EP0778370A1 - Procédé pour l'addition d'un agent de blanchiment réducteur à une pâte à papier - Google Patents

Procédé pour l'addition d'un agent de blanchiment réducteur à une pâte à papier Download PDF

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Publication number
EP0778370A1
EP0778370A1 EP96116115A EP96116115A EP0778370A1 EP 0778370 A1 EP0778370 A1 EP 0778370A1 EP 96116115 A EP96116115 A EP 96116115A EP 96116115 A EP96116115 A EP 96116115A EP 0778370 A1 EP0778370 A1 EP 0778370A1
Authority
EP
European Patent Office
Prior art keywords
pulp
paper pulp
bleaching agent
compression
zone
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
Application number
EP96116115A
Other languages
German (de)
English (en)
Other versions
EP0778370B1 (fr
Inventor
Karl Bunz
Wolfgang Mannes
Josef Schneid
Hans-Otto Henrich
Walter Musselmann
Hans Schnell
Herbert Holik
Volker Niggl
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.)
Voith Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Voith Sulzer Stoffaufbereitung 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
Application filed by Voith Sulzer Stoffaufbereitung GmbH filed Critical Voith Sulzer Stoffaufbereitung GmbH
Publication of EP0778370A1 publication Critical patent/EP0778370A1/fr
Application granted granted Critical
Publication of EP0778370B1 publication Critical patent/EP0778370B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/62—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis comprising liquid feeding, e.g. spraying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • 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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/912—Radial flow
    • B01F2025/9121—Radial flow from the center to the circumference, i.e. centrifugal flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/57—Mixing high-viscosity liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B01F27/2711—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator provided with intermeshing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms

Definitions

  • the invention relates to a method for adding reducing bleach to a high-consistency paper pulp according to the preamble of claim 1.
  • bleaching processes are carried out in the treatment of paper fibers, particularly if they originate from the waste paper.
  • the aim is usually to increase the degree of whiteness.
  • chemicals are required, the effectiveness of which depends on certain physical parameters, e.g. Temperature, but also by the degree to which these bleaching chemicals are mixed with the paper pulp.
  • the economy of the process can also be increased by the fact that the fibrous material has a higher consistency, values between 15 and 25% solids content being particularly advantageous.
  • Intensive bleaching mixers are used to enable the chemicals to be mixed in with substances of the specified consistency. It has been shown that the dispersing machines, which are known per se, not only serve this purpose as a bleaching mixer, but can also increase the cleanliness of the fibrous material due to their high shear forces.
  • the bleaching agents have so far been introduced into the addition device for such dispersing machines in a process of the type specified.
  • the fibrous material is already pre-compressed there, but still contains a more or less large amount of air. If reducing bleaching chemicals are used, the air contained at this point can cause undesirable reactions between the atmospheric oxygen and the bleaching agent. This is particularly undesirable because it consumes bleach and then during the actual bleaching application are no longer available in the required form and quantity.
  • the invention has for its object to be able to use the reducing bleaching agents used more effectively and as completely as possible for bleaching the paper pulp and thereby to improve the bleaching process.
  • the bleaching chemicals are namely supplied at a point in which the substance is already compressed on the one hand, possibly also somewhat better digested, but on the other hand is sufficiently mixed with the bleaching agent during further processing within the dispersing machine.
  • the chemical bleaching then runs optimally.
  • a toothed-disk disperger having a rotor 5 and a stator 6 being indicated as an example of the dispersing machine 3. possibly also contain contaminants. In this highly consistent form (approx. 15-25% dry content) it is often referred to as a crumbly substance. It passes through a chute into the feed device 1 with a transport and stuffing screw 2. In the interior of this The incoming paper pulp is already pre-compressed in the feed device, which is indicated schematically by a dot area. The paper pulp S2 pre-compressed in this way then passes into the processing area 3 of the dispersing machine, in which it is compressed further to the paper pulp S3, indicated by a darker dot area.
  • a bleaching agent B is added to it by a bleaching agent addition device 4, 4 '.
  • the highly compressed paper pulp S3 is therefore both mechanically processed intensively and mixed with the bleach. It then emerges as fiber S4 from the housing of the dispersing machine.
  • the method according to the invention can also be carried out on a kneading machine through which the fibrous material flows axially, as shown for example in FIG. 2.
  • a kneading machine through which the fibrous material flows axially, as shown for example in FIG. 2.
  • Such a machine which is known per se, can also be used for dispersing fibrous material, the kneading work being carried out by means of machining pins 7 which are fastened on a shaft 9 in cooperation with further pins 8 which are fastened to the inside of the housing 10.
  • the pins and possibly other parts of the machine are shaped so that the material is compressed by increasingly narrow or fewer cross-sections.
  • the paper pulp S1 is fed on the left with the aid of a screw, passes the processing area 3 'and leaves the dispersing machine on the right (S4).
  • the method according to the invention can be used, for example by through the wall of the housing 10, the bleach is supplied at the points where the fabric is already sufficiently compressed, i.e. contains as little free air as possible.
  • Fig. 3 shows somewhat more detailed, but still schematically, the structure of a toothed-disk disperger at the point at which the bleach addition device 4, 4 'is mounted.
  • the housing of the dispersing machine is not shown.
  • the stator 6 and the rotor 7, which are each provided with teeth 11 and 12, respectively.
  • radially adjacent teeth move relative to one another while maintaining a distance that is usually only a few millimeters.
  • the fiber material is intensively processed and compressed with shear forces.
  • a hole 13 is expediently made on the stator side, which allows the bleaching chemicals to be fed into the material area of the dispersing machine via a connection 14.
  • Fig. 4 essentially shows the device shown in Fig. 3 in another view, so that the annular arrangement of the teeth 11 and 12 is visible. The cut is made so that the teeth of both parts of the machine, i.e. the stator and the rotor, are cut. It can also be seen in the supervision that the bores 13, 13 'for the bleaching agent each end in the tooth base of a stator ring.
  • the bore 13 can end not only in the base of the tooth but also at the tip and / or on its side surfaces (see FIG. 5). A distribution over the height of the tooth is also possible.
  • FIG. 6 explains a particularly advantageous embodiment of the method on the basis of a dispersing machine shown in a schematic partial view.
  • the Compression of the fibrous material takes place discontinuously here, ie a high compression zone 17 is first formed, which is then connected downstream to a zone in which the compression is initially lower and into which the bleaching agent B is added.
  • the clothing has a back dam which serves as a barrier to the air carried along.
  • a very good apparatus option for this is the attachment of a toothed ring 15 which can be rotated in the circumferential direction and which, in cooperation with the fitting part lying immediately upstream in front of it, which is also a toothed ring with teeth 12, develops an increased throttling effect.
  • the throttling effect can be easily adjusted in the circumferential direction by slightly rotating the toothed ring 15, since the overlap of the teeth can thereby be changed.
  • the schematically shown adjusting device 16 serves this purpose.
  • discontinuity of the compression has been explained here on the basis of a special toothed ring which can be rotated in the circumferential direction, but toothless, axially displaceable rings or other adjustable throttle elements are also conceivable. In axial machines, too, continuous compression can be carried out without further ado if the teaching described is transferred accordingly.
  • the high compression zone 17 is selected as the initial processing zone of the processing area, which is usually the best solution, the air originally contained, and possibly also the steam, can escape backwards to the screw conveyor 2, i.e. against the direction of transport of the highly consistent fiber S2.
  • the bleaching agent B is advantageously added in the flow direction directly behind the high compression zone 17. In many cases, the fiber material can already be sufficiently dispersed after passing through the high compression zone 17. The mixing effect then predominates in the subsequent part of the processing zone 3.
  • a rotatable toothed ring which resembles the toothed ring 15 at the end of the high compression zone 17, can additionally be present at the end of the clothing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
EP96116115A 1995-12-08 1996-10-09 Procédé pour l'addition d'un agent de blanchiment réducteur à une pâte à papier de haute consistence Expired - Lifetime EP0778370B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545852 1995-12-08
DE19545852A DE19545852A1 (de) 1995-12-08 1995-12-08 Verfahren zur Zugabe von reduzierendem Bleichmittel zu einem hochkonsistenten Papierfaserstoff

