EP0141355A1 - Process for bleaching ground wood pulp - Google Patents

Process for bleaching ground wood pulp Download PDF

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Publication number
EP0141355A1
EP0141355A1 EP84112648A EP84112648A EP0141355A1 EP 0141355 A1 EP0141355 A1 EP 0141355A1 EP 84112648 A EP84112648 A EP 84112648A EP 84112648 A EP84112648 A EP 84112648A EP 0141355 A1 EP0141355 A1 EP 0141355A1
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Prior art keywords
acid
salts
acids
bleaching
amino
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EP84112648A
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German (de)
French (fr)
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EP0141355B1 (en
Inventor
Harald Dr. Beurich
Margarete Scholl
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BK Ladenburg GmbH
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Benckiser Knapsack GmbH
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Priority to AT84112648T priority Critical patent/ATE34790T1/en
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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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/39—Organic or inorganic per-compounds
    • C11D3/3902—Organic or inorganic per-compounds combined with specific additives
    • C11D3/3937—Stabilising agents
    • C11D3/394—Organic compounds

Definitions

  • the present invention relates to auxiliaries.
  • the present invention relates to auxiliaries for stabilizing bleaching solutions used for wood pulp bleaching, in particular when using bleaching solutions containing peroxide and / or sulfite.
  • the bleaching of the wood pulp necessary for use as a raw material in paper production is generally carried out with the aid of hydrogen peroxide and / or dithionite or hydrosulfite.
  • the bleaching can be carried out in one or two stages.
  • the bleaching result is influenced by the type of wood and wood pretreatment, the amount of bleach, the water quality, the Dosage and the type of additives.
  • the average increase in white for one-step bleaching is 8-10 points, for two-step bleaching 16-19 points.
  • the aim of the present invention was therefore to develop products which allow complete replacement of the water glass in the peroxide bleaching of wood pulp and which also have a bleaching support in the case of the dithionite bleaching.
  • Gluconic acid citric acid, N, N-dihydroxyethylenegycin, diethylenetriaminepentaacetic acid, ethylenediaminetetraacetic acid, nitrilotrisacetic acid or the corresponding salts of these acids.
  • the corresponding alkali and alkaline earth metal salts of orthophoric acid b and polyphosphoric acids can be used as the phosphate component.
  • a bleaching formulation can have the following composition:
  • Example 2 as example 1, but 4% water glass was replaced by 1% of the specified compound.
  • Example 3 as example 1, but instead of 4% water glass 1% of combinations of the compounds mentioned in example 2
  • Example 4 Experimental procedure as in Example 1, but with a combination of three substance groups.
  • the test was carried out at a consistency of 5% under inert gas.
  • the pH was 6, the equilibrium temperature was 60 ° C., the residence time was 1 hour.
  • the bleaching aid was metered in at 1%, as was the Na 2 S 2 O 4 .

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)

Abstract

1. Process for the bleaching of mechanical wood pulp in peroxide solutions, characterized in that one carries out the bleaching procedure without silicates in the presence of 1.phosphonic acids or their salts, 2. gluconic acid, citric acid, N,N-dihydroxyethyleneglycine, DTPA, EDTA, NTA or their mixtures or salts and 3. phosphoric acid or its salts.

Description

vorliegenden Erfindung sind Hilfsmittel Gegenstand der vorliegenden Erfindung sind Hilfsmittel zur Stabilisierung von zur Holzschliffbleiche eingesetzten Bleichlösungen, insbesondere bei Verwendung von peroxid-und/oder sulfithaltigen Bleichlösungen.The present invention relates to auxiliaries. The present invention relates to auxiliaries for stabilizing bleaching solutions used for wood pulp bleaching, in particular when using bleaching solutions containing peroxide and / or sulfite.

Das für den Einsatz als Rohstoff bei der Papierherstellung notwendige Bleichen des Holzschliffes erfolgt im allgemeinen mit Hilfe von Wasserstoffperoxid und/oder Dithionit bzw. Hydrosulfit. Die Bleiche kann hierbei sowohl ein- als auch zweistufig durchgeführt werden.The bleaching of the wood pulp necessary for use as a raw material in paper production is generally carried out with the aid of hydrogen peroxide and / or dithionite or hydrosulfite. The bleaching can be carried out in one or two stages.

