WO1999032710A1 - Blanchiment de pate chimique avec du peracide - Google Patents

Blanchiment de pate chimique avec du peracide Download PDF

Info

Publication number
WO1999032710A1
WO1999032710A1 PCT/FI1998/000993 FI9800993W WO9932710A1 WO 1999032710 A1 WO1999032710 A1 WO 1999032710A1 FI 9800993 W FI9800993 W FI 9800993W WO 9932710 A1 WO9932710 A1 WO 9932710A1
Authority
WO
WIPO (PCT)
Prior art keywords
bleaching
pulp
post
peracid
carried out
Prior art date
Application number
PCT/FI1998/000993
Other languages
English (en)
Inventor
Jukka JÄKÄRÄ
Juha Patola
Aarto Paren
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 EP98961279A priority Critical patent/EP1040222B1/fr
Priority to DE69839097T priority patent/DE69839097T2/de
Priority to JP2000525621A priority patent/JP4499280B2/ja
Priority to BRPI9813747-6A priority patent/BR9813747B1/pt
Priority to AU16743/99A priority patent/AU1674399A/en
Priority to CA002315063A priority patent/CA2315063C/fr
Publication of WO1999032710A1 publication Critical patent/WO1999032710A1/fr

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Classifications

    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/32—Bleaching agents
    • 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

