FI974115A - Massan käsittely kelatointiaineella ja seuraava valkaisu pH-arvossa yli 9 - Google Patents

Massan käsittely kelatointiaineella ja seuraava valkaisu pH-arvossa yli 9 Download PDF

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Publication number
FI974115A
FI974115A FI974115A FI974115A FI974115A FI 974115 A FI974115 A FI 974115A FI 974115 A FI974115 A FI 974115A FI 974115 A FI974115 A FI 974115A FI 974115 A FI974115 A FI 974115A
Authority
FI
Finland
Prior art keywords
pulp
treatment
chelating agent
subsequent bleaching
bleaching
Prior art date
Application number
FI974115A
Other languages
English (en)
Swedish (sv)
Other versions
FI974115A0 (fi
Inventor
Rolf Boman
Ulf Germgaord
Jonas Lindquist
Kenneth Hafvenstroem
Original Assignee
Sunds Defibrator Ind Ab
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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Publication of FI974115A publication Critical patent/FI974115A/fi
Publication of FI974115A0 publication Critical patent/FI974115A0/fi

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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
    • D21C9/1026—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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
FI974115A 1995-05-02 1997-11-03 Massan käsittely kelatointiaineella ja seuraava valkaisu pH-arvossa yli 9 FI974115A0 (fi)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501623A SE9501623L (sv) 1995-05-02 1995-05-02 Blekning av massa
PCT/SE1996/000405 WO1996035015A1 (en) 1995-05-02 1996-03-27 TREATMENT OF PULP WITH CHELATING AGENT AND SUBSEQUENT BLEACHING AT A pH VALUE ABOVE 9

Publications (2)

Publication Number Publication Date
FI974115A true FI974115A (fi) 1997-11-03
FI974115A0 FI974115A0 (fi) 1997-11-03

Family

ID=20398166

Family Applications (1)

Application Number Title Priority Date Filing Date
FI974115A FI974115A0 (fi) 1995-05-02 1997-11-03 Massan käsittely kelatointiaineella ja seuraava valkaisu pH-arvossa yli 9

Country Status (6)

Country Link
JP (1) JPH11504399A (fi)
CA (1) CA2219767A1 (fi)
FI (1) FI974115A0 (fi)
NO (1) NO975038D0 (fi)
SE (1) SE9501623L (fi)
WO (1) WO1996035015A1 (fi)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509444C2 (sv) * 1997-05-14 1999-01-25 Mo Och Domsjoe Ab Förfarande för minimering av kalcium orsakat inkrustproblem vid framställning av blekt cellulosamassa
CA2310278A1 (en) * 1997-11-25 1999-06-03 Amylum Belgium N.V. Improvements to the bleaching process for chemical pulp and intermediate pulp dispersions
BE1011785A3 (fr) * 1998-03-10 2000-01-11 Solvay Procede de blanchiment et/ou de delignification de pates a papier chimiques.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2096441T3 (es) * 1992-11-27 1997-03-01 Eka Chemicals Ab Procedimiento para deslignificar pasta que contiene lignocelulosa.
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration

Also Published As

Publication number Publication date
NO975038L (no) 1997-10-31
CA2219767A1 (en) 1996-11-07
WO1996035015A1 (en) 1996-11-07
SE9501623D0 (sv) 1995-05-02
JPH11504399A (ja) 1999-04-20
NO975038D0 (no) 1997-10-31
FI974115A0 (fi) 1997-11-03
SE9501623L (sv) 1996-11-03

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