WO2008128595A1 - Procédé de formation de matières fibreuses, notamment de carbonate de calcium dans une suspension de matière fibreuse - Google Patents

Procédé de formation de matières fibreuses, notamment de carbonate de calcium dans une suspension de matière fibreuse Download PDF

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Publication number
WO2008128595A1
WO2008128595A1 PCT/EP2008/001389 EP2008001389W WO2008128595A1 WO 2008128595 A1 WO2008128595 A1 WO 2008128595A1 EP 2008001389 W EP2008001389 W EP 2008001389W WO 2008128595 A1 WO2008128595 A1 WO 2008128595A1
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WO
WIPO (PCT)
Prior art keywords
reactor
pulp
consistency
operated
calcium carbonate
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2008/001389
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German (de)
English (en)
Inventor
Uwe Brand
Christian Naydowski
Stefan Scholl
Johannes Trummer
Andreas Arnhold
Ingo Kauer
Christian Steinmassl
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Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of WO2008128595A1 publication Critical patent/WO2008128595A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • US 5,223,090 discloses a process employing fibrous material having elongated fibers with a cell wall surrounding a cavity, the fibers having a humidity sufficient to form a dewatered pulp slurry.
  • the fibers have a moisture content corresponding to a proportion of 40 to 50% of the weight of the fibers.
  • the water is essentially present inside the fibers and inside the fiber walls.
  • calcium oxide or calcium hydroxide is added to the pulp so that at least part of the incorporated calcium oxide or calcium hydroxide is associated with the water present in the pulp.
  • the fibrous cellulosic material is combined with carbon dioxide while simultaneously subjected to a shear mixing process to form a fibrous material having a considerable amount of calcium carbonate on the fiber surface in the hollow interior and within the fiber walls of the cellulose fibers.
  • a method for loading a waste paper suspension which serves in particular to increase the whiteness of the - deinked or non-deinked - waste paper.
  • a waste paper suspension is preferably introduced at a consistency of between 0.1 and 5% in a gas / liquid reactor. Downstream of this insertion then takes place the supply of a basic salt-containing liquid, in particular of calcium hydroxide, wherein the thus mixed components with a reaction gas, in particular carbon dioxide, are brought into contact, thereby precipitating the filler.
  • the thus loaded waste paper suspension is then used for paper or board production.
  • a particularly suitable gas / liquid reactor a mixing container is proposed in which gas bubbles are distributed in a liquid. Apparently, an unusually high degree of filling of the pulp (filler content several hundred percent of the fiber weight) is required to achieve the desired whiteness.
  • a further method for loading a pulp suspension comprises the following steps: introduction of calcium hydroxide in liquid or dry form or of calcium oxide into the pulp suspension, thickening and heating of the pulp suspension, feeding of gaseous carbon dioxide in a crystallizer, precipitation of calcium carbonate by the carbon dioxide.
  • Fiber loaded with calcium carbonate fiber loaded precipitate calcium carbonate
  • the field of application of the invention extends to paper and pulp production and process technology, including the filler produced, and includes fields of application of all types of paper, including those resulting from their production, which have a filler content between 1% and 60%.
  • the filler content may be between 5% and 50%.
  • Loading has a positive effect on the processes in stock preparation, paper machine and / or further processing.
  • a paper web made of loaded fibers is easier to dewater, for which reason e.g. the machine speed can be increased and / or the press section can be operated with a lower pressing pressure.
  • a further advantage of the use of the technology according to the invention in the paper grades listed above is that they can also be further processed without problems in a calender.
  • this paper is compared with conventionally produced papers, the same and / or higher filler contents show higher and / or equal strengths, porosity and specific volume (which may also be targeted) can be set lower), opacity and printability.
  • this type of fiber loading can increase the productivity of the paper machine and / or make its production more cost-effective (through, for example, raw material energy cost reduction).
  • the production of calcium carbonate in special crystal forms can be realized, i. So be optimally matched to the intended use of the paper or cardboard produced from it later.
  • the calcium carbonate produced under these conditions tends to crystallize largely as a skaleoneder, thus has the form of elongated crystals.
  • Another advantage of the relatively low consistency is the easier penetration of the reactants into the fiber interior (lumen). As a result, more calcium carbonate can also be produced in the fibers (lumen loading).
  • a particularly advantageous embodiment of the method is the combination of several reactors, each of which is operated with different consistency. If, for example, a reactor operated at a lower consistency is preceded by a further one in which a higher consistency, for example 6% to 30%, is used, the reaction can proceed in such a way that preferably crystals which have the form of rhombohedra form, ie rather are compact. After passing through both reactors is then a particularly effectively loaded pulp for the paper or Cartonboard production.
  • the order mentioned, ie first higher then lower consistency has procedural advantages, since less has to be thickened. But it may also be that, for reasons related to the optimal formation of fillers, the reverse is true. In other cases, it may be useful to divide the pulp stream and process the streams with different consistency, ie, not the two reactors but one after the other to switch in parallel.
  • the starting material for the loading process is an aqueous wetted pulp material, in particular pulp material with 0.1 to 30% consistency. This is registered in at least one reactor.
  • the addition of gaseous or dissolved carbon dioxide forms calcium carbonate.
  • calcium hydroxide or calcium oxide in aqueous and / or solid form may also be mixed into the reactor, e.g. be sprayed as lime milk.
