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WO2008131820A1 - Procédé pour charger de carbonate de calcium, formé à partir de composés d'(hydrogéno)carbonate, des fibres d'une suspension de substances fibreuses - Google Patents

Procédé pour charger de carbonate de calcium, formé à partir de composés d'(hydrogéno)carbonate, des fibres d'une suspension de substances fibreuses Download PDF

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Publication number
WO2008131820A1
WO2008131820A1 PCT/EP2008/001384 EP2008001384W WO2008131820A1 WO 2008131820 A1 WO2008131820 A1 WO 2008131820A1 EP 2008001384 W EP2008001384 W EP 2008001384W WO 2008131820 A1 WO2008131820 A1 WO 2008131820A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp suspension
carbonate
ammonium
added
suspension
Prior art date
Application number
PCT/EP2008/001384
Other languages
German (de)
English (en)
Inventor
Harald Hess
Tillman Katzenmeier
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 WO2008131820A1 publication Critical patent/WO2008131820A1/fr

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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
    • 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
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates

Definitions

  • the present invention relates to a process for loading fibers contained in a pulp suspension with calcium carbonate.
  • fillers are added to the pulp suspensions used in papermaking in order to improve the properties, in particular the optical properties, of the paper produced from the pulp suspension.
  • a frequently used for this purpose filler is calcium carbonate, which is usually not added in the form of a solid to the pulp suspension in the known method, but is formed by adding appropriate reagents in the pulp suspension in situ.
  • a corresponding method is the so-called "Fiber Loading TM" method, in which one or more calcium-containing compounds are added to a moist, disintegrated fiber material such that at least part of the added calcium compounds associate with the water present in the fiber material, before the so-called treated fiber material is then subjected to carbon dioxide to form calcium carbonate in the pulp suspension, which precipitates and settles depending on the process on the fibers or in the fiber interiors.
  • Fiber Loading TM in which one or more calcium-containing compounds are added to a moist, disintegrated fiber material such that at least part of the added calcium compounds associate with the water present in the fiber material, before the so-called treated fiber material is then subjected to carbon dioxide to form calcium carbonate in the pulp suspension, which precipitates and settles depending on the process on the fibers or in the fiber interiors.
  • US Pat. No. 6,413,365 discloses a process for loading fibers in a fibrous suspension with calcium carbonate, in which a fibrous suspension is first mixed with calcium oxide and calcium hydroxide before this fibrous suspension is mixed with carbon dioxide. oxide gas is applied, so that optionally after setting a suitable pH precipitate calcium carbonate crystals in the pulp suspension.
  • oxide gas is applied, so that optionally after setting a suitable pH precipitate calcium carbonate crystals in the pulp suspension.
  • the proportion of the deposited in this process on the fibers of calcium carbonate needs improvement.
  • US 3,029,181 has proposed a method of increasing the opacity of cellulosic fibers, in which the fibers are saturated with a 5-20% calcium or magnesium chloride solution, then a portion of the saturated solution is removed, so the moisture content of the resulting fibers is between 30 and 70% before ammonium carbonate is added to the wet fibers to precipitate calcium carbonate in the corresponding suspension.
  • a disadvantage of this method is that the calcium carbonate precipitation already begins with the addition of the ammonium carbonate, so that neither the type nor the size of the calcium carbonate crystals or precipitates can be controlled. In addition, this process inevitably precipitates some of the calcium carbonate in the fiber interior, which is undesirable in certain applications.
  • this object is achieved by a method for loading fibers contained in a pulp suspension with calcium carbonate, comprising the steps:
  • alkali metal carbonates From the group consisting of ammonium carbonate, ammonium bicarbonate, alkali metal carbonates, alkali metal hydrogencarbonates, alkaline earth metal carbonates, alkaline earth metal hydrogencarbonates and any mixtures thereof are hereinafter, notwithstanding that ammonium neither an alkali metal is an alkaline earth metal, for the sake of simplicity (alkaline) called alkali metal (hydrogen) carbonate.
