WO1997030208A1 - Procede applicable au traitement de la pate chimique - Google Patents

Procede applicable au traitement de la pate chimique Download PDF

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Publication number
WO1997030208A1
WO1997030208A1 PCT/FI1997/000106 FI9700106W WO9730208A1 WO 1997030208 A1 WO1997030208 A1 WO 1997030208A1 FI 9700106 W FI9700106 W FI 9700106W WO 9730208 A1 WO9730208 A1 WO 9730208A1
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WO
WIPO (PCT)
Prior art keywords
bleaching
pulp
process according
acid
chelating
Prior art date
Application number
PCT/FI1997/000106
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English (en)
Inventor
Ilkka Renvall
Reijo Aksela
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8545485&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997030208(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kemira Chemicals Oy filed Critical Kemira Chemicals Oy
Priority to AT97903408T priority Critical patent/ATE252176T1/de
Priority to DE69725558T priority patent/DE69725558T2/de
Priority to EP97903408A priority patent/EP0882151B1/fr
Priority to AU17973/97A priority patent/AU1797397A/en
Publication of WO1997030208A1 publication Critical patent/WO1997030208A1/fr

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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
    • 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

Definitions

  • the invention relates to a process for the bleaching or de- lignification of pulp, wherein, before bleaching or delignifi- cation with an oxygen chemical, the pulp is pretreated with a chelating agent in order to eliminate the adverse effects of any heavy metals present in the pulp.
  • ECF elementary chlorine free
  • TCF total chlorine free
  • Usable bleaching processes also include bleaching with peroxy compounds (such as peracetic acid, caron acid, or mixtures of peracids), a peroxide-enhanced oxygen step, and a peroxide-enhanced oxygen-alkali step.
  • peroxy compounds such as peracetic acid, caron acid, or mixtures of peracids
  • Such bleaching steps are most commonly preceded by the binding of heavy metals.
  • the metals can be removed by an acid wash. This is often disadvantageous, since at least some of the sub ⁇ sequent bleaching steps are carried out in alkaline conditions. If heavy metals are removed at a low pH, it is necessary first to use an acid in order to reach a low pH and in the next step an alkali to neutralize the acid. Furthermore, the acid wash removes Mg and Ca ions, which are regarded as advantageous for bleaching. The acid wash may also reduce the strength of the pulp.
  • Peroxy compounds such as peracetic acid and hydrogen peroxide are highly susceptible to the catalytic action of heavy metals.
  • the applicant's WO application publications 95/35406, 95/35407 and 95/35408 describe transition-metal activated bleaching with peroxy compounds in acid conditions. The success of the bleaching presupposes the binding of heavy metals before the bleaching and/or during the bleaching.
  • heavy metals are bound by using agents which chelate metal ions, for example poly- aminocarboxylic acids. These include in particular ethylene diamine tetra-acetic acid and its salts (EDTA) and diethylene triamine penta-acetic acid and its salts (DTPA).
  • EDTA ethylene diamine tetra-acetic acid and its salts
  • DTPA diethylene triamine penta-acetic acid and its salts
  • the ions the most detrimental in terms of bleaching are manganese (Mn), iron (Fe) and copper (Cu).
  • other heavy metals, such as chromium ions (Cr), etc. have a detrimental effect, both on the con ⁇ sumption of peroxy compounds and often on the bleaching result, by reducing, for example, the viscosity of the bleached pulp. Detrimental heavy metals originate in the pulp, the treatment waters and the pulp-treatment apparatus.