Definitions

  • the present invention relates to a method for the bleaching of chemical pulp, wherein the pulp is treated in a plurality of different steps and a solution containing a peracid is used in at least one of the steps.
  • the invention additionally relates to the use of a peracid-containing bleaching solution in a process step according to the invention.
  • a raw pulp obtained by digesting cellulose-containing materials with suitable digestion chemicals is subjected to a treatment wherein the lignin is removed and a bleaching which involves the use of oxidative chemicals is carried out.
  • the purpose of conventional bleaching of chemical pulp is to bring to completion the removal of lignin from a raw pulp obtained from a digestion procedure.
  • This bleaching can be carried out by using chlorine or chlorine dioxide and thereafter alkaline extraction steps in which the lignin is dissolved out of the pulp.
  • the bleaching of a chemical pulp is increasingly often carried out by bleaching methods using no elementary chlorine or chlorine compounds.
  • the first-mentioned bleaching is called ECF (elementary chlorine free) bleaching and the latter TCF (totally chlorine free) bleaching.
  • ECF elementary chlorine free
  • TCF totally chlorine free
  • the chemical pulp is bleached in several successive steps.
  • the bleaching is often started with an oxygen delignification, whereafter further bleaching can be carried out by various methods.
  • delignification can be continued, for example, by using ozone, peracetic acid or hydrogen peroxide in acid or alkaline conditions.
  • ECF bleaching chlorine dioxide steps and thereafter alkaline extraction steps are used.
  • Peracetic acid can be prepared most simply by mixing vinegar and hydrogen peroxide, whereupon a so-called equilibrium solution is obtained which contains, in addition to peracetic acid, also unreacted initial substances. Also a pure peracetic acid solution can be prepared from this reaction solution by distillation. There are also known other methods for preparing peracetic acid.
  • Peracetic acid is a highly selective bleaching chemical by the use of which good strength properties of the pulp can be maintained. When peracetic acid is used, the optimum pH is approx. 4-7. At a lower pH peracetic acid is a highly selective delignifying chemical. At a higher pH its bleaching action is greater but its selectivity decreases.
  • Agents suitable for post-bleaching include peracetic acid and dithionite.
  • the use of hydrogen peroxide is limited by the fact that in order to function properly it would require alkaline conditions.
  • dithionite and peracetic acid are highly suited for post-bleaching.
  • Dithionite is used commonly in the bleaching of mechanical pulps, but normally it is not used in the bleaching of chemical pulp. The sulfur present in it may also cause problems.
  • Post-bleaching with peracetic acid is a very effective method of increasing brightness. The consumption of chemicals for bleached pulps is low, and in addition the reaction is rapid even at low consistency. Furthermore, the optimum pH range for bleaching is precisely suitable for post-bleaching.
  • the peracetic acid post-bleaching of chemical pulps involves the problem that, within the pH range optimal for the bleaching result, selectivity is no longer at its best.
  • selectivity is no longer at its best.
  • the use of peracetic acid damages the fibers, causing the breaking down of carbohydrates and the lowering of pulp strength. This also causes dissolving of organic matter out of the pulp, a factor which may disturb the running of the paper machine.
  • the bleaching method according to the invention which solves the problems mentioned above, is characterized in that a peracid is used in the post-bleaching which is the last step of the bleaching process and takes place in the presence of one or more earth-alkali metal compounds.
  • An post-bleaching such as this can advantageously be carried out as a separate step at the paper mill to which the pulp has been transferred from a bleach plant.
  • the earth-alkali metals such as magnesium and calcium, used simultaneously with a peracid in the method according to the invention stabilize carbohydrates so that the reducing of the pulp strength is prevented. In other words, the strength of the pulp remains good and the dissolving of organic matter is in- significant.
  • the brightness and whiteness of the pulp are also higher than without the use of earth-alkali metals. This decreases, for example, the need for using optical brighteners in the paper machine. When this method is used, the pH of the stock to be turned into paper, and the brightness and whiteness of the pulp are more even, in which case the runnability of the paper machine is considerably improved.
  • magnesium protects the viscosity of the pulp.
  • delignification which is carried out on a pulp having a high kappa number. This delignification step is followed by a separate bleaching during which the brightness is raised to its final level.
  • transition metals such as Fe and Mn are released from the pulp, and magnesium prevents their detrimental effects.
  • the addition of magnesium is used for improving the ratio of magnesium to transition metal, which improves especially the running of the subsequent alkaline peroxide step.
  • the invention concerns post- bleaching which is carried out on an already delignified pulp having a low kappa number (preferably below 4) and being free of transition metals, the purpose being to raise the brightness and whiteness of the pulp to the desired level.
  • the peracetic acid turns colorless the chromophoric groups in the pulp, mainly in carbohydrates.
  • the question is of the reactions of peracetic acid with residual lignin in the pulp.
  • the peracetic acid dose is considerably smaller.
  • a very small peracetic acid dose 0.1-7 kg/tp, preferably 0.5-3 kg/tp, is sufficient, larger doses being even detrimental.
  • the peracid used in the method is preferably peracetic acid.
  • Other usable peracids include performic acid, perpropionic acid or some longer-chain percarboxylic acid.
  • the peracid may be a so- called equilibrium solution, i.e. a reaction mixture containing the said acid, a peracid and hydrogen peroxide, or a pure peracid solution can be used.
  • the method by which the peracid solution is prepared does not restrict the use of the method; the peracid may be prepared, for example, by distilling an equilibrium solution or from an anhydride and hydrogen peroxide.
  • the peracid may also be a monopersulfuric acid (Caro's acid) or a mixture of Caro's acid and a percarboxylic acid, e.g. peracetic acid.
  • Persulfates may also be used, either as such or as a mixture with any of the above-mentioned peracids.
  • the earth-alkali metal used in the post-bleaching according to the invention may be in particular calcium or magnesium. These may be added to the bleaching solution in the form of sulfate. acetate, carbonate, oxide or any other compound. It is possible to use in the method either magnesium or calcium alone or both of them together at any ratio. Calcium has over magnesium the advantage that calcium will not precipitate extract-based and resin-based substances which may be present at the wet end of the paper machine.
  • the post-bleaching according to the invention may be preceded by any known bleaching reaction known from bleaching sequences.
  • the post-bleaching is especially advantageous for use after chlorine dioxide or peroxide bleaching.
  • acidification possibly taking place after the bleaching does not restrict the application of the method; it can be used on both non-acidified and acidified stock.
  • the said acidification may be carried out with, for example, S0 2 , sulfuric acid or any acid suitable for this purpose.
  • the functioning of the invention is not affected by a possible wash of the pulp before or after the post-bleaching, or by the absence of a wash.
  • the consistency of the pulp to be after-bleached may be 1-30 % and the temperature during the post- bleaching may be between 30 and 100 °C.
  • the after-bleached pulp may be taken directly to the paper machine or be dried to produce baled pulp.
  • the method is suited for use on sulfate and sulfite pulps made both from softwood and from hardwood, and on various organosolv pulps.
  • the said prior art methods in which a peracid and magnesium are used or in which a peracid has been present in the last steps of the bleaching sequence are characterized in that they are carried out in the normal manner in the bleach plant of the pulp mill.
  • the post-bleaching according to the invention in which the bleaching reaction is very rapid even at a low consistency, is not tied to the bleach plant and thus also does not require investment in equipment for the bleach plant.
  • the invention primarily concerns an post-bleaching carried out after the bleaching sequence of the bleach plant, outside the actual bleaching, for example in the pulp flow pipe during the transfer of pulp, during pulp storage or in the paper machine. Instead of the bleach plant, the place at which the post-bleaching according to the invention is carried out is typically a storage tower for bleached pulp or the paper mill.
  • the earth-alkali metal compounds used can be added to the bleaching solution in any suitable process step. They can be added to the circulating waters before the water arrives in the post-bleaching step, or they may, for example, come in the dilution waters from the paper machine, where they may be added in any form. It is also possible to use chelators simultaneously with earth-alkali metals.
  • the invention comprises the use of a solution which contains a peracid and an earth-alkali metal for post-bleaching of delignified pulp at a paper mill.
  • a birch sulfate pulp which had been bleached using a sequence consisting of an oxygen step, chelation, an oxygen + peroxide step, a chlorine dioxide step, a peroxide extraction, a chlorine dioxide step (-O-Q-Op-D-Ep-D) was subjected separately to an post-bleaching at 50 °C with a 30 min retention at a consistency of 5 % with a peracetic acid dose of 3 kg/tp at two different pH levels (approx. 6.5 and approx. 4.5) .
  • the peracetic acid used had been distilled.
  • Calcium was added to the pulp in the form of acetate, and magnesium in the form of sulfate.
  • the figures in the table indicate the dose of the chemical concerned per one metric ton of pulp (kg of 100 % chemical/one metric ton of pulp) .
  • Experiment number 0 stands for pulp which has not been after- bleached.
  • a birch sulfate pulp which had been bleached by the sequence -O-Q-Op-D-Ep-D according to Example 1 was subjected to an post- bleaching at 50 °C with a 30 min retention at a consistency of 5 % with a peracetic acid dose of 3 kg/tp at different pH levels.
  • the magnesium sulfite addition was 1 kg/tp.
  • the peracetic acid used had been distilled.
  • the brightness of the pulp before the post-bleaching was 90,3 % ISO and viscosity 930 dm 3 /kg.
  • a TCF-bleached softwood sulfate pulp which had been bleached using oxygen, ozone and hydrogen peroxide was after-bleached at 70 °C with a 240 min retention at a consistency of 10 % by using two different peracetic acid doses.
  • the conditions and results of the post-bleaching are shown in Table 3.
  • the brightness of the pulp before the post-bleaching was 86.8 % ISO and viscosity 642 dmVkg, and the kappa number was 1.7.
  • a TCF-bleached softwood sulfate pulp which had been bleached using oxygen, ozone and hydrogen peroxide was after-bleached at 70 °C with a 240 min retention at a viscosity of 10 % by using two different peracetic acid doses.
  • the conditions and results of the post-bleaching are shown in Table 4.
  • the brightness of the pulp before the post-bleaching was 87.6 % ISO and viscosity 623 dmVkg, and the kappa number was 1.8.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Cosmetics (AREA)

