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WO2000077301A1 - Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques - Google Patents

Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques Download PDF

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Publication number
WO2000077301A1
WO2000077301A1 PCT/FI2000/000532 FI0000532W WO0077301A1 WO 2000077301 A1 WO2000077301 A1 WO 2000077301A1 FI 0000532 W FI0000532 W FI 0000532W WO 0077301 A1 WO0077301 A1 WO 0077301A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
opacity
bleaching
acid
improve
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/FI2000/000532
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English (en)
Inventor
Jukka JÄKÄRÄ
Aarto Parén
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.)
Kemira Chemicals Oy
Original Assignee
Kemira Chemicals 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 Kemira Chemicals Oy filed Critical Kemira Chemicals Oy
Priority to CA002374673A priority Critical patent/CA2374673A1/fr
Priority to DE60002613T priority patent/DE60002613T2/de
Priority to AU52245/00A priority patent/AU5224500A/en
Priority to EP00936926A priority patent/EP1244851B1/fr
Priority to AT00936926T priority patent/ATE239828T1/de
Publication of WO2000077301A1 publication Critical patent/WO2000077301A1/fr
Priority to NO20016083A priority patent/NO20016083L/no
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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment

Definitions

  • the invention relates to a process for treating mechanical pulps, which can be used to affect the opacity of the pulp.
  • opacity which, along with brightness, is an important property of pulp in paper manufacture. Almost invariably, however, the opacity of the pulp decreases when the brightness increases.
  • mechanical pulps refiner mechanical pulp, groundwood pulp, and chemi- mechanical pulp
  • Dithionite bleaching is also used either alone or together with peroxide bleaching, whereupon dithionite is either used as refiner bleaching or after-bleaching.
  • peroxide bleaching of pulp mechanical pulp in particular, the decrease of opacity is clearly detectable, while the dithionite bleaching does not necessarily decrease the opacity.
  • opacity is an important property. If we want to advance peroxide bleaching at the expense of dithionite bleaching, it would be im- portant to be able to optimize peroxide bleaching so that the opacity remains as high as possible while the brightness grows.
  • the chemicals used in the peroxide bleaching of mechanical pulps are hydrogen peroxide, lye (alkali), and waterglass.
  • the purpose of the base is to increase the pH to a sufficiently high level, so that the hydrogen peroxide is dissoci- ated producing perhydroxyl anions.
  • the purpose of the waterglass is to stabilize the hydrogen peroxide bleaching.
  • peracetic acid can be produced in situ, for example, from acetanhydride or TAED (terra acetyl ethylene di-unine) or some other corresponding activator.
  • TAED terra acetyl ethylene di-unine
  • One disadvantage of TAED is its high price and that it is a solid sub- stance. It would be necessary to disperse the TAED in water before adding it to the pulp, which makes it difficult to use. Furthermore, TAED contains nitrogen, which might constitute a problem for environmental protection. Acetanhydride is relatively cheap, but it would cause odour nuisance and be an inconvenient substance from the point of view of industrial safety.
  • Paper manufacture aims at ever-higher brightness levels.
  • the brightness of paper can be affected, for example, by treating the paper with coating agents containing, among other things, pigments, binding agents, and plasticizing agents (JP application 284598).
  • coating agents containing, among other things, pigments, binding agents, and plasticizing agents (JP application 284598).
  • JP application 284598 the use of several coating agents at the final stage of paper manufacture adds to the manufacturing costs.
  • the agent that affects the opacity of a technically useful pulp should be liquid and stable, and it should preferably have a suitable pH value, so that no silicate precipitate would form in the bleaching. Because of environmental matters, a nitrogen-free substance would provide an additional benefit.
  • the additive of the bleaching should also be cost-effective for the paper manufacturers. Consequently, a substance should be found for pulp bleaching, which, to fulfil the conditions mentioned above, is a reasonable, commercial chemical that is easy to get and can be added to the pulp as early as at the bleaching stage. Furthermore, attention should also be paid to the other effects of the substance, such as applicability in plant conditions.
  • the purpose of this invention is to find a useful substance that is used in pulp bleaching and that affects the opacity, fulfilling the conditions mentioned above.
  • peracetic acid in bleaching chemical pulps is disclosed by the published Japanese application JP 57-21591, for example.
  • peracids as a biocide is also disclosed by publication Kemia, No. 3 (1995), Jyri Maunuksela, Mikrobien torjunta peretikkahapolla (Microbe Prevention with Peracetic Acid), pp. 242-244. Such a method aims at destroying microbe populations in the paper machine only. It is self-evident that peracetic acid, which is known to be an effective biocide, prevents the functioning of microbes in the water circulation, if a sufficient amount is present. The method disclosed by the publication uses a so-called equilibrium peracetic acid that contains a considerable amount of free acetic acid and hydrogen peroxide.
  • acetic acid and hydrogen peroxide that come with the peracid can disturb the paper manufacturing process.
  • Bleaching methods based on peracetic acid have also been presented, aiming at improving the brightness of the pulp compared with normal bleaching methods. Such a method is presented, for example, by publication Pulp and Paper Magazine of Canada, Convention Issue, 1972, pp. 123-131, and by number 3/1968 of the same magazine in pages 51-60.
  • the doses of peracid used by these methods are very high and, consequently, dissolve a considerable amount of lignin from the surfaces of the fibres.
  • these methods aim at increasing the brightness of the pulp, i.e. at bleaching.
  • the invention relates to a method, in which the peracid is either added to the peroxide bleaching or, preferably, after the peroxide bleaching, either to the storage tower of the bleached pulp or, for example, among the machine pulp in the paper machine.
  • the amount of peracid added to the pulp is about 1-3 kg/ton of pulp. Because of its small amount, the peracid does not dissolve the lignin or the like from the pulp, whereupon it does not disturb the paper manufacturing process. It is especially advantageous to use peracid solutions, which have been purified, so that they mainly contain the peracid in question and water only. In that case, the addition of peracid does not have a considerable effect on the pH value of the stock, and no extra COD gets into the process.
  • the invention differs from the known methods based on peracid namely in that it does not aim at increasing the brightness but growing the opacity.
  • a matter worth noticing in particular is that the method differs from the known bleaching treatments also in that the peracid doses used are very small and the method tries to avoid the dissolution of organic matter from the fibres.
  • the method is not actually a bleaching method, and the chemicals used in the actual bleaching of the pulp have no effect whatsoever on the functioning of the invention.
  • the pulp can be bleached with dithionite, peroxide, dithionite and peroxide, or it can even be completely unbleached. Any chelation agents or other additives used in pulp manufacture have no effect on the functioning of the invention either.
  • the consistency of the pulp at the moment the peracid is added can be 1-40%; the temperature can be 20-100°C.
  • the pH of the stock can be 3-11, preferably 4-8. If the peracid is added to alkaline peroxide bleaching, an advantageous pH value is 9-11, however.
  • a suitable reaction time for the peracid is 1- 300 minutes depending on the process.
  • the method is well suited to the treatment of mechanical pulp, such as groundwood pulp (SGW, PGW) and refiner mechanical pulp (TMP), or to treat chemi- mechanical pulps (CTMP).
  • mechanical pulp such as groundwood pulp (SGW, PGW) and refiner mechanical pulp (TMP), or to treat chemi- mechanical pulps (CTMP).
  • SGW, PGW groundwood pulp
  • TMP refiner mechanical pulp
  • CMP chemi- mechanical pulps
  • a suitable dose of peracid has been found to be 0.5-5 kg/ton of pulp, typically 1- 3 kg/ton of pulp.
  • the peracid used can be any peracid that reasonably dissolves in water.
  • peracetic acid and perpropionic acid are preferable peracids, and especially preferable are the peroxide-free distillates that are prepared from the equilibrium solutions of these.
  • the m-mufacturing method of peracid has no effect on the functioning of the invention.
  • Peracid solutions that are either purified by distillation or some other method, or the equilibrium solutions of peracids can be used as peracid.
  • Various mixtures of peracids are also usable.
  • One modification of the invention can use a mixture of peracid and Caro's acid.
  • CTMP pulp was bleached with peroxide in a normal manner. Peracids were added to the bleaching solution, the results are shown in Table 1. Table 1
  • Example 3 So-called machine pulp taken from the plant and containing 16% of softwood pulp, 64% of TMP pulp, and 20% of coated broke (the basic pulp mixture was softwood: TMP 20:80) was treated with peracetic acid. The softwood pulp was normal ECF sulphate pulp. The TMP had been bleached with dithionite. The results are shown in Table 3. Table 3

