EP1180172B1 - Verfahren zum zellstoffbleichen mit reduzierten organischen halogenverbindungen - Google Patents

Verfahren zum zellstoffbleichen mit reduzierten organischen halogenverbindungen Download PDF

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Publication number
EP1180172B1
EP1180172B1 EP00926590.1A EP00926590A EP1180172B1 EP 1180172 B1 EP1180172 B1 EP 1180172B1 EP 00926590 A EP00926590 A EP 00926590A EP 1180172 B1 EP1180172 B1 EP 1180172B1
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EP
European Patent Office
Prior art keywords
halogen compounds
organic halogen
bleaching
pulp
chemical pulps
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 - Lifetime
Application number
EP00926590.1A
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English (en)
French (fr)
Other versions
EP1180172A1 (de
Inventor
Silvia Maria Pasquali
Guilherme Antonio Tedeschi De Araujo
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.)
Fibria Celulose SA
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Fibria Celulose SA
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Filing date
Publication date
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Publication of EP1180172A1 publication Critical patent/EP1180172A1/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • 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
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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

  • the present invention refers to an enhanced process for bleaching pulps that allows the obtention of a low concentration of organic halogen compounds in the final cellulose pulp.
  • Patent US 4,959,124 refers to a process for reducing organic halogen compounds in low consistency pulp by treating the pulp with chlorine dioxide in a first bleaching step necessarily followed by a stage of ozone treatment.
  • the objective of the present invention is, therefore, to provide a pulp bleaching process that allows an efficient reduction in the OX content specially in low consistency pulps, and that can also reduce the amount of chemicals necessary to achieve the final OX reduction.
  • the present invention refers to a process for bleaching chemical pulps, especially low consistency chemical pulps, characterised by comprising the sequential steps DO-Eop-Q-(PO-P) wherein the addition of chlorine dioxide is carried out only in the first bleaching stage as a charge of 6 kg/tsa to 8 kg/tsa (i.e. 6 kg/adt to 8 kg/adt) and at a pH in the range of about 4.5 to 5.5.
  • CIO 2 in the first bleaching stage together with the control of the pH in the range of 4.5 to 5.5 allows the use of ClO 2 charges up to 10 kg/tsa (i.e. up to kg / air dried ton) without any disadvantageous production of organic halogen compounds.
  • the ClO 2 is added to the pulp in a range of 6 kg/tsa to 8 kg/tsa, (i.e 6 kg / air dried ton to 8 kg / air dried ton), more preferably at about 8 kg/tsa (i.e 8 kg / air dried ton).
  • organic halogen compounds concentrations in the final product (pulp) lower than about 30 ppm.
  • Such a low OX formation is primarily due to the enhanced control of the pH during the deoxidation step followed by the conventional subsequent extraction steps based on the use of sodium hydroxide and hydrogen peroxide.
  • a bleaching stage comprising (the sequential steps DO-Eop-Q-(PO-P), that is, treatment steps with (chlorine dioxide - hydrogen peroxide alkali - sequestering agents (chelating agents) - peroxide ozone peroxide), expressive gains in brightness and in the reduction of chemicals necessary to the removal of organic halogen compounds are obtained by working at low consistency conditions and with addition of chlorine dioxide in the first bleaching stage, and further controlling the pH in the ideal range of 4.5 to 5.5.
  • the graphic shown in Figure 3 indicates a more efficient control of the average OX content in the resulting product in accordance with the present invention, with said OX values being stable at levels of about 15 ppm.
  • Figure 1 illustrates the decrease of H 2 O 2 added to the pulp in a process according to the invention, wherein the gain in the reduction of the H 2 O 2 employed may be of up 40% while maintaining the low content of OX and low brightness reversion. H 2 O 2 reductions to values lower than 35 kg/tsa (i.e., 35 kg/ adt) were achieved.
  • Figure 2 shows the relationship between the peroxide added and the initial Kappa number which is also a good indicative of the reduction of the H 2 O 2 needed and, consequently, of the enhanced results in the final product.
  • the addition of ClO 2 in the first stage of the bleaching process carried out under the above mentioned conditions helps the removal of the organic charge, also contributing for the removal of lignin, as well as the increase of the H 2 O 2 reactivity in the Eop stage, whereby providing enhanced brightness when compared to pulps treated with the same amount of peroxide within conventional processes.
  • the pulps obtained by the process according to the present invention show brightness of about 90% ISO and all technical process parameters lead to low production costs and to a high recycling rates of effluents in the bleaching process.
  • Figure 5 presents the relationship of the added chlorine dioxide amount to the OX content formed in the pulp during the process of the invention. It can be seen that the ratio of ClO 2 to the OX content did not vary even when increasing the ClO 2 amount, which indicates that the latter acted for removing the OX present in the pulp after the first stage, thus maintaining the pulp quality in the desirable levels.
  • Figure 4 shows the potential brightness gain with the addition of ClO 2 in a stage prior to the step of adding hydrogen peroxide
  • the performance of the Eop stage was substantially enhanced with the addition of 2 Kg/tsa (2 mg/adt) of ClO 2 , in the DO.