Abstract

L'invention concerne un procédé de blanchiment de pâte chimique et l'utilisation d'une solution de blanchiment. Selon cette invention, plusieurs opérations différentes permettent de traiter la pâte, l'une de ces opérations au moins utilisant une solution de blanchiment contenant un peracide. Le principe de base de cette invention réside dans l'utilisation du peracide dans le post-blanchiment, dernière opération du processus de blanchiment. Le post-blanchiment est réalisé en la présence d'un ou de plusieurs composés de métal alcalino-terreux. L'utilisation d'un peracide permet de donner à la pâte sa blancheur finale, l'ajout du métal alcalino-terreux servant à combattre la diminution de la viscosité de la pâte. Selon l'invention, le post-blanchiment peut être réalisé après les opérations de blanchiment dans un tuyau d'écoulement de pâte, dans une tour de stockage ou dans une machine à papier d'une papeterie.
PCT/FI1998/000993 1997-12-19 1998-12-18 Blanchiment de pate chimique avec du peracide WO1999032710A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP98961279A EP1040222B1 (fr) 1997-12-19 1998-12-18 Blanchiment de pate chimique avec du peracide
DE69839097T DE69839097T2 (de) 1997-12-19 1998-12-18 Bleichen von zellstoff mittels persäure
JP2000525621A JP4499280B2 (ja) 1997-12-19 1998-12-18 過酸による化学パルプの漂白
BRPI9813747-6A BR9813747B1 (pt) 1997-12-19 1998-12-18 alvejamento de polpa quÍmica com perÁcido.
AU16743/99A AU1674399A (en) 1997-12-19 1998-12-18 Bleaching of chemical pulp with peracid
CA002315063A CA2315063C (fr) 1997-12-19 1998-12-18 Blanchiment de pate chimique avec du peracide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI974575 1997-12-19
FI974575A FI112958B (fi) 1997-12-19 1997-12-19 Menetelmä kemiallisen massan valkaisemiseksi sekä valkaisuliuoksen käyttö