Das Bleichergebnis wird beeinflußt von Holzart und Holzvorbehandlung, der Bleichmittelmenge, der Wasserqualität, der Dosierweise und der Art der Zusatzmittel. Die durchschnittliche WeiBesteigerung bei einer Einstufenbleiche beträgt 8 - 10 Punkte, bei einer Zweistufenbleiche 16 - 19 Punkte.The bleaching result is influenced by the type of wood and wood pretreatment, the amount of bleach, the water quality, the Dosage and the type of additives. The average increase in white for one-step bleaching is 8-10 points, for two-step bleaching 16-19 points.

Stand der Technik ist, daB die zur Erzielung der gewünschten WeiBesteigerung notwendige Stabilisierung der Bleichlösung im Falle von Wasserstoffperoxid mit Hilfe von Wasserglas vorgenommen wird. Der Einsatz von Wasserglas führt jedoch zu verfahrenstechnischen Problemen, da hierdurch Ablagerungen in den Maschinenteilen und Schwierigkeiten bei der Abwasserklärung hervorgerufen werden. Diese Probleme erfordern zu ihrer Minderung einen erhöhten Einsatz an chemischen Hilfsmitteln, was durch die ebenfalls dem Stand der Technik entspxeahende KreislaufschlieBung wieder zu neuen Problemen führt. Weiterhin ist die Dosierung von Wasserglas problematisch, was widerum teilweise seine Ursache in der Qualität des verwendeten Wassers hat.State of the art is that the stabilization of the bleaching solution necessary to achieve the desired increase in whiteness in the case of hydrogen peroxide is carried out with the aid of water glass. However, the use of water glass leads to procedural problems, since this causes deposits in the machine parts and difficulties in the waste water treatment. These problems require an increased use of chemical auxiliaries to reduce them, which again leads to new problems due to the closing of the circuit which also corresponds to the state of the art. Furthermore, the dosage of water glass is problematic, which in turn is partly due to the quality of the water used.

Es ist bis jetzt nicht gelungen; Produkte zur Verfügung zustellen, die einen vollständigen Ersatz von Wasserglas bei der Holzschliffbleiche mit Peroxid erlauben. Ziel der vorliegenden Erfindung war es daher, Produkte zu entwickeln, die einen vollständigen Ersatz des Wasserglases bei der Peroxidbleiche von Holzschliff erlauben und die darüberhinaus auch bei der Dithionitbleiche bleichunterstützend wirken.So far it has not succeeded; To provide products that allow a complete replacement of water glass in wood pulp bleaching with peroxide. The aim of the present invention was therefore to develop products which allow complete replacement of the water glass in the peroxide bleaching of wood pulp and which also have a bleaching support in the case of the dithionite bleaching.

Es war naheliegend, für den genannten Einsatzzweck die als Peroxidstabilisatoren bekannten Produkte einzusetzen. Völlig unerwartet zeigte sich jedoch, daB diese Produkte trotz ihrer ausgezeichneten Stabilisierwirkung gegenüber Peroxid nur unzureichende Bleicheffekte ergaben.It was obvious to use the products known as peroxide stabilizers for the purpose mentioned. However, it was shown completely unexpectedly that, despite their excellent stabilizing effect against peroxide, these products gave only insufficient bleaching effects.

überraschenderweise gelang die Lösung der gestellten Aufgabe durch Verwendung einer Kombination von Phosphonsäuren, Polyhydroxycarbonsäuren und Phosphaten.Surprisingly, the problem was solved by using a combination of phosphonic acids, polyhydroxycarboxylic acids and phosphates.

Diese Substanzen üben für sich ungenügende Bleichwirkung aus, bzw. sie zeigen eine nur geringe Stabilisierung der Peroxidlösung. Zum Teil wirken sie sogar destabilisierend.These substances exert inadequate bleaching action or show only a slight stabilization of the peroxide solution. In some cases, they even have a destabilizing effect.

