EP1243693A2 - Process for loading fibers from a fibrous suspension with an additive - Google Patents
Process for loading fibers from a fibrous suspension with an additive Download PDFInfo
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- EP1243693A2 EP1243693A2 EP02002736A EP02002736A EP1243693A2 EP 1243693 A2 EP1243693 A2 EP 1243693A2 EP 02002736 A EP02002736 A EP 02002736A EP 02002736 A EP02002736 A EP 02002736A EP 1243693 A2 EP1243693 A2 EP 1243693A2
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- Prior art keywords
- fiber
- suspension
- calcium
- fibers
- calcium hydroxide
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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
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
-
- 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
- the invention relates to a method for loading in a Fiber suspension containing fibers with an auxiliary.
- the pulp used for paper production which may consist in particular of recovered pulp, must first be prepared accordingly, whereby it is usually subjected, for example, to flotation, dispersion and bleaching in order to eliminate or comminute undesirable constituents such as printing inks and stickies, so that these are no longer visually perceptible and correspondingly better optical values are achieved.
- a bleaching process must be interposed in order to prevent the yellowing of the mechanically digested fibers or to bring the mechanically digested fibers to a higher degree of whiteness.
- fillers or fillers in particular calcium carbonate (CaCO 3 ), enables higher optical values to be achieved in the end product paper.
- the corresponding treatment has recently been carried out by a so-called "Fiber Loading TM" process, as described, for example, in US Pat. No. 5,223,090.
- a "Fiber Loading TM” process at least one additive, in particular filler, is attached to the wetted fiber surfaces of the fiber material.
- the fibers can be loaded with calcium carbonate, for example.
- calcium oxide and / or calcium hydroxide is added to the moist, disintegrated fiber material in such a way that at least a part thereof is associated with the water present in the fiber material.
- the fiber material treated in this way is then subjected to carbon dioxide (CO 2 ).
- the aim of the invention is to provide an improved method of the type mentioned specify with which in particular a yellowing of the mechanical Disrupted fibers prevented as a result of the "Fiber Loading TM" process or the hitherto usual bleaching process is at least partially unnecessary.
- This object is achieved according to the invention by a method for loading of fibers contained in a fiber suspension with an auxiliary a chemical precipitation reaction in which the fiber suspension before Triggering the precipitation reaction calcium hydroxide and / or calcium oxide and at least one bleach is added. It can be the Bleach act in particular peroxide.
- the calcium hydroxide and / or calcium oxide are preferably after the Dryness of the pulp suspension increasing press or after a Thicken the fiber suspension added.
- the advantage achieved here is especially in that losses in the upstream thickening process avoided and the filtrates are not contaminated with glue when thickening, which means that the filtrate of the thickening process has a low pH is ensured.
- This auxiliary can be in powder form or in Liquid form can be added.
- the process control and regulation simplified.
- the addition of quicklime and / or slaked lime to one Fiber suspension can raise the pH to a value of 12, which is what Filtrate is undesirable. In particular, this also results in a simpler one Process water management.
- the specified process is particularly also for fresh fibers and Fiber mixtures made from 100% mechanically digested fibers (ground wood pulp) applicable.
- the process is the calcium hydroxide and / or calcium oxide in powder form or in Liquid form with a solid mass concentration of 5% to 30% of the Fiber suspension added, the solid mass concentration of Fiber suspension is in the range of 20% to 35%.
- the calcium hydroxide and / or calcium oxide with the Fiber suspension mixed before the precipitation reaction is triggered.
- the peroxide is also preferably used before the precipitation reaction is triggered added.
- the pulp suspension can thus before the precipitation reaction is triggered especially calcium oxide (CaO, quicklime) can also be added.
- CaO calcium oxide
- quicklime quicklime
- carbon dioxide (CO 2 ) or a medium containing carbon dioxide is introduced into the fiber suspension to initiate the precipitation reaction, thereby ensuring that the starting materials calcium hydroxide or calcium oxide are converted into the reaction products calcium carbonate (CaCO 3 ) and water to load the fibers with the filler calcium carbonate in particular.
- calcium carbonate is thus deposited on the wetted fiber surfaces by adding calcium oxide and / or calcium hydroxide to the moist fiber material, at least some of which can be associated with the water in the amount of fiber.
- the fiber material treated in this way is then exposed to carbon dioxide.
- the calcium carbonate (CaCO 3 ) formed can form a suspension around and between the fibers.
- the term “wetted fiber surfaces” can include all wetted surfaces of the individual fibers. This also includes in particular the case in which the fibers are loaded with calcium carbonate both on their outer surface and in their interior (lumen).
- the fibers can be loaded with the filler calcium carbonate, the attachment to the wetted fiber surfaces by a so-called “Fiber Loading TM” process takes place, as it in US-A-5 223 090. This reacts in this "Fiber Loading TM” process Carbon dioxide with the calcium hydroxide to water and calcium carbonate.
