EP0258352B1 - Hochtemperatur-hochkonsistenz-schnellbleiche - Google Patents

Hochtemperatur-hochkonsistenz-schnellbleiche Download PDF

Info

Publication number
EP0258352B1
EP0258352B1 EP87901454A EP87901454A EP0258352B1 EP 0258352 B1 EP0258352 B1 EP 0258352B1 EP 87901454 A EP87901454 A EP 87901454A EP 87901454 A EP87901454 A EP 87901454A EP 0258352 B1 EP0258352 B1 EP 0258352B1
Authority
EP
European Patent Office
Prior art keywords
bleaching
disperser
rapid
consistency
chemicals
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
EP87901454A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0258352A1 (de
Inventor
Wolfgang Matzke
Harald Selder
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss 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=4197028&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0258352(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sulzer Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT87901454T priority Critical patent/ATE53082T1/de
Publication of EP0258352A1 publication Critical patent/EP0258352A1/de
Application granted granted Critical
Publication of EP0258352B1 publication Critical patent/EP0258352B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • the invention relates to the high-temperature, high-consistency rapid bleaching of pulp obtained from waste paper for the production of paper, the bleaching chemicals being added to the fabric immediately before a mixing operation.
  • the subject matter of the invention further relates to an oxidizing peroxide bleach, as well as to a reducing bleach made with dithionite as bleaching agent.
  • a method common today e.g. worked with the dithionite as a bleaching agent in such a way that a thin substance suspension with a 5% (weight) substance content is heated to 60 ° C. and this material is mixed with 1-2% dithionite in a twin-shaft mixer. This mixture is transferred to a bleaching tower in which there is an upward flow and where the bleaching material remains for over 60 minutes.
  • dithionite as a bleaching agent is the so-called MC, i.e. Medium consistency method in which a consistency of 15% (weight) fiber is used. In this case too, 1-2% dithionite is added to the material.
  • the MC pump that mixes the bleach quickly and well. Nevertheless, with this method, an air extraction must be ensured, for which purpose the MC pump is set up so that an air extraction takes place at the same time during the mixing process. Since this is a reducing bleaching process, it is necessary to work without the presence of air, which would otherwise cause the bleaching agent to be decomposed by oxygen. In this case too, the bleached material will have a temperature of about 60 ° C and the bleaching time will be about 60 minutes. Because of the higher concentration, a slightly smaller bleaching tower can be used with this method than was necessary with the previously mentioned thin material method.
  • a bleaching process can also be carried out in refiners.
  • US-A-3,467,574 offers a possibility of bleaching so-called chips from cellulose production with the aid of a refiner treatment.
  • the mixing effect of a refiner is not sufficient for high demands.
  • the French FR-A-1 239 047 shows a device which looks similar to the known disperser, but the bleaching process described there is significantly different, e.g. due to the low temperature of 40 ° to 60 ° C not comparable to a high temperature high consistency quick bleach.
  • the response times should be shortened. It should be worked in a consistency of over 15%.
  • This object is achieved in that the bleaching chemicals are added to the substance immediately after the thickened fiber material has been heated, that the mixing process is carried out in a high-speed, short-term intensive mixer of the type of a disperser in which the mixture is passed through many narrow spaces Slots of the disperger set are forced, whereby the material is simultaneously subjected to strong shear and impact loads, and the mixing process takes place within three seconds.
  • the high consistency of the fabric saves a great deal of thermal effort.
  • the disperger is particularly well suited for this task as an intensive, short-term bleaching mixer, because here the material is positively guided through many narrow slots under simultaneous strong shear and impact loads. This kneading brings the active chemical extremely quickly into the immediate vicinity of the fiber, where the chemical diffusion into the interior of the fiber then begins and takes place quickly.
  • a disperser is used as the mixer because two process tasks are then carried out in one device: by mixing the use of the bleaching chemicals and by simultaneously dispersing the substance, rendering contaminants harmless, which occurs when processing Waste paper is necessary.
  • the high consistency means an increase in the concentration of bleaching chemicals, i.e. according to the law of mass action also an increase in the bleaching product.
  • interfering constituents of the fiber e.g. Heavy metal ions, which cause the bleach to decompose, naturally also have to be expected to concentrate these disruptive components if the consistency of the fabric to be processed is increased.
  • Appropriate measures e.g. through the so-called complexation, i.e. Addition of complexing agents to be counteracted.
