EP0191756A1 - Mehrstufige Peroxidbleiche einer mechanischen Pulpe - Google Patents

Mehrstufige Peroxidbleiche einer mechanischen Pulpe Download PDF

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Publication number
EP0191756A1
EP0191756A1 EP86890030A EP86890030A EP0191756A1 EP 0191756 A1 EP0191756 A1 EP 0191756A1 EP 86890030 A EP86890030 A EP 86890030A EP 86890030 A EP86890030 A EP 86890030A EP 0191756 A1 EP0191756 A1 EP 0191756A1
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EP
European Patent Office
Prior art keywords
pulp
bleaching
peroxide
hydrosulfite
mechanical
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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.)
Granted
Application number
EP86890030A
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English (en)
French (fr)
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EP0191756B1 (de
Inventor
Petter Tibbling
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Metso Fiber Karlstad AB
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Kamyr AB
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Priority to AT86890030T priority Critical patent/ATE39714T1/de
Publication of EP0191756A1 publication Critical patent/EP0191756A1/de
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Publication of EP0191756B1 publication Critical patent/EP0191756B1/de
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    • 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

Definitions

  • Typical conventional bleaching sequences for the bleaching of mechanical pulps such as mechanical pulp, chemimechanical pulp (CMP), thermomechanical pulp (TMP) and chemithermomechanical pulp (CTMP) comprise peroxide (P), hydrosulfite (T), or P-T sequences.
  • Reductive bleaching with hydrosulfites is also commonly practiced in a single stage.
  • a P-T bleaching sequence which gives brightness in the range of about 74-78% ISO.
  • the contribution to brightness of the final T stage is gradually reduced as the charge of peroxide is increased in order to boost final brightness.
  • the T stage does produce a substantial brightening effect, on the order of 2-4 ISO units.
  • the contribution from the hydrosulfite stage is very small (less than 2 ISO units) at the 80+ ISO level.
  • a method of obtaining high brightness lignocellulose pulp comprising the steps of (a) subjecting a mechanical lignocellulose pulp to a first peroxide bleaching; (b) subjecting the mechanical pulp to a second peroxide bleaching sequence; and (c) subjecting the mechanical pulp to a hydrosulfite bleaching sequence. More than two peroxide stages may be provided, and the steps (a)-(c) preferably practiced sequentially. Preferably the pulp is pressed between the stages to partially remove interstitial pulp liquor. This removed liquor (filtrate) is normally reused for dilution in preceeding stages, or for chemical recovery.
  • the pulp maintains a consistency of between about 8-50%, although after pressing it is typically diluted (e.g. to between 8-15%). During each actual bleaching stage the consistency is between about 8-30%.
  • the invention also relates to a mechanical pulp having high brightness, and produced by the practice of steps (a) through (c). According to the invention, a mechanical pulp is produced having a brightness of about 83% ISO (or greater).
  • FIGURE 1 illustrates the production of a mechanical pulp in a typical mechanical pulping process station 10, which includes the use of refiners, and other pulping process stages as desired.
  • a mechanical lignocellulose pulp is produced in station 10, it is subjected to a first sodium or hydrogen peroxide bleaching P 1 , as indicated by reference numeral 12 in FIGURE 1.
  • Peroxide bleaching is accomplished utilizing conventional equipment, and conventional bleaching conditions for peroxide bleaching of mechanical pulps (e.g. 45-90°C, 15-240 minutes)