  • Effective chelating agents are often poorly biodegradable, as is DTPA, or are completely non-biodegradable, as is EDTA.
  • TCF bleaching has increased the use of the said chelating agents. Therefore interest has arisen in replacing poorly biodegradable chelating agents either in part or entire ⁇ ly with biodegradable chelating agents.
  • the bio ⁇ degradable chelating agents be preferably phosphorus-free and also contain as small an amount of nitrogen as possible.
  • Biodegradable complexing agents have been developed for deter ⁇ gent builders. They must at the same time have softening action on water, i.e. they must bind calcium ions and magnesium ions.
  • One such sequestering agent is ethylenediamine disuccinic acid (EDDS). This compound has three stereoisomers.
  • EP patent application 556 782 discloses the use of EDDS as an iron complexer in photography chemicals.
  • Example 9 of the pub ⁇ lication mentions that the ferric salts of EDTA, DTPA and HEDTA are not biodegradable.
  • the Fe 7 + salt of EDDS is biodegradable. The biodegradabilities of the compounds were tested in the example by a generally approved testing method
  • Another known biodegradable complexing agent is 2,2'-imino ⁇ disuccinic acid (ISA).
  • ISA 2,2'-imino ⁇ disuccinic acid
  • the use of this compound in alkaline detergents is disclosed in EP patent application 509 382.
  • the patent application mentions the use of 2,2'-iminodisuccinic acid as a stabilizer of peroxide compounds, in particular in alkaline detergent compositions which contain hydrogen peroxide and its derivatives.
  • only perborate is used. Since perborate releases hydrogen peroxide only slowly, no far-reaching conclusions can be drawn from the examples of the patent regarding the stabilization of hydrogen peroxide in similar detergent compositions.
  • DE patent application 4 216 363 discloses the use of ISA as a stabilizer of tensides. There is no mention of the use of a peroxide compound.
  • EP patent application 513 948 mentions the use of the substance in detergents which are intended for hard surfaces and contain an organic solvent boiling at approx. 90 °C. There is no mention of the use of a peroxide compound.
  • DE patent application 4 340 043 discloses the use of ISA as a bleaching agent in the bleaching of groundwood pulp.
  • the purpose of ISA is the stabilization of hydrogen peroxide, and the examples show that at a pH of 10 it is a better stabilizer than DTPA.
  • the object of the present invention is to eliminate the adverse effects of heavy metals in the bleaching and delignification of chemical pulp. It is also an object to obtain a biodegradable effective chelating agent which yields a good bleaching result.
  • n 1-3 m is 0-3 p is 1-3
  • R , R 2 3 and R 4 are H, Na, K, Ca or Mg
  • R 5 and R 6 are H, CH 2 OH, CH 2 CH 2 OH or
  • DTPA which is commonly used in the bleaching of pulp, chelates heavy metals best at a pH of approx. 5.
  • Suitable pH values in the use of the compounds in accordance with the in ⁇ vention for the pretreatment of pulp are pH 4-8, preferably pH 5.0-7.5 and most preferably pH 6.5-7.5. If the compounds are also used in the actual bleaching or delignification step, the suitable pH values are respectively pH 4-8, preferably pH 4-6 and most preferably pH 4-5. Since chelating can be carried out at a higher pH value, the consumption of alkali in the sub ⁇ sequent step is not as high as when the chelating is carried out at a lower pH. This is a clear advantage over, for example,
  • the process according to the invention can be used for all known chemical pulps. These include alkaline and neutral sul- fite pulps, soda pulps, sulfate pulps (kraft pulps) and oxygen- delignified (oxygen cooking) sulfate pulps. Furthermore, the process can be used in the bleaching of so-called organosolv pulps in which alcohols or organic acids have been used as the cooking solvent, for example Milox cooking in formic acid.