  • Another advantage of this method is that it is possible to work at a temperature of, for example, 95 ° C., which is also required for hot dispersion to render the abovementioned impurities harmless, so that no additional heating of the fiber material is required.
  • a temperature of, for example, 95 ° C. which is also required for hot dispersion to render the abovementioned impurities harmless, so that no additional heating of the fiber material is required.
  • the dispersing temperature which should also be the bleaching temperature, must not be so high that this leads to excessive decomposition of the bleaching agent. This is achieved by - as mentioned above - working in a pressure-free area below 100 ° C.
  • the bleaching reaction rate is very high, e.g. 80-90% of the bleaching effect can be achieved in an effective bleaching time of 1 minute or less.
  • the reaction is practically complete after 5 minutes. This leads to the fact that instead of a larger bleaching tower for a dwell time of 60 minutes, a much smaller buffer tank can be used due to the high reaction speed. This must be dimensioned for a maximum of 15 minutes. Because of the rapid bleaching agent mixing in a period of approx. 1 second and because of the short and equal bleaching time, no measures are required to displace the air, as was the case in the past. Such a reducing process can also be carried out in the presence of air. There is no significant decomposition of the bleaching agent, so that the achievable white gain for a given bleaching agent use is only slightly below or equal to that of a complex conventional bleaching method.
  • the mentioned combination of dispersion and bleaching effects can save a separate bleaching stage, since the bleaching effect of the process takes place simultaneously with the dispersion step.
  • the fibrous material 1 which was prepared for the production of paper from waste paper, comes into a tearing screw apparatus 2, in which the screw is driven by a motor 3.
  • the material is transferred to a heating apparatus 4, the screw of which is driven by a motor 5 and which is heated via a steam line 6.
  • the pulp is heated to approx. 95 ° C in this apparatus.
  • the heated pulp falls into an input shaft 7 of a fast-running short-term intensive mixer, in this case it is the disperser 11, that is to say the bleaching agent is already added to the thickened and heated fiber pulp in the input shaft 7 Bleaching chemicals through a line 8, which mün in the input shaft 7 det, admitted.
  • the mixing process then begins directly in the area of a screw conveyor 21, which is accommodated in a housing 10 of the disperser 11 and is driven by a motor 9.
  • This screw 21 conveys the material into the chamber 20 of the disperser, in which it is flung radially outwards, so that it comes into the teeth of the stator 18 or the rotor 17 of the disperser and leaves the disperser after this passage.
  • This mixing-dispersing process takes less than 1 second.
  • the material is positively guided over the screw 21, through the chamber 20, and through the toothing of the rotor 17 and the stator 18, it being between the teeth and when passing through the slots, which can be seen particularly well in FIG. 3 between the teeth , subjected to strong shear, impact and kneading stresses.
  • the disperger set at lightning speed in less than 1 second.
  • the dispersed mixture is transferred from the disperser 11 into a buffer tank 14, in which the bleaching process is ended.
  • the bleached material is carried away as finished material through a line 15 for further processing. No special measures need to be taken to keep air away from the material.
  • the tank 14 is also opened to the atmosphere by a vent 16.
  • a mixture of wood-containing and wood-free waste paper was processed in a test center in a pulper at 15% consistency and 50 ° C with the addition of 0.2% complexing agent DTPA, 0.4% sodium hydroxide NaOH, 2% water glass and 0.5% hydrogen peroxide H 2 0 2 resolved.
  • the fabric was washed on the Variosplit washer (R).
  • the white content R 457 of the starting material was increased from 60.5 to 64.3% MgO.
  • the fabric density of the washed fabric was 8.5%.
  • This fibrous material was diluted to 3.3% consistency, mixed with a further 0.7% sodium hydroxide NaOH and 0.1% complexing agent DTPA and then thickened to 25.7% consistency by means of a screen press. Its white content R 457 was now 65.9% MgO. After passing through a heating screw with a heating time of 5 minutes and a disperser - in each case without the addition of bleaching chemicals - the fabric temperature was 95 ° C, the fabric density 23% and the white content R 457 64.1% MgO.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Steroid Compounds (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Pens And Brushes (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP87901454A 1986-03-04 1987-02-21 Hochtemperatur-hochkonsistenz-schnellbleiche Expired - Lifetime EP0258352B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87901454T ATE53082T1 (de) 1986-03-04 1987-02-21 Hochtemperatur-hochkonsistenz-schnellbleiche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH86786 1986-03-04
CH867/86 1986-03-04

