EP2406425B1 - Verfahren und chemische zusammensetzung zur verbesserung der substanzausnutzung von holzstoff - Google Patents

Verfahren und chemische zusammensetzung zur verbesserung der substanzausnutzung von holzstoff Download PDF

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Publication number
EP2406425B1
EP2406425B1 EP10706889.2A EP10706889A EP2406425B1 EP 2406425 B1 EP2406425 B1 EP 2406425B1 EP 10706889 A EP10706889 A EP 10706889A EP 2406425 B1 EP2406425 B1 EP 2406425B1
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Prior art keywords
composition
pulp
wood chips
mechanical
bleaching
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English (en)
French (fr)
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EP2406425A1 (de
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Prasad Duggirala
Sergey M. Shevchenko
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ChampionX LLC
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Nalco Co LLC
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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
    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/64—Alkaline compounds
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating 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
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • This invention relates to improving fiber quality and process efficiency in mechanical pulping. More specifically, the invention relates to using specialty chemical compositions such as combinations of a reductive chemical and a chelant in an alkaline medium to improve the process efficiency and brightness of a paper product produced from a pulp material manufactured in such a process.
  • the invention has particular relevance for decreasing freeness, providing energy and chemical savings, and enhancing brightness of paper products.
  • Mechanical pulping is a common method to produce pulp.
  • One advantage mechanical pulping has over other pulping methods is that the pulping process does not result in a significant loss of mass.
  • Mechanical pulping operations unfortunately are very energy-intensive and they tend to produce pulps with low strength.
  • Chemical treatment, such as alkalization is sometimes used to increase strength and save energy, at the expense of brightness.
  • Several technologies are currently practiced in mechanical pulping to manufacture products such as stone ground wood (SGW), pressurized ground wood (PGW), refiner mechanical pulp (RMP), pressurized RMP (PRMP), thermo-RMP (TRMP), and thermo-mechanical pulp (TMP).
  • At least one embodiment of the invention is directed towards a composition and a method of its use.
  • the composition improves the papermaking process.
  • the composition comprises a base, a small quantity of a strong reductive chemical comprising NaBH 4 , and a chelating agent.
  • the composition is added to the papermaking process before or during the mechanical pulping of wood chips.
  • the composition decreases the energy consumption in pulp manufacturing but does not induce a net decrease in brightness of paper produced from the paper pulp when compared to paper similarly produced from similar paper pulp that did not have the composition added to its wood chips.
  • the composition can be an aqueous solution or slurry capable of being applied at any stage of the mechanical pulping process, before or during the refining, e.g., in a wood chip washing operation, chip soaking, sprayed over the chips, and may be capable of being added directly into a refiner.
  • At least one embodiment of the invention is directed towards a composition wherein the base is magnesium hydroxide.
  • a composition wherein the base is magnesium hydroxide and an alkali or alkaline earth metal hydroxide such as sodium hydroxide.
  • One preferred composition can induce the resulting pulp to be more effectively bleached by peroxide or hydrosulfite bleaching including but not limited to treatment with magnesium hydroxide. Treatment of wood chips before or during mechanical pulping with small quantities of magnesium hydroxide, activates the pulp to subsequent bleaching, specifically peroxide bleaching.
  • the invention is directed towards a composition in which the reductive chemical comprises sodium borohydride.
  • a composition in which the reductive chemical is sodium borohydride and a chemical selected from the list consisting of: water soluble hydrosulfites (dithionites), sulfites, bisulfites, metabisulfites, formidinesulfinic acid, salts of formidinesulfinic acid, borohydrides, phosphines, phosphonium tertiary salts; more specifically, alkali or alkaline earth metal hydrosulfites, borohydrides, sodium hydrosulfite, and any combination thereof.
  • the chelating agent can be a transitional metal ion chelant selected from the list consisting of: organic hydroxyacids, aminophosphonates, aminophosphates, aminocarboxylates; more specifically, salts of DTPA, salts of EDTA, salts of DTMPA, and any combination thereof.