- the method according to the invention is particularly useful for Fresh fibers and fiber mixtures made up of 100% mechanical open fibers can exist, applicable.
- the single figure of the drawing shows a simplified process diagram for an exemplary pretreatment of a fiber suspension, in particular for paper and / or cardboard manufacture, for loading the fibers with an auxiliary by a chemical precipitation reaction, the fiber suspension before the precipitation reaction triggers calcium hydroxide (Ca (OH) 2 , hydrated lime) and / or calcium oxide and after the addition of calcium hydroxide and / or calcium oxide (quicklime) at least one peroxide is added.
- Ca (OH) 2 calcium hydroxide
- hydrated lime hydrated lime
- calcium oxide calcium oxide
- the fibrous suspension is, for example, by dissolving pulp or Waste paper with aggregates generated in a pulper 10 and / or not dried pulp, also known as "never dried pulp", the Loading process, e.g. directly from a connected pulp mill Coming.
- the pulp suspension can e.g. in area 12 by dewatering using a Press can be thickened because a higher for the "Fiber Loading TM" process
- the pulp mass concentration is advantageous e.g. (20% to 35%).
- the pulp suspension 14 calcium hydroxide in a mixing container and optionally added calcium oxide in which the mixture in question then mixed.
- the Fibrous suspension After adding calcium hydroxide or calcium oxide, the Fibrous suspension at least one before triggering the precipitation reaction Peroxide added.
- the calcium hydroxide and / or calcium oxide can be the fiber suspension especially with a mass concentration of about 5% to about 30% be added, i.e. the mass fraction of calcium hydroxide and / or Calcium oxide on the total mass of the added suspension is 5 to 30 %.
- 16 carbon dioxide or a medium containing carbon dioxide is introduced into the pulp suspension in order to for a conversion of the starting materials calcium hydroxide or calcium oxide into the Reaction products to ensure calcium carbonate and water and thereby the Load fibers with the filler calcium carbonate.
- Calcium oxide and / or calcium hydroxide (slaked lime) is added to the fiber material in such a way that at least part of it can associate with the water present in the fiber material, ie between the fibers, in the hollow fibers and in their walls, the following chemical Response sets:
- the fiber material is then exposed to carbon dioxide (CO 2 ) or a medium containing carbon dioxide such that calcium carbonate (CaCO 3 ) is largely deposited on the wetted fiber surfaces.
- CO 2 carbon dioxide
- CaCO 3 calcium carbonate
- optical output values of the raw material are checked a "Fiber Loading TM" process using at least one peroxide increases, with yellowing of the mechanically disrupted fibers prevented or the previous upstream bleaching process partially or becomes superfluous.
- Glue or the so-called calcium hydroxide and / or calcium oxide is added after the press in powder or liquid form at a concentration of about 5% to about 30% of the fiber suspension at 20% to 35% concentration and mixed before the "Fiber Loading TM "Process is carried out.
- this has the advantage that losses in the upstream thickening process are avoided and filtrates are not contaminated with glue during thickening, which means that a low pH is ensured.
- the process control and regulation is simplified.
- there is also a simpler process water supply. This process can also be used with fresh fibers and fiber mixtures which consist of 100% mechanically disintegrated fibers.
- At least one peroxide is added, as a result of which higher optical values are achieved, ie the upstream bleaching process which has hitherto been customary and which prevents yellowing of the fibers can be partially or completely dispensed with.
- the yellowing of the fibers is avoided by the addition of peroxide, with bleaching also being carried out in one process step.
- the addition of the quick lime or calcium hydroxide enables this technologically combined process.
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit einem Hilfsstoff.The invention relates to a method for loading in a Fiber suspension containing fibers with an auxiliary.
Der zur Papierherstellung verwendete Stoff (Pulp), der insbesondere aus wiedergewonnenem Pulp bestehen kann, muß zunächst entsprechend aufbereitet werden, wobei er üblicherweise z.B. einer Flotation, Dispergierung und Bleichung unterworfen wird, um unerwünschte Bestandteile wie Druckfarben und Stickies zu eliminieren oder zu zerkleinern, so daß diese optisch nicht mehr wahrnehmbar sind und entsprechend bessere optische Werte erreicht werden. Bekanntlich muß ein Bleichprozeß zwischengeschaltet werden, um das Vergilben der mechanisch aufgeschlossenen Fasern zu verhindern oder die mechanisch aufgeschlossenen Fasern auf höhere Weißgrade zu bringen. Zudem ist auch allgemein bekannt, daß durch die Zugabe von Füllstoffen oder Fillern insbesondere Calciumcarbonat (CaCO3) beim Endprodukt Papier höhere optische Werte erreicht werden können.The pulp used for paper production, which may consist in particular of recovered pulp, must first be prepared accordingly, whereby it is usually subjected, for example, to flotation, dispersion and bleaching in order to eliminate or comminute undesirable constituents such as printing inks and stickies, so that these are no longer visually perceptible and correspondingly better optical values are achieved. As is known, a bleaching process must be interposed in order to prevent the yellowing of the mechanically digested fibers or to bring the mechanically digested fibers to a higher degree of whiteness. In addition, it is also generally known that the addition of fillers or fillers, in particular calcium carbonate (CaCO 3 ), enables higher optical values to be achieved in the end product paper.
