FI945139A - Chlorine-free bleaching with short bleaching sequence and recirculation of filtrate - Google Patents

Chlorine-free bleaching with short bleaching sequence and recirculation of filtrate Download PDF

Info

Publication number
FI945139A
FI945139A FI945139A FI945139A FI945139A FI 945139 A FI945139 A FI 945139A FI 945139 A FI945139 A FI 945139A FI 945139 A FI945139 A FI 945139A FI 945139 A FI945139 A FI 945139A
Authority
FI
Finland
Prior art keywords
bleaching
recirculation
filtrate
chlorine
short
Prior art date
Application number
FI945139A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI945139A0 (en
Inventor
Kaj Henricson
Olavi Pikka
Bertil Stromberg
Original Assignee
Ahlstroem Oy
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 Ahlstroem Oy filed Critical Ahlstroem Oy
Publication of FI945139A0 publication Critical patent/FI945139A0/en
Publication of FI945139A publication Critical patent/FI945139A/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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • 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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
FI945139A 1993-11-03 1994-11-01 Chlorine-free bleaching with short bleaching sequence and recirculation of filtrate FI945139A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14486993A 1993-11-03 1993-11-03

Publications (2)

Publication Number Publication Date
FI945139A0 FI945139A0 (en) 1994-11-01
FI945139A true FI945139A (en) 1995-05-04

Family

ID=22510496

Family Applications (1)

Application Number Title Priority Date Filing Date
FI945139A FI945139A (en) 1993-11-03 1994-11-01 Chlorine-free bleaching with short bleaching sequence and recirculation of filtrate

Country Status (3)

Country Link
CA (1) CA2134730C (en)
FI (1) FI945139A (en)
SE (2) SE516814C2 (en)

Also Published As

Publication number Publication date
SE0103975L (en) 2001-12-10
CA2134730A1 (en) 1995-05-04
SE516814C2 (en) 2002-03-05
CA2134730C (en) 2003-12-30
SE9403756L (en) 1995-05-04
FI945139A0 (en) 1994-11-01
SE9403756D0 (en) 1994-11-02

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Legal Events

Date Code Title Description
GB Transfer or assigment of application

Owner name: AHLSTROM MACHINERY OY