Publications (2)

Publication Number Publication Date
EP0258352A1 EP0258352A1 (de) 1988-03-09
EP0258352B1 true EP0258352B1 (de) 1990-05-23

Family

ID=4197028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87901454A Expired - Lifetime EP0258352B1 (de) 1986-03-04 1987-02-21 Hochtemperatur-hochkonsistenz-schnellbleiche

Country Status (7)

Country Link
US (1) US4909900A (fi)
EP (1) EP0258352B1 (fi)
JP (1) JPS63502677A (fi)
AT (1) ATE53082T1 (fi)
DE (2) DE3610940A1 (fi)
FI (1) FI88627C (fi)
WO (1) WO1987005346A1 (fi)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831668A1 (de) * 1988-09-17 1990-03-22 Escher Wyss Gmbh Verfahren zur weissgraderhoehung von altpapier mit neutralem wasserkreislauf
US5316621A (en) * 1990-10-19 1994-05-31 Kanzaki Paper Mfg. Co., Ltd. Method of pulping waste pressure-sensitive adhesive paper
DE69120253T2 (de) * 1990-11-13 1997-01-30 Block, Myron J., North Salem, N.H. Apparat zur fluoreszenzanalyse
US5520780A (en) * 1993-11-30 1996-05-28 Dxresources Corporation Method and apparatus for de-inking newsprint using counterflow extractor
US6001218A (en) * 1994-06-29 1999-12-14 Kimberly-Clark Worldwide, Inc. Production of soft paper products from old newspaper
US6074527A (en) * 1994-06-29 2000-06-13 Kimberly-Clark Worldwide, Inc. Production of soft paper products from coarse cellulosic fibers
US5582681A (en) * 1994-06-29 1996-12-10 Kimberly-Clark Corporation Production of soft paper products from old newspaper
SE9403494L (sv) * 1994-10-13 1996-04-14 Aga Ab Sätt och anordning vid blekning av returfiber
DE19545852A1 (de) * 1995-12-08 1997-06-12 Voith Sulzer Stoffaufbereitung Verfahren zur Zugabe von reduzierendem Bleichmittel zu einem hochkonsistenten Papierfaserstoff
DE19614947B4 (de) * 1996-04-16 2004-04-08 Voith Paper Fiber Systems Gmbh & Co. Kg Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff
SE506803C2 (sv) * 1996-07-25 1998-02-16 Cellwood Machinery Ab Sätt och anläggning för blekning av returpappersmassa
US6296736B1 (en) 1997-10-30 2001-10-02 Kimberly-Clark Worldwide, Inc. Process for modifying pulp from recycled newspapers
DE19704183A1 (de) * 1997-02-05 1998-08-06 Voith Sulzer Stoffaufbereitung Verfahren und Vorrichtung zur reduzierenden Bleiche von hochkonsistentem Papierfaserstoff
DE19712653C2 (de) 1997-03-26 2002-10-24 Voith Paper Fiber Systems Gmbh Verfahren und Vorrichtung zur Dispergierung eines Altpapierfaserstoffes
US6387210B1 (en) 1998-09-30 2002-05-14 Kimberly-Clark Worldwide, Inc. Method of making sanitary paper product from coarse fibers
DE19845513A1 (de) * 1998-10-02 2000-04-06 Voith Sulzer Papiertech Patent Verfahren zur Abtötung von Keimen in papierfaserhaltigem Material sowie Vorrichtungen zur Durchführung des Verfahrens
DE19923865A1 (de) 1999-05-25 2000-11-30 Voith Sulzer Papiertech Patent Verfahren zur Herstellung von Garnituren für das mechanische Bearbeiten von wasserhaltigem Papierfaserstoff
US6419792B1 (en) 1999-08-20 2002-07-16 Ein Kohsan Co., Ltd. Photocatalytic pulp composition
DE19958038A1 (de) * 1999-12-03 2001-06-07 Voith Paper Patent Gmbh Verfahren zur Erhöhung des Wasserrückhaltevermögens von Papierfaserstoffen
NO20005869L (no) * 2000-06-16 2001-12-17 Ein Kohsah Co Ltd Laminert fotokatalytisk massepapir og fremgangsmåte til fremstilling av samme
DE10102449C1 (de) 2001-01-19 2002-03-21 Voith Paper Patent Gmbh Vorrichtung zur Heiß-Dispergierung eines Papierfaserstoffes
JP2003119679A (ja) * 2001-10-17 2003-04-23 Aikawa Iron Works Co Ltd パルプ加熱装置
AT411604B (de) * 2002-03-27 2004-03-25 Andritz Ag Maschf Verfahren und vorrichtung zur dispergierung eines papierfaserstoffes
DE102009012468A1 (de) * 2009-03-12 2010-09-23 Hwt Wassertechnische Anlagen Gmbh Verfahren zur Bereitstellung von Wasserglas für eine industrielle Anwendung