  • the substance added to the first reactor already contains calcium hydroxide or calcium oxide, which was added in the material dissolving system, a receiver chest and / or in a static mixer, in particular a pH in the range between 5 and 12 was set.
  • the process temperature is between generation of the calcium carbonate + 15 0 C and 130 ° C, in particular between 20 ° and 60 ° C.
  • the formation of the calcium carbonate is preferably carried out in a pressure range between 0.1 and 6 bar, in particular between 1 and 4 bar. There are also higher pressures, eg up to 20 bar possible.
  • the average residence time of the substance in the reactor is between 60 seconds and 15 minutes, in particular between 5 and 10 minutes.
  • the solids concentration of the pulp suspension provided for reaction with carbon dioxide is selected in a range from about 0.1 to about 40% and preferably in a range from about 0.5 to 30%.
  • crystals of a rhombohedral shape having a grain size fraction in a range of about 0.02 to about 5 ⁇ m may be produced.
  • Fig. 1 is a plant diagram for illustrating the method according to the invention
  • Fig. 2 system diagram for a process with two reactors, connected in series
  • Fig. 3 system diagram for a method with two reactors, connected in parallel.
  • a pulper 10 for the unloaded pulp suspension 1, mixing device, in particular feed tank 2, lime leaching device 3, reactor 5, CO 2 supply device 16, optional CO 2 heater 17, press water tank 8.
  • a favorable embodiment of the method according to the invention is illustrated by means of a plant scheme.
  • a pulp suspension 1 is formed in the pulper 10, which then passes into a feed tank 2 in which it is mixed with calcium hydroxide liquid or dry, for example, as here in the form of lime (MOL).
  • MOL calcium hydroxide liquid or dry
  • the pulp suspension is then passed with a consistency between 0.1 and 6% in a reactor 5, in the gaseous carbon dioxide CO 2 is added. It is provided here in a CO 2 supply device 16, wherein it is also possible to heat it in a CO 2 heater 17.
  • a suitable reactor 5 is for example a closed container provided with a stirrer 27. Due to the movements of the contents, the reactants can easily come into contact.
  • the loaded pulp then passes into a finishing unit, e.g. a storage tank 13.
  • a finishing unit e.g. a storage tank 13.
  • a pulper 10 in particular HC pulper (high consistency pulper) for the unloaded pulp suspension 1, mixing device, in particular feed tank 2, lime lapping device 3, press 4, in particular screw press or screen press, a reactor 5, a reactor 6, CO 2 supply device 16 , optional CO 2 heater 17, press water tank 8.
  • a pulp suspension 1 is formed in the pulper 10, which passes here via a feed tank 2 in the press 4, in which the consistency is set to a value, for example, is up to 30%.
  • the squeezed filtrate 14 flows into the press water tank 8.
  • the dewatered pulp is then passed with a consistency of between 6% and 30% in a reactor 6 and mixed there with calcium hydroxide, here in the form of lime milk (MOL).
  • a rotating coil 15 transports the substance through the reactor 6.
  • gaseous carbon dioxide CO 2 is added. It is provided here in a CO 2 supply device 16, whereby it is also possible to heat it in a CO 2 heater 17.
  • a suitable reactor 6 is, for example, a closed screw conveyor, which is preferably operated so that it is filled to a maximum of 80% - VoI, preferably 50% -vol, with a moist solid, wherein the water volume of the pulp is included. The remaining volume in the reactor 6 is occupied by gas or steam or spray liquid. Due to the movements of the contents, the reactants can easily come into contact. It may be advantageous to add some of the required calcium hydroxide to the fibers before the reactor 6, for which purpose lime milk MOL is added to the feed tank 2. Additionally or alternatively, the milk of lime MOL can also be added to the pulper 10.
  • the loading in the reactor 6 proceeds more efficiently.
  • Both the carbon dioxide and the supplied lime milk MOL can impinge on already formed calcium carbonate, so that a further crystallization occurs.
  • the process has the particular advantage that relatively much time is available for crystallization. It may initially form nuclei, which are then built up to larger crystals.
  • a reaction to free PCC can additionally take place between milk of lime droplets and carbon dioxide. The reactions are e.g. controlled by temperature, residence time, pH and concentration of the reactants.
  • a seal at the inlet 18 and outlet 23 is usually required, e.g. in the form of rotary valves 24.
  • a plug formation with the help of a screw plug may be omitted if the subsequent reactor 5 is operated at the same pressure.
  • the loaded pulp then passes into another reactor 5, which has already been described in connection with FIG.
  • this reactor 5 which works with much lower consistency, for example 0.1 to 6%, differently shaped calcium carbonate crystals can be formed.
  • the filtrate 14 originating from the press 4 can be added here for dilution by means of filtrate pump 12.
  • 3 shows a variant of the method in which two reactors operated in different consistency ranges are connected in parallel, namely a reactor 5 with 0.1 to 6% and a reactor 7 with 6 to 30%.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Procédé de formation de matière fibreuse, notamment de carbonate de calcium dans une suspension de matière fibreuse. Dans un mode de réalisation spécial, de l'hydroxyde de calcium est lié à une matière fibreuse mouillée par une solution aqueuse et ajouté à du dioxyde de carbone gazeux, ce qui permet la formation d'une matière fibreuse, notamment de carbonate de calcium, par réaction chimique. Dans au moins un réacteur (5) utilisé pour cette réaction, la consistance de la suspension de matière fibres est réglée entre 0,1 et 6 %. Dans des modes de réalisation particulièrement avantageux de l'invention, on utilise plusieurs réacteurs qui fonctionnent dans différentes conditions.
PCT/EP2008/001389 2007-04-20 2008-02-22 Procédé de formation de matières fibreuses, notamment de carbonate de calcium dans une suspension de matière fibreuse Ceased WO2008128595A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710018726 DE102007018726A1 (de) 2007-04-20 2007-04-20 Verfahren zum Bilden von Füllstoffen, insbesondere Calciumcarbonat in einer Faserstoffsuspension
DE102007018726.4 2007-04-20

