EP2348154A1 - Procédé de fabrication de matériaux en bois - Google Patents

Procédé de fabrication de matériaux en bois Download PDF

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Publication number
EP2348154A1
EP2348154A1 EP10000618A EP10000618A EP2348154A1 EP 2348154 A1 EP2348154 A1 EP 2348154A1 EP 10000618 A EP10000618 A EP 10000618A EP 10000618 A EP10000618 A EP 10000618A EP 2348154 A1 EP2348154 A1 EP 2348154A1
Authority
EP
European Patent Office
Prior art keywords
bleaching
acid
acidic
phase
grinding
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.)
Withdrawn
Application number
EP10000618A
Other languages
German (de)
English (en)
Inventor
Peter Dipl.Ing. Bräuer
Johann Dipl.Ing. Grossalber
Dieter Dipl.Ing. Teubner
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.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Priority to EP10000618A priority Critical patent/EP2348154A1/fr
Priority to PCT/EP2011/000150 priority patent/WO2011088973A1/fr
Publication of EP2348154A1 publication Critical patent/EP2348154A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds
    • 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 invention relates to a process for the production of wood pulp with a wood chips washing, an impregnation, a grinding and a bleaching, in particular peroxide bleaching.
  • Wood pulps with different quality characteristics are used today in paper and board production in many ways.
  • the wood pulp is bleached by various methods, depending on the type of wood used, the manufacturing process and the whiteness requirements.
  • High whiteness almost exclusively bleaching with hydrogen peroxide (H202) or a combined bleaching with hydrogen peroxide and sodium dithionite (Na2S2O5) is used.
  • prior art bleaching is carried out after milling ("afterglow”).
  • the bleach can be carried out in 1-stage or 2-stage as peroxide bleach or as combination bleach (P-Y).
  • Milling is carried out according to the TMP process without additional use of chemicals, or in the CTMP process with the use of chemicals (eg sodium sulfite, Na2S03, or sodium bisulfite, NaHSO3) in a pretreatment stage (impregnation).
  • the grinding itself can be carried out in one or more stages with high consistency and / or low consistency refiners. In newer methods, a dosage of peroxide before or in the refiner or after the refiner is provided.
  • the aim of the invention is therefore to prevent this known as “catalytic decomposition" disintegration of the bleaching agent, in particular peroxide and to set an optimal profile of heavy metals in the process.
  • the aim of this acid wash is the removal of heavy metals before the first bleaching stage and before the first refining. This results in an increase in the efficiency of bleaching (higher whiteness and reduced bleach consumption, especially peroxide consumption).
  • the water cycles of the wood chips washing and the impregnation stage (s) are largely separated from the water cycle of the bleaching stages (after grinding). In addition, the amounts of water in the impregnation are low, making it easier to make the water cycle optimal.
  • the wood chips are after the woodchip washing in a so-called impregnation performed and mixed with chemicals for the pretreatment, in which case the Hackschnüzel stiische can also be omitted or designed as part of the impregnation.
  • the primary chemicals used are sodium sulfite (Na2SO3) and caustic soda (NaOH) or mixtures of both. It may be necessary to add other auxiliary chemicals.
  • the impregnated wood chips are fed to the first grinding stage. The defibration takes place in one or more grinding stages, according to the requirements of the quality of the pulp.
  • a possible bleaching of the pulp is generally carried out on the finished material, but in any case after the first milling stage or after one of the milling stages.
  • the bleaching may be carried out as a single-stage or multi-stage bleaching, depending on the required whiteness.
  • One or more washing steps are provided before and between the bleaching stages to wash out existing organic and inorganic contaminants which interfere with bleaching and result in increased chemical consumption and / or inferior whiteness.
  • the bleaching process used is usually peroxide bleaching.
  • the primary goal of peroxide bleaching is to achieve the required whiteness with the lowest possible peroxide consumption. It is a property of peroxide bleaching that the added peroxide (H2O2) is decomposed in the presence of impurities such as heavy metals, resulting in reduced bleaching effect and increased consumption of the bleaching agent (peroxide).
  • H2O2 added peroxide
  • heavy metals are particularly manganese, iron and copper mentioned, which contribute to the decomposition of peroxide, in order to prevent this known as "catalytic decomposition" decay of the peroxide, it is necessary to set an optimal profile of heavy metals in the process. For this purpose, various measures are taken.