  • a typical form such equipment can take is illustrated schematically in FIGURE 3 wherein the pulp is fed to a mixer 14, the peroxide, sodium hydroxide, and buffering and stabilizing agents or the like (such as sodium silicate and MgS0 4 ) are added.
  • the consistency of the pulp may be increased in screw press 15, and ultimately the pulp is fed to bleaching tower 16.
  • Bleaching would typically be accomplished at a consistency of about 8-30%, preferably about 12-25%.
  • the pulp is passed to the second peroxide stage P 2' indicated by reference numeral 18 in FIGURE 1. There it is subjected to another typical peroxide bleaching sequence.
  • Other peroxide bleaching sequences after stage 12 e.g. P 3 , P 4 , etc. may be provided.
  • FIGURE 2 wherein a press station 19 is disposed between the peroxide bleaching sequence stages 12, 18.
  • press station 19 the pulp is pressed to a high consistency (e.g. on the order of 30-50%) before the bleach liquid for the subsequent peroxide stage 18 is added.
  • pressing in press station 19' preferably is practiced after stage 18.
  • the pulp is subjected to a hydrosulfite bleaching, as illustrated schematically by reference numeral 20 in FIGURE 1.
  • the conditions in the hydrosulfite bleaching stage 20 are conventional (e.g. 45-90°C, 10-60 min.) except that it is preferred that the bleaching be practiced with a pulp consistency of between about 8-30%, preferably between about 8-15%.
  • Hydrosulfite bleaching of medium consistency mechanical pulps is illustrated in copending U.S. patent application Serial No. 589,938 filed March 5, 1984, and the equipment and processes illustrated therein may be utilized in the practice of bleaching 20.
  • FIGURE 4 schematically illustrates one form of the typical equipment that could be utilized in the practice of stage 20, wherein the pulp, after having been pressed and diluted to about 8-15% consistency, is mixed with hydrosulfite and other chemicals, such as buffering, chelating, and sequestering agents.
  • the pulp is fluidized by the mixer 22; and then passes to conventional upflow tower 24.
  • the bleached mechanical pulp produced according to the sequence illustrated in FIGURE 1 has high brightness; brightness on the order of about 83% ISO units, or more, can be achieved. Almost as high a brightness can be achieved if a peroxide stage is utilized both before and after a hydrosulfite stage. This is shown schematically in FIGURE 5 wherein T stage 20' is between P 1 stage 12' and P 2 stage 18'.
  • T stage 20' is between P 1 stage 12' and P 2 stage 18'.
  • a P-T sequence was practiced on unbleached CTMP pulp having 53.5% ISO, 160/110 (cold/hot) ml C.S.F. (millimeters, Canadian Standard Freeness) containing 0.4% DCM-extract (a measure of the amount of resin), 92 ppm manganese, and 9 ppm iron.
  • the pulp was pretreated with 0.2% DTPA on bone dry (BD) pulp at 3% consistency and 60°C.
  • the temperature in both the P and T stages was 80°C, and the pulp consistency was 15% in both stages.
  • the treatment time in the peroxide stage was 180 minutes using 3% sodium silicate and 0.2% MgS0 4 for buffering and stabilizing the peroxide liquid.
  • the reaction time was 30 minutes, using 1% hydrosulfite which was all consumed. The following results were obtained:
  • the pulp was pressed and the pH was reduced by the addition of S0 2 water, the reduction practiced so that the pH was about 5.5-6.0 just prior to the hydrosulfite stage, and the pulp was diluted as necessary in order to maintain the consistency throughout the actual bleaching stages at about 15%.
  • hydrosulfite stage was between two peroxide stages (see FIG. 5).
  • the pulp, and general conditions, were the same as for Example 2, with the following results:

