SE9500926L - Pulp bleaching process - Google Patents

Pulp bleaching process

Info

Publication number
SE9500926L
SE9500926L SE9500926A SE9500926A SE9500926L SE 9500926 L SE9500926 L SE 9500926L SE 9500926 A SE9500926 A SE 9500926A SE 9500926 A SE9500926 A SE 9500926A SE 9500926 L SE9500926 L SE 9500926L
Authority
SE
Sweden
Prior art keywords
pulp
bleaching process
pulp bleaching
stage
bleaching
Prior art date
Application number
SE9500926A
Other languages
Swedish (sv)
Other versions
SE9500926D0 (en
SE511743C2 (en
SE511743C3 (en
Inventor
Kaj Henricson
Olavi Pikka
Original Assignee
Ahlstroem 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 Ahlstroem Oy filed Critical Ahlstroem Oy
Publication of SE9500926D0 publication Critical patent/SE9500926D0/en
Publication of SE9500926L publication Critical patent/SE9500926L/en
Publication of SE511743C2 publication Critical patent/SE511743C2/en
Publication of SE511743C3 publication Critical patent/SE511743C3/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
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Abstract

Cellulose pulp is treated by (a) treating a pH 2-7 (the acid stage) for at least 10 sec. so that the fibres reach pH 2-7; (b) washing or pressing the pulp; and (c) bleaching the pulp in a multistage sequence at 80-120 deg C in each stage, including at least one peroxide bleaching stage after step (b).
SE9500926A 1994-03-16 1995-03-16 Ozone bleaching at medium concentration and high temperature SE511743C3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI941229A FI98839B (en) 1994-03-16 1994-03-16 Method for bleaching of pulp

Publications (4)

Publication Number Publication Date
SE9500926D0 SE9500926D0 (en) 1995-03-16
SE9500926L true SE9500926L (en) 1995-09-17
SE511743C2 SE511743C2 (en) 1999-11-15
SE511743C3 SE511743C3 (en) 2000-01-10

Family

ID=8540324

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9500926A SE511743C3 (en) 1994-03-16 1995-03-16 Ozone bleaching at medium concentration and high temperature

Country Status (3)

Country Link
CA (1) CA2144825A1 (en)
FI (1) FI98839B (en)
SE (1) SE511743C3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105701B (en) 1995-10-20 2000-09-29 Ahlstrom Machinery Oy Method and arrangement for treatment of pulp
CN113897813B (en) * 2021-09-17 2022-10-04 华南理工大学 Method for bleaching eucalyptus plate bark pulp by ozone in short sequence

Also Published As

Publication number Publication date
SE9500926D0 (en) 1995-03-16
SE511743C2 (en) 1999-11-15
CA2144825A1 (en) 1995-09-17
FI941229A (en) 1995-09-17
FI98839B (en) 1997-05-15
FI941229A0 (en) 1994-03-16
SE511743C3 (en) 2000-01-10

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Legal Events

Date Code Title Description
CANC Patent cancelled, revoked after opposition
NUG Patent has lapsed