SE8602057L - PROCEDURE FOR WHITENING OF NS-AQ OR SAP MASS - Google Patents

PROCEDURE FOR WHITENING OF NS-AQ OR SAP MASS

Info

Publication number
SE8602057L
SE8602057L SE8602057A SE8602057A SE8602057L SE 8602057 L SE8602057 L SE 8602057L SE 8602057 A SE8602057 A SE 8602057A SE 8602057 A SE8602057 A SE 8602057A SE 8602057 L SE8602057 L SE 8602057L
Authority
SE
Sweden
Prior art keywords
pulp
weight
whitening
procedure
sap
Prior art date
Application number
SE8602057A
Other languages
Swedish (sv)
Other versions
SE8602057D0 (en
Inventor
R Korhonen
I Lassenius
I Ilottu
M Jervinen
T M V Pekuri
Original Assignee
Kymi Stromberg Oy
Yhtyneet Paperitehtaat Oy
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 Kymi Stromberg Oy, Yhtyneet Paperitehtaat Oy filed Critical Kymi Stromberg Oy
Publication of SE8602057D0 publication Critical patent/SE8602057D0/en
Publication of SE8602057L publication Critical patent/SE8602057L/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
    • D21C9/16—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 invention relates to a process for the bleaching of NS-AQ (neutral sulfite anthraquinone) pulp and SAP (semi alkaline pulping) pulp in one step by using a peroxide bleaching solution which contains, calculated from the dry weight of the pulp to be bleached: 1-5 % by weight peroxide, 0-6 % by weight sodium silicate calculated as 38 .degree.Bé waterglass, or a corresponding amount of some other stabilizing agent, and 0-1.5 % by weight sodium salt of diethylene triamine penta-acetic acid (DTPA), and/or some other complexing agent, the pH being adjusted so that the final pH of the pulp is about 8-11, preferably 9-10.
SE8602057A 1985-05-06 1986-05-05 PROCEDURE FOR WHITENING OF NS-AQ OR SAP MASS SE8602057L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI851779A FI76136C (en) 1985-05-06 1985-05-06 FOERFARANDE FOER BLEKNING AV NS-AQ-ELLER SAP MASS.

Publications (2)

Publication Number Publication Date
SE8602057D0 SE8602057D0 (en) 1986-05-05
SE8602057L true SE8602057L (en) 1986-11-07

Family

ID=8520776

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8602057A SE8602057L (en) 1985-05-06 1986-05-05 PROCEDURE FOR WHITENING OF NS-AQ OR SAP MASS

Country Status (3)

Country Link
CA (1) CA1274655A (en)
FI (1) FI76136C (en)
SE (1) SE8602057L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7001484B2 (en) 2000-05-04 2006-02-21 University Of New Brunswick Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent
US8298373B2 (en) 2008-02-07 2012-10-30 University Of New Brunswick Combined process of peroxide bleaching of wood pulps and addition of optical brightening agents

Also Published As

Publication number Publication date
FI851779L (en) 1986-11-07
FI851779A0 (en) 1985-05-06
FI76136B (en) 1988-05-31
SE8602057D0 (en) 1986-05-05
FI76136C (en) 1988-09-09
CA1274655A (en) 1990-10-02

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