Um eine möglichst starke Bindung der Füllstoffe an die Faseroberfläche zu erreichen, erfolgt die entsprechende Behandlung in jüngster Zeit durch einen sogenannten "Fiber Loading™"-Prozeß, wie er beispielsweise in der US-A-5 223 090 beschrieben ist. Bei einem solchen "Fiber Loading™"-Prozeß wird an die benetzten Faseroberflächen des Fasermaterials wenigstens ein Zusatzstoff, insbesondere Füllstoff, angelagert. Dabei können die Fasern beispielsweise mit Calciumcarbonat beladen werden. Hierzu wird dem feuchten, desintegrierten Fasermaterial Calciumoxid und/oder Calciumhydroxid so zugesetzt, daß zumindest ein Teil davon sich mit dem im Fasermaterial vorhandenen Wasser assoziiert. Das so behandelte Fasermaterial wird anschließend mit Kohlendioxid (CO2) beaufschlagt.In order to achieve the strongest possible binding of the fillers to the fiber surface, the corresponding treatment has recently been carried out by a so-called "Fiber Loading ™" process, as described, for example, in US Pat. No. 5,223,090. In such a "Fiber Loading ™" process, at least one additive, in particular filler, is attached to the wetted fiber surfaces of the fiber material. The fibers can be loaded with calcium carbonate, for example. For this purpose, calcium oxide and / or calcium hydroxide is added to the moist, disintegrated fiber material in such a way that at least a part thereof is associated with the water present in the fiber material. The fiber material treated in this way is then subjected to carbon dioxide (CO 2 ).
Ziel der Erfindung ist es, ein verbessertes Verfahren der eingangs genannten Art anzugeben, mit dem insbesondere ein Vergilben der mechanisch aufgeschlossenen Fasern infolge des "Fiber Loading™"-Prozesses verhindert bzw. der bisher übliche Bleichprozeß zumindest teilweise entbehrlich wird.The aim of the invention is to provide an improved method of the type mentioned specify with which in particular a yellowing of the mechanical Disrupted fibers prevented as a result of the "Fiber Loading ™" process or the hitherto usual bleaching process is at least partially unnecessary.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit einem Hilfsstoff durch eine chemische Fällungsreaktion, bei dem der Faserstoffsuspension vor der Auslösung der Fällungsreaktion Calciumhydroxid und/oder Calciumoxid und mindestens ein Bleichmittel zugesetzt wird. Dabei kann es sich bei dem Bleichmittel insbesondere um Peroxid handeln.This object is achieved according to the invention by a method for loading of fibers contained in a fiber suspension with an auxiliary a chemical precipitation reaction in which the fiber suspension before Triggering the precipitation reaction calcium hydroxide and / or calcium oxide and at least one bleach is added. It can be the Bleach act in particular peroxide.
Aufgrund dieser Ausbildung erhält man durch einen "Fiber Loading™"-Prozeß unter Verwendung wenigstens eines Peroxids erhöhte optische Werte des Ausgangsrohstoffes, wobei das Vergilben der mechanisch aufgeschlossenen Fasern verhindert bzw. der bisher übliche Bleichprozeß teilweise oder ganz entbehrlich wird.Because of this training, you get through a "Fiber Loading ™" process using at least one peroxide increased optical values of the Starting raw material, the yellowing of the mechanically digested Prevents fibers or the bleaching process that has been usual up to now partially or completely becomes dispensable.
Das Calciumhydroxid und/oder Calciumoxid werden vorzugsweise nach einer den Trockengehalt der Faserstoffsuspension erhöhenden Presse bzw. nach einem Eindicken der Faserstoffsuspension zugesetzt. Der hierbei erzielte Vorteil besteht insbesondere darin, daß Verluste bei dem vorgeschalteten Eindickungsprozeß vermieden und die Filtrate beim Eindicken nicht mit Leim kontaminiert werden, was bedeutet, daß für die Filtrate des Eindickungsprozesses ein niedriger pH-Wert sichergestellt ist. Dabei kann dieser Hilfsstoff in Pulverform oder in Flüssigform zugesetzt werden. Überdies wird die Prozeßführung und Regelung vereinfacht. Die Zugabe von Branntkalk und/oder gelöschtem Kalk zu einer Fasersuspension kann den pH-Wert bis auf den Wert 12 erhöhen, was für das Filtrat unerwünscht ist. Dabei ergibt sich insbesondere auch eine einfachere Prozeßwasserführung.The calcium hydroxide and / or calcium oxide are preferably after the Dryness of the pulp suspension increasing press or after a Thicken the fiber suspension added. The advantage achieved here is especially in that losses in the upstream thickening process avoided and the filtrates are not contaminated with glue when thickening, which means that the filtrate of the thickening process has a low pH is ensured. This auxiliary can be in powder form or in Liquid form can be added. In addition, the process control and regulation simplified. The addition of quicklime and / or slaked lime to one Fiber suspension can raise the pH to a value of 12, which is what Filtrate is undesirable. In particular, this also results in a simpler one Process water management.