Publications (1)

Publication Number Publication Date
WO1999032710A1 true WO1999032710A1 (fr) 1999-07-01

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ID=8550176

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1998/000993 WO1999032710A1 (fr) 1997-12-19 1998-12-18 Blanchiment de pate chimique avec du peracide

Country Status (11)

Country Link
EP (1) EP1040222B1 (fr)
JP (1) JP4499280B2 (fr)
AT (1) ATE385526T1 (fr)
AU (1) AU1674399A (fr)
BR (1) BR9813747B1 (fr)
CA (1) CA2315063C (fr)
DE (1) DE69839097T2 (fr)
ES (1) ES2302362T3 (fr)
FI (1) FI112958B (fr)
PT (1) PT1040222E (fr)
WO (1) WO1999032710A1 (fr)

Cited By (35)

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WO2000052258A1 (fr) * 1999-03-02 2000-09-08 Kemira Chemicals Oy Blanchiment de pate utilisant un peracide dans l'etape finale
JP2001316997A (ja) * 2000-02-28 2001-11-16 Oji Paper Co Ltd 中性紙
US6677477B2 (en) 2001-04-04 2004-01-13 Kemira Chemicals Oy Process for the production of peracetic acid
EP1389646A1 (fr) * 2002-07-19 2004-02-18 Crosmill Ltd Procédé pour la préparation du papier
WO2006089274A1 (fr) * 2005-02-19 2006-08-24 International Paper Company Fixation d'agents de blanchiment optique sur une fibre destinee a la fabrication de papier
US7371356B2 (en) 2002-03-14 2008-05-13 Basf Aktiengesellschaft Method for the production of precipitated calcium carbonate with a high degree of brightness
US7481905B2 (en) 2001-12-19 2009-01-27 Kemira Oyj Process for manufacturing board
US7638016B2 (en) 2005-02-19 2009-12-29 International Paper Company Method for treating kraft pulp with optical brighteners after chlorine bleaching to increase brightness
US7910347B1 (en) 2009-12-07 2011-03-22 E. I. Du Pont De Nemours And Company Perhydrolase providing improved peracid stability
US7914646B2 (en) 2006-07-21 2011-03-29 Nalco Company Compositions and processes for paper production
US7923233B1 (en) 2009-12-07 2011-04-12 E. I. Du Pont De Nemours And Company Perhydrolase providing improved peracid stability
US7927854B1 (en) 2009-12-07 2011-04-19 E. I. Du Pont De Nemours And Company Perhydrolase providing improved peracid stability
US7932072B1 (en) 2009-12-07 2011-04-26 E. I. Du Pont De Nemours And Company Perhydrolase providing improved peracid stability
US7960528B1 (en) 2009-12-07 2011-06-14 E. I. Du Pont De Nemours And Company Perhydrolase providing improved peracid stability
US8268123B2 (en) 2006-05-17 2012-09-18 Mitsubishi Gas Chemical Company, Inc. Process for producing bleached pulp
US8389258B2 (en) 2010-12-21 2013-03-05 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8389259B2 (en) 2010-12-21 2013-03-05 E.I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8389256B2 (en) 2010-12-21 2013-03-05 E.I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
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US8389260B2 (en) 2010-12-21 2013-03-05 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8394616B2 (en) 2010-12-21 2013-03-12 E.I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8394617B2 (en) 2010-12-21 2013-03-12 E.I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8399234B2 (en) 2010-12-21 2013-03-19 E.I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
FR2997069A1 (fr) * 2012-10-18 2014-04-25 Nicolas Saverino Procede de fabrication d'une barquette coloree
WO2018002434A1 (fr) * 2016-07-01 2018-01-04 Kemira Oyj Procédé de traitement de pâte
WO2018106285A1 (fr) * 2015-12-07 2018-06-14 Clean Chemistry, Inc. Procédés de traitement de fibres de pâte à papier
US10259729B2 (en) 2014-09-04 2019-04-16 Clean Chemistry, Inc. Systems and method of water treatment utilizing reactive oxygen species and applications thereof
US10472265B2 (en) 2015-03-26 2019-11-12 Clean Chemistry, Inc. Systems and methods of reducing a bacteria population in high hydrogen sulfide water
US10501346B2 (en) 2012-09-07 2019-12-10 Clean Chemistry, Inc. System and method for generation of point of use reactive oxygen species
US10513824B2 (en) * 2015-05-27 2019-12-24 Kemira Oyj Method for reducing pulp viscosity in production of dissolving pulp
US10577698B2 (en) 2011-05-31 2020-03-03 Clean Chemistry, Inc. Electrochemical reactor and process
US10883224B2 (en) 2015-12-07 2021-01-05 Clean Chemistry, Inc. Methods of pulp fiber treatment
US11001864B1 (en) 2017-09-07 2021-05-11 Clean Chemistry, Inc. Bacterial control in fermentation systems
US11136714B2 (en) 2016-07-25 2021-10-05 Clean Chemistry, Inc. Methods of optical brightening agent removal
US11311012B1 (en) 2017-09-07 2022-04-26 Clean Chemistry, Inc. Bacterial control in fermentation systems

