SE9301294D0 - METHOD FOR BLACKING OF LIGNOCELLULOSALLY MACHINE - Google Patents

METHOD FOR BLACKING OF LIGNOCELLULOSALLY MACHINE

Info

Publication number
SE9301294D0
SE9301294D0 SE19939301294A SE9301294A SE9301294D0 SE 9301294 D0 SE9301294 D0 SE 9301294D0 SE 19939301294 A SE19939301294 A SE 19939301294A SE 9301294 A SE9301294 A SE 9301294A SE 9301294 D0 SE9301294 D0 SE 9301294D0
Authority
SE
Sweden
Prior art keywords
lignocellulosally
blacking
machine
iii
cpd
Prior art date
Application number
SE19939301294A
Other languages
Swedish (sv)
Other versions
SE9301294L (en
SE501581C2 (en
SE501581E (en
Inventor
*Holtinger Lillemor
*Basta Jiri
*Hermansson Wenche
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 SE9301294A priority Critical patent/SE501581E/en
Publication of SE9301294D0 publication Critical patent/SE9301294D0/en
Priority to AT94200924T priority patent/ATE184060T1/en
Priority to EP94200924A priority patent/EP0622491B2/en
Priority to DE69420306T priority patent/DE69420306T2/en
Priority to FI941764A priority patent/FI941764A/en
Priority to CA002121387A priority patent/CA2121387C/en
Priority to BR9401526A priority patent/BR9401526A/en
Priority to NO941421A priority patent/NO302767B1/en
Publication of SE9301294L publication Critical patent/SE9301294L/en
Publication of SE501581C2 publication Critical patent/SE501581C2/en
Publication of SE501581E publication Critical patent/SE501581E/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

Lignocellulosic pulp (I) is (i) acid treated at pH upto 5 (ii) treated with a complexing agent then (iii) a calcium and a magnesium cpd. added to the pulp at 3.5-9 pH followed by (iv) bleaching with a peroxide contg. cpd. at 7-13 pH. Stages (i) of (iii) may be in any order.
SE9301294A 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching SE501581E (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
SE9301294A SE501581E (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
AT94200924T ATE184060T1 (en) 1993-04-20 1994-04-05 METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE
EP94200924A EP0622491B2 (en) 1993-04-20 1994-04-05 Method for bleaching lignocellulose-containing pulp
FI941764A FI941764A (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulosic pulp
CA002121387A CA2121387C (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulose-containing 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
SE9301294A SE501581E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching

Publications (4)

Publication Number Publication Date
SE9301294D0 true SE9301294D0 (en) 1993-04-20
SE9301294L SE9301294L (en) 1994-10-21
SE501581C2 SE501581C2 (en) 1995-03-20
SE501581E SE501581E (en) 1998-10-26

Family

ID=20389623

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9301294A SE501581E (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) SE501581E (en)

Also Published As

Publication number Publication date
SE9301294L (en) 1994-10-21
SE501581C2 (en) 1995-03-20
SE501581E (en) 1998-10-26

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Legal Events

Date Code Title Description
NUG Patent has lapsed