Der angegebene Prozeß ist insbesondere auch bei Frischfasern und Fasergemischen aus 100 % mechanisch aufgeschlossenen Fasern (ground wood pulp) anwendbar.The specified process is particularly also for fresh fibers and Fiber mixtures made from 100% mechanically digested fibers (ground wood pulp) applicable.
Gemäß einer zweckmäßigen praktischen Ausgestaltung des erfindungsgemäßen Verfahrens wird das Calciumhydroxid und/oder Calciumoxid in Pulverform oder in Flüssigform mit einer Feststoffmassenkonzentration von 5 % bis 30 % der Fasersuspension zugesetzt, wobei die Feststoffmassenkonzentration der Fasersuspension im Bereich von 20 % bis 35 % liegt.According to an expedient practical embodiment of the invention The process is the calcium hydroxide and / or calcium oxide in powder form or in Liquid form with a solid mass concentration of 5% to 30% of the Fiber suspension added, the solid mass concentration of Fiber suspension is in the range of 20% to 35%.
Vorzugsweise werden das Calciumhydroxid und/oder Calciumoxid mit der Faserstoffsuspension vermischt, bevor die Fällungsreaktion ausgelöst wird. Auch das Peroxid wird vorzugsweise vor der Auslösung der Fällungsreaktion zugesetzt.Preferably, the calcium hydroxide and / or calcium oxide with the Fiber suspension mixed before the precipitation reaction is triggered. The peroxide is also preferably used before the precipitation reaction is triggered added.
Indem das Peroxid nach der Leimzugabe bzw. der Zugabe von Calciumhydroxid und/oder Calciumoxid zugesetzt wird, werden höhere optische Werte erreicht, was bedeutet, daß der in der Stoffaufbereitung üblicherweise vorgesehene vorgeschaltete Bleichprozeß, der das Vergilben der Fasern unterbindet, teilweise oder auch ganz entfallen kann. Durch die Zugabe von Peroxid wird das durch den hohen pH-Wert des Leimes bedingte Vergilben der Fasern unterbunden und zusätzlich eine Bleiche in einem Prozeßschritt durchgeführt. Dieser technologisch kombinierte Prozeß ist in Verbindung mit der Zuführung von Calciumoxid (CaO, gebrannter Kalk) oder Calciumhydroxid (Ca(OH)2, Löschkalk) von entscheidendem Vorteil. By adding the peroxide after the addition of glue or the addition of calcium hydroxide and / or calcium oxide, higher optical values are achieved, which means that the upstream bleaching process usually provided in stock preparation, which prevents the yellowing of the fibers, is partially or completely eliminated can. By adding peroxide, the yellowing of the fibers due to the high pH value of the glue is prevented and bleaching is additionally carried out in one process step. This technologically combined process is of decisive advantage in connection with the addition of calcium oxide (CaO, quicklime) or calcium hydroxide (Ca (OH) 2 , hydrated lime).
Der Faserstoffsuspension kann vor der Auslösung der Fällungsreaktion somit insbesondere auch Calciumoxid (CaO, gebrannter Kalk) zugesetzt werden.The pulp suspension can thus before the precipitation reaction is triggered especially calcium oxide (CaO, quicklime) can also be added.
Gemäß einer bevorzugten praktischen Ausgestaltung des erfindungsgemäßen Verfahren wird zur Auslösung der Fällungsreaktion Kohlendioxid (CO2) bzw. ein Kohlendioxid enthaltendes Medium in die Faserstoffsuspension eingeleitet und dadurch für eine Umsetzung der Ausgangsstoffe Calciumhydroxid bzw. Calciumoxid in die Reaktionsprodukte Calciumcarbonat (CaCO3) und Wasser gesorgt, um die Fasern insbesondere mit dem Füllstoff Calciumcarbonat zu beladen.According to a preferred practical embodiment of the method according to the invention, carbon dioxide (CO 2 ) or a medium containing carbon dioxide is introduced into the fiber suspension to initiate the precipitation reaction, thereby ensuring that the starting materials calcium hydroxide or calcium oxide are converted into the reaction products calcium carbonate (CaCO 3 ) and water to load the fibers with the filler calcium carbonate in particular.