  • the fibrous suspension is first added to a (earth) alkali metal (hydrogen) carbonate before crystallization or precipitation of calcium carbonate is triggered in the resulting suspension by adjusting or increasing the pH by adding at least one calcium ion-containing base , This allows a good precipitation can be achieved.
  • the choice of the concentration of the added compound (s) and the adjustment of the pH in step c) can control the rate of precipitation of the calcium carbonate formed or the precipitate reaction rate, thereby reducing the shape and size of the crystal or precipitate particles can be controlled.
  • the pulp suspension in step a compound selected from the group consisting of ammonium carbonate, ammonium bicarbonate, alkali metal bicarbonates, alkali metal hydrogencarbonates, alkaline earth metal carbonates, alkaline earth metal bicarbonates and any mixtures thereof except calcium carbonate and calcium bicarbonate added or added to the pulp suspension in step b2) are two or more compounds which in the pulp suspension is one consisting of ammonium carbonate, ammonium hydrogencarbonate, alkali metal carbonates, alkali metal hydrogencarbonates, alkaline earth metal carbonates, alkaline earth metal hydrogencarbonates and any mixtures thereof Group selected compound except calcium carbonate and excluding calcium hydrogen carbonate form.
  • the process according to the invention can be carried out with all pulp suspensions known to the skilled person for this purpose, in particular with all pulp suspensions known from papermaking, in particular with pulp suspensions having a pulp density between 0.5 and 50% by weight, preferably between 1 and 35% by weight .-%, more preferably between 3 and 25 wt .-% and most preferably between 7 and 20 wt .-%, particularly good results.
  • the pH of the pulp suspension provided in step a) is preferably less than 9.5. Good results are obtained, in particular, if the pH of the pulp suspension provided in step a) is between 3 and less than 9.5 and particularly preferably between 5 and 7.
  • the compound selected from the group consisting of ammonium carbonate, ammonium bicarbonate, alkali metal carbonates, alkali metal hydrogencarbonates, alkaline earth metal carbonates, alkaline earth metal hydrogencarbonates and any mixtures thereof may be added to the pulp suspension in step bi) as a solid or in the form of a preferably aqueous solution.
  • the addition of the (earth) alkali metal (hydrogen) carbonate as a solid to the pulp suspension according to step b) has proven to be particularly advantageous if the consistency of the pulp suspension is comparatively low and preferably between 1 and 5 wt .-%, preferably between 1 and 4 wt .-% and particularly preferably between 1 and 3 wt .-%, is.
  • the addition of the (earth) alkali metal (hydrogen) carbo- nate takes place, for example to prevent premature precipitation of calcium carbonate due to the presence of traces of calcium in the pulp suspension, preferably such that the pH of the pulp suspension after the addition of the (earth) alkali metal (hydrogen) carbonate is less than 11, preferably less than 9.5 and more preferably less is 8.
  • the pH of the pulp suspension should be adjusted before the addition of the aforementioned reason, for example by adding appropriate pH buffer, that the pH the pulp suspension after the addition of the (earth) alkali metal (hydrogen) carbonate is less than 11, preferably less than 9.5 and more preferably less than 8.
  • the pulp suspension in step b 1 be selected from the group consisting of sodium carbonate, sodium bicarbonate, ammonium carbonate, ammonium bicarbonate and any mixtures thereof Add connection.
  • the addition of this compound can also take place in the form of a solid or as an aqueous solution, the compound preferably being added in the form of an aqueous solution.
  • the compound of the pulp suspension in step bi) based on the total amount of the pulp suspension, in an amount between 1 and 40 wt .-%, preferably between 2 and 30 wt .-% and particularly preferably between 3 and 25 wt .-% is added.
  • the pulp suspension is replaced by step b2) in step b2) i) ammonia and carbon dioxide, ii) ammonium hydroxide and
  • Carbon dioxide and / or iii) sodium hydroxide and carbon dioxide are added, so that after their addition in the pulp suspension in cases i) and ii) a mixture of ammonium carbonate and ammonium hydrogen carbonate or in case iii) forms a mixture of sodium carbonate and sodium bicarbonate.
  • the pulp suspension for initiating the precipitation of lime is added at least one calcium ion-containing base in order to provide calcium ions for the formation of calcium carbonate and to increase the pH of the pulp suspension to a value of at least 8.
  • the pulp suspension can be added to any calcium ion-containing base known to the person skilled in the art for the purpose of adjusting the pH value, good results being obtained, in particular, with calcium hydroxide. If calcium hydroxide is added, this addition can also be effected, for example, by adding calcium oxide to the pulp suspension, which then forms calcium hydroxide in the pulp suspension.
