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WO1996041917A1 - Blanchiment aux peroxydes de pate a papier - Google Patents

Blanchiment aux peroxydes de pate a papier Download PDF

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Publication number
WO1996041917A1
WO1996041917A1 PCT/AU1996/000354 AU9600354W WO9641917A1 WO 1996041917 A1 WO1996041917 A1 WO 1996041917A1 AU 9600354 W AU9600354 W AU 9600354W WO 9641917 A1 WO9641917 A1 WO 9641917A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
mgo
added
peroxide
mgo particles
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/AU1996/000354
Other languages
English (en)
Inventor
Adam Hayden Vincent
Ian Alexander Mclean
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
QUEENSLAND METALS Corp Ltd
Orica Australia Pty Ltd
Original Assignee
QUEENSLAND METALS Corp Ltd
ICI Australia Operations Pty Ltd
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 QUEENSLAND METALS Corp Ltd, ICI Australia Operations Pty Ltd filed Critical QUEENSLAND METALS Corp Ltd
Priority to DE69611091T priority Critical patent/DE69611091D1/de
Priority to CA002224677A priority patent/CA2224677C/fr
Priority to EP96917277A priority patent/EP0832323B1/fr
Priority to US08/981,192 priority patent/US6056853A/en
Priority to AU59911/96A priority patent/AU695415B2/en
Priority to AT96917277T priority patent/ATE197825T1/de
Publication of WO1996041917A1 publication Critical patent/WO1996041917A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • Pulps which may be bleached in the process of the invention include lignoceiiulose pulp which may be produced mechanically and chemi-mechanically with yields in the region of greater than 75% which are otherwise known as high yield pulps.
  • BACKGROUND OF THE INVENTION In a conventional peroxide bleaching process, sodium hydroxide is used as an alkali source.
  • auxiliary substances are also used. Such auxiliary substances include sodium silicate, magnesium sulphate and chelating agents inclusive of DTPA (sodium salt of diethylene triamino pentaacetic acid).
  • MgO as sole alkaline source was that only a small amount of waste is produced in the bleaching plant.
  • the used bleaching liquor is combusted and the MgO may be recovered for re-use.
  • MgO as sole alkaline source in a peroxide bleaching process has not as yet achieved widespread commercial acceptance because although the principle of utilising MgO as sole alkaline source was described in the Soteland et al. references, the means of reducing the principle to practice on a commercial scale has not yet been fully elucidated.
  • magnesium oxide as a sole alkaline source in peroxide bleaching of wood pulp may be achieved by employing MgO particles with a particle size of less than 500 micron and more preferably less than 75 micron and having particle surface area (PSA) of between 20- 60 m 2 /g and more preferably between 30-50 m /g.
  • PSA particle surface area
  • MgO Utilizing MgO with parameters outside those stated above will result in a less efficient bleaching process leading to higher usage of chemicals and therefore higher operating costs.
  • the dosages of MgO that may be utilised in the process of the invention is 0.3-2% based on the weight of the pulp.
  • the amount of hydrogen peroxide that may be utilised in the process of the invention is from 1-5% based on the weight of the pulp.
  • the MgO particles must be added to the pulp in the form of a powder or slurry prepared in situ.
  • the MgO is added to the pulp simultaneously with the peroxide or prior to the addition of the peroxide.
  • Chelating agents also may be used in the process of the invention and such chelating agents may comprise DTPA, EDTA or
  • HEDTA hydroxy-ethyiene diamine tetracetic acid
  • the chelating agent is added to the pulp simultaneously with addition of MgO particles, as well as prior to addition of MgO particles.
  • Bleaching times of 60-180 minutes may also be utilised by the process of the invention to achieve a target ISO brightness of 55-65.
  • FIG. 1 is a graph showin the effect of particle size on CCS (Cold Caustic Soda) pulp and more specifically showing particle size vs brightness at different times;
  • FIG. 2 refers to the results of Experiment 2 whereby various samples are plotted aga nst final brightness
  • FIG. 3 also refers to the result of Experiment 2 and shows the effect of surface area on CCS pulp and more specifically showing particle size vs brightness at different times;
  • FIG. 4 shows the results of FIG. 3 when plotted against time.
  • CCS chemi-mechanical pulp, pre-treated with DTPA to remove metal ions, was retrieved from the washers in the bleach plant at the Boyer mill.
  • a mass of 10 g O.D. pulp was placed into a beaker and the approximate mass of chemicals added. The pulp was mixed for 2 minutes in a bench top mixer. The pulp was then wrapped in plastic bags and placed into a constant temperature water bath at 65°C. After two hours retention, the samples were removed from the bath and divided into two. Half the sample was returned to the bath for a further hour of reaction while the other half was made into 5 gram brightness hand sheets. These were dried overnight and then tested for ISO brightness. The work was repeated with samples taken at 2, 3 and 4 hours. Results
  • FIG. 1 A first figure.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Cosmetics (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Dans le procédé décrit de blanchiment aux peroxydes de pâte à papier, on utilise l'oxyde de magnésium comme seule source alcaline. La pâte à papier est blanchie en présence de peroxyde d'hydrogène pendant une durée maximale de 180 minutes et on atteint un degré de blanc selon les normes de l'ISO de 65 par comparaison avec la pâte à papier fraîche. Le procédé se caractérise en ce que l'oxyde de magnésium utilisé se présente sous forme de particules de MgO d'une taille de 5 à 500 microns et d'une superficie de 20 à 60 m<2>/g. Avec ces paramètres, on peut efficacement mettre en oeuvre un procédé de blanchiment aux peroxydes à l'échelle industrielle.
PCT/AU1996/000354 1995-06-13 1996-06-13 Blanchiment aux peroxydes de pate a papier Ceased WO1996041917A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE69611091T DE69611091D1 (de) 1995-06-13 1996-06-13 Peroxidbleichen von zellstoff
CA002224677A CA2224677C (fr) 1995-06-13 1996-06-13 Blanchiment aux peroxydes de pate a papier
EP96917277A EP0832323B1 (fr) 1995-06-13 1996-06-13 Blanchiment aux peroxydes de pate a papier
US08/981,192 US6056853A (en) 1996-06-13 1996-06-13 Process for peroxide bleaching of pulp using MgO particles
AU59911/96A AU695415B2 (en) 1995-06-13 1996-06-13 Peroxide bleaching of pulp
AT96917277T ATE197825T1 (de) 1995-06-13 1996-06-13 Peroxidbleichen von zellstoff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPN3520A AUPN352095A0 (en) 1995-06-13 1995-06-13 Peroxide bleaching of pulp
AUPN3520 1995-06-13

