WO2000043589B1 - Treatment of recirculated filtrates in pulp production - Google Patents

Treatment of recirculated filtrates in pulp production

Info

Publication number
WO2000043589B1
WO2000043589B1 PCT/FI2000/000045 FI0000045W WO0043589B1 WO 2000043589 B1 WO2000043589 B1 WO 2000043589B1 FI 0000045 W FI0000045 W FI 0000045W WO 0043589 B1 WO0043589 B1 WO 0043589B1
Authority
WO
WIPO (PCT)
Prior art keywords
stage
washing
fraction
digester
cod
Prior art date
Application number
PCT/FI2000/000045
Other languages
French (fr)
Other versions
WO2000043589A1 (en
Inventor
Olavi Pikka
Pekka Tervola
Janne Vehmaa
Original Assignee
Andritz Ahlstrom Oy
Olavi Pikka
Pekka Tervola
Janne Vehmaa
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 Andritz Ahlstrom Oy, Olavi Pikka, Pekka Tervola, Janne Vehmaa filed Critical Andritz Ahlstrom Oy
Priority to AU22974/00A priority Critical patent/AU2297400A/en
Priority to CA002360638A priority patent/CA2360638A1/en
Publication of WO2000043589A1 publication Critical patent/WO2000043589A1/en
Publication of WO2000043589B1 publication Critical patent/WO2000043589B1/en
Priority to SE0102387A priority patent/SE0102387D0/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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants

Abstract

The present invention relates to a method of treating pulp. The method according to the invention is particularly well suited for intensifying the washing of fiber suspensions in the wood processing industry in cases where liquid recycled from later washing stages is used as washing liquid. According to a preferred embodiment of the invention part of the washing liquid to be fed to a washer is separated to form a separate flow, which is divided into a cleaner and a fouler fraction that are returned to appropriate locations of the process.

Claims

AMENDED CLAIMS
[received by the International Bureau on 20 June 2000 (20 06 00). original claim 1 amended. remaining claims unchanged (1 page)]
1 A method of treating pulp according to which method wood material is supplied into a digester (2), the so-called brown stock is discharged from the digester to brown stock washing (8) and the washed pulp is, if desired, treated in a delignification stage (10) whereby the pulp digestion and brown stock washing processes mainly employ counter-current washing in which clean wash liquid is brought to the end of the process and transferred counter-currently relative to the flow direction of the fiber suspension through several washing stages at least partly to the digester (2) and from there further to chemical recovery CR, characterized that in order to lower the COD-level in the oxygen delignification stage (10), a) a portion LI is separated before the process stage subsequent to the delignification stage ( 10) and the washer (12) of the delignification stage from the wash liquid/filtrate to be recycled counter-currently; b) the portion LI of the filtrate is treated in a separation device (114, 214,
314, 414, 514) in order to produce two fractions CC and CD having different physical properties; c) the fraction CC having a lower physical property is returned either substantially to the same point the process from which the portion LI of the filtrate was extracted at stage (a), or to some other process stage in order to lower the COD- level in the oxygen delignification stage. d) the fraction CD having a higher physical property is directed either to the flow passing to the chemical recovery CR. the digestion plant or as such to a point in the process in which the dry-solids. COD and /or alkali content of the liquid phase is at least as hi eh as that of the fraction CD
PCT/FI2000/000045 1999-01-22 2000-01-20 Treatment of recirculated filtrates in pulp production WO2000043589A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU22974/00A AU2297400A (en) 1999-01-22 2000-01-20 Treatment of recirculated filtrates in pulp production
CA002360638A CA2360638A1 (en) 1999-01-22 2000-01-20 Treatment of recirculated filtrates in pulp production
SE0102387A SE0102387D0 (en) 1999-01-22 2001-07-04 Treatment of recirculated filtrates in pulp production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990127A FI990127A0 (en) 1999-01-22 1999-01-22 Process for treating pulp
FI990127 1999-01-22

Publications (2)

Publication Number Publication Date
WO2000043589A1 WO2000043589A1 (en) 2000-07-27
WO2000043589B1 true WO2000043589B1 (en) 2000-10-12

Family

ID=8553467

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000045 WO2000043589A1 (en) 1999-01-22 2000-01-20 Treatment of recirculated filtrates in pulp production

Country Status (5)

Country Link
AU (1) AU2297400A (en)
CA (1) CA2360638A1 (en)
FI (1) FI990127A0 (en)
SE (1) SE0102387D0 (en)
WO (1) WO2000043589A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115977B2 (en) * 2003-04-07 2019-03-29 Stora Enso Oyj Purification of alkaline washing liquid
WO2015197917A1 (en) * 2014-06-23 2015-12-30 Metsä Fibre Oy Method of delignifying fibrous suspensions of alkaline cooking
SE538452C2 (en) * 2014-11-07 2016-07-05 Valmet Oy Method for operating a two vessel digester system
SE542676C2 (en) 2017-11-29 2020-06-23 Axolot Solutions Ab Method and a system for washing paper pulp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI85293C (en) * 1990-05-04 1992-03-25 Poeyry Jaakko & Co Oy FOERFARANDE FOER RENING OCH AOTERFOERING AV CELLULOSAFABRIKERS BLEKERIAVATTEN.
SE470538C (en) * 1992-12-02 1996-01-11 Kvaerner Pulping Tech When bleaching pulp, use no chlorine-containing chemicals
SE501613C2 (en) * 1993-08-03 1995-03-27 Kvaerner Pulping Tech Method of integrating bleaching and recycling in pulp production

Also Published As

Publication number Publication date
CA2360638A1 (en) 2000-07-27
AU2297400A (en) 2000-08-07
SE0102387L (en) 2001-07-04
FI990127A0 (en) 1999-01-22
WO2000043589A1 (en) 2000-07-27
SE0102387D0 (en) 2001-07-04

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