EP0087553B1 - Procédé de fabrication de pâtes cellulosiques semi-blanchies - Google Patents

Procédé de fabrication de pâtes cellulosiques semi-blanchies Download PDF

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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
Application number
EP83100115A
Other languages
German (de)
English (en)
Other versions
EP0087553A1 (fr
Inventor
Horst Dr. Krüger
Hans Ulrich Dr. Süss
Kurt Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6156909&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0087553(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to AT83100115T priority Critical patent/ATE21133T1/de
Publication of EP0087553A1 publication Critical patent/EP0087553A1/fr
Application granted granted Critical
Publication of EP0087553B1 publication Critical patent/EP0087553B1/fr
Expired legal-status Critical Current

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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)

1. Procédé pour la fabrication de celluloses semi-blanchies, avec utilisation d'une surpression d'oxygène, de peroxyde d'hydrogène et de silicate de sodium, dans une suspension alcaline aqueuse, caractérisé en ce que l'on fait agir simultanément sur la cellulose de l'oxygène, du peroxyde d'hydrogène et du silicate de sodium, pour le blanchiment et la délignification partielle.
2. Procédé suivant la revendication 1, caractérisé en ce que l'on observe une densité de matière de 10 à 30 %, une température de 50 à 110 °C, une pression d'oxygène de 1 à 10 bars, une proportion de peroxyde d'hydrogène de 0,25 à 3 %, une proportion de soude caustique de 1 à 5 %, et une proportion de silicate de sodium de 1 à 6 %.
3. Procédé suivant la revendication 1, caractérisé en ce qu'après l'introduction de l'oxygène dans le mélange, on laisse s'écouler un temps de séjour pouvant aller jusqu'à 60 minutes.
EP83100115A 1982-02-27 1983-01-08 Procédé de fabrication de pâtes cellulosiques semi-blanchies Expired EP0087553B1 (fr)

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
DE3207157 1982-02-27
DE3207157A DE3207157C1 (de) 1982-02-27 1982-02-27 Verfahren zur Herstellung von halbgebleichten Zellstoffen

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)

* Cited by examiner, † Cited by third party
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
DE69007267T2 (de) * 1990-01-05 1994-06-16 Praxair Technology Inc Bleichen von Textilien mit Sauerstoff und Wasserstoffperoxid.
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
SE500616C2 (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
ATE193912T1 (de) * 1995-12-07 2000-06-15 Beloit Technologies Inc Delignifizierung eines papierzellstoffs mittlerer konsistenz mittels sauerstoff
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
NO824357L (no) 1983-08-29
DE3207157C1 (de) 1983-06-09
DE3364788D1 (en) 1986-09-04
FI824295A0 (fi) 1982-12-14
ATE21133T1 (de) 1986-08-15
FI824295L (fi) 1983-08-28
EP0087553A1 (fr) 1983-09-07

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