EP0120132B1 - Procédé de blanchiment de matières premières de papier - Google Patents

Procédé de blanchiment de matières premières de papier Download PDF

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Publication number
EP0120132B1
EP0120132B1 EP83112505A EP83112505A EP0120132B1 EP 0120132 B1 EP0120132 B1 EP 0120132B1 EP 83112505 A EP83112505 A EP 83112505A EP 83112505 A EP83112505 A EP 83112505A EP 0120132 B1 EP0120132 B1 EP 0120132B1
Authority
EP
European Patent Office
Prior art keywords
bleaching
process according
bleached
dithionite
whiteness
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
EP83112505A
Other languages
German (de)
English (en)
Other versions
EP0120132A1 (fr
Inventor
Hans-Ulrich Dr. Süss
Horst Dr. Krüger
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
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to AT83112505T priority Critical patent/ATE23376T1/de
Publication of EP0120132A1 publication Critical patent/EP0120132A1/fr
Application granted granted Critical
Publication of EP0120132B1 publication Critical patent/EP0120132B1/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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds

Definitions

  • the invention relates to a method for bleaching paper raw materials such as wood pulp, thermomechanical and chemothermomechanical wood pulp (generally referred to as TMP or CTMP) and waste paper.
  • TMP thermomechanical and chemothermomechanical wood pulp
  • a two-stage process makes economic sense for bleaching to very high whiteness levels.
  • the state of the art here is bleaching with hydrogen peroxide and then dithionite treatment.
  • the disadvantage of this method is the high capital requirement for the necessary installations, e.g. High thickener, thick matter mixer and tower for peroxide bleaching and other aggregates for dithionite bleaching.
  • thermomechanical or chemothermomechanical wood pulp With thermomechanical or chemothermomechanical wood pulp, the effectiveness of the dithionite is significantly reduced. Obviously, the high temperature load in the refiner creates condensation products from the lignin of the wood, which cannot be reduced with discolouration using dithionite. In addition, there is a reduction in the basic white content.
  • thiourea dioxide for bleaching wood pulps with a low cellulose content, preferably in combination with sodium bisulfite (Na 2 S 2 O 5 ).
  • the pH range from 5.5 to 8.0 is considered to be appropriately described.
  • US-A-3 481 828 relates to improving the effectiveness of thiourea dioxide (formamidine sulfinic acid) in bleaching by adding zinc salts.
  • the application relates to a process for reducing bleaching of paper raw materials such as wood pulp, TMP and CTMP and waste paper at a temperature of 50-130 ° C., preferably 70-100 ° C. and a consistency of 2-20% by weight, preferably 3-6% by weight %, a residence time of 1 - 120 min, preferably 2 - 60 min, in an alkaline, aqueous slurry with formamidine sulfinic acid, which is characterized in that the pH at the beginning of the bleaching reaction is between 9.7 and 12, preferably between 10 , 3 and 10.6, and after completion between 7 and ⁇ 9. preferably between 7.1 and 8.5.
  • the concentration of formamidine sulfinic acid is 0.05-3% by weight, preferably 0.25-1.5% by weight, based on the substance.
  • thermomechanical TMP
  • CTMP chemothermomechanical
  • a complexing agent e.g. DTPA (di-alkylene-triaminepenta-acetic acid) treated.
  • TMP and CTMP can be bleached with formamidine sulfinic acid during the passage through the refiner without the need for additional equipment, even at the elevated temperatures prevailing there.
  • the normal residence time in the refiner is generally sufficient for a good bleaching effect. If a two-stage refiner is used, it is advisable to bleach in the second stage.
  • Pretreatment of the wood chips with sodium sulfite and sodium hydroxide solution or sodium bisulfite when producing TMP or CTMP does not prevent bleaching with formamidine sulfinic acid.
