP0866895B1 (fr) * | 1995-12-07 | 2000-06-14 | Beloit Technologies, Inc. | Delignification par de l'oxygene d'une pate a papier de consistance moyenne |
DE19751173A1 (de) * | 1997-11-19 | 1999-05-27 | Voith Sulzer Papiertech Patent | Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff |
RU2744339C1 (ru) * | 2020-07-20 | 2021-03-05 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Способ отбелки сульфитной целлюлозы |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE324285B (fr) * | 1968-11-22 | 1970-05-25 | T Norin | |
FI45574C (fi) * | 1970-05-11 | 1972-07-10 | Kymin Oy Kymmene Ab | Menetelmä selluloosapitoisten aineiden valkaisemiseksi. |
US3832276A (en) * | 1973-03-07 | 1974-08-27 | Int Paper Co | Delignification and bleaching of a cellulose pulp slurry with oxygen |
JPS5138508A (en) * | 1974-09-25 | 1976-03-31 | Harusuke Hayashi | Parupuno sansosankaseisei niokeru hogozai |
US3951733A (en) * | 1974-11-06 | 1976-04-20 | International Paper Company | Delignification and bleaching of wood pulp with oxygen |
-
1982
- 1982-02-27 DE DE3207157A patent/DE3207157C1/de not_active Expired
- 1982-12-14 FI FI824295A patent/FI824295L/fi not_active Application Discontinuation
- 1982-12-23 NO NO824357A patent/NO824357L/no unknown
-
1983
- 1983-01-08 EP EP83100115A patent/EP0087553B1/fr not_active Expired
- 1983-01-08 AT AT83100115T patent/ATE21133T1/de not_active IP Right Cessation
- 1983-01-08 DE DE8383100115T patent/DE3364788D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FI824295L (fi) | 1983-08-28 |
ATE21133T1 (de) | 1986-08-15 |
DE3364788D1 (en) | 1986-09-04 |
NO824357L (no) | 1983-08-29 |
DE3207157C1 (de) | 1983-06-09 |
FI824295A0 (fi) | 1982-12-14 |
EP0087553A1 (fr) | 1983-09-07 |
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