Bei dem Beladen der Fasern wird hier also Calciumcarbonat an die benetzten Faseroberflächen eingelagert, indem dem feuchten Fasermaterial Calciumoxid und/oder Calciumhydroxid zugesetzt wird, wobei zumindest ein Teil davon sich mit dem Wasser der Faserstoffmenge assoziieren kann. Das so behandelte Fasermaterial wird dann mit Kohlendioxid beaufschlagt. Überdies kann das entstandene Calciumcarbonat (CaCO3) um und zwischen den Fasern eine Suspension bilden. Dabei kann der Begriff "benetzte Faseroberflächen" alle benetzten Oberflächen der einzelnen Fasern umfassen. Damit ist insbesondere auch der Fall mit erfaßt, bei dem die Fasern sowohl an ihrer Außenfläche als auch in ihrem Innern (Lumen) mit Calciumcarbonat beladen werden.When the fibers are loaded, calcium carbonate is thus deposited on the wetted fiber surfaces by adding calcium oxide and / or calcium hydroxide to the moist fiber material, at least some of which can be associated with the water in the amount of fiber. The fiber material treated in this way is then exposed to carbon dioxide. In addition, the calcium carbonate (CaCO 3 ) formed can form a suspension around and between the fibers. The term “wetted fiber surfaces” can include all wetted surfaces of the individual fibers. This also includes in particular the case in which the fibers are loaded with calcium carbonate both on their outer surface and in their interior (lumen).
Demnach könne die Fasern mit dem Füllstoff Calciumcarbonat beladen werden, wobei die Anlagerung an die benetzten Faseroberflächen durch einen sogenannten "Fiber Loading™"-Prozeß erfolgt, wir er als solcher in der US-A-5 223 090 beschrieben ist. In diesem "Fiber Loading™"-Prozeß reagiert das Kohlendioxid mit dem Calciumhydroxid zu Wasser und Calciumcarbonat.Accordingly, the fibers can be loaded with the filler calcium carbonate, the attachment to the wetted fiber surfaces by a so-called "Fiber Loading ™" process takes place, as it in US-A-5 223 090. This reacts in this "Fiber Loading ™" process Carbon dioxide with the calcium hydroxide to water and calcium carbonate.
Auch im übrigen kann bei dem Beladen der Fasern mit Calciumcarbonat insbesondere so vorgegangen werden, wie dies in der US-A-5 223 090 beschrieben ist. Der Inhalt dieser Druckschrift wird hiermit durch Bezugnahme in die vorliegende Anmeldung mit aufgenommen.Otherwise, when loading the fibers with calcium carbonate in particular, be carried out as in US-A-5 223 090 is described. The content of this document is hereby incorporated by reference in the present application included.
Wie bereits erwähnt ist das erfindungsgemäße Verfahren insbesondere bei Frischfasern und bei Fasergemischen, die aus bis zu 100 % mechanisch aufgeschlossenen Fasern bestehen können, anwendbar.As already mentioned, the method according to the invention is particularly useful for Fresh fibers and fiber mixtures made up of 100% mechanical open fibers can exist, applicable.
Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiel unter Bezugnahme auf die Zeichnung näher erläutert.The invention is described below using an exemplary embodiment Reference to the drawing explained in more detail.
Die einzige Figur der Zeichnung zeigt ein vereinfachtes Prozeßdiagramm für eine beispielhafte Vorbehandlung einer insbesondere der Papier- und/oder Kartonherstellung dienenden Faserstoffsuspension zum Beladen der Fasern mit einem Hilfsstoff durch eine chemische Fällungsreaktion, wobei der Faserstoffsuspension vor der Auslösung der Fällungsreaktion Calciumhydroxid (Ca(OH)2, Löschkalk) und/oder Calciumoxid und nach dem Zusetzen von Calciumhydroxid und/oder Calciumoxid (gebrannter Kalk) wenigstens ein Peroxid zugesetzt wird.The single figure of the drawing shows a simplified process diagram for an exemplary pretreatment of a fiber suspension, in particular for paper and / or cardboard manufacture, for loading the fibers with an auxiliary by a chemical precipitation reaction, the fiber suspension before the precipitation reaction triggers calcium hydroxide (Ca (OH) 2 , hydrated lime) and / or calcium oxide and after the addition of calcium hydroxide and / or calcium oxide (quicklime) at least one peroxide is added.
Die Faserstoffsuspension wird beispielsweise durch Auflösen von Zellstoff oder
Altpapier mit Zuschlagstoffen in einem Stofflöser 10 erzeugt und/oder aus nicht
getrocknetem Faserstoff, der auch als "never dried pulp" bezeichnet wird, dem
Beladungsprozeß zugeführt, z.B. direkt aus einer angeschlossenen Zellstoffabrik
kommend.The fibrous suspension is, for example, by dissolving pulp or
Waste paper with aggregates generated in a
Die Faserstoffsuspension kann z.B. im Bereich 12 durch Entwässern mittels einer
Presse eingedickt werden, da für den "Fiber Loading™"-Prozeß eine höhere
Faserstoffmassenkonzentration vorteilhaft ist z.B. (20 % bis 35 %). The pulp suspension can e.g. in
Der Faserstoffsuspension werden in einem Mischbehälter 14 Calciumhydroxid
und gegebenenfalls Calciumoxid zugegeben, in dem das betreffende Gemisch
dann durchgemischt wird.The
Nach dem Zusetzten von Calciumhydroxid bzw. Calciumoxid wird der Faserstoffsuspension noch vor dem Auslösen der Fällungsreaktion wenigstens ein Peroxid zugesetzt.After adding calcium hydroxide or calcium oxide, the Fibrous suspension at least one before triggering the precipitation reaction Peroxide added.
