FI910703A - FOERFARANDE FOER KLORFRI BLEKNING OCH DELIGNIFIERING AV CELLULOSA. - Google Patents

FOERFARANDE FOER KLORFRI BLEKNING OCH DELIGNIFIERING AV CELLULOSA. Download PDF

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Publication number
FI910703A
FI910703A FI910703A FI910703A FI910703A FI 910703 A FI910703 A FI 910703A FI 910703 A FI910703 A FI 910703A FI 910703 A FI910703 A FI 910703A FI 910703 A FI910703 A FI 910703A
Authority
FI
Finland
Prior art keywords
klorfri
delignifiering
blekning
cellulosa
och
Prior art date
Application number
FI910703A
Other languages
Finnish (fi)
Other versions
FI910703A0 (en
Inventor
Werner Sturm
Original Assignee
Sueddeutsche Kalkstickstoff
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 Sueddeutsche Kalkstickstoff filed Critical Sueddeutsche Kalkstickstoff
Publication of FI910703A0 publication Critical patent/FI910703A0/en
Publication of FI910703A publication Critical patent/FI910703A/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
    • 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
    • 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
    • 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)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Eye Examination Apparatus (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Gyroscopes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Cereal-Derived Products (AREA)

Abstract

Cl-free bleaching and delignification of cellulose pre-bleached with O2 and peroxide, or O2 and O3, involves a 2-stage treatment with peroxide activated with cyanamide and/or cyanamide salts. - In the first stage, the content of cyanamide and/or cyanamide salts is 0.05-0.5 (0.07-0.33) wt.%, and the peroxide content is 0.1-1 wt.%, both w.r.t. dry wt. of cellulose. In the second stage, the content of cyanamide is 0.01-0.3 (0.03-0.23) wt.%, and the peroxide content is 0.1-0.7 wt.%, w.r.t. dry wt. of cellulose. Both stages are at pH 10-12, solids content of 5-30 (7-20) wt.%, and 40-90 (55-80) deg.C, for 1-6h for each stage.
FI910703A 1990-02-13 1991-02-13 FOERFARANDE FOER KLORFRI BLEKNING OCH DELIGNIFIERING AV CELLULOSA. FI910703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4004364A DE4004364A1 (en) 1990-02-13 1990-02-13 Bleaching and delignifying pre-balanced cellulose - in two stages with peroxide activated with cyanamide or cyanamide salt, avoiding agents contg. chlorine

Publications (2)

Publication Number Publication Date
FI910703A0 FI910703A0 (en) 1991-02-13
FI910703A true FI910703A (en) 1991-08-14

Family

ID=6400030

Family Applications (1)

Application Number Title Priority Date Filing Date
FI910703A FI910703A (en) 1990-02-13 1991-02-13 FOERFARANDE FOER KLORFRI BLEKNING OCH DELIGNIFIERING AV CELLULOSA.

Country Status (7)

Country Link
EP (1) EP0442425B1 (en)
AT (1) ATE103649T1 (en)
CA (1) CA2036173C (en)
DE (2) DE4004364A1 (en)
ES (1) ES2051531T3 (en)
FI (1) FI910703A (en)
NO (1) NO176329C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031597A1 (en) * 1990-10-05 1992-04-09 Sueddeutsche Kalkstickstoff METHOD FOR LOW-CHLORINE BLEACHING AND DELIGNIFICATION OF CELLULAR
BR9205490A (en) * 1991-01-03 1994-04-05 Union Camp Patent Holding Processes for the manufacture of bleached pulp having a final GE britho of at least about 75 and for the delignification and bleaching of a lignocellulosic pulp
DE4138006A1 (en) * 1991-11-19 1993-05-27 Degussa METHOD FOR IMPROVING THE WHITE CONTENT IN THE PEROXIDE BLEACHING OF CELLULAS BY THE ADDITION OF CYANATES
US5620563A (en) * 1994-10-31 1997-04-15 Pulp Paper Res Inst Process for delignification and bleaching of chemical wood pulps with hydrogen peroxide and a dicyandiamide activator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196043A (en) * 1970-12-21 1980-04-01 Scott Paper Company Kraft pulp bleaching and recovery process
DE3544398A1 (en) * 1985-12-16 1987-06-19 Sueddeutsche Kalkstickstoff METHOD FOR THE BLEACHING AND DELIGNIFICATION OF CELLULAR-BASED PRODUCTS
DE3714107A1 (en) * 1987-04-28 1988-11-10 Sueddeutsche Kalkstickstoff Process for eliminating residual hydrogen peroxide from aqueous solutions
DE3802401A1 (en) * 1988-01-28 1989-08-03 Degussa METHOD FOR PRODUCING SEMI-BLEACHED FUEL

Also Published As

Publication number Publication date
NO910458D0 (en) 1991-02-06
NO176329C (en) 1995-03-15
CA2036173A1 (en) 1991-08-14
ES2051531T3 (en) 1994-06-16
DE4004364A1 (en) 1991-08-14
EP0442425A1 (en) 1991-08-21
DE59101249D1 (en) 1994-05-05
DE4004364C2 (en) 1992-11-19
EP0442425B1 (en) 1994-03-30
CA2036173C (en) 1996-01-23
NO910458L (en) 1991-08-14
FI910703A0 (en) 1991-02-13
ATE103649T1 (en) 1994-04-15
NO176329B (en) 1994-12-05

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Legal Events

Date Code Title Description
FD Application lapsed