  • the calcium hydroxide of the pulp suspension in step c) is added in the form of an aqueous solution.
  • At least one further base may be added to the pulp suspension in step c).
  • the at least one additional base added in step c) is selected from the group consisting of metal hydroxides, sodium carbonate, ammonium hydroxide and any combinations thereof.
  • Particularly suitable metal hydroxides are alkali metal hydroxides and / or alkaline earth metal hydroxides for this purpose.
  • the at least one further base is selected from the group consisting of sodium hydroxide, potassium hydroxide, magnesium hydroxide, sodium carbonate, ammonium hydroxide, and any combination of two or more of the foregoing.
  • the pulp suspension in step c) is particularly preferably added as base only calcium hydroxide.
  • step c) it is proposed to adjust the pH of the pulp suspension in step c) to a value of at least 10.
  • a dehydration step may be carried out in order to return the saline solution which has not penetrated into the fibers.
  • a dewatering step may be performed after the precipitation of calcium carbonate by thickening the pulp suspension, for example by squeezing out water, to recycle the squeezed water in the process.
  • the squeezed-out water can be recycled for dilution at dissolution or before flotation, for adjusting the pH at dissolution or before flotation, and / or for adjusting the pH at precipitation in the process.
  • the manipulated variable used being the amount of base added in step c).
  • the calcium carbonate content in the pulp suspension can be regulated, the manipulated variable used being the amount of calcium compound added.
  • step bi ammonium carbonate and / or ammonium bicarbonate added is proved to be advantageous to carry out the process continuously and suck off the ammonia forming after the addition of the base in step c) from the fiber suspension and due to the reaction step bi).
  • step b2) If, instead of step bi), the process step b2) is carried out and the fiber suspension in step b2) ammonia and carbon dioxide and / or ii) ammonium hydroxide and carbon dioxide is added, it has proved equally advantageous to carry out the process continuously and after the Adding the base in step c) sucking ammonia from the fiber suspension and to the reaction step b2) due.
  • Another object of the present invention are calcium carbonate loaded fibers, which are obtainable by the aforementioned method.
  • the suspension was acidified with carbon dioxide to pH 10 and then thickened to a consistency of 30%, wherein the weight of the pulp suspension was determined together with the water contained, and wherein the pressed-off water with carbon dioxide to pH 8.0 was acidified.
  • the now sodium carbonate-containing water was returned to the process.
  • a paper could be obtained which was of high quality in terms of its optical and performance properties.
  • a high proportion of calcium carbonate was bound to the fibers internally and externally. Good levels of opacity, whiteness and volume were achieved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé pour charger de carbonate de calcium des fibres contenues dans une suspension de substances fibreuses, lequel procédé consiste a) à préparer une suspension de substances fibreuses contenant des fibres, b1) à ajouter à la suspension de substances fibreuses un composé sélectionné dans le groupe constitué par le carbonate d'ammonium, l'hydrogénocarbonate d'ammonium, les carbonates de métaux alcalins, les hydrogénocarbonates de métaux alcalins, les carbonates de métaux alcalinoterreux, les hydrogénocarbonates de métaux alcalinoterreux et des mélanges quelconques de ces éléments, ou b2) à ajouter deux composés ou plus à la suspension de substances fibreuses, lesquels composés forment dans la suspension de substances fibreuses un composé sélectionné dans le groupe constitué par le carbonate d'ammonium, l'hydrogénocarbonate d'ammonium, les carbonates de métaux alcalins, les hydrogénocarbonates de métaux alcalins, les carbonates de métaux alcalinoterreux, les hydrogénocarbonates de métaux alcalinoterreux et des mélanges quelconques de ces éléments, puis c) à régler le pH de la suspension de substances fibreuses à une valeur d'au moins 8,0 par ajout d'au moins une base contenant des ions calcium.
PCT/EP2008/001384 2007-04-26 2008-02-22 Procédé pour charger de carbonate de calcium, formé à partir de composés d'(hydrogéno)carbonate, des fibres d'une suspension de substances fibreuses WO2008131820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007019783A DE102007019783A1 (de) 2007-04-26 2007-04-26 Verfahren zum Beladen von Fasern einer Faserstoffsuspension mit Calciumcarbonat gebildet aus (Hydrogen)carbonatverbindungen
DE102007019783.9 2007-04-26