Das Calciumhydroxid und/oder Calciumoxid kann der Faserstoffsuspension insbesondere mit einer Massenkonzentration von etwa 5 % bis etwa 30 % zugesetzt werden, d.h. der Massenanteil des Calciumhydroxids und/oder des Calciumoxids an der Gesamtmasse der zugesetzten Suspension beträgt 5 bis 30 %.The calcium hydroxide and / or calcium oxide can be the fiber suspension especially with a mass concentration of about 5% to about 30% be added, i.e. the mass fraction of calcium hydroxide and / or Calcium oxide on the total mass of the added suspension is 5 to 30 %.
Zur Auslösung der Fällungsreaktion wird in einem Reaktor 16 Kohlendioxid bzw. ein Kohlendioxid enthaltendes Medium in die Faserstoffsuspension eingeleitet, um für eine Umsetzung der Ausgangsstoffe Calciumhydroxid bzw. Calciumoxid in die Reaktionsprodukte Calciumcarbonat und Wasser zu sorgen und dadurch die Fasern mit dem Füllstoff Calciumcarbonat zu beladen.To trigger the precipitation reaction, 16 carbon dioxide or a medium containing carbon dioxide is introduced into the pulp suspension in order to for a conversion of the starting materials calcium hydroxide or calcium oxide into the Reaction products to ensure calcium carbonate and water and thereby the Load fibers with the filler calcium carbonate.
Dem Fasermaterial wird also Calciumoxid und/oder Calciumhydroxid (gelöschter
Kalk) so zugesetzt, daß zumindest ein Teil davon sich mit dem im Fasermaterial,
d.h. zwischen den Fasern, in den Hohlfasern und in ihren Wänden, vorhandenen
Wasser assoziieren kann, wobei sich die folgende chemische Reaktion einstellt:
Überdies wird, wie bereits erwähnt, Calciumhydroxid (Ca(OH)2, Löschkalk) und/oder Calciumoxid (gebrannter Kalk) zugesetzt. In addition, as already mentioned, calcium hydroxide (Ca (OH) 2 , hydrated lime) and / or calcium oxide (quicklime) is added.
In dem Reaktor 16 wird das Fasermaterial dann derart mit Kohlendioxid (CO2)
bzw. einem Kohlendioxid enthaltenden Medium beaufschlagt, daß
Calciumcarbonat (CaCO3) an die benetzten Faseroberflächen weitestgehend
angelagert wird. Dabei stellt sich folgende chemische Reaktion ein:In the
Demnach werden die optischen Ausgangswerte der Ausgangsrohstoffes durch einen "Fiber Loading™"-Prozeß unter Verwendung von wenigstens einem Peroxid erhöht, wobei eine Vergilbung der mechanisch aufgeschlossenen Fasern unterbunden bzw. der bisher übliche vorgeschaltete Bleichprozeß teilweise oder ganz entbehrlich wird.Accordingly, the optical output values of the raw material are checked a "Fiber Loading ™" process using at least one peroxide increases, with yellowing of the mechanically disrupted fibers prevented or the previous upstream bleaching process partially or becomes superfluous.
Dabei wird Leim bzw. das sogenannte Calciumhydroxid und/oder Calciumoxid
nach der Presse in Pulverform oder in Flüssigform mit einer Konzentration von
etwa 5 % bis etwa 30 % der Faserstoffsuspension bei 20 % bis 35 %
Konzentration zugesetzt und vermischt, bevor der "Fiber Loading™"-Prozeß
durchgeführt wird. Dies bringt unter anderem den Vorteil mit sich, daß Verluste bei
dem vorgeschalteten Eindickungsprozeß vermieden und Filtrate beim Eindicken
nicht mit Leim kontaminiert werden, was bedeutet, daß ein niedriger pH-Wert
sichergestellt ist. Zudem wird die Prozeßführung und die Regelung vereinfacht.
Darüber hinaus ergibt sich auch eine einfachere Prozeßwasserführung. Dieser
Prozeß ist auch anwendbar bei Frischfasern und Fasergemischen, die aus 100 %
mechanisch aufgeschlossenen Fasern bestehen.
