ATE179469T1 - METHOD AND DEVICE FOR BLEACHING PULP USING A GASEOUS BLEACHING AGENT - Google Patents

METHOD AND DEVICE FOR BLEACHING PULP USING A GASEOUS BLEACHING AGENT

Info

Publication number
ATE179469T1
ATE179469T1 AT96928093T AT96928093T ATE179469T1 AT E179469 T1 ATE179469 T1 AT E179469T1 AT 96928093 T AT96928093 T AT 96928093T AT 96928093 T AT96928093 T AT 96928093T AT E179469 T1 ATE179469 T1 AT E179469T1
Authority
AT
Austria
Prior art keywords
pulp
bleaching
vessel
gaseous
reagent
Prior art date
Application number
AT96928093T
Other languages
German (de)
Inventor
Walter C Vliet
Lewis D Shackford
L Allan Carlsmith
Original Assignee
Beloit Technologies Inc
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 Beloit Technologies Inc filed Critical Beloit Technologies Inc
Application granted granted Critical
Publication of ATE179469T1 publication Critical patent/ATE179469T1/en

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
    • 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
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Manipulator (AREA)

Abstract

A method and apparatus for bleaching pulp with a gaseous bleaching reagent. The pulp (18) is intensively mixed in the presence of the bleaching reagent within an upstream vessel comprising a fluffer/blower (12). Next, the pulp is agitated in the presence of the bleaching reagent within an intermediate vessel comprising an agitated mixer reactor (14). The pulp is then discharged to a downstream vessel, comprising a porous bed reactor (16), where it is further reacted with the bleaching reagent. The concentration of the gaseous bleaching reagent supplied to each vessel is separately controlled which, in combination with a controlled pulp residence time within at least the agitated mixer reactor and the porous bed reactor, results in an economy of energy utilization, a minimization of pulp particle damage due to mechanical mixing, and uniformity of pulp bleaching.
AT96928093T 1995-07-26 1996-07-16 METHOD AND DEVICE FOR BLEACHING PULP USING A GASEOUS BLEACHING AGENT ATE179469T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US144795P 1995-07-26 1995-07-26

Publications (1)

Publication Number Publication Date
ATE179469T1 true ATE179469T1 (en) 1999-05-15

Family

ID=21696060

Family Applications (1)

Application Number Title Priority Date Filing Date
AT96928093T ATE179469T1 (en) 1995-07-26 1996-07-16 METHOD AND DEVICE FOR BLEACHING PULP USING A GASEOUS BLEACHING AGENT

Country Status (7)

Country Link
EP (1) EP0840820B1 (en)
JP (1) JPH10510599A (en)
AT (1) ATE179469T1 (en)
BR (1) BR9609840A (en)
CA (1) CA2227690A1 (en)
DE (1) DE69602269T2 (en)
WO (1) WO1997005327A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492040A1 (en) * 1990-12-21 1992-07-01 Kamyr, Inc. Tumbling ozone reactor for paper pulp
EP0492039A1 (en) * 1990-12-27 1992-07-01 Kamyr, Inc. Pneumatic reactor ozone bleaching of paper pulp
CA2046717A1 (en) * 1991-02-06 1992-08-07 Beloit Technologies, Inc. Method and apparatus for treating fibrous materials with a gaseous reagent
NZ242792A (en) * 1991-05-24 1993-12-23 Union Camp Patent Holding Two-stage pulp bleaching reactor: pulp mixed with ozone in first stage.
EP0674731A4 (en) * 1992-12-18 1997-06-18 Ingersoll Rand Co Method and apparatus for regulating wood pulp bleaching.

Also Published As

Publication number Publication date
DE69602269T2 (en) 1999-09-16
EP0840820B1 (en) 1999-04-28
CA2227690A1 (en) 1997-02-13
DE69602269D1 (en) 1999-06-02
EP0840820A1 (en) 1998-05-13
JPH10510599A (en) 1998-10-13
BR9609840A (en) 1999-03-09
WO1997005327A1 (en) 1997-02-13

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Legal Events

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