  • the chelating process according to the invention may also be used when polysulfides or, for example, anthraquinone, have/has been used in sulfate cooking.
  • the treatment can be carried out on pulp cooked from different fiber raw materials, such as softwood, hardwood or reed, straw or other raw material of vegetable origin.
  • the chelating process according to the invention with compounds of Formula I is used as a pretreatment before bleaching or delignification with oxygen chemicals.
  • Chelating agents according to Formula I such as EDDS and ISA, can also be used as a chelating agent in bleaching or delig ⁇ nification with oxygen chemicals.
  • bleaching with peracetic acid bleaching with mixtures of peracids, bleaching with hydrogen peroxide, bleaching with mixtures of hydrogen peroxide and peracids, transition-metal catalyzed hydrogen peroxide bleaching within the acid pH range, developed by the applicant, alkaline peroxide bleaching, and combinations of all these, as well as oxygen delignification, peroxide-enhanced oxygen-alkali steps and pressurized peroxide steps and, in conjunction with these, optional treatments with enzymes, ozone or chlorine dioxide.
  • the chelating process according to the invention can be used as a pretreatment for pulp bleaching or delignification in acid conditions and possibly also in the bleaching or delignifica ⁇ tion step itself.
  • the pH control of an acid chelating step can be carried out using conventional mineral acids, such as sulfuric acid, sulfur dioxide or an aqueous solution thereof, carbon dioxide, or organic acids such as formic acid and acetic acid.
  • mineral acids such as sulfuric acid, sulfur dioxide or an aqueous solution thereof, carbon dioxide, or organic acids such as formic acid and acetic acid.
  • an especially suit ⁇ able chelating agent according to Formula I may be ethylenedi- amine-N,N' -disuccinic acid, its various isomers and its alkali metal salts, such as sodium and potassium salts, and its earth- alkali metal salts, such as calcium and magnesium salts. It is also possible to use ethylenediamine-N,N'-disuccinic acid to ⁇ gether with calcium sulfate and/or magnesium sulfate.
  • Another particularly suitable chelating agent is 2,2'-iminodisuccinic acid, its various isomers and its alkali metal salts, such as sodium and potassium salts, and its earth-alkali metal salts, such as calcium and magnesium salts. It is also possible to use 2,2'-iminodisuccinic acid together with calcium sulfate and/or magnesium sulfate.
  • Usable chelating agents also include N-(l,2-dicarboxyethyl)-N- (2-hydroxyethyl)aspartamic acid, its various isomers and its alkali metal salts and earth-alkali metal salts.
  • the acid may also be used together with potassium sulfate or magnesium sulfate.
  • the chelating agent may be added in an amount of 0.1-5 kg, preferably 0.5-2 kg per metric ton of dry pulp.
  • EDDS and ISA can be used to ⁇ gether with hydroxycarboxylic acids without the bleaching result being worsened.
  • EDDS and ISA may in part be replaced with chelating agents which do not contain nitrogen, such as hydroxycarboxylic acids having the general formula II
  • n 1-8, m is 0-2n, p is 0-n, q is 0-2,
  • R- ⁇ is COOH
  • R 2 is H, CH 2 OH or COOH.
  • carboxylic acids, hydroxy ⁇ carboxylic acids, polyhydroxycarboxylic acids and hydroxypoly- carboxylic acids according to Formula II such as citric acid, tartaric acid, lactic acid, pimelic acid, glutamic acid, gluco- heptonic acid, ascorbic acid, glycolic acid, glutaric acid, adipic acid, succinic acid or alonic acid, can be used as replacement chelating agents.
  • hydroxy acids can be used as chel ⁇ ating agents in bleaching.
