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ZA945265B - Oxygen delignification method incorporating wood pulp mixing apparatus - Google Patents

Oxygen delignification method incorporating wood pulp mixing apparatus

Info

Publication number
ZA945265B
ZA945265B ZA945265A ZA945265A ZA945265B ZA 945265 B ZA945265 B ZA 945265B ZA 945265 A ZA945265 A ZA 945265A ZA 945265 A ZA945265 A ZA 945265A ZA 945265 B ZA945265 B ZA 945265B
Authority
ZA
South Africa
Prior art keywords
wood pulp
mixing apparatus
oxygen delignification
method incorporating
pulp mixing
Prior art date
Application number
ZA945265A
Other languages
English (en)
Inventor
Mark J Kirschner
Rustam H Sethna
Original Assignee
Boc Group Inc
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 Boc Group Inc filed Critical Boc Group Inc
Publication of ZA945265B publication Critical patent/ZA945265B/xx

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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • 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)
ZA945265A 1993-08-12 1994-07-19 Oxygen delignification method incorporating wood pulp mixing apparatus ZA945265B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/105,248 US5460696A (en) 1993-08-12 1993-08-12 Oxygen delignification method incorporating wood pulp mixing apparatus

Publications (1)

Publication Number Publication Date
ZA945265B true ZA945265B (en) 1995-04-21

Family

ID=22304796

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA945265A ZA945265B (en) 1993-08-12 1994-07-19 Oxygen delignification method incorporating wood pulp mixing apparatus

Country Status (7)

Country Link
US (2) US5460696A (xx)
EP (1) EP0641883A3 (xx)
AU (1) AU670201B2 (xx)
CA (1) CA2127654C (xx)
FI (1) FI117478B (xx)
NO (1) NO303291B1 (xx)
ZA (1) ZA945265B (xx)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516489E8 (sv) † 1995-03-28 2015-10-20 Glv Fin Hungary Kft Sätt vid och utrustning för behandling av en fibermassasuspension
BR9708265A (pt) * 1996-03-26 1999-04-13 Sunds Defibrator Ind Ab Processo de deslignificação por oxigénio de pasta química em dois estágios
SE522593C2 (sv) * 1999-07-06 2004-02-24 Kvaerner Pulping Tech System och förfarande för syragasdelignifiering av massa av lignocellulosahaltigt material
DE10163303B4 (de) * 2001-12-21 2004-04-01 Rhodia Acetow Gmbh Verfahren zur Verbesserung der Farbzahl von Celluloseestern
SE525773C2 (sv) * 2003-09-24 2005-04-26 Kvaerner Pulping Tech Metod och arrangemang för syrgasdelignifiering av cellulosamassa med pH-reglering i slutfasen
US20050087315A1 (en) * 2003-10-28 2005-04-28 Donovan Joseph R. Low consistency oxygen delignification process
SE526843C2 (sv) * 2004-12-30 2005-11-08 Kvaerner Pulping Tech Metod för syrgasdelignifiering av cellulosamassa vid högt tryck i flera steg
SE526707C2 (sv) * 2004-12-30 2005-10-25 Kvaerner Pulping Tech Metod för syrgasdelignifiering av cellulosamassa med inmixning av kemikalier vid högt tryck

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843473A (en) * 1971-08-23 1974-10-22 Mo Och Domsjoe Ab Impregnation of cellulosic pulp under superatmospheric pressure with waste alkaline oxygan gas bleaching liquor followed by oxygen-alkali bleaching
SE387671B (sv) * 1973-04-27 1976-09-13 Mo Och Domsjoe Ab Anordning for blekning av kompakt, icke fluffat vetskehaltigt lignocellulosamaterial med gasformiga blekmedel, foretredesvis syrgas
SE379069B (xx) * 1973-08-27 1975-09-22 Kamyr Ab
SE390549C (sv) * 1973-12-20 1986-04-14 Ahlstroem Oy Sett att bleka cellulosahaltigt material med syre eller fritt syre innehallande gas i alkalisk miljo
US4089737A (en) * 1974-02-18 1978-05-16 Toyo Pulp Company, Ltd. Delignification of cellulosic material with an alkaline aqueous medium containing oxygen dissolved therein
US3951733A (en) * 1974-11-06 1976-04-20 International Paper Company Delignification and bleaching of wood pulp with oxygen
CA1095663A (en) * 1975-02-12 1981-02-17 John Gordy Pulping process
JPS52110902A (en) * 1976-03-12 1977-09-17 Union Carbide Corp Process for increasing pulp yield by treating wood chip with oxygen prior to chemical pulping
US4161421A (en) * 1977-09-13 1979-07-17 Kamyr, Inc. Method and apparatus for continuous oxygen bleaching of cellulosic pulp
US4198266A (en) * 1977-10-12 1980-04-15 Airco, Inc. Oxygen delignification of wood pulp
US4274913A (en) * 1978-05-23 1981-06-23 Toyo Pulp Co., Ltd. Process for producing alkali pulp
US4259150A (en) * 1978-12-18 1981-03-31 Kamyr Inc. Plural stage mixing and thickening oxygen bleaching process
US4363697A (en) * 1979-12-03 1982-12-14 The Black Clawson Company Method for medium consistency oxygen delignification of pulp
SE441192B (sv) * 1980-05-27 1985-09-16 Mo Och Domsjoe Ab Forfarande for delignifiering av kemisk cellulosamassa med syrgas i nervaro av ett eller flera neutralisationsmedel
US4384920A (en) * 1981-04-06 1983-05-24 The Black Clawson Company Method and apparatus for oxygen delignification
US4431480A (en) * 1981-10-27 1984-02-14 The Black Clawson Company Method and apparatus for controlled addition of alkaline chemicals to an oxygen delignification reaction
US4581104A (en) * 1983-08-11 1986-04-08 Ingersoll-Rand Company Method of reducing the lignin in wood pulp with oxygen gas recirculation
US5034095A (en) * 1989-06-01 1991-07-23 Oji Paper Co., Ltd. Apparatus and process for the delignification of cellulose pulp

Also Published As

Publication number Publication date
CA2127654C (en) 1995-11-28
FI943719A0 (fi) 1994-08-11
CA2127654A1 (en) 1995-02-13
EP0641883A2 (en) 1995-03-08
FI943719A (fi) 1995-02-13
AU670201B2 (en) 1996-07-04
EP0641883A3 (en) 1998-05-13
NO942779L (no) 1995-02-13
NO303291B1 (no) 1998-06-22
FI117478B (fi) 2006-10-31
US5591308A (en) 1997-01-07
US5460696A (en) 1995-10-24
AU6880094A (en) 1995-02-23
NO942779D0 (no) 1994-07-26

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