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL158779C (fi) * 1950-01-30 1900-01-01
US2716926A (en) * 1951-01-02 1955-09-06 Jackson And Church Company Apparatus for treating wood pulp
DE854613C (de) * 1951-04-08 1952-11-06 Degussa Verfahren zum Bleichen von verholztem und unverholztem Zellulosefasermaterial
FR1239047A (fr) * 1959-10-15 1960-08-19 Papeteries Leon Riquet Procédé de blanchiment de la pâte à papier et appareil pour la mise en oeuvre dece procédé
SE303088B (fi) * 1963-05-31 1968-08-12 Defibrator Ab
DE1546282A1 (de) * 1965-10-16 1969-10-02 Agricola Ind Per La Cellulosa Verfahren und Anlage zum Bleichen von Zellulose
US3467574A (en) * 1966-06-14 1969-09-16 Crown Zellerbach Corp Refiner bleaching of high yield pulps
LU76021A1 (fi) * 1976-10-15 1978-05-16
SE422818B (sv) * 1978-03-31 1982-03-29 Modo Chemetrics Ab Forfarande for foredling av allulosamassa genom blekning eller extrahering
FI62872C (fi) * 1978-06-06 1983-03-10 Ahlstroem Oy Anordning foer silning av fibersuspensioner
DE2901942B1 (de) * 1979-01-19 1979-08-16 Voith Gmbh J M Verfahren zum Aufbereiten von Altpapier
SE419603B (sv) * 1979-11-27 1981-08-17 Kamyr Ab Apparat for inblandning av behandlingsmedel i suspensioner
FR2482989A1 (fr) * 1980-05-22 1981-11-27 Interox Procede pour la regeneration de vieux papiers
DE3320526A1 (de) * 1981-12-09 1984-12-13 Steinbeis Papier GmbH, 7121 Gemmrigheim Verfahren zur herstellung von papieren, papier und dessen verwendung
DE3200893C1 (de) * 1982-01-14 1983-06-01 J.M. Voith Gmbh, 7920 Heidenheim Verfahren und Anlage zur Herstellung von gereinigtem Faserstoff aus Altpapier
ZA837927B (en) * 1983-05-23 1985-01-30 Process Evaluation Devel Thermomechanical digestion process using bleachants