Publications (1)

Publication Number Publication Date
WO2008131820A1 true WO2008131820A1 (fr) 2008-11-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/001384 WO2008131820A1 (fr) 2007-04-26 2008-02-22 Procédé pour charger de carbonate de calcium, formé à partir de composés d'(hydrogéno)carbonate, des fibres d'une suspension de substances fibreuses

Country Status (2)

Country Link
DE (1) DE102007019783A1 (fr)
WO (1) WO2008131820A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2505438A (en) * 2012-08-29 2014-03-05 Ccm Res Ltd Pre-treated cellulosic material admixed with polymer
EP2781651A1 (fr) 2013-03-18 2014-09-24 Linde Aktiengesellschaft Procédé de chargement de fibre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0916485D0 (en) 2009-09-18 2009-10-28 Hammond Peter Improved materials

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373134A (en) * 1963-10-18 1968-03-12 Toa Gosei Kagaku Kogyo Kabushi Compositions of calcium carbonate, process for the production and uses of the same
US5262006A (en) * 1989-02-13 1993-11-16 Mo Och Domsjo Aktibolag Paper manufacturing process, and papers obtainable by means of that process
US5275699A (en) * 1992-10-07 1994-01-04 University Of Washington Compositions and methods for filling dried cellulosic fibers with an inorganic filler
EP1172478A1 (fr) * 2000-07-13 2002-01-16 Voith Paper Patent GmbH Procédé pour le chargement de fibres avec carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern
US6706148B1 (en) * 1999-08-13 2004-03-16 Georgia-Pacific France Method for fixing a mineral filler on cellulosic fibers and method for making a sheet of paper

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599091A (en) 1946-04-23 1952-06-03 Vanderbilt Co R T Forming pigment in cellulose fiber and paper containing the pigmented fiber
US2583548A (en) 1948-03-17 1952-01-29 Vanderbilt Co R T Production of pigmented cellulosic pulp
US3029181A (en) 1959-05-18 1962-04-10 Alfred M Thomsen Method of increasing the opacity of cellulose fibers
US6413365B1 (en) 2001-07-11 2002-07-02 Voith Paper Patent Gmbh Method of loading a fiber suspension with calcium carbonate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373134A (en) * 1963-10-18 1968-03-12 Toa Gosei Kagaku Kogyo Kabushi Compositions of calcium carbonate, process for the production and uses of the same
US5262006A (en) * 1989-02-13 1993-11-16 Mo Och Domsjo Aktibolag Paper manufacturing process, and papers obtainable by means of that process
US5275699A (en) * 1992-10-07 1994-01-04 University Of Washington Compositions and methods for filling dried cellulosic fibers with an inorganic filler
US6706148B1 (en) * 1999-08-13 2004-03-16 Georgia-Pacific France Method for fixing a mineral filler on cellulosic fibers and method for making a sheet of paper
EP1172478A1 (fr) * 2000-07-13 2002-01-16 Voith Paper Patent GmbH Procédé pour le chargement de fibres avec carbonate de calcium
DE10204254A1 (de) * 2002-02-02 2003-08-14 Voith Paper Patent Gmbh Verfahren zur Aufbereitung von in einer Faserstoffsuspension enthaltenen Fasern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2505438A (en) * 2012-08-29 2014-03-05 Ccm Res Ltd Pre-treated cellulosic material admixed with polymer
GB2505438B (en) * 2012-08-29 2017-12-13 Ccm Res Limited Pre-treated cellulosic material admixed with polymer
EP2781651A1 (fr) 2013-03-18 2014-09-24 Linde Aktiengesellschaft Procédé de chargement de fibre

Also Published As

Publication number Publication date
DE102007019783A1 (de) 2008-10-30

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