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Joints Allowing Movement (AREA)
  • Springs (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Liquid Crystal Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Electron Beam Exposure (AREA)
EP86890030A 1985-02-15 1986-02-12 Mehrstufige Peroxidbleiche einer mechanischen Pulpe Expired EP0191756B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86890030T ATE39714T1 (de) 1985-02-15 1986-02-12 Mehrstufige peroxidbleiche einer mechanischen pulpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70200085A 1985-02-15 1985-02-15
US702000 1985-02-15

Publications (2)

Publication Number Publication Date
EP0191756A1 true EP0191756A1 (de) 1986-08-20
EP0191756B1 EP0191756B1 (de) 1989-01-04

Family

ID=24819495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86890030A Expired EP0191756B1 (de) 1985-02-15 1986-02-12 Mehrstufige Peroxidbleiche einer mechanischen Pulpe

Country Status (8)

Country Link
EP (1) EP0191756B1 (de)
JP (1) JPS61245392A (de)
AT (1) ATE39714T1 (de)
BR (1) BR8600637A (de)
DE (1) DE3661641D1 (de)
FI (1) FI85729C (de)
NO (1) NO166244C (de)
SE (1) SE8600615L (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878998A (en) * 1986-10-20 1989-11-07 Eka Nobel Ab Method for controlling peroxide bleaching in a plurality of bleaching stages
WO1990011403A1 (en) * 1989-03-23 1990-10-04 Hymac Ltd. Bleaching process for the production of high bright pulps
WO1992007139A1 (fr) * 1990-10-17 1992-04-30 Interox International S.A. Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques
US5464501A (en) * 1993-04-06 1995-11-07 Societe Anonyme Pour L'etude Et L'exploitation L'air Liquide, Des Procedes Georges Claude Bleaching recycled pulp with a reductive-oxidative sequence
US5562803A (en) * 1992-06-18 1996-10-08 Morton International, Inc. Sequential bleaching of de-inked paper pulp with sodium bisulfite, dithionite and borohydride
WO1999029779A1 (en) * 1997-12-10 1999-06-17 Fausto De Donato Composition for bleaching woodpulp and process for its production
EP1418269A1 (de) * 2002-11-05 2004-05-12 Rohm And Haas Company Verfahren zum Bleichen von mechanischer Pulpe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622221A1 (fr) * 1987-10-22 1989-04-28 Atochem Procede de blanchiment de pates
FR2639371B1 (fr) * 1988-11-24 1995-04-14 Atochem Procede de blanchiment de pates desencrees
JPH076148B2 (ja) * 1989-06-27 1995-01-30 新王子製紙株式会社 リグノセルロース物質の漂白方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820502A (en) * 1928-06-30 1931-08-25 Champion Fibre Company Bleaching cellulose pulp
US2290601A (en) * 1940-02-16 1942-07-21 Du Pont Bleaching of ground wood pulp with preliminary bisulphite treatment
US2862784A (en) * 1955-03-04 1958-12-02 Virginia Smelting Company Oxidative-reductive multi-stage bleaching of ground wood pulp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5679798A (en) * 1979-12-03 1981-06-30 Mitsubishi Gas Chemical Co Production of bleaching machine pulp
JPS575992A (en) * 1980-06-04 1982-01-12 Mitsubishi Gas Chemical Co Bleaching of high yield pulp by peroxide
CA1249402A (en) * 1984-12-21 1989-01-31 Pulp And Paper Research Institute Of Canada Multistage brightening of high yield and ultra high- yield wood pulps

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820502A (en) * 1928-06-30 1931-08-25 Champion Fibre Company Bleaching cellulose pulp
US2290601A (en) * 1940-02-16 1942-07-21 Du Pont Bleaching of ground wood pulp with preliminary bisulphite treatment
US2862784A (en) * 1955-03-04 1958-12-02 Virginia Smelting Company Oxidative-reductive multi-stage bleaching of ground wood pulp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAPPI, vol. 53, no. 12, December 1970, pages 2275-2277, Atlanta, GA, US; C.A. RICHARDSON et al.: "Two-stage bleaching of high-yield pulp at blandin" *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878998A (en) * 1986-10-20 1989-11-07 Eka Nobel Ab Method for controlling peroxide bleaching in a plurality of bleaching stages
WO1990011403A1 (en) * 1989-03-23 1990-10-04 Hymac Ltd. Bleaching process for the production of high bright pulps
WO1992007139A1 (fr) * 1990-10-17 1992-04-30 Interox International S.A. Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques
BE1004630A3 (fr) * 1990-10-17 1992-12-22 Interox Internat Sa Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques.
US5534115A (en) * 1990-10-17 1996-07-09 Interox International (Societe Anonyme) Process for preserving the mechanical strength properties of chemical paper pulps
US5562803A (en) * 1992-06-18 1996-10-08 Morton International, Inc. Sequential bleaching of de-inked paper pulp with sodium bisulfite, dithionite and borohydride
US5464501A (en) * 1993-04-06 1995-11-07 Societe Anonyme Pour L'etude Et L'exploitation L'air Liquide, Des Procedes Georges Claude Bleaching recycled pulp with a reductive-oxidative sequence
WO1999029779A1 (en) * 1997-12-10 1999-06-17 Fausto De Donato Composition for bleaching woodpulp and process for its production
EP1418269A1 (de) * 2002-11-05 2004-05-12 Rohm And Haas Company Verfahren zum Bleichen von mechanischer Pulpe
US7163564B2 (en) 2002-11-05 2007-01-16 Jean Luc Sibiet Method for brightening virgin mechanical pulp

Also Published As

Publication number Publication date
EP0191756B1 (de) 1989-01-04
DE3661641D1 (en) 1989-02-09
BR8600637A (pt) 1986-11-04
FI85729B (fi) 1992-02-14
NO166244C (no) 1991-06-19
NO860546L (no) 1986-08-18
JPS61245392A (ja) 1986-10-31
SE8600615L (sv) 1986-08-16
FI860688A (fi) 1986-08-16
SE8600615D0 (sv) 1986-02-12
NO166244B (no) 1991-03-11
FI860688A0 (fi) 1986-02-14
ATE39714T1 (de) 1989-01-15
FI85729C (fi) 1992-05-25

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