Nach der Leimzugabe wird wenigstens ein Peroxid zugesetzt, wodurch höhere
optische Werte erreicht werden, d.h. der bisher übliche vorgeschaltete
Bleichprozeß, der das Vergilben der Fasern unterbindet, teilweise oder ganz
entfallen kann. Das Vergilben der Fasern wird durch die Zugabe von Peroxid
vermieden, wobei zusätzlich eine Bleiche in einem Prozeßschritt durchgeführt
wird. Die Zuführung des Brandkalkes oder Calciumhydroxides ermöglicht diesen
technologisch kombinierten Prozeß. Glue or the so-called calcium hydroxide and / or calcium oxide is added after the press in powder or liquid form at a concentration of about 5% to about 30% of the fiber suspension at 20% to 35% concentration and mixed before the "Fiber Loading ™ "Process is carried out. Among other things, this has the advantage that losses in the upstream thickening process are avoided and filtrates are not contaminated with glue during thickening, which means that a low pH is ensured. In addition, the process control and regulation is simplified. In addition, there is also a simpler process water supply. This process can also be used with fresh fibers and fiber mixtures which consist of 100% mechanically disintegrated fibers.
After the glue has been added, at least one peroxide is added, as a result of which higher optical values are achieved, ie the upstream bleaching process which has hitherto been customary and which prevents yellowing of the fibers can be partially or completely dispensed with. The yellowing of the fibers is avoided by the addition of peroxide, with bleaching also being carried out in one process step. The addition of the quick lime or calcium hydroxide enables this technologically combined process.
- 1010
- Stofflöserpulper
- 1212
- Eindickung, PresseThickening, press
- 1414
- Mischbehältermixing tank
- 1616
- Reaktorreactor
Claims (12)
dadurch gekennzeichnet, daß die Faserstoffsuspension vor dem Zusetzen von Calciumhydroxid und/oder Calciumoxid eingedickt wird.Method according to claim 1,
characterized in that the fiber suspension is thickened before adding calcium hydroxide and / or calcium oxide.
dadurch gekennzeichnet, daß das Bleichmittel Peroxid ist.The method of claim 1 or 2,
characterized in that the bleaching agent is peroxide.
dadurch gekennzeichnet, daß das Bleichmittel aus einer Kombination aus Peroxid und Ozon besteht.Method according to one of the preceding claims,
characterized in that the bleaching agent consists of a combination of peroxide and ozone.
dadurch gekennzeichnet, daß der Faserstoffsuspension das Peroxid nach dem Zusetzen von Calciumhydroxid und/oder Calciumoxid zugesetzt wird.Method according to one of the preceding claims,
characterized in that the peroxide is added to the fibrous suspension after the addition of calcium hydroxide and / or calcium oxide.
dadurch gekennzeichnet, daß das Calciumhydroxid und/oder Calciumoxid nach einer den Trockengehalt der Faserstoffsuspension erhöhenden Presse (12) bzw. nach einem Eindicken der Faserstoffsuspension zugesetzt werden.Method according to one of the preceding claims,
characterized in that the calcium hydroxide and / or calcium oxide are added after a press (12) which increases the dry content of the fibrous suspension or after the fibrous suspension has thickened.
dadurch gekennzeichnet, daß das Calciumhydroxid und/oder Calciumoxid in Pulverform oder in Flüssigform mit einer Feststoffmassenkonzentration von etwa 5 % bis etwa 30 % der Fasersuspension zugesetzt wird, wobei die Feststoffkonzentration der Fasersuspension vorzugsweise im Bereich von etwa 20 % bis etwa 35 % liegt.Method according to one of the preceding claims,
characterized in that the calcium hydroxide and / or calcium oxide is added in powder form or in liquid form with a solids mass concentration of about 5% to about 30% of the fiber suspension, the solids concentration of the fiber suspension preferably being in the range of about 20% to about 35%.
dadurch gekennzeichnet, daß das Calciumhydroxid und/oder Calciumoxid mit der Faserstoffsuspension vermischt werden, bevor die Fällungsreaktion ausgelöst wird.Method according to one of the preceding claims,
characterized in that the calcium hydroxide and / or calcium oxide are mixed with the fiber suspension before the precipitation reaction is triggered.
dadurch gekennzeichnet, daß das Peroxid vor der Auslösung der Fällungsreaktion zugesetzt wird.Method according to one of the preceding claims,
characterized in that the peroxide is added before the precipitation reaction is triggered.
