WO2008131821A1 - PROCÉDÉ POUR CHARGER DE CaCO3, FORMÉ À PARTIR DE CaCl2 ET DE Ca(HCO3)2, (NH4)2CO3 ET/OU NH4HCO3, DES FIBRES D'UNE SUSPENSION DE SUBSTANCES FIBREUSES - Google Patents

PROCÉDÉ POUR CHARGER DE CaCO3, FORMÉ À PARTIR DE CaCl2 ET DE Ca(HCO3)2, (NH4)2CO3 ET/OU NH4HCO3, DES FIBRES D'UNE SUSPENSION DE SUBSTANCES FIBREUSES Download PDF

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Publication number
WO2008131821A1
WO2008131821A1 PCT/EP2008/001390 EP2008001390W WO2008131821A1 WO 2008131821 A1 WO2008131821 A1 WO 2008131821A1 EP 2008001390 W EP2008001390 W EP 2008001390W WO 2008131821 A1 WO2008131821 A1 WO 2008131821A1
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WO
WIPO (PCT)
Prior art keywords
pulp suspension
added
suspension
calcium
hydroxide
Prior art date
Application number
PCT/EP2008/001390
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 WO2008131821A1 publication Critical patent/WO2008131821A1/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
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/73—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof
    • D06M11/76—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with carbon or compounds thereof with carbon oxides or carbonates
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic

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. 3,029,181 has proposed a process for increasing the opacity of cellulose fibers, in which the fibers are saturated with a 5-20% calcium or magnesium chloride solution, then a part of the saturated solution is removed so that 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.
  • this method does not permit control of the ratio of calcium carbonate settling on the fiber surface to the calcium carbonate settling in the fiber interior.
  • the object of the present invention is to provide a process for loading fibers contained in a solid suspension with calcium carbonate, which is quick and easy to carry out, and which is characterized in particular by the fact that with this the rate of reaction of calcium carbonate crystallization or precipitation and Thus, the particle size and the crystal structure of the precipitated calcium carbonate and the ratio of the precipitated on the fiber surface calcium carbonate can be adjusted to the precipitated calcium carbonate in the fiber lumen to desired levels.
  • this object is achieved by a method for loading fibers contained in a pulp suspension with calcium carbonate, comprising the steps:
  • the pulp suspension is added, in any order, i) a calcium salt, preferably calcium chloride, and ii) at least one compound selected from the group consisting of calcium bicarbonate, ammonium carbonate, ammonium bicarbonate and any combinations thereof, to obtain the same by adjusting or increasing the pH by adding at least one base, the crystallization or precipitation of calcium carbonate to trigger bonat.
  • a calcium salt preferably calcium chloride
  • the pulp suspension in process step b) can be added to any calcium salt known to the person skilled in the art.
  • the calcium salt is selected from the group consisting of calcium chloride, calcium sulfate, calcium phosphate, calcium nitrate, and any combinations thereof.
  • the pulp suspension in process step b) calcium chloride (CaCb) is added as the calcium salt.
  • process step d) is carried out after process step c), and process step d) is particularly preferably after the process steps a), b) and c) performed. It is thereby achieved that the precipitation of the lime does not start until the at least one compound selected from the group consisting of Ca (HCO3) 2, (NH.sub.2 CO.sub.4, NH.sub.4HCO.sub.3 and any combinations thereof has been completely added to the pulp suspension and the size of the calcium carbonate crystals or precipitates are controlled particularly reliably.
  • Ca (HCO3) 2 NH.sub.2 CO.sub.4, NH.sub.4HCO.sub.3 and any combinations thereof has been completely added to the pulp suspension and the size of the calcium carbonate crystals or precipitates are controlled particularly reliably.
  • the process according to the invention can be carried out with all pulp suspensions known to the person skilled in the art for this purpose, in particular with all pulp suspensions known from papermaking, particularly good results being obtained with pulp suspensions having a pulp density between 1 and 35% by weight.
  • 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. Since the precipitation of the calcium carbonate is triggered only by the addition of the at least one base in step d), the inventive method is the order of addition of calcium chloride in step b) and the addition of the at least one from Ca (HCO3) 2, (NH4) 2CO3, NH4HCO3 and any combination thereof selected group selected compound according to step c) independently.
  • step b) addition of calcium chloride to the pulp suspension according to step b) before, simultaneously or after the addition of at least one compound selected from the group consisting of Ca (HCO3) 2, (NH ⁇ COs, NH4HCO3 and any combinations thereof) to the pulp suspension according to step c ) respectively.
  • the calcium chloride can be added in step b) as a solid or in the form of a preferably aqueous solution.
  • the addition of calcium chloride 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 calcium chloride as an aqueous solution to the pulp suspension has proved to be particularly advantageous if the consistency of the pulp suspension in the addition of calcium chloride between 0.5 and 50 wt .-% and preferably between 1 and 35 wt .-% ,
  • the addition of calcium chloride to prevent premature precipitation of calcium carbonate, for example due to the introduction of carbon dioxide from the atmosphere into the pulp suspension is preferably such that the pH of the pulp suspension after the Addition of calcium chloride is less than 9.5.
  • the addition of an aqueous calcium chloride solution this is achieved, for example, by the aqueous calcium chloride solution having a pH between 3 and less than 9.5 and preferably a pH between 5 and 7, wherein the adjustment of the pH of the aqueous Calcium chloride solution can be carried out in any manner known in the art, for example by adding known pH buffers.
  • the pH of the pulp suspension should be adjusted prior to the addition of the calcium chloride for the same reason, for example by adding appropriate pH buffers such that the pH of the pulp suspension after the pulp suspension Addition of calcium chloride is less than 9.5.
  • the calcium chloride in step b), based on the total amount of pulp suspension in an amount between 0.5 and 30 wt .-%, preferably between 1.5 and 22 wt .-% and particularly preferably between Add 2.5 and 15 wt .-% of the active substance.
  • step c) of the process according to the invention can be carried out in any manner known to the person skilled in the art for this purpose respectively.
  • the ammonium carbonate and / or ammonium bicarbonate can be added as a solid or as an aqueous solution to the pulp suspension. Since calcium hydrogencarbonate is not available as a solid, the addition of the calcium hydrogen carbonate is preferably carried out in the form of an aqueous solution.
  • the aqueous solution of the at least one compound selected from the group consisting of Ca (HCO3) 2, (NH4) 2CO3, NH4HCO3 and any combinations thereof preferably added in step c) has a pH between 3 and less as 11 and more preferably has a pH between 4 and 10.
  • the preparation of the aqueous solution of the at least one selected from the group consisting of Ca (HCO3) 2, (NH 4 ) 2C ⁇ 3, NH4HCO3 and any combinations thereof and the adjustment of the pH in all the skilled person for this purpose known ways for example, by adding known pH buffer done.
  • the pulp suspension containing the calcium ions is added with at least one base to initiate the precipitation of lime in order to increase the pH of the pulp suspension to a value of at least 8.
  • the pulp suspension can be added to any known to the expert for the purpose of pH adjustment base.
  • the at least one base added in step d) is a metal hydroxide, alkali metal hydroxides and / or alkaline earth metal hydroxides in particular having proven particularly suitable for this purpose.
  • the at least one base is selected from the group consisting of sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, ammonium hydroxide and any combination of two or more of the foregoing.
  • the at least one base added in step d) is sodium hydroxide and / or calcium hydroxide. If calcium hydroxide is added as the base, 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 at least one base may also be added to the pulp suspension in the form of a solid or in the form of a solution, for example in the form of an aqueous solution. Since the base must first dissolve in the pulp suspension when added as a solid, the at least one base of the pulp suspension in step d) is preferably added in the form of an aqueous solution to thereby achieve a rapid initiation of the precipitation of calcium carbonate after the addition. This ensures that, with good thorough mixing of the pulp suspension, the desired pH value in the pulp suspension is reached immediately after the addition of the at least one base.
  • step d) it is proposed to adjust the pH of the pulp suspension in step d) to a value of at least 9.5.
  • the fiber suspension is thickened after the precipitation of calcium carbonate, for example by squeezing out water, wherein the squeezed out water is preferably recycled 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 d).
  • the calcium carbonate content in the pulp suspension can be regulated, the manipulated variable used being the amount of calcium compounds added in steps b) and c).
  • Another object of the present invention are loaded with calcium carbonate fibers obtainable by the aforementioned method.
  • 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.
  • Example 2 The procedure was as described in Example 1 except that the fibrous suspension in step c) instead of an aqueous calcium bicarbonate solution, an aqueous ammonium carbonate solution, based on the pulp suspension, was added in an amount of 5.5 wt .-%. As in Example 1, water then became from the suspension pressed and recovered calcium chloride. The reaction NH3 + H2O + CO2 produced (NH4) 2CO3, which was also recycled.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (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, b) à ajouter un sel de calcium à la suspension de substances fibreuses, c) à ajouter à la suspension de substances fibreuses au moins un composé sélectionné dans le groupe constitué par Ca(HCO<SUB>3</SUB>)<SUB>2</SUB>, (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>, NH<SUB>4</SUB>HCO<SUB>3</SUB> et des combinaisons quelconques de ces derniers puis d) à régler le pH de la suspension de substances fibreuses à une valeur d'au moins 8 par ajout d'au moins une base.
PCT/EP2008/001390 2007-04-26 2008-02-22 PROCÉDÉ POUR CHARGER DE CaCO3, FORMÉ À PARTIR DE CaCl2 ET DE Ca(HCO3)2, (NH4)2CO3 ET/OU NH4HCO3, DES FIBRES D'UNE SUSPENSION DE SUBSTANCES FIBREUSES WO2008131821A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710019794 DE102007019794A1 (de) 2007-04-26 2007-04-26 Verfahren zum Beladen von Fasern einer Faserstoffsuspension mit CaCO3 gebildet aus CaCI2 und Ca(HCO3)2, (NH4)2CO3 und/oder NH4HCO3
DE102007019794.4 2007-04-26