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

Abstract

L'invention concerne un procédé de traitement de pâte mécanique consistant à lui ajouter de l'acide percarboxylique aliphatique en une quantité comprise entre 0.5 et 5 kg/tonne, de façon à en améliorer l'opacité.
PCT/FI2000/000532 1999-06-15 2000-06-14 Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques Ceased WO2000077301A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002374673A CA2374673A1 (fr) 1999-06-15 2000-06-14 Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques
DE60002613T DE60002613T2 (de) 1999-06-15 2000-06-14 Verfahren zur verbesserung der opazität von mechanischer pulpe durch die anwendung von aliphatischen peroxysäuren und verwendung von peroxysäuren zur verbesserung der opazität
AU52245/00A AU5224500A (en) 1999-06-15 2000-06-14 Method to improve the opacity of mechanical pulp by using aliphatic peroxyacids and use of peroxyacids to improve opacity
EP00936926A EP1244851B1 (fr) 1999-06-15 2000-06-14 Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques
AT00936926T ATE239828T1 (de) 1999-06-15 2000-06-14 Verfahren zur verbesserung der opazität von mechanischer pulpe durch die anwendung von aliphatischen peroxysäuren und verwendung von peroxysäuren zur verbesserung der opazität
NO20016083A NO20016083L (no) 1999-06-15 2001-12-13 Fremgangsmåte for forbedring av opasitet av tremasse ved anvendelse av alifatiske peroksidsyrer og anvendelse avperoksidsyrer for å forbedre opasiteten

