EP0816558A1 - Procédé d'amélioration du dégré de blancheur de pâte à papier - Google Patents

Procédé d'amélioration du dégré de blancheur de pâte à papier Download PDF

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Publication number
EP0816558A1
EP0816558A1 EP97108991A EP97108991A EP0816558A1 EP 0816558 A1 EP0816558 A1 EP 0816558A1 EP 97108991 A EP97108991 A EP 97108991A EP 97108991 A EP97108991 A EP 97108991A EP 0816558 A1 EP0816558 A1 EP 0816558A1
Authority
EP
European Patent Office
Prior art keywords
bleaching
bleaching process
whiteness
gas
increasing
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
EP97108991A
Other languages
German (de)
English (en)
Other versions
EP0816558B1 (fr
Inventor
Volker Dr. Gehr
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 EP0816558A1 publication Critical patent/EP0816558A1/fr
Application granted granted Critical
Publication of EP0816558B1 publication Critical patent/EP0816558B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 invention relates to a method for increasing the whiteness of Paper fibers according to the preamble of claim 1.
  • DE-AS 19 54 267 describes a method for delignifying cellulosic material, in which pulp is to be produced by breaking down and dissolving out lignin.
  • a delignification step with an alkaline extraction is proposed, the effect of which is improved by O 2 or air.
  • a Mg compound is added which protects the carbohydrates, ie the cellulose, from chain degradation and thereby prevents the strength of the pulp produced from being reduced.
  • a significant increase in the degree of whiteness cannot be achieved with this method, at best a preparation for a subsequent whiteness-increasing bleach.
  • Bleaching and delignification are different chemical processes with different effects and parameters, even if the term "bleaching" is sometimes used for delignification in somewhat sloppy usage.
  • the subclaims describe particularly advantageous embodiments of the Procedure. Different directions can be followed. As you know, change the flow properties of the fiber material are in the material density range above 5% considerable, depending on how the consistency is chosen for the machining process. Here, e.g. the range between approx. 5 and 12% often as the medium density range and which is referred to as high density or high consistency. There are some indications that the medium density range for the process according to the invention brings special advantages, since the flow properties are still relatively good, although already a high mass concentration in the bleaching vessel is possible. With a bleaching vessel Reactor meant in which the pressurized pulp with the Bleaching chemicals and the above Gas mixture reacts.
  • the residence time in which the bleaching process takes place also has an effect on the effect of the Procedure.
  • the exact time at which the process runs optimally depends on of course, depending on a variety of boundary conditions. It is often also a economical compromise, since long dwell times improve the effect can, but also require large reaction vessels.
  • Waste paper P is suspended in hot water W and, at a consistency of approx. 12%, mixed with chemicals CH in a mixer 1, that is 1% peroxide, 1% NaOH and other auxiliary chemicals.
  • the suspension is then conveyed into the pressurized reaction vessel 3 using a medium density pump 2. If the chemicals CH 'are added immediately before the medium density pump 2, this can also function as a mixing pump.
  • the reaction vessel 3, in which the substance can remain for about 15 minutes, is designed as an upward-flowing reaction tower. Heated room air A is blown into this vessel at 80 ° C.
  • the fiber material treated in this way passes through a blow-out opening 5 into a collecting vessel 6, where it is diluted with water W '.
  • the system diagram only shows the actual bleaching section.
  • Raw material and requirements are a number of further process steps before and then necessary, e.g. around printed and / or colored waste paper to a white Process quality.
  • contaminants have to be removed cannot or should not be bleached.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP97108991A 1996-06-29 1997-06-04 Procédé d'amélioration du dégré de blancheur de pâte à papier à partir de papier recyclé Expired - Lifetime EP0816558B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19626200 1996-06-29
DE19626200A DE19626200C2 (de) 1996-06-29 1996-06-29 Verfahren zur Erhöhung des Weißgrades von Altpapierfaserstoff

Publications (2)

