EP1244851B1 - Verfahren zur verbesserung der opazität von mechanischer pulpe durch die anwendung von aliphatischen peroxysäuren und verwendung von peroxysäuren zur verbesserung der opazität - Google Patents

Verfahren zur verbesserung der opazität von mechanischer pulpe durch die anwendung von aliphatischen peroxysäuren und verwendung von peroxysäuren zur verbesserung der opazität Download PDF

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Publication number
EP1244851B1
EP1244851B1 EP00936926A EP00936926A EP1244851B1 EP 1244851 B1 EP1244851 B1 EP 1244851B1 EP 00936926 A EP00936926 A EP 00936926A EP 00936926 A EP00936926 A EP 00936926A EP 1244851 B1 EP1244851 B1 EP 1244851B1
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EP
European Patent Office
Prior art keywords
pulp
opacity
bleaching
acid
improve
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Expired - Lifetime
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EP00936926A
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English (en)
French (fr)
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EP1244851A1 (de
Inventor
Jukka JÄKÄRÄ
Aarto Paren
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Kemira Oyj
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Kemira Chemicals Oy
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    • 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 important 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 dissociated 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 (tetra acetyl ethylene diamine) or some other corresponding activator.
  • TAED tetra acetyl ethylene diamine
  • One disadvantage of TAED is its high price and that it is a solid substance. 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. In addition, when fed into an alkaline bleaching solution (NaOH + H 2 O 2 + waterglass), it would readily cause silicate precipitate and consume the lye.
  • 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).
  • 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.
  • WO-A-97/22749 relates to a process of pre-treatment of lignocellulosic materials with (among others) a mixture of Caro's acid and peracetic acid so as to render the fibers flexible and conformable with low refining energy while improving the strength and brightness of the resulting pulp and subsequently subjecting the fibers to refining.
  • WO-A-97/22749 does not teach how to adjust the opacity of the pulp.
  • 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.
  • 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. The 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 manufacturing 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.
  • Bleached CTMP pulp was treated with peracids, the results are shown in Table 2.
  • Bleached CTMP After-treatment t 50°C, 30 min, pH 7, consistency 5%

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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)

Claims (9)

  1. Verfahren zur Behandlung von Holzstoff, dadurch gekennzeichnet, daß eine aliphatische Percarbonsäure zu der Pulpe in einer Menge von 0,5-5 kg/t Pulpe zugegeben wird, um die Opazität zu beeinflussen.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zugegebene Menge der aliphatischen Percarbonsäure 1-3 kg/t Pulpe beträgt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die aliphatische Percarbonsäure unter Peroxyameisensäure, Peroxyessigsäure oder Peroxypropionsäure ausgewählt ist.
  4. Verfahren nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, daß die aliphatische Percarbonsäure destillierte oder äquilibrierte Peroxyessigsäure ist.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die aliphatische Percarbonsäure zu der Pulpe in Verbindung mit oder nach dem Bleichen gegeben wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Pulpe mit Wasserstoffperoxid und/oder Dithionit gebleicht wurde.
  7. Verfahren nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß die aliphatische Percarbonsäure typischerweise zu einer Pulpe mit einer Konsistenz von 1-40% gegeben wird.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine Mischung von aliphatischer Percarbonsäure und Caroscher Säure zu der Pulpe gegeben wird.
  9. Verwendung von aliphatischer Percarbonsäure, um die Opazität von Holzstoff zu verbessern, wobei die Menge von Percarbonsäure 0,5-5 kg/t Pulpe beträgt.
EP00936926A 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 Expired - Lifetime EP1244851B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI991366 1999-06-15
FI991366A FI107545B (fi) 1999-06-15 1999-06-15 Menetelmä mekaanisten massojen käsittelemiseksi
PCT/FI2000/000532 WO2000077301A1 (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

Publications (2)

Publication Number Publication Date
EP1244851A1 EP1244851A1 (de) 2002-10-02
EP1244851B1 true EP1244851B1 (de) 2003-05-07

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EP00936926A Expired - Lifetime EP1244851B1 (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

Country Status (9)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI111745B (fi) 2001-12-19 2003-09-15 Kemira Chemicals Oy Parannettu kartonginvalmistusmenetelmä
GB2391011A (en) * 2002-07-19 2004-01-28 Crosmill Ltd Bleaching cellulose suspensions
EP2313996B9 (de) 2008-07-30 2019-10-09 Micro Motion, Inc. Verfahren und vorrichtung zur impulsbreitenmodulationssignalverarbeitung
FI127444B (en) * 2015-05-27 2018-06-15 Kemira Oyj A method for reducing the viscosity of a pulp in the manufacture of soluble cellulose
FI127996B (en) * 2016-07-01 2019-07-15 Kemira Oyj Process for treating cellulose
WO2019048698A1 (en) * 2017-09-11 2019-03-14 Kemira Oyj PROCESS FOR TREATING PULP

Family Cites Families (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
US5589032A (en) * 1992-09-21 1996-12-31 North Carolina State University Process for preparing a bleaching liquor containing percarboxylic acid and caro's acid
AU4271596A (en) * 1995-12-19 1997-07-14 Kvaerner Hymac Inc. Process for treating refiner pulp

Also Published As

Publication number Publication date
NO20016083D0 (no) 2001-12-13
WO2000077301A1 (en) 2000-12-21
EP1244851A1 (de) 2002-10-02
AU5224500A (en) 2001-01-02
ES2193085T3 (es) 2003-11-01
FI991366A0 (fi) 1999-06-15
ATE239828T1 (de) 2003-05-15
FI991366A (fi) 2000-12-16
DE60002613T2 (de) 2003-11-27
FI107545B (fi) 2001-08-31
CA2374673A1 (en) 2000-12-21
DE60002613D1 (de) 2003-06-12
NO20016083L (no) 2002-02-14

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