  • a special washing stage is not necessary.
  • bleaching with formamidine sulfinic acid can be carried out in an alkaline medium in a grinder. If waste paper is used as a raw material, it is advisable to bleach during the flotation-de-inking process, which takes place according to the rules of technology, before flotation.
  • the process according to the invention can be carried out either alone or in combination with conventional bleaching processes.
  • dithionite bleaching can be added to the process according to the invention or the process according to the invention can be repeated again to increase the white content.
  • TMP made from spruce wood chips with a base whiteness of 53.0% remission and pretreated with 0.5% DTPA is treated with 1.2% Na 2 S 2 O 4 (all quantities on dry matter) at 5% consistency, pH 5.5, 70 ° C, 1 hour residence time and bleached to a whiteness of 60.9% remission under an N 2 atmosphere.
  • a whiteness of 61.5 is achieved with only 0.5% formamidine sulfinic acid and 0.4% NaOH, the initial pH being 10.5 and the final pH 7.8.
  • the white content of the TMP can even be increased to 65.9% remission.
  • Wood pulp bleach with dithionite Wood pulp bleach with dithionite
  • Spruce wood sanding with a base whiteness of 62.8% remission is brought to 71.8 by 1% Na 2 S 2 0 4 at pH 5.5, 70 ° C, 4.5% consistency and 1 hour residence time % Remission brightened.
  • 1% formamidine sulfinic acid and 0.6% NaOH With 1% formamidine sulfinic acid and 0.6% NaOH, a whiteness of 76.1 is accessible from an initial pH of 10.4. The final pH is 7.7.
  • the formamidine sulfinic acid can advantageously be used to further increase the whiteness of a wood pulp pre-bleached with dithionite. A washing stage is not necessary.
  • the bleaching sequence of dithionite-formamidine sulfinic acid thus offers one of the whiteness levels beyond the level accessible with dithionite. As with peroxide-dithionite bleaching, this does not have to involve a considerable amount of equipment.
  • Spruce wood with a basic whiteness of 64.3% remission is pretreated in the grinding circuit with 0.3% DTPA and then at pH 5.5, 65 ° C, 4.5% consistency and 1 hour residence time with 1.3% Na 2 S 2 O 4 bleached.
  • the result is a - white content of 71.9% remission.
  • the pH of the pulp slurry is raised to 10.6 with 0.5% NaOH and formamidine sulfinic acid (0.5%) is added at the same time. The consistency drops to 4.2%. After 90 minutes the pH of the stock suspension is 7.5 and the whiteness has risen to 75.3% remission.
  • a mixture of 30% pine and 70% spruce wood chips is impregnated with 1.5% sodium hydroxide solution and 2% sodium sulfite and ground in a two-stage refiner system.
  • a CTMP with a white content of 57.6% remission is obtained. If you add 1% formamidine sulfinic acid to the stream from the second refiner stage, the final whiteness is 68.3% remission.
  • a mixture of 30% pine and spruce wood chips provides TMP with a whiteness of 54.8 without the use of additional chemicals. If, on the other hand, 0.8% sodium hydroxide solution and 1.2% formamidine sulfinic acid are mixed in before the second refiner stage (pH: 10.3), a whiteness of 66.5% remission is obtained at a final pH of 7.5. After thickening to 20% consistency, a final whiteness of 77.3% remission is achieved with 1.5% H 2 O 2 , 1.0% NaOH and 3.5% water glass at 60 ° C after a dwell time of 2 hours.
  • a mixture of newspapers and magazines (1: 1) with a white content of 44% remission is mixed with 0.8% sodium hydroxide solution, 0.5% soap (Serfax), 0.1% dispersant (lame ink) and 0.2% DTPA and 0.5% formamidine sulfinic acid at 5% consistency and 60 ° C.
  • the pH is 9.8. After an hour's stay, the pH value drops to 7.7. It is diluted to 2% consistency, deflated and floated at 1% consistency. After thickening and acidification, the de-intact fabric reaches a white content of 62.5% remission.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)

Claims (9)