Publication Number Publication Date
EP0816558A1 true EP0816558A1 (fr) 1998-01-07
EP0816558B1 EP0816558B1 (fr) 2001-12-05

Family

ID=7798439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97108991A Expired - Lifetime EP0816558B1 (fr) 1996-06-29 1997-06-04 Procédé d'amélioration du dégré de blancheur de pâte à papier à partir de papier recyclé

Country Status (4)

Country Link
EP (1) EP0816558B1 (fr)
AT (1) ATE210217T1 (fr)
CA (1) CA2208940A1 (fr)
DE (1) DE19626200C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118223324A (zh) * 2023-12-27 2024-06-21 湖南中烟工业有限责任公司 一种加热卷烟用接装纸原纸的生产方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19751173A1 (de) * 1997-11-19 1999-05-27 Voith Sulzer Papiertech Patent Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954267A1 (de) * 1968-10-29 1970-06-25 Mo Och Domsjoe Ab Verfahren zur Behandlung von cellulosehaltigen Materialien
US3754417A (en) * 1970-01-08 1973-08-28 Canadian Ind Oxygen bleaching
JPS49101601A (fr) * 1973-02-07 1974-09-26
JPS517203A (en) * 1974-07-10 1976-01-21 Sadayoshi Watanabe Arukariekifurikakeo tokuchotosuru kapponkashokubutsuparupuno sansosankaseizoho
EP0165867A1 (fr) * 1984-06-15 1985-12-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de blanchiment de pâte mécanique par le peroxyde d'hydrogène
JPH0364589A (ja) * 1989-07-28 1991-03-19 Mitsubishi Gas Chem Co Inc 化学パルプの漂白方法
US5211809A (en) * 1991-05-21 1993-05-18 Air Products And Chemicals, Inc,. Dye removal in oxygen color stripping of secondary fibers
EP0557651A1 (fr) * 1992-02-24 1993-09-01 Scott Paper Company Procédé intégré de mise en pâte de vieux papiers, donnant des fibres aptes à faire du tissue

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954267A1 (de) * 1968-10-29 1970-06-25 Mo Och Domsjoe Ab Verfahren zur Behandlung von cellulosehaltigen Materialien
US3754417A (en) * 1970-01-08 1973-08-28 Canadian Ind Oxygen bleaching
JPS49101601A (fr) * 1973-02-07 1974-09-26
JPS517203A (en) * 1974-07-10 1976-01-21 Sadayoshi Watanabe Arukariekifurikakeo tokuchotosuru kapponkashokubutsuparupuno sansosankaseizoho
EP0165867A1 (fr) * 1984-06-15 1985-12-27 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de blanchiment de pâte mécanique par le peroxyde d'hydrogène
JPH0364589A (ja) * 1989-07-28 1991-03-19 Mitsubishi Gas Chem Co Inc 化学パルプの漂白方法
US5211809A (en) * 1991-05-21 1993-05-18 Air Products And Chemicals, Inc,. Dye removal in oxygen color stripping of secondary fibers
EP0557651A1 (fr) * 1992-02-24 1993-09-01 Scott Paper Company Procédé intégré de mise en pâte de vieux papiers, donnant des fibres aptes à faire du tissue

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7528, Derwent World Patents Index; Class E33, AN 75-46613W, XP002035552 *
DATABASE WPI Section Ch Week 7610, Derwent World Patents Index; Class F09, AN 76-17674X, XP002035553 *
DATABASE WPI Section Ch Week 9118, Derwent World Patents Index; Class E37, AN 91-127527, XP002035554 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118223324A (zh) * 2023-12-27 2024-06-21 湖南中烟工业有限责任公司 一种加热卷烟用接装纸原纸的生产方法

Also Published As

Publication number Publication date
DE19626200C2 (de) 2001-02-01
CA2208940A1 (fr) 1997-12-29
DE19626200A1 (de) 1997-05-15
EP0816558B1 (fr) 2001-12-05
ATE210217T1 (de) 2001-12-15

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