  • the said substances are quite poor binders of heavy metals, but bind well calcium and magnesium.
  • citric acid has been used as a replacement for phos ⁇ phates in phosphate-free detergents and cleansing agents, in which the substances are required to bind calcium and mag ⁇ nesium.
  • Especially the binding of magnesium should be dis ⁇ advantageous in terms of bleaching.
  • CS stands for consistency
  • PAA for a peracetic acid treatment
  • mP for a olybdate-activated peroxide treatment
  • O for an oxygen treat ⁇ ment
  • P for an alkaline peroxide treatment
  • chelat ⁇ ing step The doses in the tables are indicated in kilograms per metric ton of pulp (kg/tp).
  • Na ⁇ DTPA stands for the pentasodium salt of DTPA
  • Na ⁇ EDTA stands for the tetrasodium salt of EDTA
  • H4EDDS stands for the acid form of EDDS.
  • the pH used will determine how the chelating agents are dissociated, i.e. in which form they actually appear in the treatment.
  • the H ⁇ EDDS (reaction mixture) mentioned in the table refers to experiments in which the chelating agent used was an unpurified reaction product directly from the process for the preparation of EDDS.
  • Table 2 shows the results of washing experiments similar to those described in Example 1, when EDDS was diluted with cer ⁇ tain hydroxy acids.
  • DTPA is usually dosed into a softwood pulp at a rate of approx. 2 kg/tp.
  • Table 2 the effect of the DTPA dose on the chelating of metals was first investigated. Chelating was clearly less when the dose of EDDS was reduced from a rate of 2.0 kg/tp to a rate of 1.0 kg/tp or 0.5 kg/tp. In the previous series of experiments (Table 1) it was observed that when Na ⁇ EDDS was used at a rate of 1.5 kg/tp, chelating was as com ⁇ plete as when Na 5 DTPA was used at a rate of 2.0 kg/tp.
  • the nitrogen load in the effluents from the chelating step can be reduced significantly, while the chelating of the metals is still sufficiently com ⁇ plete for bleaching.
  • Na ⁇ DTPA stands for the pentasodium salt of DTPA
  • Na ⁇ EDTA stands for the tetrasodium salt of EDTA
  • ISA stands for the acid form of iminodisuccinic acid of ISA.
  • pH used that determines how the chelating agents are is the pH used that determines how the chelating agents are dissociated, i.e. in which form they actually are present in the treatment.
  • Chelating with a mixture of ISA and the sodium salt of citric acid was also successful, considering that the chelating was carried out at a pH of 7.7.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne un procédé de blanchiment ou de délignification de la pâte chimique consistant, avant blanchiment ou délignification au moyen d'un produit chimique à base d'oxygène, à faire subir à la pâte un traitement préalable au moyen d'un agent chélateur de façon à supprimer les effets néfastes imputables à un quelconque métal lourd présent dans la pâte. L'agent chélateur utilisé est constitué de composés représentés par la formule générale (I) dans laquelle n = 1 à 3, m = 0 à 3, p = 1 à 3, R1, R2, R3 et R4 sont H, Na, K, Ca ou Mg, R5 et R6 sont H, CH2OH, CH2CH2OH ou CH2O(CH2CH2O)1-10CH2CH2OH.
PCT/FI1997/000106 1996-02-19 1997-02-19 Procede applicable au traitement de la pate chimique WO1997030208A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT97903408T ATE252176T1 (de) 1996-02-19 1997-02-19 Verfahren zur behandlung von chemischem zellstoff
DE69725558T DE69725558T2 (de) 1996-02-19 1997-02-19 Verfahren zur behandlung von chemischem zellstoff
EP97903408A EP0882151B1 (fr) 1996-02-19 1997-02-19 Procede applicable au traitement de la pate chimique
AU17973/97A AU1797397A (en) 1996-02-19 1997-02-19 Process for the treatment of chemical pulp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI960756 1996-02-19
FI960756A FI115469B (fi) 1996-02-19 1996-02-19 Menetelmä kemiallisen selluloosamateriaalin käsittelemiseksi