Als Phosphonsäuren können verwendet werden:

  • N,N-Bis(carboxy-methyl).-1-amino-ethan-1,1-diphosphonsäure;
  • N-2-carboxyethyl-1-amino-ethan-1,1--diphosphonsäuxef;
  • N,N-Bis(hydroxy-methyl)-1-amino-ethan-1,1-diphosphonsäure;
  • 1,2,1-tricarboxybutan-2-phosphonsäure;
  • Diethylentriaminpentamethylenphosphonsäure (DTPMP);
  • Hydroxyethandisphosphonsäüre (HEDP);
  • Aminotrismethylenphösphonsäure (ATMP)
  • bzw. die entsprechenden Salze dieser Säuren.
The following can be used as phosphonic acids:
  • N, N-bis (carboxymethyl). 1-aminoethane-1,1-diphosphonic acid;
  • N-2-carboxyethyl-1-amino-ethane-1,1-diphosphonic acid;
  • N, N-bis (hydroxy-methyl) -1-amino-ethane-1,1-diphosphonic acid;
  • 1,2,1-tricarboxybutane-2-phosphonic acid;
  • Diethylenetriaminepentamethylenephosphonic acid (DTPMP);
  • Hydroxyethane disphosphonic acid (HEDP);
  • Aminotrismethylenephosphonic acid (ATMP)
  • or the corresponding salts of these acids.

Als Polyhydroxycarbonsäuren können verwendet werden:The following can be used as polyhydroxycarboxylic acids:

Gluconsäure, Citronensäure, N,N-Dihydroxyethylengycin, Diethylentriaminpentaessigsäure, Ethylendiamintetraessigsäure, Nitrilotrisessigsäure bzw. die entsprechenden Salze dieser Säuren. Als Phosphatkomnonente können die entsprechenden Alkali- und Erdalkalisalze der Orthophorsäure bzw. der Polyphosphorsäuren eingesetzt werden.Gluconic acid, citric acid, N, N-dihydroxyethylenegycin, diethylenetriaminepentaacetic acid, ethylenediaminetetraacetic acid, nitrilotrisacetic acid or the corresponding salts of these acids. The corresponding alkali and alkaline earth metal salts of orthophoric acid b and polyphosphoric acids can be used as the phosphate component.

Als besonders geeignet haben sich die genannten Komponenten in Mischungsverhältnissen von 80/10/10, 10/80/80 erwiesen.The components mentioned in mixing ratios of 80/10/10, 10/80/80 have proven to be particularly suitable.

Durch die gemeinsame Verwendung dieser Substanzen entsteht ein synergistischer Effekt, der insbesondere deshalb überrascht, da cinzelne Komponenten oder diese in Zweierkombination nur ungenügende Bleichwirkung ausüben, bzw. destabilisierend auf das Oxidationsmittel wirken. Die nachfolgenden Beispiele erläutern die erfindungsgemäßen Zusammenhänge näher.The combined use of these substances creates a synergistic effect, which is particularly surprising because individual components or these in combination of two only have an insufficient bleaching effect or have a destabilizing effect on the oxidizing agent. The following examples explain the relationships according to the invention in more detail.

Beispiele:Examples:

Eine Bleichrezeptur kann nach dem heutigen Stand der Technik folgende Zusammensetzung haben:

Figure imgb0001
According to the current state of the art, a bleaching formulation can have the following composition:
Figure imgb0001

Bei den Versuchen wurde wie folgt verfahren:The test was carried out as follows:

20 g Holzschliff otro wurden mit 20 ml Bleichlösung 3 h bei 60°C gebleicht. Danach wurde mit Schwefelsäure auf pH 5 abgesäuert, auf einer Blattbildungsanlage Prüfblätter hergestellt und der Weißgrad nach TAPPI gemessen. Die Bleichlösung bestand aus 1,9 % H2O2, 1,7 % NaOH und dem jeweiligen Stabilisator. Der pH-Wert der Bleichlösung betrug 11,0. Die Stabilität der Bleichltisung wurde mittels Permanganattitration überprüft. Die Stoffdichte lag bei 20 %.20 g wood pulp otro were bleached with 20 ml bleaching solution at 60 ° C for 3 h. The mixture was then acidified to pH 5 with sulfuric acid, test sheets were prepared on a sheet formation system and the degree of whiteness was measured in accordance with TAPPI. The Bleaching solution consisted of 1.9% H 2 O 2 , 1.7% NaOH and the respective stabilizer. The pH of the bleaching solution was 11.0. The stability of the bleaching solution was checked by means of permanganate titration. The consistency was 20%.