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI991366 1999-06-15
FI991366A FI107545B (fi) 1999-06-15 1999-06-15 Menetelmä mekaanisten massojen käsittelemiseksi

Publications (1)

Publication Number Publication Date
WO2000077301A1 true WO2000077301A1 (fr) 2000-12-21

Family

ID=8554886

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000532 Ceased WO2000077301A1 (fr) 1999-06-15 2000-06-14 Procede permettant d'ameliorer l'opacite de pate mecanique au moyen de peroxyacides aliphatiques

Country Status (9)

Country Link
EP (1) EP1244851B1 (fr)
AT (1) ATE239828T1 (fr)
AU (1) AU5224500A (fr)
CA (1) CA2374673A1 (fr)
DE (1) DE60002613T2 (fr)
ES (1) ES2193085T3 (fr)
FI (1) FI107545B (fr)
NO (1) NO20016083L (fr)
WO (1) WO2000077301A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1389646A1 (fr) * 2002-07-19 2004-02-18 Crosmill Ltd Procédé pour la préparation du papier
US7481905B2 (en) 2001-12-19 2009-01-27 Kemira Oyj Process for manufacturing board
US8531326B2 (en) 2008-07-30 2013-09-10 Micro Motion, Inc. Method and apparatus for pulse width modulation signal processing
WO2016189205A1 (fr) * 2015-05-27 2016-12-01 Kemira Oyj Procédé pour réduire la viscosité de la pâte dans la production de pâte pour transformation chimique
WO2018002434A1 (fr) * 2016-07-01 2018-01-04 Kemira Oyj Procédé de traitement de pâte
WO2019048698A1 (fr) * 2017-09-11 2019-03-14 Kemira Oyj Procédé de traitement de pâte

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1119546A (en) * 1965-03-01 1968-07-10 Paper Chemistry Inst Improved method of treating fibrous material
WO1997022749A1 (fr) * 1995-12-19 1997-06-26 Kvaerner Hymac Inc. Procede de traitement de pate de raffineur
US5693185A (en) * 1992-09-21 1997-12-02 North Carolina State University Method of oxidatively treating a substrate with an equilibrium mixture of caro's acid and a percarboxylic acid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1119546A (en) * 1965-03-01 1968-07-10 Paper Chemistry Inst Improved method of treating fibrous material
US5693185A (en) * 1992-09-21 1997-12-02 North Carolina State University Method of oxidatively treating a substrate with an equilibrium mixture of caro's acid and a percarboxylic acid
WO1997022749A1 (fr) * 1995-12-19 1997-06-26 Kvaerner Hymac Inc. Procede de traitement de pate de raffineur

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7481905B2 (en) 2001-12-19 2009-01-27 Kemira Oyj Process for manufacturing board
EP1389646A1 (fr) * 2002-07-19 2004-02-18 Crosmill Ltd Procédé pour la préparation du papier
US8531326B2 (en) 2008-07-30 2013-09-10 Micro Motion, Inc. Method and apparatus for pulse width modulation signal processing
WO2016189205A1 (fr) * 2015-05-27 2016-12-01 Kemira Oyj Procédé pour réduire la viscosité de la pâte dans la production de pâte pour transformation chimique
CN107690496A (zh) * 2015-05-27 2018-02-13 凯米罗总公司 溶解纸浆制造中降低纸浆粘度的方法
US10513824B2 (en) 2015-05-27 2019-12-24 Kemira Oyj Method for reducing pulp viscosity in production of dissolving pulp
CN107690496B (zh) * 2015-05-27 2020-05-19 凯米罗总公司 溶解纸浆制造中降低纸浆粘度的方法
WO2018002434A1 (fr) * 2016-07-01 2018-01-04 Kemira Oyj Procédé de traitement de pâte
CN109415872A (zh) * 2016-07-01 2019-03-01 凯米罗总公司 一种用于处理纸浆的方法
US11072886B2 (en) 2016-07-01 2021-07-27 Kemira Oyj Process for treating pulp
WO2019048698A1 (fr) * 2017-09-11 2019-03-14 Kemira Oyj Procédé de traitement de pâte

Also Published As

Publication number Publication date
FI107545B (fi) 2001-08-31
CA2374673A1 (fr) 2000-12-21
AU5224500A (en) 2001-01-02
NO20016083L (no) 2002-02-14
FI991366L (fi) 2000-12-16
DE60002613D1 (de) 2003-06-12
NO20016083D0 (no) 2001-12-13
DE60002613T2 (de) 2003-11-27
ES2193085T3 (es) 2003-11-01
EP1244851A1 (fr) 2002-10-02
ATE239828T1 (de) 2003-05-15
FI991366A0 (fi) 1999-06-15
EP1244851B1 (fr) 2003-05-07

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