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

Claims (2)

  1. Verfahren zum Zellstoffbleichen, dadurch gekennzeichnet, das es die sequenziellen Schritte DO-Eop-Q-(PO-P) umfasst, wobei die Zugabe von Chlordioxid nur in der ersten Bleichstufe ausgeführt wird, mit einer Füllmenge von 6 kg/tsa bis 8 kg/tsa (6 kg/adt bis 8 kg/adt) und bei einem pH Wert im Bereich von 4,5 bis 5,5.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Chlordioxid mit einer Füllmenge von 8 kg/tsa (8 kg/adt) zugegeben wird.
EP00926590.1A 1999-04-27 2000-04-27 Verfahren zum zellstoffbleichen mit reduzierten organischen halogenverbindungen Expired - Lifetime EP1180172B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BR9901291A BR9901291B1 (pt) 1999-04-27 1999-04-27 processo para branqueamento de polpas quìmicas de baixa consistência.
BR9901291 1999-04-27
PCT/BR2000/000038 WO2000065148A1 (en) 1999-04-27 2000-04-27 Process for bleaching chemical pulps with low organic halogen compounds content

Publications (2)

Publication Number Publication Date
EP1180172A1 EP1180172A1 (de) 2002-02-20
EP1180172B1 true EP1180172B1 (de) 2014-07-02

Family

ID=4072226

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00926590.1A Expired - Lifetime EP1180172B1 (de) 1999-04-27 2000-04-27 Verfahren zum zellstoffbleichen mit reduzierten organischen halogenverbindungen

Country Status (9)

Country Link
EP (1) EP1180172B1 (de)
BR (1) BR9901291B1 (de)
CA (1) CA2372069C (de)
ES (1) ES2501141T3 (de)
IS (1) IS6132A (de)
NO (1) NO331632B1 (de)
PT (1) PT1180172E (de)
WO (1) WO2000065148A1 (de)
ZA (1) ZA200108811B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099186A1 (en) * 2001-06-06 2002-12-12 Kvaerner Pulping Ab Reduction of organically bound chlorine formed in chlorine dioxide bleaching

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3720577A (en) * 1970-05-25 1973-03-13 Int Paper Co Chlorine dioxide-peracetic acid-chlorine dioxide pulp bleaching sequence
SU1141128A1 (ru) * 1983-12-08 1985-02-23 Центральный научно-исследовательский институт бумаги Способ отбелки целлюлозы
US4959124A (en) 1989-05-05 1990-09-25 International Paper Company Method of bleaching kraft pulp in a DZED sequence
EP0496782B1 (de) * 1989-10-19 1996-03-20 North Carolina State University Hochleistendes verfahren zum bleichen von zellstoff mit chlordioxyd
US5030324A (en) 1990-01-29 1991-07-09 Champion International Corporation Sequential bleaching procedure using chlorine and chlorine dioxide in a first chlorination stage of a multistage bleaching process
SE9000340L (sv) 1990-01-31 1991-08-01 Eka Nobel Ab Foerfarande vid blekning av lignocellulosahaltigt material

Also Published As

Publication number Publication date
NO20015241L (no) 2001-11-27
IS6132A (is) 2001-10-26
NO20015241D0 (no) 2001-10-26
BR9901291A (pt) 2000-11-07
CA2372069A1 (en) 2000-11-02
BR9901291B1 (pt) 2011-11-01
ES2501141T3 (es) 2014-10-01
WO2000065148A1 (en) 2000-11-02
NO331632B1 (no) 2012-02-13
EP1180172A1 (de) 2002-02-20
PT1180172E (pt) 2014-09-25
CA2372069C (en) 2011-06-21
ZA200108811B (en) 2002-10-25

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