IT8522761A0 - Metodo per controllare un processo di imbianchimento ad ossigeno di cellulosa. - Google Patents

Metodo per controllare un processo di imbianchimento ad ossigeno di cellulosa.

Info

Publication number
IT8522761A0
IT8522761A0 IT8522761A IT2276185A IT8522761A0 IT 8522761 A0 IT8522761 A0 IT 8522761A0 IT 8522761 A IT8522761 A IT 8522761A IT 2276185 A IT2276185 A IT 2276185A IT 8522761 A0 IT8522761 A0 IT 8522761A0
Authority
IT
Italy
Prior art keywords
controling
bleaching process
oxygen bleaching
cellulose
cellulose oxygen
Prior art date
Application number
IT8522761A
Other languages
English (en)
Other versions
IT1186185B (it
Inventor
Erkki Malmsten
Original Assignee
Rauma Repola Dy
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 Rauma Repola Dy filed Critical Rauma Repola Dy
Publication of IT8522761A0 publication Critical patent/IT8522761A0/it
Application granted granted Critical
Publication of IT1186185B publication Critical patent/IT1186185B/it

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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1052—Controlling the process
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
IT22761/85A 1984-11-08 1985-11-08 Metodo per controllare un processo di imbianchimento ad ossigeno di cellulosa IT1186185B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI844390A FI71178C (fi) 1984-11-08 1984-11-08 Foerfarande foer reglering av syreblekningsprocess.

Publications (2)

Publication Number Publication Date
IT8522761A0 true IT8522761A0 (it) 1985-11-08
IT1186185B IT1186185B (it) 1987-11-18

Family

ID=8519864

Family Applications (1)

Application Number Title Priority Date Filing Date
IT22761/85A IT1186185B (it) 1984-11-08 1985-11-08 Metodo per controllare un processo di imbianchimento ad ossigeno di cellulosa

Country Status (13)

Country Link
US (1) US4840703A (it)
JP (1) JPS61113889A (it)
AT (1) AT391718B (it)
BR (1) BR8505604A (it)
DE (1) DE3538618A1 (it)
ES (1) ES8701263A1 (it)
FI (1) FI71178C (it)
FR (1) FR2572742B1 (it)
IT (1) IT1186185B (it)
NO (1) NO163910C (it)
SE (1) SE463106B (it)
SU (1) SU1542423A3 (it)
ZA (1) ZA858415B (it)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946555A (en) * 1989-01-19 1990-08-07 Canadian Liquid Air Ltd./Air Liquide Canada Apparatus and method for measuring vent gas flow rates and parameters in pulp and paper processing
US5217574A (en) * 1989-02-15 1993-06-08 Union Camp Patent Holdings Inc. Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp
US5211811A (en) * 1989-02-15 1993-05-18 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification
US5525195A (en) * 1989-02-15 1996-06-11 Union Camp Patent Holding, Inc. Process for high consistency delignification using a low consistency alkali pretreatment
US5409570A (en) * 1989-02-15 1995-04-25 Union Camp Patent Holding, Inc. Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone
US5085734A (en) * 1989-02-15 1992-02-04 Union Camp Patent Holding, Inc. Methods of high consistency oxygen delignification using a low consistency alkali pretreatment
US5188708A (en) * 1989-02-15 1993-02-23 Union Camp Patent Holding, Inc. Process for high consistency oxygen delignification followed by ozone relignification
US5173153A (en) * 1991-01-03 1992-12-22 Union Camp Patent Holding, Inc. Process for enhanced oxygen delignification using high consistency and a split alkali addition
US5164043A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5164044A (en) * 1990-05-17 1992-11-17 Union Camp Patent Holding, Inc. Environmentally improved process for bleaching lignocellulosic materials with ozone
US5441603A (en) * 1990-05-17 1995-08-15 Union Camp Patent Holding, Inc. Method for chelation of pulp prior to ozone delignification
US5403441A (en) * 1992-11-13 1995-04-04 Union Camp Patent Holding, Inc. Method for controlling an ozone bleaching process
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration
US5672247A (en) * 1995-03-03 1997-09-30 Union Camp Patent Holding, Inc. Control scheme for rapid pulp delignification and bleaching
US5736004A (en) * 1995-03-03 1998-04-07 Union Camp Patent Holding, Inc. Control scheme for rapid pulp delignification and bleaching
SE505141C2 (sv) * 1995-10-23 1997-06-30 Sunds Defibrator Ind Ab Syrgasdelignifiering av massa i två steg med hög satsning av alkali och syrgas och temperatur under 90 C i första steget
SE510740C2 (sv) 1996-11-26 1999-06-21 Sunds Defibrator Ind Ab Styrning av syrgasdelignifiering
US6153050A (en) * 1998-03-24 2000-11-28 Noranda Forest Inc. Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage
SE526000C2 (sv) * 2003-11-26 2005-06-14 Kvaerner Pulping Tech Metod och system för att styra tillsättning av syrgas och alkali vid syrgasdelignifiering
EP2085509A3 (en) * 2008-02-01 2010-12-29 Andritz, Inc. Method for measuring and controlling digester or impregnation vessel chip level by means of measuring chip pressure

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1417503A1 (de) * 1952-10-22 1968-10-31 Scholler Dr Jur Heinrich Verfahren zur Herstellung von Zellstoff
US3579417A (en) * 1969-05-12 1971-05-18 Improved Machinery Inc Continuous digester wood chip level control
US3832276A (en) * 1973-03-07 1974-08-27 Int Paper Co Delignification and bleaching of a cellulose pulp slurry with oxygen
SU445033A1 (ru) * 1973-05-25 1974-09-30 Предприятие П/Я Г-4132 Устройство дл регулировани давлени в аппарате непрерывного получени вискозы
SE399966B (sv) * 1973-10-17 1978-03-06 Mo Och Domsjoe Ab Sett att reglera mengden kemiska emnen i inom cellulosaindustrin och beslektade industrier forekommande vetskor
US4192708A (en) * 1974-09-05 1980-03-11 Mo Och Domsjo Aktiebolag Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical
US4198266A (en) * 1977-10-12 1980-04-15 Airco, Inc. Oxygen delignification of wood pulp
SE421019B (sv) * 1980-08-26 1981-11-16 Kamyr Ab Forfarande for kemikaliereglering vid behandling av en substans, speciellt massa, med gas

Also Published As

Publication number Publication date
SE463106B (sv) 1990-10-08
NO854446L (no) 1986-05-09
ATA310985A (de) 1990-05-15
NO163910C (no) 1990-08-08
SE8505246L (sv) 1986-05-09
FR2572742B1 (fr) 1988-06-03
US4840703A (en) 1989-06-20
IT1186185B (it) 1987-11-18
ES548535A0 (es) 1986-12-01
SE8505246D0 (sv) 1985-11-06
ES8701263A1 (es) 1986-12-01
AT391718B (de) 1990-11-26
NO163910B (no) 1990-04-30
DE3538618A1 (de) 1986-07-10
FR2572742A1 (fr) 1986-05-09
JPH024718B2 (it) 1990-01-30
FI844390A0 (fi) 1984-11-08
BR8505604A (pt) 1986-08-12
FI71178C (fi) 1988-05-18
FI844390L (fi) 1986-05-09
ZA858415B (en) 1986-07-30
JPS61113889A (ja) 1986-05-31
FI71178B (fi) 1986-08-14
SU1542423A3 (ru) 1990-02-07

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Legal Events

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TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19931126