EP0258352A1 - Hochtemperatur-hochkonsistenz-schnellbleiche. - Google Patents
Hochtemperatur-hochkonsistenz-schnellbleiche.Info
- Publication number
- EP0258352A1 EP0258352A1 EP87901454A EP87901454A EP0258352A1 EP 0258352 A1 EP0258352 A1 EP 0258352A1 EP 87901454 A EP87901454 A EP 87901454A EP 87901454 A EP87901454 A EP 87901454A EP 0258352 A1 EP0258352 A1 EP 0258352A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bleaching
- disperser
- rapid
- carried out
- 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.)
- Granted
Links
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 high-temperature, high-consistency rapid bleaching of fibrous material for the production of paper.
- the invention also relates to the rapid bleaching of fibrous material which has been prepared from waste paper.
- 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.
- the dithionite is used as the bleaching agent, for example, in such a way that a thin material suspension with a 5% (weight) proportion of substance is heated to 60 ° C. and this material in a double-shaft mixer with 1-2% dithionite be mixed. 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.
- Another method known with dithionite as the bleaching agent is the so-called MC, ie 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 mixer is a mixer pump, the so-called MC pump, which mixes the bleach quickly and well.
- This object is achieved according to the invention in that the lead chemicals are added to the substance immediately after the thickened fibrous material has been heated up and immediately before a mixing process, which mixing process takes place in a short-term, intensive intensive snowmaker and in a time of less than 3 seconds is carried out. It was found to be particularly advantageous to carry out the mixing process in a disperser in which the mixture is forced through many narrow slots in the disperser set, where the material is simultaneously subjected to strong shear and impact stresses and the mixing process takes place within a second .
- the high consistency of the fabric saves a great deal of thermal effort.
- the disperger is particularly outstanding for this task as an intensive short-term bleaching mixer, because here the material is positively guided through mixing through many narrow slots under simultaneous strong shear and impact stress. 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 occurs quickly.
- the high consistency means an increase in the concentration of bleaching chemicals, ie after Mass effect law also an increase in the bleaching product.
- interfering constituents of the fibrous material for example heavy metal ions which cause decomposition of the bleaching agent, one must naturally also expect a concentration of these interfering constituents if the consistency of the substance to be processed is increased. This must be countered by suitable measures, for example by so-called complexing, ie adding complexing agents.
- 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 impurities mentioned 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 impurities mentioned harmless, so that no additional heating of the fiber material is required.
- the dispersing temperature which should also be the bleaching temperature at the same time, 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 proposed method takes full advantage of a dithionite bleach.
- the following characteristics characterize the dithionite bleach:
- Your low activation energy i.e. the course of the reaction is largely determined by the diffusion of the bleaching agent into the fiber and less, or not at all, by catalytic, dissociative and concentrative processes.
- the bleaching reaction rate is very high, for example 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 container can be used because of the high reaction speed. This must be dimensioned for a maximum of 15 minutes dwell time. Because of the rapid bleaching agent blending in a period of about 1 second and because of the short and equal bleaching time, no measures are necessary 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 - p
- FIG. 1 shows schematically a plant for carrying out the rapid bleaching according to the invention
- FIG. 2 shows a partial longitudinal section through a disperser
- Figure 3 shows a photographic Elick in an open disperser.
- 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 substance is transferred to a heating device 4.
- the heated fibrous material falls into an input shaft 7 of a high-speed, short-term intensive mixer, in this case it is the disperser 11, ie the bleaching agent is already in the input shaft 7 for the thickened and heated fibrous material , the bleaching chemicals through a line 8, which opens into the input shaft 7, added.
- 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 outward, 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 place in a time shorter than 1 second.
- the material is positively guided over the screw 21, through the chamber 20, and through the teeth 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.
- This passage through the Disperger set described does not only involve bleaching f »
- the known arrangement of the stator 18 and the rotor 17 and their toothing can be seen particularly well from FIGS. 2 and 3.
- the rotor 17 is carried and driven by a shaft 19 which is mounted in a housing 12 of the disperser. This shaft 19 is driven by a motor 13.
- the speed of the rotor is relatively high. Depending on the diameter of the rotor, the speed is between 1000 - 3600 revolutions per minute.
- 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 product 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 made in the pilot plant in a solvent 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% water ⁇ Dissolved peroxide H Directory0_. After cleaning and sorting of the thick substance, the substance was washed on the Variosplit washer (R). The whiteness R 4 7 of the starting material was increased from 60.5 to 64.3% MgO. The fabric density of the washed fabric was 8.5%.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Paper (AREA)
- Steroid Compounds (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Non-Reversible Transmitting Devices (AREA)
- Pens And Brushes (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
Claims
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 true EP0258352A1 (de) | 1988-03-09 |
EP0258352B1 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 (de) |
EP (1) | EP0258352B1 (de) |
JP (1) | JPS63502677A (de) |
AT (1) | ATE53082T1 (de) |
DE (2) | DE3610940A1 (de) |
FI (1) | FI88627C (de) |
WO (1) | WO1987005346A1 (de) |
Families Citing this family (24)
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 | Apparat zur fluoreszenzanalyse |
US5520780A (en) * | 1993-11-30 | 1996-05-28 | Dxresources Corporation | Method and apparatus for de-inking newsprint using counterflow extractor |
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 |
US6001218A (en) * | 1994-06-29 | 1999-12-14 | Kimberly-Clark Worldwide, Inc. | 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE500901A (de) * | 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 (de) * | 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 (de) * | 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 |
-
1986
- 1986-04-02 DE DE19863610940 patent/DE3610940A1/de not_active Withdrawn
-
1987
- 1987-02-21 DE DE8787901454T patent/DE3762894D1/de not_active Revoked
- 1987-02-21 WO PCT/EP1987/000097 patent/WO1987005346A1/de not_active Application Discontinuation
- 1987-02-21 AT AT87901454T patent/ATE53082T1/de active
- 1987-02-21 EP EP87901454A patent/EP0258352B1/de not_active Expired - Lifetime
- 1987-02-21 JP JP62501871A patent/JPS63502677A/ja active Pending
- 1987-10-27 FI FI874724A patent/FI88627C/fi not_active IP Right Cessation
-
1989
- 1989-06-23 US US07/370,878 patent/US4909900A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO8705346A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3610940A1 (de) | 1987-09-10 |
JPS63502677A (ja) | 1988-10-06 |
WO1987005346A1 (fr) | 1987-09-11 |
EP0258352B1 (de) | 1990-05-23 |
FI88627C (fi) | 1993-06-10 |
FI874724A0 (fi) | 1987-10-27 |
FI88627B (fi) | 1993-02-26 |
ATE53082T1 (de) | 1990-06-15 |
US4909900A (en) | 1990-03-20 |
DE3762894D1 (de) | 1990-06-28 |
FI874724A (fi) | 1987-10-27 |
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Legal Events
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