Publications (2)

Publication Number Publication Date
EP0778370A1 true EP0778370A1 (fr) 1997-06-11
EP0778370B1 EP0778370B1 (fr) 2002-04-17

Family

ID=7779570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116115A Expired - Lifetime EP0778370B1 (fr) 1995-12-08 1996-10-09 Procédé pour l'addition d'un agent de blanchiment réducteur à une pâte à papier de haute consistence

Country Status (4)

Country Link
EP (1) EP0778370B1 (fr)
AT (1) ATE216443T1 (fr)
DE (2) DE19545852A1 (fr)
NO (1) NO965179L (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009135624A2 (fr) * 2008-05-06 2009-11-12 Axel Wittek Système rotor-stator pour la production de dispersions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716926A (en) * 1951-01-02 1955-09-06 Jackson And Church Company Apparatus for treating wood pulp
WO1987005346A1 (fr) * 1986-03-04 1987-09-11 Sulzer-Escher Wyss Gmbh Blanchissage chimique de consistance elevee a haute temperature
WO1994027713A1 (fr) * 1993-05-24 1994-12-08 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Melangeur, notamment melangeur a grand rendement permettant d'affiner des matieres prebroyees

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716926A (en) * 1951-01-02 1955-09-06 Jackson And Church Company Apparatus for treating wood pulp
WO1987005346A1 (fr) * 1986-03-04 1987-09-11 Sulzer-Escher Wyss Gmbh Blanchissage chimique de consistance elevee a haute temperature
WO1994027713A1 (fr) * 1993-05-24 1994-12-08 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Melangeur, notamment melangeur a grand rendement permettant d'affiner des matieres prebroyees

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009135624A2 (fr) * 2008-05-06 2009-11-12 Axel Wittek Système rotor-stator pour la production de dispersions
WO2009135624A3 (fr) * 2008-05-06 2010-04-15 Axel Wittek Système rotor-stator pour la production de dispersions
US9527048B2 (en) 2008-05-06 2016-12-27 Axel Wittek Rotor-stator system for the production of dispersions

Also Published As

Publication number Publication date
ATE216443T1 (de) 2002-05-15
NO965179L (no) 1997-06-09
NO965179D0 (no) 1996-12-04
DE19545852A1 (de) 1997-06-12
DE59609090D1 (de) 2002-05-23
EP0778370B1 (fr) 2002-04-17

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