Publications (1)

Publication Number Publication Date
WO2008128595A1 true WO2008128595A1 (fr) 2008-10-30

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PCT/EP2008/001389 Ceased WO2008128595A1 (fr) 2007-04-20 2008-02-22 Procédé de formation de matières fibreuses, notamment de carbonate de calcium dans une suspension de matière fibreuse

Country Status (2)

Country Link
DE (1) DE102007018726A1 (fr)
WO (1) WO2008128595A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174155A1 (fr) * 2013-04-26 2014-10-30 Wetend Technologies Oy Procédé pour alimenter une composition de fabrication d'une bande fibreuse en charge, et papier ou carton

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001409A1 (fr) * 1989-07-24 1991-02-07 The Board Of Regents Of The University Of Washington Chargement de parois cellulaires de fibres de pate toujours humides
EP0457235A1 (fr) * 1990-05-14 1991-11-21 New Oji Paper Co., Ltd. Procédé pour modifier des fibres hydrophiles avec une substance minérale relativement insoluble dans l'eau
US5096539A (en) * 1989-07-24 1992-03-17 The Board Of Regents Of The University Of Washington Cell wall loading of never-dried pulp fibers
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
US5665205A (en) * 1995-01-19 1997-09-09 International Paper Company Method for improving brightness and cleanliness of secondary fibers for paper and paperboard manufacture
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120463B (fi) * 2003-07-15 2009-10-30 Upm Kymmene Corp Menetelmä paperin valmistamiseksi ja paperi
DE102006003647A1 (de) * 2005-07-14 2007-01-18 Voith Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit Füllstoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001409A1 (fr) * 1989-07-24 1991-02-07 The Board Of Regents Of The University Of Washington Chargement de parois cellulaires de fibres de pate toujours humides
US5096539A (en) * 1989-07-24 1992-03-17 The Board Of Regents Of The University Of Washington Cell wall loading of never-dried pulp fibers
EP0457235A1 (fr) * 1990-05-14 1991-11-21 New Oji Paper Co., Ltd. Procédé pour modifier des fibres hydrophiles avec une substance minérale relativement insoluble dans l'eau
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
US5665205A (en) * 1995-01-19 1997-09-09 International Paper Company Method for improving brightness and cleanliness of secondary fibers for paper and paperboard manufacture
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014174155A1 (fr) * 2013-04-26 2014-10-30 Wetend Technologies Oy Procédé pour alimenter une composition de fabrication d'une bande fibreuse en charge, et papier ou carton
US9708772B2 (en) 2013-04-26 2017-07-18 Wetend Technologies Oy Method of providing fiber web making furnish with filler, and paper or paper board

Also Published As

Publication number Publication date
DE102007018726A1 (de) 2008-10-23

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