1°) Procédé pour le blanchiment de matières premières pour papier avec de l'acide formamidinesulfinique, à une température de 50 à 130° C, une densité de matière de 2 à 20 % en poids et une durée de sejour de 1 à 120 minutes, dans un empâtage aqueux alcalin, procédé caractérisé en ce que la valeur du pH se situe au commencement de la réaction de blanchiment entre 9.7 et 12, et après son achèvement entre 7 et < 9.
2°) Procédé suivant la revendication 1, caractérisé en ce que l'on traite la matière première pour papier avant le blanchiment avec 0,01 à 1 % en poids d'un agent complexant.
3°) Procédé suivant les revendications 1 et 2, caractérisé en ce que l'on blanchit une pâte à papier thermomécanique (TMP), ou chimiothermomécanique (CTMP), dans un raffineur.
4°) Procédé suivant les revendications 1 et 2, caractérisé en ce que l'on blanchit la pâte de bois dans un défibreur.
5°) Procédé suivant les revendications 1 et 2, caractérisé en ce que l'on blanchit la TMP et la pâte mécanique dans une tour de blanchiment.
6°) Procédé suivant la revendication 1, caractérisé en ce que l'on blanchit le papier de récupération pendant l'opération de flottation et de lavage-désencrage.
7°) Procédé suivant les revendications 1 à 6, caractérisé en ce que l'on fait suivre d'une seconde étape de blanchiment avec du peroxyde ou de l'hyposulfite ou de l'acide formamidinesulfinique.
8°) Procédé suivant les revendications 1, 2 et 3, caractérisé en ce qu'on le fait précéder d'un blanchiment de la matière première pour papier avec du peroxyde.
9°) Procédé suivant les revendications 1, 2 et 3, caractérise en ce qu'on le fait précéder du blanchiment de la matière pour papier, avec de l'hypofulsite.
EP83112505A 1983-03-19 1983-12-13 Procédé de blanchiment de matières premières de papier Expired EP0120132B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83112505T ATE23376T1 (de) 1983-03-19 1983-12-13 Verfahren zum bleichen von papierrohstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3309956A DE3309956C1 (de) 1983-03-19 1983-03-19 Verfahren zum Bleichen von Papierrohstoffen
DE3309956 1983-03-19

Publications (2)

Publication Number Publication Date
EP0120132A1 EP0120132A1 (fr) 1984-10-03
EP0120132B1 true EP0120132B1 (fr) 1986-11-05

Family

ID=6194000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83112505A Expired EP0120132B1 (fr) 1983-03-19 1983-12-13 Procédé de blanchiment de matières premières de papier

Country Status (3)

Country Link
EP (1) EP0120132B1 (fr)
AT (1) ATE23376T1 (fr)
DE (2) DE3309956C1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616816A1 (de) * 1986-05-17 1987-11-19 Degussa Verfahren zum entfaerben von in der masse gefaerbten papieren und selbstdurchschreibepapieren
DE3831668A1 (de) * 1988-09-17 1990-03-22 Escher Wyss Gmbh Verfahren zur weissgraderhoehung von altpapier mit neutralem wasserkreislauf
DE3902423A1 (de) * 1989-01-27 1990-08-02 Degussa Verfahren zur bleiche von faserstoffen zur papierherstellung
GB9214041D0 (en) * 1992-07-02 1992-08-12 Morton Int Inc Process for de-inking recycled paper pulp
AT407762B (de) * 1994-03-22 2001-06-25 Brueggemann L Kg Bleichmittel zur bleiche von sekundärfaserstoffen für die papierherstellung
DE19920338A1 (de) * 1999-05-03 2000-11-16 Voith Sulzer Papiertech Patent Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff
DE102007007654A1 (de) * 2007-02-13 2008-08-14 Voith Patent Gmbh FAS Bleiche
WO2017210628A1 (fr) 2016-06-02 2017-12-07 Priefert Mfg. Co. Inc. Appareil, systèmes et procédés pour un joint brasé
DE102020111675A1 (de) * 2020-04-29 2021-11-04 Kübler & Niethammer Papierfabrik Kriebstein AG Verfahren zur Herstellung eines Etikettenpapiers aus abgelösten Nassetiketten

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3384534A (en) * 1964-12-16 1968-05-21 Fmc Corp Bleaching of wood pulps with thiourea dioxide
GB1404315A (en) * 1971-09-15 1975-08-28 Albright & Wilson Production of bleached high yield pulp
DE3118192A1 (de) * 1981-05-08 1982-11-25 Basf Ag, 6700 Ludwigshafen Verfahren zum deinken von altpapier

Also Published As

Publication number Publication date
EP0120132A1 (fr) 1984-10-03
ATE23376T1 (de) 1986-11-15
DE3367421D1 (en) 1986-12-11
DE3309956C1 (de) 1984-07-12

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