Beispeil 1:Example 1:

Figure imgb0002
Figure imgb0002

Beispiel 2: wie Beispiel 1, jedoch wurde 4 % Wasserglas durch 1 % der angegebenen Verbindung ersetzt.Example 2: as example 1, but 4% water glass was replaced by 1% of the specified compound.

Figure imgb0003
Figure imgb0003
Figure imgb0004
Figure imgb0004

Beispiel 3: wie Beispiel 1, jedoch statt 4 % Wasserglas 1 % an Kombinationen der in Beispiel 2 genannten VerbindungenExample 3: as example 1, but instead of 4% water glass 1% of combinations of the compounds mentioned in example 2

Figure imgb0005
Figure imgb0005

Beispiel 4: Versuchsdurchführung wie in Beispiel 1, jedoch mit einer Kombination aus drei Substanzgruppen.Example 4: Experimental procedure as in Example 1, but with a combination of three substance groups.

Figure imgb0006
Figure imgb0006
Figure imgb0007
Figure imgb0007

Beispiel 5: DithionitbleicheExample 5: Dithionite bleach

Die Versuchsdurchführung erfolgte bei einer Stoffdichte von 5 % unter Inertgas. Der pH-Wert lag bei 6, die Gleichtemperatur betrug 60°C, die Verweilzeit 1 h. Das Bleichhilfsmittel wurde mit 1 % dosiert, ebenfalls das Na2S2O4.

Figure imgb0008
The test was carried out at a consistency of 5% under inert gas. The pH was 6, the equilibrium temperature was 60 ° C., the residence time was 1 hour. The bleaching aid was metered in at 1%, as was the Na 2 S 2 O 4 .
Figure imgb0008

Die voranstehenden Beispiele zeigen eindeutig, daß mit den erfindurigsgemäßen Bleichhilfsmitteln wesentlich bessere. Stabilisierwirkungen und Weißgradgewinne als mit den jeweiligen Einzelkomponenten erzielt werden. Darüberhinaus kann Wasserglas vollständig ersetzt werden, wobei z.T. sogar eine höhere Weiße erzielt wird. Desweiteren konnte bei diesen Versuchen gezeigt werden, daß sowohl bei Verwendung von Wasserglas als auch bei alleinigem Einsatz der Einzelkomponenten eine wesentlich höhere Menge als beim Einsatz der erfindungsgemäßen Kombination eingesetzt werden muß. Somit wird bei Einsatz der erfindungsgemäßen Produkte die Belastung des Kreislauf- wassers mit Chemikalien herabgesetzt. Dies führt zusammen mit den oben beschriebenen Vorteilen insgesamt zu störungsfreiem Betrieb und damit gesteigerter Effektivität. !The examples above clearly show that the bleaching aids according to the invention are significantly better. Stabilizing effects and whiteness gains than can be achieved with the respective individual components. In addition, water glass can be completely replaced, sometimes even a higher whiteness is achieved. Furthermore, it could be shown in these experiments that both when using water glass and when using the individual components alone, a significantly higher amount than when using the inventive Combination must be used. Thus, when the products according to the invention are used, the load on the circulating water with chemicals is reduced. Together with the advantages described above, this leads overall to trouble-free operation and thus increased effectiveness. !

Claims (5)