dadurch gekennzeichnet, daß zur Auslösung der Fällungsreaktion Kohlendioxid in die Faserstoffsuspension eingeleitet und dadurch für eine Umsetzung der Ausgangsstoffe Calciumhydroxid bzw. Calciumoxid in die Reaktionsprodukte Calciumcarbonat und Wasser gesorgt wird, um die Fasern mit dem Füllstoff Calciumcarbonat zu beladen.Method according to one of the preceding claims,
characterized in that to initiate the precipitation reaction, carbon dioxide is introduced into the fiber suspension, thereby ensuring that the starting materials calcium hydroxide or calcium oxide are converted into the reaction products calcium carbonate and water in order to load the fibers with the filler calcium carbonate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10113998 | 2001-03-22 | ||
| DE10113998A DE10113998A1 (en) | 2001-03-22 | 2001-03-22 | Method for loading fibers contained in a fiber suspension with an auxiliary |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1243693A2 true EP1243693A2 (en) | 2002-09-25 |
| EP1243693A3 EP1243693A3 (en) | 2003-12-10 |
| EP1243693B1 EP1243693B1 (en) | 2006-04-26 |
Family
ID=7678539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02002736A Expired - Lifetime EP1243693B1 (en) | 2001-03-22 | 2002-02-07 | Process for loading fibers from a fibrous suspension with an additive |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1243693B1 (en) |
| AT (1) | ATE324484T1 (en) |
| DE (2) | DE10113998A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2781651A1 (en) | 2013-03-18 | 2014-09-24 | Linde Aktiengesellschaft | Process for fiber loading |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10317722A1 (en) * | 2003-04-17 | 2004-11-11 | Voith Paper Patent Gmbh | Introducing calcium carbonate into cellulosic fiber suspension, adds calcium hydroxide, de-waters and injects carbon dioxide to precipitate carbonate in moist suspension |
| DE10335751A1 (en) * | 2003-08-05 | 2005-03-03 | Voith Paper Patent Gmbh | Method for loading a pulp suspension and arrangement for carrying out the method |
| DE10351292A1 (en) * | 2003-10-31 | 2006-02-02 | Voith Paper Patent Gmbh | Method for loading a pulp suspension and arrangement for carrying out the method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5223090A (en) * | 1991-03-06 | 1993-06-29 | The United States Of America As Represented By The Secretary Of Agriculture | Method for fiber loading a chemical compound |
| WO1997001670A1 (en) * | 1995-06-29 | 1997-01-16 | Metsä-Serla Oy | Filler for use in paper manufacture and procedure for producing a filler |
| WO1998035095A1 (en) * | 1997-02-11 | 1998-08-13 | Minerals Technologies Inc. | Lumen loading of mineral filler into cellulose fibers for papermaking |
| WO1999055964A1 (en) * | 1998-04-27 | 1999-11-04 | Akzo Nobel N.V. | A process for the production of paper |
| WO2001004415A1 (en) * | 1999-07-09 | 2001-01-18 | Linde Gas Ag | Method for eliminating detrimental substances in a process liquid |
| EP1076132A1 (en) * | 1999-08-13 | 2001-02-14 | Fort James France | Process for fixing of mineral filler on cellulosic fibres and paper manufacturing process |
| WO2002000999A1 (en) * | 2000-06-27 | 2002-01-03 | International Paper Company | Method to manufacture paper using fiber filler complexes |
-
2001
- 2001-03-22 DE DE10113998A patent/DE10113998A1/en not_active Withdrawn
-
2002
- 2002-02-07 EP EP02002736A patent/EP1243693B1/en not_active Expired - Lifetime
- 2002-02-07 AT AT02002736T patent/ATE324484T1/en not_active IP Right Cessation
- 2002-02-07 DE DE50206517T patent/DE50206517D1/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5223090A (en) * | 1991-03-06 | 1993-06-29 | The United States Of America As Represented By The Secretary Of Agriculture | Method for fiber loading a chemical compound |
| WO1997001670A1 (en) * | 1995-06-29 | 1997-01-16 | Metsä-Serla Oy | Filler for use in paper manufacture and procedure for producing a filler |
| WO1998035095A1 (en) * | 1997-02-11 | 1998-08-13 | Minerals Technologies Inc. | Lumen loading of mineral filler into cellulose fibers for papermaking |
| WO1999055964A1 (en) * | 1998-04-27 | 1999-11-04 | Akzo Nobel N.V. | A process for the production of paper |
| WO2001004415A1 (en) * | 1999-07-09 | 2001-01-18 | Linde Gas Ag | Method for eliminating detrimental substances in a process liquid |
| EP1076132A1 (en) * | 1999-08-13 | 2001-02-14 | Fort James France | Process for fixing of mineral filler on cellulosic fibres and paper manufacturing process |
| WO2002000999A1 (en) * | 2000-06-27 | 2002-01-03 | International Paper Company | Method to manufacture paper using fiber filler complexes |
Non-Patent Citations (1)
| Title |
|---|
| J.H.KLUNGNESS ET AL: "Effect of fiber loading on paper properties" TAPPI JOURNAL, Bd. 79, Nr. 3, 1996, Seiten 297-301, XP001152897 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2781651A1 (en) | 2013-03-18 | 2014-09-24 | Linde Aktiengesellschaft | Process for fiber loading |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50206517D1 (en) | 2006-06-01 |
| EP1243693B1 (en) | 2006-04-26 |
| ATE324484T1 (en) | 2006-05-15 |
| DE10113998A1 (en) | 2002-09-26 |
| EP1243693A3 (en) | 2003-12-10 |
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