  • CSF Canadian Standard Freeness a described by TAPPI methods and standards and measured in millimeters.
  • Freeness means the measure of the rate at which a suspension of pulp may be drained, and is typically measured according to the Canadian Standard Freeness test, as defined by TAPPi methods and standards. Changes in freeness can result from both chemical and physical changes in pulp.
  • Mechanical pulping means a physical change caused by converting pulpwood logs and chips into pulp by the use of mechanical energy.
  • Chemimechanical pulping means a mild chemical change occurring in a wood grinding or chip refining process. Chemimechanical pulping commonly improves paper strength or facilitates paper production.
  • Refiner groundwood means mechanical pulp made with a grinder and put through a rubbing, brushing, crushing, fraying, or cutting treatment in a pulp mill processing machine called a refiner.
  • Refiner mechanical pulp means pulp made by processing untreated wood chips in mechanical atmospheric refiners.
  • Refiner means a machine for mechanical treating fibers in pulp and paper mills when rubbing, brushing, crushing, fraying, or cutting is desired to process or impart certain properties to the finished pulp slurry and the sheet web formed on the paper machine.
  • Standard Quantity means a concentration of an additive added to a suspension of paper pulp, which is insufficient to induce any substantial chemical changes in the pulp that are normally associated with chemimechanical pulping.
  • magnesium hydroxide is used as a source of alkalinity.
  • the magnesium hydroxide activates the pulp in the following peroxide or hydrosulfite bleaching stages, thereby increasing the degree of brightness that results from bleaching.
  • the reaction in the refiner is adjusted to be reductive not oxidative. This also inhibits any brightness loss that uncontrolled oxidation would otherwise cause.
  • a chelating agent may be added which further reduces any yellowing because it immobilizes transition metal cations that could otherwise catalyze yellowing reactions.
  • magnesium hydroxide is combined with one or more reducing agents including sodium borohydride and one or more chelating agents prior to the refining or in the refiner. In at least one embodiment, this combination is followed by peroxide bleaching.
  • specialty chemicals are used in very small quantities and are believed to operate against the pulp only at a mechanical level and not at a chemimechanical level. Because of the low quantity used, no significant chemical changes occur in the pulp. The low quantity of specialty chemicals, however, is sufficient to cause the freeness reduction in the pulp and thereby reduce the energy consumption during the mechanical pulping process. Because relatively little chemical changes occur in the pulp, this method can freely be used with most if not all currently known techniques used in most operating mills manufacturing mechanical pulp, which include but are not limited to TMP, RMP, and/or groundwood based pulps.
  • Small quantities of at least one reductive chemical and at least one chelant in an alkaline medium can be used to treat wood chips during manufacturing of mechanical pulp. When these chemicals are so combined, instead of the brightness loss that is typical of alkaline treatments, a brightness gain occurs.
  • the small quantity of at least one reductive chemical and at least one chelant in an alkaline medium, applied prior to or at the refining stage, can enhance the bleaching process performed later in the papermaking process.
  • the specialty chemicals added prior to or at the refining stage i.e. magnesium hydroxide in a mixture with reductive chemical(s) including sodium borohydride and, chelant(s)
  • the bleaching is peroxide or hydrosulfite bleaching.
  • the at least one of the sources of alkali comprises magnesium hydroxide (MH).
  • the MH is used by itself, and the positive effect on brightness is observed after the peroxide or hydrosulfite bleaching stage.
  • a combination of the MH with sodium hydrosulfite and a chelant which does not fall within the claimed invention.
  • At least one of the reductive chemicals may be sodium hydrosulfite (SH).
  • SH may be combined with magnesium hydroxide and a chelant in a combination which does not fall within the claimed invention.
  • small quantities of a strong reductive chemical such as SH with sodium borohydride (BH) are combined with MHAlso disclosed are small quantities of a strong reductive chemical such as SH with or without BH are combined with sodium hydroxide in a combination which does not fall within the claimed invention.
  • At least one of the reductive chemicals is very small quantity of BH.
  • the BH is combined with sodium hydrosulfite and a chelant in a combination which does not fall within the claimed invention.
  • the source of alkali is MH.
  • a small quantity of a strong reductive chemical such as SH with BH combined with MH.
  • magnesium hydroxide in the refiner is described among other places in Chinese Patent Application CN 2008-10014053 20080123 . This description is directed to a process known as refiner bleaching conducted with Mg(OH) 2 and hydrogen peroxide. None of any of these references describes using magnesium hydroxide in mechanical pulping, either by itself or in combination with small amounts of reductive chemicals, or use of these chemicals in mechanical pulping operations in a basic environment.
  • WO 9722749 discusses a method of reducing the energy in a pulping process but it involves adjusting the pH and overall different treatment procedure targeting the crystalline structure of cellulose.
  • US 5,338,402 utilizes similar chemicals to the invention but only in quantities large enough for chemimechanical pulping, targeting different pulp properties, and under different process conditions. For example, it mentions manufacturing CTMP that involves cooking at a temperature equal to or greater than 100 C using a reducing agent more electronegative than the sulfite ion together with sodium sulfite or bisulfite or a mixture of sulfur dioxide and sodium 'hydroxide.
  • the reducing agent may be thiourea dioxide, sodium borohydride, or sodium Dithionite.
  • Another prior art source describes a multistage pretreatment process involving a reducing agent but is dissimilar to the inventive one step process.
  • the source describes producing bleached pulp from wood chips via a process involving pretreatment of the chips first with at least one reducing agent (e.g., with a mixture of sodium sulfite and sodium borohydride) and then with an alkaline peroxide solution.
  • the pretreatments were followed by refiner defibration. ( Brightening of Douglass-Fir Groundwood, Betz, R. G., Styan G. E., Pulp Paper Magazine Canada (1974) Volume 75 Pages 111-114 ).
  • WO 2008058003 A2 provides a composition and method for improving a mechanical pulping process by decreasing freeness and amount of shives, providing energy and chemical savings, and enhancing brightness and mechanical strength of paper product made from a pulp material in the process.
  • the composition includes formulations, such as surfactants, chelants, hydrotopes, reductive and oxidative pulp modifiers, and pH-controlling chemicals.
  • the method includes selectively introducing these formulations to the pulp material in the mechanical pulping process.
  • WO 2005/106110 describes a method of producing hardwood pulp.
  • the method comprises treating hardwood chips with one or more than one Family 11 xylanase enzyme in the absence of adding an oxidizing enzyme for about 5 minutes to about 120 minutes, to produce a treated chip mixture.
  • the treated chip mixture is then mechanically refined to produce the hardwood pulp.
  • the specialty chemicals darken the pulp
  • the resulting paper is not dark.
  • the pulp is darkened due to alkalization.
  • the specialty chemicals activate the pulp, the process of subsequently bleaching the darkened mechanical pulp is enhanced and less bleach is needed.
  • This method is particularly effective with magnesium hydroxide as the source of alkali, and when the bleaching is accomplished by peroxide bleaching. Pulp activation targeted towards post-refiner bleaching can be achieved by application of magnesium hydroxide alone.
  • magnesium hydroxide and sodium hydrosulfite may be combined with the mechanical pulp in a refiner to produce brighter mechanical pulp, in a combination which does not fall within the claimed invention.
  • a chelant is also added to wood chips prior to the refining operation or in the refiner.
  • magnesium hydroxide with a chelant.
  • magnesium hydroxide improves pulp brightness after hydrosulfite and, especially, peroxide bleaching by pulp activation towards these processes, while immediate post-refining brightness may still decrease.
  • the specialty chemicals are in the form of an aqueous solution or slurry that can be fed directly to the refiner or sprayed over wood chips.
  • the specialty chemicals are in the form of an aqueous solution or slurry that can be applied on wood chips during soaking or washing operations.
  • Pulp samples were obtained from Midwestern American mills and from European mills (softwood TMP, TMP 1 st and 2 nd rejects). The doses are based on actives unless stated otherwise. DTPA has always been used in a form of a 38% solution (normally used in the industry) and the doses refer to this solution.
  • Test A High temperature shock conditions: borohydride-based compositions with sodium hydroxide
  • Test B Moderate temperature shock conditions: hydrosulfite-containing compositions with sodium hydroxide
  • Test C Hydrosulfite treatment with sodium hydroxide followed by bleaching
  • the samples were prepared as described in Test B, washed, dewatered and bleached under standard conditions (70°C, 1 h, 1.5% NaOH, 2% H 2 O 2 ). The samples were washed, and handsheets were made upon acidification to pH 5.
  • Test E High temperature shock conditions: hydrosulfite-containing compositions with magnesium hydroxide
  • a brightness test was conducted under wet temperature shock conditions simulating those in the refiner (no mechanical treatment).
  • Samples of TMP were placed in plastic bags and mixed well with magnesium hydroxide and DTPA. The bags were opened, and the samples transferred into stainless steel digesters and degassed with nitrogen, for 7 minutes each. The remaining chemicals were added via a syringe into the volume of the pulp in a nitrogen flow.
  • the 5%-consistency samples were kept at 150°C for 10 min in a rotating digester setup, cooled down, washed, pH measured and either handsheets were made or the pulp was subsequently bleached.
  • the pH in all of the samples went from alkaline to slightly acidic, indicating a finished chemical reaction; therefore no acidification of the slurries was needed.
  • Test F Moderate temperature shock conditions: hydrosulfite-containing compositions with magnesium hydroxide
  • Test G Hydrosulfite treatment with magnesium hydroxide followed by peroxide bleaching
  • Samples were prepared as described in Test E or F, washed with 2L DI water, dewatered and bleached under standard conditions (70°C, 1 h, 1.5% NaOH, 2% H 2 O 2 ). The samples were washed with 2L DI water and handsheets made upon acidification to pH 5.
  • Test H Hydrosulfite treatment with magnesium hydroxide followed by hydrosulfite bleaching
  • Samples were prepared as described in Test E or F, washed with 1L DI water, dewatered and bleached under standard conditions (70°C, 1 h, 1 Na 2 S 2 O 4 ). The samples were washed with 2L DI water, and handsheets were made.
  • results of tests A-H are provided in the following tables 1-18 in which the parenthesis next to the table number indicates which data corresponds to which tests.
  • Table 3 (A) (Reference samples) Sample Brightness Control 52.42 0.75% NaOH 50.02 0.75% NaOH + 0.25% NaBH 4 52.88 0.75% NaOH + 0.1% NaBH 4 52.10 0.75% NaOH + 0.1% NaBH 4 + 0.1% DTPA 53.13 1% NaOH + 0.25% NaBH 4 51.92
  • Table 4 (A) (Reference samples) Sample Brightness Control 52.30 0.75% NaOH 49.27 0.75% NaOH + 0.23% NaBH 4 52.5 0.75% NaOH + 0.1% NaBH 4 51.62 0.75% NaOH + 0.05% NaBH 4 51.01 0.75% NaOH + 0.05% NaBH 4 + 0.05% DTPA 51.47 0.75% NaOH + 0.025% NaBH 4 + 0.05% DTPA 50.6
  • Table 5 (B) (Reference compositions) Sample Brightness Control 55.82 0.75%NaOH 54.08 0.75% NaOH + 0.2% Na 2 S 2 O 4 55.02 0.75% NaOH + 0.5% Na 2 S 2 O 4 55.92 0.75% NaOH + 0.2% Na 2 S 2 O 4 + 0.05% NaBH 4 55.98 0.75% NaOH + 0.2% Na 2 S 2 O 4 + 0.05% NaBH 4 + 0.05% DTPA 56.21 0.75% NaOH + 0.2% Na 2 S 2 O 4 + 0.025% NaBH 4 + 0.05% DTPA 55.66
  • Table 5 lists the effect on brightness upon the thermal treatment of the pulp after the composition underwent peroxide bleaching.
  • Tables 6-9 list the effect of the compositions (prototype products, 27% total solids) on paper products.
  • Table 6 (C) (Reference compositions) Sample Brightness Control 61.17 0.75% NaOH 59.78 0.75% NaOH + 0.3% Na 2 S 2 O 4 + 0.05% DTPA 62.33 0.75% NaOH + 0.3% Na 2 S 2 O 4 + 0.025% NaBH 4 + 0.05% DTPA (I) 63.79 0.75% NaOH + 0.3% Na 2 S 2 O 4 + 0.0125% NaBH 4 + 0.05% DTPA (II) 63.81
  • Table 7 (C) (Reference compositions) Sample Brightness Control 61.36 0.75% NaOH 58.90 0.75% NaOH + 0.025% NaBH 4 + 0.05% DTPA 63.46 0.75% NaOH + 0.3% Na 2 S 2 O 4 + 0.025% NaBH 4 + 0.05% DTPA (I) 66.38 0.75% NaOH + 0.3% Na 2 S 2
  • Tables 9 and 10 provide the effect of one of preferred compositions, 19% NaOH, 0.316% NaBH 4 , 0.48% DTPA, 6.32% Na 2 S 2 O 4 (26.1-27.2% solids, depends on the impurities in the solid hydrosulfite).
  • the composition was then diluted in paper pulp slurry so that the NaOH was reduced to 0.75% to o.d. pulp.
  • Table 11 indicates the effect of using magnesium hydroxide as the alkali. Magnesium hydroxide is less expensive than other alkali. Compositions containing magnesium hydroxide requires less energy to undergo the pulping process. When substituting magnesium hydroxide for sodium hydroxide the replacement ratio is 0.75% sodium hydroxide for 0.5% magnesium hydroxide.
  • Table 17 Sample Brightness Control 59.22 0.5% Mg(OH) 2 57.79 0.5% Mg(OH) 2 +0.05%DTPA +0.25% Na 2 S 2 O 4 +0.0125%NaBH 4 ⁇ 59.68 0.5% Mg(OH) 2 +0.05%DTPA +0.125% Na 2 S 2 O 4 58.43 ⁇ sample of the invention
  • Table 18 Sample Brightness Control 51.42 0.5% Mg(OH) 2 51.97 0.5% Mg(OH) 2 +0.05%DTPA 52.46 0.5% Mg(OH) 2 +0.05%DTPA +0.25% Na 2 S 2 O 4 56.03 0.5% Mg(OH) 2 +0.05%DTPA +0.25% Na 2 S 2 O 4 +0.0125%NaBH 4 ⁇ 55.43

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Claims (10)

  1. Zusammensetzung, die einen mechanischen Papierherstellungsvorgang verbessert, wobei die Zusammensetzung Folgendes umfasst:
    eine Base, die Magnesiumhydroxid und eine kleine Menge einer reduktiven Chemikalie umfasst, die NaBH4 umfasst, und einen Chelatbildner, wobei die Zusammensetzung dem Papierherstellungsvorgang spätestens dann hinzugefügt wird, wenn das mechanische Aufschließen von Hackschnitzeln erfolgt.
  2. Zusammensetzung nach Anspruch 1, wobei der Chelatbildner ein Übergangsmetallionenchelant ist, der aus der Liste ausgewählt ist, die aus Folgendem besteht:
    organischen Hydroxysäuren, Aminophosphonaten, Aminophosphaten, Aminocarboxylaten, Salzen von DTPA, Salzen von EDTA, Salzen von DTMPA und einer beliebigen Kombination davon.
  3. Zusammensetzung nach Anspruch 1, wobei die Zusammensetzung eine wässrige Lösung oder Aufschlämmung zur Verwendung in einem Bespritzen von Hackschnitzeln, Schlagen von Hackschnitzeln, Waschen von Hackschnitzeln oder zur Verwendung in einem Refiner oder einer Kombination davon ist.
  4. Zusammensetzung nach Anspruch 1, wobei die reduktive Chemikalie ferner Natriumhydrosulfit umfasst.
  5. Verwendung der Zusammensetzung nach Anspruch 1, um den Mahlgrad von Papier in einem Papierherstellungsvorgang zu verringern, wenn die Zusammensetzung spätestens dann hinzugefügt wird, wenn das mechanische Aufschließen von Hackschnitzeln erfolgt.
  6. Verfahren zum Verbessern eines mechanischen Aufschlussvorgangs, wobei das Verfahren Folgendes umfasst:
    Hinzufügen der Zusammensetzung nach Anspruch 1 zu dem Zellstoff vor dem Abschluss eines mechanischen Aufschlussvorgangs, wobei die Zusammensetzung den Mahlgrad des resultierenden Papierzellstoffs herabsetzt und die Helligkeit des resultierenden Papierzellstoffs erhöht.
  7. Verfahren nach Anspruch 6, wobei die Zusammensetzung eine wässrige Lösung oder Aufschlämmung ist, die geeignet ist, um gemäß einem Verfahren hinzugefügt zu werden, das aus Folgenden ausgewählt ist:
    Besprühen von Hackschnitzeln, Einweichen von Hackschnitzeln, Waschen von Hackschnitzeln, hinzugefügt in einem Refiner und einer beliebigen Kombination davon.
  8. Verfahren nach Anspruch 6, wobei die Zusammensetzung eine synergistische Mischung von Magnesiumhydroxid, Natriumhydrosulfitnatriumborhydrid, Natriumhydroxid und einem Chelant ist.
  9. Verfahren nach Anspruch 8, ferner umfassend den Schritt eines Kombinierens von Magnesiumhydroxid mit Natriumhydrosulfit in einem Refiner, der nach einem nachfolgenden Peroxid- oder Hydrosulfitbleichen einen helleren Holzschliff bewirkt.
  10. Verfahren nach Anspruch 6, wobei die Base nur Magnesiumhydroxid in einer Dosierung von 0,05-0,5 % ist.
EP10706889.2A 2009-03-09 2010-03-04 Verfahren und chemische zusammensetzung zur verbesserung der substanzausnutzung von holzstoff Active EP2406425B1 (de)

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US12/400,326 US20100224333A1 (en) 2009-03-09 2009-03-09 Method and chemical composition to improve efficiency of mechanical pulp
PCT/US2010/026148 WO2010104725A1 (en) 2009-03-09 2010-03-04 Method and chemical composition to improve efficiency of mechanical pulp

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EP2406425A1 EP2406425A1 (de) 2012-01-18
EP2406425B1 true EP2406425B1 (de) 2019-10-02

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US (1) US20100224333A1 (de)
EP (1) EP2406425B1 (de)
JP (1) JP5669762B2 (de)
KR (1) KR101718557B1 (de)
CN (1) CN102348848A (de)
BR (1) BRPI1009542B1 (de)
CA (1) CA2753944C (de)
RU (1) RU2530386C2 (de)
WO (1) WO2010104725A1 (de)

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BRPI1009542B1 (pt) 2020-06-02
KR101718557B1 (ko) 2017-03-21
BRPI1009542A2 (pt) 2016-03-22
EP2406425A1 (de) 2012-01-18
RU2011135609A (ru) 2013-04-20
CA2753944C (en) 2018-10-02
US20100224333A1 (en) 2010-09-09
CA2753944A1 (en) 2010-09-16
JP5669762B2 (ja) 2015-02-18
WO2010104725A1 (en) 2010-09-16
RU2530386C2 (ru) 2014-10-10
KR20110128915A (ko) 2011-11-30
JP2012519785A (ja) 2012-08-30

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