  • the chips are fed after washing the impregnation.
  • the woodchip laundry be carried out as part of the impregnation.
  • the wood chips are first compacted and pressed in a so-called wood chip press (Impressafiner), whereby water and impurities are removed.
  • pressing chemicals are supplied.
  • chemicals here mainly caustic soda (NaOH), Peroxide (H2O2) and auxiliary chemicals for the stabilization of the peroxide used (eg silicate, DTPA or similar).
  • NaOH can also be replaced by other alkali or alkaline earth, for.
  • Mg (OH) 2 or Na2C03 and the like are examples of the peroxide used.
  • the impregnated chips are fed to a reaction vessel and guided to the first refining stage after a reaction time.
  • the defibration of the wood chips takes place.
  • additional bleaching chemicals are blended and the fibers bleached to the required whiteness in a bleaching tower. Further grinding of the fibers takes place in further high-consistency or low-consistency refines.
  • the impregnation may also be carried out in two stages in order to improve the efficiency of the pretreatment and the bleaching and / or to reduce the energy consumption in the refiner and / or to improve the fiber quality. This is particularly important for some types of wood and for certain applications.
  • the impregnated chips are not supplied to the first reaction vessel to the refiner but another wood chip press. After pressing again chemicals are metered (as in the 1st impregnation) and fed the impregnated chips to a second reaction vessel. After the given reaction time, the chips are ground in the first milling stage and then bleached in a bleaching tower as described above.
  • the chips are washed in a woodchip washing and then fed to a 1-stage or 2-stage impregnation.
  • the method is applicable to softwood and hardwoods.
  • Fig. 3 shows a method according to the invention.
  • the chips are pressed after the woodchip washing (HS laundry) in a woodchip press 1 as the first dewatering stage. Subsequently, immediately after dehydration, an acid such as sulfuric acid (H2SO4) is added to adjust to a pH of about 2-5.
  • an acid such as sulfuric acid (H2SO4) is added to adjust to a pH of about 2-5.
  • H2SO4 sulfuric acid
  • other known acids can be used, such as.
  • carbonic acid (Na2CO3, CO2) or sodium bisulfite or others are then stored in a reaction vessel at a temperature of 40-100 ° C for a residence time of 10-60 minutes to allow leaching of the heavy metals.
  • the impregnated wood chips are fed to the 2nd impregnation stage.
  • the wood chips are dewatered and thus the dissolved heavy metals are removed.
  • the bleach / bleach chemicals peroxide, alkali (eg, NaOH, Na2CO3, Mg (OH) 2, and others) are added and the mixture is fed to the 2nd reaction vessel (Waterglass) and complexing agent (DTPA) are added to stabilize the bleach and prevent disintegration, and then the wood pulp grinds and the squeezed filtrate can be removed from the process and sent to the wastewater treatment / wastewater treatment plant. It is also possible to lead the entire filtrate or a part thereof for woodchip washing and only from there to send wastewater treatment plant.
  • Fig. 4 shows a method as in Fig. 3 represented and described, but with the simultaneous addition of a complexing agent, such as. B. DTPA or EDTA or similar, for the first impregnation, together with the acid after the woodchip press 1.
  • a complexing agent such as. B. DTPA or EDTA or similar
  • Fig. 5 shows a method in which the addition of the acid in the woodchip washing (HS washing) takes place.
  • the chips are stored at a pH of 2-5 in an intermediate container at a temperature of 40-100 ° C and a residence time of 10 - 60 minutes.
  • the chips are fed to the 1st impregnation stage.
  • the 1st dewatering press woodchip press 1
  • the heavy metals are pressed together with the filtrate and fed to the wastewater treatment. It is also possible to use all or part of the filtrate for woodchip washing and only from there to send wastewater treatment.
  • the bleaching chemicals as in Fig. 3 dosed described and fed the impregnated chips to a reaction vessel.
  • Figure 5 shows a 2-stage impregnation, wherein after the woodchip press 1 complexing agent and after the woodchip press 2 bleaching chemicals are added before the thus treated wood pulp is fed to the grinding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP10000618A 2010-01-22 2010-01-22 Procédé de fabrication de matériaux en bois Withdrawn EP2348154A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10000618A EP2348154A1 (fr) 2010-01-22 2010-01-22 Procédé de fabrication de matériaux en bois
PCT/EP2011/000150 WO2011088973A1 (fr) 2010-01-22 2011-01-14 Procédé pour fabriquer de la pâte mécanique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10000618A EP2348154A1 (fr) 2010-01-22 2010-01-22 Procédé de fabrication de matériaux en bois

