DE59101249D1 - Process for chlorine-free bleaching and delignification of cellulose. - Google Patents

Process for chlorine-free bleaching and delignification of cellulose.

Info

Publication number
DE59101249D1
DE59101249D1 DE91101890T DE59101249T DE59101249D1 DE 59101249 D1 DE59101249 D1 DE 59101249D1 DE 91101890 T DE91101890 T DE 91101890T DE 59101249 T DE59101249 T DE 59101249T DE 59101249 D1 DE59101249 D1 DE 59101249D1
Authority
DE
Germany
Prior art keywords
cellulose
delignification
cyanamide
content
chlorine
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE91101890T
Other languages
German (de)
Inventor
Werner Dr Sturm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
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 SKW Trostberg AG filed Critical SKW Trostberg AG
Application granted granted Critical
Publication of DE59101249D1 publication Critical patent/DE59101249D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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)
  • Gyroscopes (AREA)
  • Eye Examination Apparatus (AREA)
  • Ultra Sonic Daignosis Equipment (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.
DE91101890T 1990-02-13 1991-02-11 Process for chlorine-free bleaching and delignification of cellulose. Expired - Fee Related DE59101249D1 (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 (1)

Publication Number Publication Date
DE59101249D1 true DE59101249D1 (en) 1994-05-05

Family

ID=6400030

Family Applications (2)

Application Number Title Priority Date Filing Date
DE4004364A Granted 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
DE91101890T Expired - Fee Related DE59101249D1 (en) 1990-02-13 1991-02-11 Process for chlorine-free bleaching and delignification of cellulose.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE4004364A Granted 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

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
CA2099881A1 (en) * 1991-01-03 1992-07-04 Omar F. Ali Chlorine-free process for bleaching 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
ES2051531T3 (en) 1994-06-16
NO910458L (en) 1991-08-14
DE4004364C2 (en) 1992-11-19
CA2036173A1 (en) 1991-08-14
CA2036173C (en) 1996-01-23
EP0442425A1 (en) 1991-08-21
FI910703A0 (en) 1991-02-13
FI910703A (en) 1991-08-14
ATE103649T1 (en) 1994-04-15
NO176329C (en) 1995-03-15
EP0442425B1 (en) 1994-03-30
DE4004364A1 (en) 1991-08-14
NO176329B (en) 1994-12-05
NO910458D0 (en) 1991-02-06

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee