SE9601160L - Bleaching of pulp - Google Patents

Bleaching of pulp

Info

Publication number
SE9601160L
SE9601160L SE9601160A SE9601160A SE9601160L SE 9601160 L SE9601160 L SE 9601160L SE 9601160 A SE9601160 A SE 9601160A SE 9601160 A SE9601160 A SE 9601160A SE 9601160 L SE9601160 L SE 9601160L
Authority
SE
Sweden
Prior art keywords
vessel
alkali
pulp
oxygen
fed
Prior art date
Application number
SE9601160A
Other languages
Swedish (sv)
Other versions
SE9601160D0 (en
SE507871C2 (en
Inventor
Kjell Forslund
Monica Bokstroem
Rune Larsson
Matts Sundin
Original Assignee
Sunds Defibrator Ind 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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9601160A priority Critical patent/SE507871C2/en
Publication of SE9601160D0 publication Critical patent/SE9601160D0/en
Priority to US09/155,119 priority patent/US6221207B1/en
Priority to BR9708265A priority patent/BR9708265A/en
Priority to JP9534303A priority patent/JP2000507317A/en
Priority to PCT/SE1997/000392 priority patent/WO1997036042A1/en
Priority to AU23127/97A priority patent/AU2312797A/en
Priority to EP97915790A priority patent/EP0891439A1/en
Priority to ZA9702337A priority patent/ZA972337B/en
Priority to IDP970983A priority patent/ID18754A/en
Publication of SE9601160L publication Critical patent/SE9601160L/en
Publication of SE507871C2 publication Critical patent/SE507871C2/en
Priority to US09/781,480 priority patent/US20010050152A1/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The pulp is fed (1) to a first stage vessel after mixing (2) with oxygen and alkali. Vessel (3) operates at a pressure of over 3 bar. Additional oxygen as hydrogen peroxide with more alkali is mixed (9) and fed to second vessel (4) with low pressure steam for heating purposes. Vessel (4) operates at 90-120 deg C and the pressure is adapted to the operating temperature. Preferably most oxygen and alkali is added to mixer (2) just after pump means (1). Hydrogen peroxide at up to 5Kg per ton and more alkali are added before the downward flowing second treatment vessel (4). Low pressure steam can be used to heat said vessel (4) to a temperature in the range 90-120 deg C. A gas space at the top of vessel(4) allows degassing (6) of the pulp with heat recovery by flashing (5,7) or by heating dilution liquids to further improve the process economy.
SE9601160A 1996-03-26 1996-03-26 Two=stage oxygen delignification of paper pulp SE507871C2 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
SE9601160A SE507871C2 (en) 1996-03-26 1996-03-26 Two=stage oxygen delignification of paper pulp
EP97915790A EP0891439A1 (en) 1996-03-26 1997-03-07 Oxygen delignification of pulp in two stages
PCT/SE1997/000392 WO1997036042A1 (en) 1996-03-26 1997-03-07 Oxygen delignification of pulp in two stages
BR9708265A BR9708265A (en) 1996-03-26 1997-03-07 Two-stage chemical pulp oxygen delignification process
JP9534303A JP2000507317A (en) 1996-03-26 1997-03-07 Pulp delignification with oxygen in two steps.
US09/155,119 US6221207B1 (en) 1996-03-26 1997-03-07 Oxygen delignification of pulp in two stages with low pressure steam heating between stages
AU23127/97A AU2312797A (en) 1996-03-26 1997-03-07 Oxygen delignification of pulp in two stages
ZA9702337A ZA972337B (en) 1996-03-26 1997-03-18 Bleaching of pulp.
IDP970983A ID18754A (en) 1996-03-26 1997-03-25 PAPER BLEACHING BLEACHING
US09/781,480 US20010050152A1 (en) 1996-03-26 2001-02-12 Oxygen delignification of pulp in two stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9601160A SE507871C2 (en) 1996-03-26 1996-03-26 Two=stage oxygen delignification of paper pulp

Publications (3)

Publication Number Publication Date
SE9601160D0 SE9601160D0 (en) 1996-03-26
SE9601160L true SE9601160L (en) 1997-09-27
SE507871C2 SE507871C2 (en) 1998-07-20

Family

ID=20401953

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9601160A SE507871C2 (en) 1996-03-26 1996-03-26 Two=stage oxygen delignification of paper pulp

Country Status (2)

Country Link
SE (1) SE507871C2 (en)
ZA (1) ZA972337B (en)

Also Published As

Publication number Publication date
SE9601160D0 (en) 1996-03-26
ZA972337B (en) 1997-09-17
SE507871C2 (en) 1998-07-20

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Legal Events

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