BR9609840A - Pulp bleaching process and apparatus with gaseous bleaching reagent - Google Patents

Pulp bleaching process and apparatus with gaseous bleaching reagent

Info

Publication number
BR9609840A
BR9609840A BR9609840A BR9609840A BR9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A
Authority
BR
Brazil
Prior art keywords
pulp
bleaching
reagent
vessel
gaseous
Prior art date
Application number
BR9609840A
Other languages
Portuguese (pt)
Inventor
Walter C Vliet
Lewis D Shackford
Allan L 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
Publication of BR9609840A publication Critical patent/BR9609840A/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.
BR9609840A 1995-07-26 1996-07-16 Pulp bleaching process and apparatus with gaseous bleaching reagent BR9609840A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US144795P 1995-07-26 1995-07-26
PCT/US1996/012902 WO1997005327A1 (en) 1995-07-26 1996-07-16 Method and apparatus for bleaching pulp with a gaseous bleaching reagent

Publications (1)

Publication Number Publication Date
BR9609840A true BR9609840A (en) 1999-03-09

Family

ID=21696060

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9609840A BR9609840A (en) 1995-07-26 1996-07-16 Pulp bleaching process and apparatus with gaseous bleaching reagent

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
DE69221385T2 (en) * 1991-05-24 1997-12-11 Union Camp Patent Holding Two-stage pulp bleaching reactor and method for bleaching with ozone
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
EP0840820B1 (en) 1999-04-28
ATE179469T1 (en) 1999-05-15
JPH10510599A (en) 1998-10-13
WO1997005327A1 (en) 1997-02-13
DE69602269D1 (en) 1999-06-02
EP0840820A1 (en) 1998-05-13
CA2227690A1 (en) 1997-02-13
DE69602269T2 (en) 1999-09-16

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Legal Events

Date Code Title Description
FF Decision: intention to grant
FA11 Dismissal: dismissal - article 38, par. 2 of industrial property law