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JP4956991B2 (ja) * 2005-12-22 2012-06-20 三菱瓦斯化学株式会社 化学パルプの製造方法
CA2709526C (fr) 2007-12-20 2016-02-02 Mitsubishi Gas Chemical Company Inc. Procede pour la production de pate blanchie
US8450091B2 (en) 2010-03-26 2013-05-28 E. I. Du Pont De Nemours And Company Perhydrolase providing improved specific activity
WO2011119706A1 (fr) 2010-03-26 2011-09-29 E.I. Dupont De Nemours And Company Perhydrolase permettant d'obtenir une activité spécifique améliorée
WO2011119708A1 (fr) 2010-03-26 2011-09-29 E.I. Dupont De Nemours And Company Perhydrolase permettant d'obtenir une activité spécifique améliorée
US8206964B2 (en) 2010-03-26 2012-06-26 E. I. Du Pont De Nemours And Company Perhydrolase providing improved specific activity
US8586339B2 (en) 2010-03-26 2013-11-19 E. I. Du Pont De Nemours And Company Facilitated process for purification of proteins
US8389255B2 (en) 2010-03-26 2013-03-05 E.I. De Pont De Nemours And Company Perhydrolase providing improved specific activity
WO2012087966A2 (fr) 2010-12-20 2012-06-28 E. I. Du Pont De Nemours And Company Perhydrolases ciblées
US8546119B2 (en) 2011-10-25 2013-10-01 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8557556B2 (en) 2011-10-25 2013-10-15 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8546120B2 (en) 2011-10-25 2013-10-01 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8809030B2 (en) 2011-10-25 2014-08-19 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8735125B2 (en) 2011-10-25 2014-05-27 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8956843B2 (en) 2011-10-25 2015-02-17 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
WO2013062885A1 (fr) 2011-10-25 2013-05-02 E.I. Dupont De Nemours And Company Variant de perhydrolase permettant une activité spécifique améliorée
US8486679B2 (en) 2011-10-25 2013-07-16 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
US8962294B2 (en) 2011-10-25 2015-02-24 E. I. Du Pont De Nemours And Company Perhydrolase variant providing improved specific activity
WO2013096045A1 (fr) 2011-12-19 2013-06-27 E. I. Du Pont De Nemours And Company Variants de perhydrolase présentant une activité spécifique améliorée en présence de tensioactif
CN104350154B (zh) 2012-03-30 2020-12-29 纳幕尔杜邦公司 对于过酸的生产有用的酶
BR112014024207B1 (pt) 2012-03-30 2022-04-05 E.I. Du Pont De Nemours And Company Processo para a produção de um ácido peroxicarboxílico, composição e sistema de geração e fornecimento de perácido
CA2867998C (fr) 2012-03-30 2021-05-04 E. I. Du Pont De Nemours And Company Enzymes utiles pour la production de peracide
EP2831252B1 (fr) 2012-03-30 2021-11-24 DuPont US Holding, LLC Enzymes utiles pour la production de peracide
CA2867939C (fr) 2012-03-30 2022-01-04 E. I. Du Pont De Nemours And Company Enzymes utiles pour la production de peracide
WO2017055504A1 (fr) * 2015-09-30 2017-04-06 Imerys Minerals Limited Procédés de blanchiment de pâtes aqueuses, et compositions destinées à être utilisées dans ces procédés

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CA2315063A1 (fr) 1999-07-01
BR9813747A (pt) 2000-10-17
EP1040222B1 (fr) 2008-02-06
FI112958B (fi) 2004-02-13
DE69839097D1 (de) 2008-03-20
AU1674399A (en) 1999-07-12
FI974575A0 (fi) 1997-12-19
CA2315063C (fr) 2008-11-18
ES2302362T3 (es) 2008-07-01
FI974575A (fi) 1999-06-20
EP1040222A1 (fr) 2000-10-04
DE69839097T2 (de) 2009-01-29
ATE385526T1 (de) 2008-02-15
JP2001527168A (ja) 2001-12-25

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