SE9301293L - Process for bleaching lignocellulosic pulp - Google Patents

Process for bleaching lignocellulosic pulp

Info

Publication number
SE9301293L
SE9301293L SE9301293A SE9301293A SE9301293L SE 9301293 L SE9301293 L SE 9301293L SE 9301293 A SE9301293 A SE 9301293A SE 9301293 A SE9301293 A SE 9301293A SE 9301293 L SE9301293 L SE 9301293L
Authority
SE
Sweden
Prior art keywords
cpd
lignocellulosic pulp
bleaching lignocellulosic
bleaching
ions
Prior art date
Application number
SE9301293A
Other languages
Swedish (sv)
Other versions
SE501651E (en
SE501651C2 (en
Inventor
Lillemor Holtinger
Jiri Basta
Wenche Hermansson
Original Assignee
Eka Nobel 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 Eka Nobel Ab filed Critical Eka Nobel Ab
Priority to SE9301293A priority Critical patent/SE501651E/en
Priority to DE69420306T priority patent/DE69420306T2/en
Priority to EP94200924A priority patent/EP0622491B2/en
Priority to AT94200924T priority patent/ATE184060T1/en
Priority to CA002121387A priority patent/CA2121387C/en
Priority to FI941764A priority patent/FI941764A/en
Priority to BR9401526A priority patent/BR9401526A/en
Priority to NO941421A priority patent/NO302767B1/en
Publication of SE9301293L publication Critical patent/SE9301293L/en
Publication of SE501651C2 publication Critical patent/SE501651C2/en
Publication of SE501651E publication Critical patent/SE501651E/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
    • D21C9/1026—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)

Abstract

The process, using a peroxide-contg cpd, comprises: (i) treating the material at a pH up to 5 with a complexing agent in an opt. appts; (ii) adding a Mg cpd. and a Ca cpd. at a pH of 3.5 to 8 in order to reinsert Mg and Ca ions in the material; (iii) washing or rinsing the material with a fluid with a pH greater than 4 to remove unwanted metal ions; and (iv) bleaching the material at pH increments from 7 to 13.
SE9301293A 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching SE501651E (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching
DE69420306T DE69420306T2 (en) 1993-04-20 1994-04-05 Process for bleaching lignocellulosic pulp
EP94200924A EP0622491B2 (en) 1993-04-20 1994-04-05 Method for bleaching lignocellulose-containing pulp
AT94200924T ATE184060T1 (en) 1993-04-20 1994-04-05 METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE
CA002121387A CA2121387C (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulose-containing pulp
FI941764A FI941764A (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulosic pulp
BR9401526A BR9401526A (en) 1993-04-20 1994-04-18 Process for bleaching pulp containing ligno-cellulose
NO941421A NO302767B1 (en) 1993-04-20 1994-04-19 Process of bleaching lignocellulosic pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching

Publications (3)

Publication Number Publication Date
SE9301293L true SE9301293L (en) 1994-10-21
SE501651C2 SE501651C2 (en) 1995-04-03
SE501651E SE501651E (en) 1998-10-26

Family

ID=20389622

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching

Country Status (1)

Country Link
SE (1) SE501651E (en)

Also Published As

Publication number Publication date
SE501651E (en) 1998-10-26
SE501651C2 (en) 1995-04-03

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Legal Events

Date Code Title Description
NUG Patent has lapsed