Publications (1)

Publication Number Publication Date
EP2348154A1 true EP2348154A1 (fr) 2011-07-27

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ID=42307931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10000618A Withdrawn EP2348154A1 (fr) 2010-01-22 2010-01-22 Procédé de fabrication de matériaux en bois

Country Status (2)

Country Link
EP (1) EP2348154A1 (fr)
WO (1) WO2011088973A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103797175A (zh) * 2011-09-02 2014-05-14 松下电器产业株式会社 滚筒式洗衣机
CN106400561A (zh) * 2016-11-11 2017-02-15 无限极（中国）有限公司 一种利用废弃中药渣造纸制浆的方法
WO2017215877A1 (fr) * 2016-06-17 2017-12-21 Andritz Ag Procédé de production d'une matière fibreuse

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849053A (en) * 1985-09-20 1989-07-18 Scott Paper Company Method for producing pulp using pre-treatment with stabilizers and defibration
EP0494519A1 (fr) * 1991-01-07 1992-07-15 Scott Paper Company Procédé de lessivage à haut rendement
WO1992020855A1 (fr) * 1991-05-24 1992-11-26 Sunds Defibrator Industries Aktiebolag Procede de fabrication de pulpe mecanicothermochimique
WO2003046276A1 (fr) * 2001-11-30 2003-06-05 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Retrait d'elements anorganiques de copeaux de bois
WO2004050983A1 (fr) * 2002-12-04 2004-06-17 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Procede et systeme de traitement de copeaux de bois
US20040118529A1 (en) * 2002-12-24 2004-06-24 Yasuyuki Kamijo Processes for preparing mechanical pulps having high brightness
WO2006053948A1 (fr) * 2004-11-19 2006-05-26 Metso Paper, Inc. Procede et dispositif destines au traitement de copeaux de bois

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4849053A (en) * 1985-09-20 1989-07-18 Scott Paper Company Method for producing pulp using pre-treatment with stabilizers and defibration
EP0494519A1 (fr) * 1991-01-07 1992-07-15 Scott Paper Company Procédé de lessivage à haut rendement
WO1992020855A1 (fr) * 1991-05-24 1992-11-26 Sunds Defibrator Industries Aktiebolag Procede de fabrication de pulpe mecanicothermochimique
WO2003046276A1 (fr) * 2001-11-30 2003-06-05 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Retrait d'elements anorganiques de copeaux de bois
WO2004050983A1 (fr) * 2002-12-04 2004-06-17 Stfi, Skogsindustrins Tekniska Forskningsinstitut Ab Procede et systeme de traitement de copeaux de bois
US20040118529A1 (en) * 2002-12-24 2004-06-24 Yasuyuki Kamijo Processes for preparing mechanical pulps having high brightness
WO2006053948A1 (fr) * 2004-11-19 2006-05-26 Metso Paper, Inc. Procede et dispositif destines au traitement de copeaux de bois

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103797175A (zh) * 2011-09-02 2014-05-14 松下电器产业株式会社 滚筒式洗衣机
CN103797175B (zh) * 2011-09-02 2016-06-01 松下电器产业株式会社 滚筒式洗衣机
WO2017215877A1 (fr) * 2016-06-17 2017-12-21 Andritz Ag Procédé de production d'une matière fibreuse
US11535983B2 (en) 2016-06-17 2022-12-27 Andritz Ag Method for producing a fibrous material
CN106400561A (zh) * 2016-11-11 2017-02-15 无限极（中国）有限公司 一种利用废弃中药渣造纸制浆的方法

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Publication number Publication date
WO2011088973A1 (fr) 2011-07-28

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