Publications (1)

Publication Number Publication Date
WO1996041917A1 true WO1996041917A1 (fr) 1996-12-27

Family

ID=3787861

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1996/000354 Ceased WO1996041917A1 (fr) 1995-06-13 1996-06-13 Blanchiment aux peroxydes de pate a papier

Country Status (7)

Country Link
EP (1) EP0832323B1 (fr)
KR (1) KR19990022875A (fr)
AT (1) ATE197825T1 (fr)
AU (1) AUPN352095A0 (fr)
CA (1) CA2224677C (fr)
DE (1) DE69611091D1 (fr)
WO (1) WO1996041917A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2164571C1 (ru) * 2000-06-27 2001-03-27 Камский целлюлозно-бумажный комбинат Способ получения беленой сульфитной целлюлозы на магниевом основании
US6743332B2 (en) 2001-05-16 2004-06-01 Weyerhaeuser Company High temperature peroxide bleaching of mechanical pulps
US6881299B2 (en) 2001-05-16 2005-04-19 North American Paper Corporation Refiner bleaching with magnesium oxide and hydrogen peroxide
US7052578B2 (en) * 2000-01-28 2006-05-30 Martin Marietta Magnesia Specialties, Inc. Process employing magnesium hydroxide in peroxide bleaching of mechanical pulp
WO2012037024A2 (fr) 2010-09-16 2012-03-22 Georgia-Pacific Consumer Products Lp Pâtes de haute blancheur obtenues à partir de vieux papiers riches en lignine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951732A (en) * 1972-11-16 1976-04-20 A. Ahlstrom Osakeyhtio Delignification and bleaching of wood pulp with oxygen in the presence of triethanolamine
DE3617942A1 (de) * 1985-06-10 1986-12-11 Papirindustriens Forskningsinstitutt, Oslo Verfahren zur peroxidbleichung von hochertragreichen lignocellulosepulpen
DE4400954A1 (de) * 1994-01-14 1995-08-10 Stefan Kuerzeder Verfahren zur Helligkeitssteigerung bei der Bleiche von Holzstoffen mit Wasserstoffperoxid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951732A (en) * 1972-11-16 1976-04-20 A. Ahlstrom Osakeyhtio Delignification and bleaching of wood pulp with oxygen in the presence of triethanolamine
DE3617942A1 (de) * 1985-06-10 1986-12-11 Papirindustriens Forskningsinstitutt, Oslo Verfahren zur peroxidbleichung von hochertragreichen lignocellulosepulpen
DE4400954A1 (de) * 1994-01-14 1995-08-10 Stefan Kuerzeder Verfahren zur Helligkeitssteigerung bei der Bleiche von Holzstoffen mit Wasserstoffperoxid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY PROCEEDINGS, 1988, N. SOTELAND, "Use of MgO or CaO as the Only Alkaline Source in Peroxide Bleaching of High Yield Pulps", pages 231-236. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7052578B2 (en) * 2000-01-28 2006-05-30 Martin Marietta Magnesia Specialties, Inc. Process employing magnesium hydroxide in peroxide bleaching of mechanical pulp
RU2164571C1 (ru) * 2000-06-27 2001-03-27 Камский целлюлозно-бумажный комбинат Способ получения беленой сульфитной целлюлозы на магниевом основании
US6743332B2 (en) 2001-05-16 2004-06-01 Weyerhaeuser Company High temperature peroxide bleaching of mechanical pulps
US6881299B2 (en) 2001-05-16 2005-04-19 North American Paper Corporation Refiner bleaching with magnesium oxide and hydrogen peroxide
WO2012037024A2 (fr) 2010-09-16 2012-03-22 Georgia-Pacific Consumer Products Lp Pâtes de haute blancheur obtenues à partir de vieux papiers riches en lignine
US8845860B2 (en) 2010-09-16 2014-09-30 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers

Also Published As

Publication number Publication date
AUPN352095A0 (en) 1995-07-06
DE69611091D1 (de) 2001-01-04
EP0832323B1 (fr) 2000-11-29
CA2224677A1 (fr) 1996-12-27
CA2224677C (fr) 2003-12-02
KR19990022875A (ko) 1999-03-25
EP0832323A4 (fr) 1998-09-09
EP0832323A1 (fr) 1998-04-01
ATE197825T1 (de) 2000-12-15

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