1.) Verfahren zum Bleichen von Holzschliff in Peroxid und/oder sulfithaltigen Lösungen, dadurch gekenn- .zeichnet, daß man den Bleichvorgang in Gegenwart von Phosphonsäuren, Polyhydroxycarbonsäuren und Phosphaten durchführt.1.) Process for bleaching ground wood in peroxide and / or sulfite-containing solutions, characterized in that the bleaching process is carried out in the presence of phosphonic acids, polyhydroxycarboxylic acids and phosphates. 2.) Verfahren nach Anspruch 1, dadurch gekennzeichnet, .daß als Phosphonsäure N,N-Bis(carboxy-methyl)-1'-amino-ethan-1,1-diphosphonsäure; N-2-carboxyethyl-1-amino-ethan-1,1-diphosphonsäure; N,N-Bis(hydroxymethyl)-1-amino-ethan-1,1-diphosphonsäure; 1,2,1-tricarboxybutan-2-phosphonsäure; Diethylentriaminpentamethylenphosphonsäure (DTPMP); Hydroxyethandisphosphonsäure (HEDP); Aminotrismethylenphosphonssäure (ATMP) bzw, die entsprechenden Salze dieser Säuren, als Polyhydroxycarbonsäuren, Gluconsäure, Citronensäure, N,N-Di- hydroxyethylenglycin, DTPA, EDTA, NTA bzw. deren Salze und als Phosphate Alkali- oder Erdalkalisalze der Orthophosphorsäure oder von Polyphosphorsäuren eingesetzt werden.2.) Process according to claim 1, characterized in that. N, N-bis (carboxymethyl) -1'-amino-ethane-1,1-diphosphonic acid as the phosphonic acid; N-2-carboxyethyl-1-amino-ethane-1,1-diphosphonic acid; N, N-bis (hydroxymethyl) -1-amino-ethane-1,1-diphosphonic acid; 1,2,1-tricarboxybutane-2-phosphonic acid; Diethylenetriaminepentamethylenephosphonic acid (DTPMP); Hydroxyethane disphosphonic acid (HEDP); Aminotrismethylenephosphonic acid (ATMP) or the corresponding salts of these acids, as polyhydroxycarboxylic acids, gluconic acid, citric acid, N, N-di-hydroxyethyleneglycine, DTPA, EDTA, NTA or their salts and as phosphates, alkali or alkaline earth metal salts of orthophosphoric acid or of polyphosphoric acids . 3.) Mittel zum Bleichen von Holzschliff,enthaltend Peroxid und/oder Sulfit, gekennzeichnet durch einen Gehalt an Phosphonsäure Polyhydroxycarbonsäure und Orthophosphorsäure oder Polyphosphorsäure bzw. deren Salze.3.) Means for bleaching ground wood, containing peroxide and / or sulfite, characterized by a content of phosphonic acid, polyhydroxycarboxylic acid and orthophosphoric acid or polyphosphoric acid or salts thereof. 4.) Mittel nach Anspruch 3, gekennzeichnet durch einen oder mehrere der Stoffe N,N-Bis(hydroxy-methyl)-1- amino-ethan-1,1-diphosphonsäure; N-2-carboxyethyl-1-amino-ethan-1,1-diphosphonsäure; N,N-Bis(hvdroxy- methyl)-1-amino-ethan-1,1-diohosphpnsäure; 1,2,1-tricarboxybutan-2-phosphonsäure; Diethylentriaminpentamethylenphosphonsäure (DTPM); Hydroxyethan disphosphonsäure (HEDP); Aminotrismethylenphosphossäure (ATMP)bzw. die entsprechenden Salze dieser Säuren, als Polyhydroxycarbonsäuren, Gluconsäure, Citronensäure, N,N-Dihydroxyethylenglycin, DTPA, EDTA, NTA oder deren Salze zusammen mit einem oder mehreren der Stoffe Glukonsäure, Citronensäure, N,N-Dihydroxy- ethylenglycon, DTPA, EDTA, NTA oder deren Salze, zusammen mit Alkali- oder Erdalkalisalzen der Orthophosphorsäure und/oder Polyphosphorsäure.4.) Composition according to claim 3, characterized by one or more of the substances N, N-bis (hydroxymethyl) -1-amino-ethane-1,1-diphosphonic acid; N-2-carboxyethyl-1-amino-ethane-1,1-diphosphonic acid; N, N-bis (hvdroxymethyl) -1-amino-ethane-1,1-diohosphonic acid; 1,2,1-tricarboxybutane-2-phosphonic acid; Diethylenetriaminepentamethylenephosphonic acid (DTPM); Hydroxyethane disphosphonic acid (HEDP); Aminotrismethylenephosphossic acid (ATMP) resp. the corresponding salts of these acids, as polyhydroxycarboxylic acids, gluconic acid, citric acid, N, N-dihydroxyethylene glycine, DTPA, EDTA, NTA or their salts together with one or more of the substances gluconic acid, citric acid, N, N-dihydroxyethylene glycol, DTPA, EDTA, NTA or its salts, together with alkali or alkaline earth metal salts of orthophosphoric acid and / or polyphosphoric acid. 5.) Mittel nach Anspruch 3 bis 4, gekennzeichnet durch ein Mischungsverhältnis der Komponenten von 8:1:1 bis 1:8:1 bis 1:1:8.5.) Composition according to claim 3 to 4, characterized by a mixing ratio of the components from 8: 1: 1 to 1: 8: 1 to 1: 1: 8.
EP84112648A 1983-10-21 1984-10-19 Process for bleaching ground wood pulp Expired EP0141355B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112648T ATE34790T1 (en) 1983-10-21 1984-10-19 METHOD OF BLEACHING WOOD Pulp.