Publications (1)

Publication Number Publication Date
WO1997030208A1 true WO1997030208A1 (fr) 1997-08-21

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Application Number Title Priority Date Filing Date
PCT/FI1997/000106 WO1997030208A1 (fr) 1996-02-19 1997-02-19 Procede applicable au traitement de la pate chimique

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EP (1) EP0882151B1 (fr)
AT (1) ATE252176T1 (fr)
AU (1) AU1797397A (fr)
DE (1) DE69725558T2 (fr)
FI (1) FI115469B (fr)
WO (1) WO1997030208A1 (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004775A1 (fr) * 1996-07-26 1998-02-05 Basf Aktiengesellschaft Utilisation d'agents complexants pour le blanchiment de la cellulose et du bois, pour la fabrication du papier et le desencrage de vieux papiers
WO1999027178A1 (fr) * 1997-11-25 1999-06-03 Amylum Belgium N.V. Perfectionnements apportes au procede de blanchiment de la pate chimique et dispersions intermediaires de pate
WO1999046440A1 (fr) * 1998-03-10 1999-09-16 Solvay (Societe Anonyme) Procede de blanchiment de pate a papier
WO1999046441A1 (fr) * 1998-03-10 1999-09-16 Solvay (Societe Anonyme) Procede de blanchiment et/ou de delignification de pates a papier
WO1999054544A1 (fr) * 1998-04-17 1999-10-28 Alberta Research Council Inc. Procede de production de pate lignocellulosique a partir d'especes non ligneuses
KR100260833B1 (ko) * 1997-12-27 2000-07-01 차동천 고수율기계펄프의 제조방법
WO2000073576A1 (fr) * 1999-06-01 2000-12-07 Aga Aktiebolag Blanchiment de la lignine et procede de production de papier
US6590120B1 (en) 1998-03-09 2003-07-08 Kemira Chemicals Oy Methods for the preparation of an N-bis-[2-(1,2-dicarboxy-ethoxy)-ethyl]amine derivative and products of the methods and their uses
GB2391011A (en) * 2002-07-19 2004-01-28 Crosmill Ltd Bleaching cellulose suspensions
WO2010084351A1 (fr) * 2009-01-26 2010-07-29 Innospec Limited Agents chélatants et procédés liés à ceux-ci
WO2011059376A1 (fr) * 2009-11-11 2011-05-19 Metso Paper, Inc. Procédé de fabrication de pâte à papier à partir d'un matériau lignocellulosique contenant de la silice
WO2014140852A3 (fr) * 2013-03-14 2015-01-08 Gp Cellulose Gmbh Procédé de fabrication d'une fibre kraft extrêmement fonctionnelle et de viscosité faible, en utilisant une séquence de blanchiment acide, et fibre fabriquée par ce procédé
WO2014140940A3 (fr) * 2013-03-15 2015-01-08 Gp Cellulose Gmbh Fibre kraft à faible viscosité ayant une teneur en carboxyle améliorée et procédés de production et d'utilisation de celle-ci
WO2015138335A1 (fr) * 2014-03-12 2015-09-17 Gp Cellulose Gmbh Fibre kraft à faible viscosité à teneur accrue en carboxyle, procédés de production et utilisation
US9512563B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Surface treated modified cellulose from chemical kraft fiber and methods of making and using same
US9512561B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512237B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Method for inhibiting the growth of microbes with a modified cellulose fiber
US9511167B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10865519B2 (en) 2016-11-16 2020-12-15 Gp Cellulose Gmbh Modified cellulose from chemical fiber and methods of making and using the same
CZ309643B6 (cs) * 2021-07-21 2023-06-07 Univerzita Pardubice Hořečnaté sole derivátů asparagové kyseliny a jejich použití jako stabilizátorů peroxidu vodíku

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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WO2009154898A1 (fr) 2008-06-20 2009-12-23 International Paper Company Composition et feuille d'impression présentant des propriétés optiques améliorées

Citations (4)

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EP0509382A2 (fr) * 1991-04-17 1992-10-21 Hampshire Chemical Corporation Stabilisateurs de blanchiment biodégradables pour détergents
WO1994003553A1 (fr) * 1992-08-01 1994-02-17 The Procter & Gamble Company Composition de blanchiment peroxy stabilisee a l'acide ethylenediamine-n,n'-disuccinique
WO1995014808A1 (fr) * 1993-11-24 1995-06-01 Henkel Kommanditgesellschaft Auf Aktien Utilisation d'agents complexants contenant de l'azote dans le blanchiment de la pate mecanique
WO1996019557A2 (fr) * 1994-12-22 1996-06-27 Basf Aktiengesellschaft Utilisation d'acides hydroxyalkylaminocarboxyliques comme agents complexants

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509382A2 (fr) * 1991-04-17 1992-10-21 Hampshire Chemical Corporation Stabilisateurs de blanchiment biodégradables pour détergents
WO1994003553A1 (fr) * 1992-08-01 1994-02-17 The Procter & Gamble Company Composition de blanchiment peroxy stabilisee a l'acide ethylenediamine-n,n'-disuccinique
WO1995014808A1 (fr) * 1993-11-24 1995-06-01 Henkel Kommanditgesellschaft Auf Aktien Utilisation d'agents complexants contenant de l'azote dans le blanchiment de la pate mecanique
WO1996019557A2 (fr) * 1994-12-22 1996-06-27 Basf Aktiengesellschaft Utilisation d'acides hydroxyalkylaminocarboxyliques comme agents complexants

