WO2009087265A3 - Treatment of ozone-containing gas in connection with bleaching of pulp - Google Patents

Treatment of ozone-containing gas in connection with bleaching of pulp Download PDF

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Publication number
WO2009087265A3
WO2009087265A3 PCT/FI2009/000002 FI2009000002W WO2009087265A3 WO 2009087265 A3 WO2009087265 A3 WO 2009087265A3 FI 2009000002 W FI2009000002 W FI 2009000002W WO 2009087265 A3 WO2009087265 A3 WO 2009087265A3
Authority
WO
WIPO (PCT)
Prior art keywords
ozone
gas
bleaching
pulp
residual
Prior art date
Application number
PCT/FI2009/000002
Other languages
French (fr)
Other versions
WO2009087265A2 (en
Inventor
Janne Vehmaa
Original Assignee
Andritz 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 Andritz Oy filed Critical Andritz Oy
Publication of WO2009087265A2 publication Critical patent/WO2009087265A2/en
Publication of WO2009087265A3 publication Critical patent/WO2009087265A3/en

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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

Landscapes

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

Abstract

The present invention relates to a method of and apparatus for decreasing the ozone content of gas in connection with an ozone bleaching process for pulp in a chemical pulp mill plant provided with or connected to an ECF-bleaching plant for pulp and provided with at least production of a mixture of ozone and carrier gas, ozone bleaching equipment, discharge line for mixture of residual ozone and carrier gas from the ozone bleaching equipment and emergency discharge line for ozone-containing gas bypassing the ozone bleaching equipment and after these a connected first gas scrubber for treating the ozone-containing gas. An essential feature of the invention is that the last treatment stage for ozone-containing gas for removing ozone is carried out in the second gas scrubber, wherein both residual gas from ECF bleaching and residual gas of the ozone stage are treated with reductants. Thereby the elimination of residual ozone can be ensured, especially in disturbance situations.
PCT/FI2009/000002 2008-01-08 2009-01-08 Treatment of ozone-containing gas in connection with bleaching of pulp WO2009087265A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20080008A FI20080008L (en) 2008-01-08 2008-01-08 Treatment of ozone-containing gas in connection with pulp bleaching
FI2008008 2008-01-08

Publications (2)

Publication Number Publication Date
WO2009087265A2 WO2009087265A2 (en) 2009-07-16
WO2009087265A3 true WO2009087265A3 (en) 2009-09-03

Family

ID=39004236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2009/000002 WO2009087265A2 (en) 2008-01-08 2009-01-08 Treatment of ozone-containing gas in connection with bleaching of pulp

Country Status (2)

Country Link
FI (1) FI20080008L (en)
WO (1) WO2009087265A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3970835A1 (en) * 2020-09-22 2022-03-23 SUEZ Groupe Ozone scrubber and ozone scrubbing method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526383A1 (en) * 1991-08-01 1993-02-03 Union Camp Patent Holding, Inc. Process and apparatus for conditioning ozone gas recycle stream in ozone pulp bleaching
WO1993018226A1 (en) * 1992-03-02 1993-09-16 Kamyr, Inc. Combined ozone destruction and fiber scrubbing in paper pulp mills
WO1994020675A1 (en) * 1993-03-02 1994-09-15 Kamyr, Inc. Zero discharge mill distillation, salt recovery, and water management
WO1997006305A1 (en) * 1995-08-07 1997-02-20 Beloit Technologies, Inc. Method for reprocessing an ozone-containing gas present in a pulp bleaching plant
US6210527B1 (en) * 1994-03-14 2001-04-03 The Boc Group, Inc. Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream
WO2002043838A2 (en) * 2000-12-01 2002-06-06 Linde Aktiengesellschaft Method for the treatment of waste gas from a cellulose plant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526383A1 (en) * 1991-08-01 1993-02-03 Union Camp Patent Holding, Inc. Process and apparatus for conditioning ozone gas recycle stream in ozone pulp bleaching
WO1993018226A1 (en) * 1992-03-02 1993-09-16 Kamyr, Inc. Combined ozone destruction and fiber scrubbing in paper pulp mills
WO1994020675A1 (en) * 1993-03-02 1994-09-15 Kamyr, Inc. Zero discharge mill distillation, salt recovery, and water management
US6210527B1 (en) * 1994-03-14 2001-04-03 The Boc Group, Inc. Pulp bleaching method wherein an ozone bleaching waste stream is scrubbed to form an oxygen containing stream
WO1997006305A1 (en) * 1995-08-07 1997-02-20 Beloit Technologies, Inc. Method for reprocessing an ozone-containing gas present in a pulp bleaching plant
WO2002043838A2 (en) * 2000-12-01 2002-06-06 Linde Aktiengesellschaft Method for the treatment of waste gas from a cellulose plant

Also Published As

Publication number Publication date
FI20080008L (en) 2009-07-09
WO2009087265A2 (en) 2009-07-16
FI20080008A0 (en) 2008-01-08

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