Publications (1)

Publication Number Publication Date
WO2008131821A1 true WO2008131821A1 (fr) 2008-11-06

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Country Status (2)

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DE (1) DE102007019794A1 (fr)
WO (1) WO2008131821A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20105835A (fi) * 2010-08-04 2012-02-05 Nordkalk Oy Ab Menetelmä paperin tai kartongin valmistamiseksi
CN106758195A (zh) * 2016-12-15 2017-05-31 武汉纺织大学 一种改善经纱上浆效果的方法
WO2019229756A1 (fr) 2018-05-31 2019-12-05 Argaman Technologies Ltd. Procédé et système d'application de composés chimiques à des fibres naturelles et fibres traitées obtenues par lesdits procédé et système

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2365130A1 (fr) * 2010-02-18 2011-09-14 Bene_fit Systems GmbH & Co. KG Composite de fibres imprégné, sa fabrication et son utilisation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994008086A1 (fr) * 1992-10-07 1994-04-14 Board Of Regents Of The University Of Washington Compositions et procedes de remplissage de fibres cellulosiques sechees avec une charge de remplissage inorganique
WO1999042657A1 (fr) * 1998-02-20 1999-08-26 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de synthese de carbonate de calcium, produit obtenu

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994008086A1 (fr) * 1992-10-07 1994-04-14 Board Of Regents Of The University Of Washington Compositions et procedes de remplissage de fibres cellulosiques sechees avec une charge de remplissage inorganique
WO1999042657A1 (fr) * 1998-02-20 1999-08-26 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de synthese de carbonate de calcium, produit obtenu

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20105835A (fi) * 2010-08-04 2012-02-05 Nordkalk Oy Ab Menetelmä paperin tai kartongin valmistamiseksi
CN106758195A (zh) * 2016-12-15 2017-05-31 武汉纺织大学 一种改善经纱上浆效果的方法
WO2019229756A1 (fr) 2018-05-31 2019-12-05 Argaman Technologies Ltd. Procédé et système d'application de composés chimiques à des fibres naturelles et fibres traitées obtenues par lesdits procédé et système

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