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004775A1 (fr) * 1996-07-26 1998-02-05 Basf Aktiengesellschaft Utilisation d'agents complexants pour le blanchiment de la cellulose et du bois, pour la fabrication du papier et le desencrage de vieux papiers
WO1999027178A1 (fr) * 1997-11-25 1999-06-03 Amylum Belgium N.V. Perfectionnements apportes au procede de blanchiment de la pate chimique et dispersions intermediaires de pate
KR100260833B1 (ko) * 1997-12-27 2000-07-01 차동천 고수율기계펄프의 제조방법
US6590120B1 (en) 1998-03-09 2003-07-08 Kemira Chemicals Oy Methods for the preparation of an N-bis-[2-(1,2-dicarboxy-ethoxy)-ethyl]amine derivative and products of the methods and their uses
BE1011784A3 (fr) * 1998-03-10 2000-01-11 Solvay Procede de blanchiment de pate a papier.
BE1011785A3 (fr) * 1998-03-10 2000-01-11 Solvay Procede de blanchiment et/ou de delignification de pates a papier chimiques.
WO1999046441A1 (fr) * 1998-03-10 1999-09-16 Solvay (Societe Anonyme) Procede de blanchiment et/ou de delignification de pates a papier
WO1999046440A1 (fr) * 1998-03-10 1999-09-16 Solvay (Societe Anonyme) Procede de blanchiment de pate a papier
WO1999054544A1 (fr) * 1998-04-17 1999-10-28 Alberta Research Council Inc. Procede de production de pate lignocellulosique a partir d'especes non ligneuses
US6258207B1 (en) 1998-04-17 2001-07-10 Alberta Research Council Inc. Alkaline peroxide mechanical pulping of non-woody species
WO2000073576A1 (fr) * 1999-06-01 2000-12-07 Aga Aktiebolag Blanchiment de la lignine et procede de production de papier
US6679972B1 (en) 1999-06-01 2004-01-20 Aga Aktiebolag Process for the bleaching of a pulp suspension by separating calcium from lignin
GB2391011A (en) * 2002-07-19 2004-01-28 Crosmill Ltd Bleaching cellulose suspensions
US8801962B2 (en) 2009-01-26 2014-08-12 Innospec Limited Chelating agents and methods relating thereto
WO2010084351A1 (fr) * 2009-01-26 2010-07-29 Innospec Limited Agents chélatants et procédés liés à ceux-ci
US9512561B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9970158B2 (en) 2009-05-28 2018-05-15 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
USRE49570E1 (en) 2009-05-28 2023-07-04 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US11111628B2 (en) 2009-05-28 2021-09-07 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10731293B2 (en) 2009-05-28 2020-08-04 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10106927B2 (en) 2009-05-28 2018-10-23 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512563B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Surface treated modified cellulose from chemical kraft fiber and methods of making and using same
US9926666B2 (en) 2009-05-28 2018-03-27 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512237B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Method for inhibiting the growth of microbes with a modified cellulose fiber
US9512562B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9511167B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9777432B2 (en) 2009-05-28 2017-10-03 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9909257B2 (en) 2009-05-28 2018-03-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
CN102597366A (zh) * 2009-11-11 2012-07-18 美佐纸业股份有限公司 由含二氧化硅的木质纤维素材料生产纸浆的方法
WO2011059376A1 (fr) * 2009-11-11 2011-05-19 Metso Paper, Inc. Procédé de fabrication de pâte à papier à partir d'un matériau lignocellulosique contenant de la silice
US10138598B2 (en) 2013-03-14 2018-11-27 Gp Cellulose Gmbh Method of making a highly functional, low viscosity kraft fiber using an acidic bleaching sequence and a fiber made by the process
WO2014140852A3 (fr) * 2013-03-14 2015-01-08 Gp Cellulose Gmbh Procédé de fabrication d'une fibre kraft extrêmement fonctionnelle et de viscosité faible, en utilisant une séquence de blanchiment acide, et fibre fabriquée par ce procédé
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FI960756A0 (fi) 1996-02-19
DE69725558D1 (de) 2003-11-20
EP0882151A1 (fr) 1998-12-09
FI960756A (fi) 1997-08-20
AU1797397A (en) 1997-09-02
EP0882151B1 (fr) 2003-10-15
FI115469B (fi) 2005-05-13
DE69725558T2 (de) 2004-08-05
ATE252176T1 (de) 2003-11-15

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