Also Published As

Publication number Publication date
ATE53082T1 (de) 1990-06-15
DE3762894D1 (de) 1990-06-28
FI874724A (fi) 1987-10-27
FI874724A0 (fi) 1987-10-27
JPS63502677A (ja) 1988-10-06
FI88627B (fi) 1993-02-26
EP0258352A1 (de) 1988-03-09
FI88627C (fi) 1993-06-10
US4909900A (en) 1990-03-20
WO1987005346A1 (fr) 1987-09-11
DE3610940A1 (de) 1987-09-10

Similar Documents

Publication Publication Date Title
EP0258352B1 (de) Hochtemperatur-hochkonsistenz-schnellbleiche
DE69028797T2 (de) Verfahren zum Bleichen von Zellstoff mit Ozon
DE2027319C3 (de) Verfahren zur Herstellung von chemisch gut loslichem Zellstoff
DE60316712T2 (de) Verfahren zur herstellung von holzstoff und der so hergestellte holzstoff
DE2815922C3 (de) Verfahren zur Peroxidbleichung von Hochausbeutezellstoff in einem Turm
EP0325890B1 (de) Verfahren zur Behandlung von Lignin enthaltender Cellulosemasse mit Ozon
DE2945421C2 (fi)
DE68924793T2 (de) Verfahren zum Bleichen von mechanischem Holzstoff.
EP0441113A1 (de) Verfahren zum chlorfreien Bleichen von Zellstoff
EP0802275A1 (de) Verfahren zur Erhöhung des Weissgrades von Papierfaserstoff
EP0434662A1 (de) Verfahren zum Bleichen von cellulosehältigen Materialien sowie Anlage zur Durchführung des Verfahrens
DE3034042C2 (de) Verfahren zur Reduzierung des Harzgehalts bei der Herstellung von Zellulosepulpe aus Lignozellulose-Material
DE4400954B4 (de) Verfahren zur Helligkeitssteigerung bei der Bleiche von Holzstoffen mit Wasserstoffperoxid
DE3110882C2 (de) Verfahren und Vorrichtung zum Bleichen von chemisch hergestelltem Zellstoff mit Ozon
DE60124081T2 (de) Verfahren zum bleichen von holzstoff und chemothermomechanischer pulpe
DE1203592B (de) Verfahren zum Bleichen von cellulosehaltigen Faserstoffen
DE3118384C1 (de) Verfahren zum Bleichen von chemisch hergestelltem Zellstoff mit Ozon
EP0867561A1 (de) Verfahren und Vorrichtungen zur Herstellung eines heissen, überwiegend Papierfasern enthaltenden Krümelstoffes
CH655965A5 (de) Verfahren fuer die reduktion des harzgehaltes waehrend der herstellung von zellulose-papierbreien aus lignozellulose-materialien.
DE3902423A1 (de) Verfahren zur bleiche von faserstoffen zur papierherstellung
DE19626200C2 (de) Verfahren zur Erhöhung des Weißgrades von Altpapierfaserstoff
DE3809332A1 (de) Mehrstufiges verfahren zur bleiche von holzstoffen
AT408986B (de) Verfahren zur alkalisierung von zellstoff
DE2441440C3 (de) Verfahren zum Aufschließen von Holz
DE19827188C1 (de) Verfahren zur Aufbereitung von holzstoffhaltigem Altpapier

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19871016

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE SE

17Q First examination report despatched

Effective date: 19890522

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE SE

REF Corresponds to:

Ref document number: 53082

Country of ref document: AT

Date of ref document: 19900615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3762894

Country of ref document: DE

Date of ref document: 19900628

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19910221

26 Opposition filed

Opponent name: J.M. VOITH GMBH

Effective date: 19910123

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920303

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19931227

Year of fee payment: 8

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19931029

EUG Se: european patent has lapsed

Ref document number: 87901454.6

Effective date: 19940316