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Application Number Priority Date Filing Date Title
DE3338260A DE3338260C1 (en) 1983-10-21 1983-10-21 Process and means for bleaching groundwood
DE3338260 1983-10-21

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EP0141355A1 true EP0141355A1 (en) 1985-05-15
EP0141355B1 EP0141355B1 (en) 1988-06-01

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US4752354A (en) * 1985-09-04 1988-06-21 Benckiser-Knapsack Gmbh Process and composition for bleaching wood pulp
EP0369711A2 (en) * 1988-11-11 1990-05-23 Albright & Wilson Limited Phosphate composition and uses thereof
WO1995012029A1 (en) * 1993-10-26 1995-05-04 Akzo Nobel N.V. Aminoalkane diphosphonic acids in pulp bleaching
WO1997006303A1 (en) * 1995-08-04 1997-02-20 Cht R. Beitlich Gmbh Method of stabilizing peroxide-containing alkaline bleach liquors for bleaching cellulose and other fibrous materials
WO1997030210A1 (en) * 1996-02-19 1997-08-21 Kemira Chemicals Oy Process for bleaching of a high yield pulp
WO1997030207A1 (en) * 1996-02-19 1997-08-21 Kemira Chemicals Oy Process for bleaching of chemical pulp
EP0845526A2 (en) * 1996-11-29 1998-06-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
EP0845525A2 (en) * 1996-11-29 1998-06-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
WO2009056893A2 (en) 2007-11-02 2009-05-07 Innospec Limited Process for bleaching pulp
US8802613B2 (en) 2007-12-13 2014-08-12 Akzo Nobel N.V. Stabilized hydrogen peroxide solutions

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DE4224607A1 (en) * 1992-07-25 1994-01-27 Benckiser Knapsack Ladenburg New biodegradable ether carboxylate stabilising agent - useful for oxidative or reductive bleaching of TMP, CTMP, mechanical wood pulp or chemical pulp and for de-inking waste paper
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GB2226341A (en) * 1988-11-11 1990-06-27 Albright & Wilson Stabilising hydrogen peroxide bleach
EP0369711A3 (en) * 1988-11-11 1990-11-22 Albright & Wilson Limited Phosphate composition and uses thereof
GB2226341B (en) * 1988-11-11 1993-06-02 Albright & Wilson Phosphate composition and uses thereof
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WO1997030210A1 (en) * 1996-02-19 1997-08-21 Kemira Chemicals Oy Process for bleaching of a high yield pulp
WO1997030207A1 (en) * 1996-02-19 1997-08-21 Kemira Chemicals Oy Process for bleaching of chemical pulp
EP0845526A2 (en) * 1996-11-29 1998-06-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
EP0845525A2 (en) * 1996-11-29 1998-06-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
EP0845526A3 (en) * 1996-11-29 1999-03-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
EP0845525A3 (en) * 1996-11-29 1999-03-03 Eka Chemicals AB Cleaning, disinfecting and bleaching composition
WO2009056893A2 (en) 2007-11-02 2009-05-07 Innospec Limited Process for bleaching pulp
WO2009056893A3 (en) * 2007-11-02 2009-07-02 Innospec Ltd Process for bleaching pulp
US8906199B2 (en) 2007-11-02 2014-12-09 Innospec Limited Process for bleaching pulp
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ATE34790T1 (en) 1988-06-15
DE3471705D1 (en) 1988-07-07
DE3338260C1 (en) 1985-07-25
EP0141355B1 (en) 1988-06-01

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