EP1397551A2 - Procede de fabrication de cellulose - Google Patents

Procede de fabrication de cellulose

Info

Publication number
EP1397551A2
EP1397551A2 EP02702355A EP02702355A EP1397551A2 EP 1397551 A2 EP1397551 A2 EP 1397551A2 EP 02702355 A EP02702355 A EP 02702355A EP 02702355 A EP02702355 A EP 02702355A EP 1397551 A2 EP1397551 A2 EP 1397551A2
Authority
EP
European Patent Office
Prior art keywords
pulp
production
loading
bleaching
loaded
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.)
Withdrawn
Application number
EP02702355A
Other languages
German (de)
English (en)
Inventor
Helmut Heinzmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1397551A2 publication Critical patent/EP1397551A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • 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

Definitions

  • the invention relates to a method for producing cellulose for further use for the production of a fibrous web, in particular paper or cardboard web.
  • Pulp is manufactured in pulp mills by various methods.
  • the raw materials are natural raw materials, such as (mainly) wood, straw, jute, etc.
  • Wood is, for example, broken down in a cooking process, and the pulp fibers are extracted and subjected to further process steps (eg bleaching, washing, etc.) to improve quality.
  • the pulp is dewatered, dried and transported, for example in bale form, to the paper mills.
  • the pulps are redissolved in fabric solutions and processed for the papermaking process, for example ground and mixed with fillers. This can be done by directly adding filler, for example calcium carbonate (Ca-CO 3 ), or by loading the surfaces of the cellulose fibers with a precipitated additive, for example filler such as calcium carbonate.
  • filler for example calcium carbonate (Ca-CO 3 )
  • Loading with an additive can be carried out, for example, by a chemical precipitation reaction, ie in particular by a so-called “Fiber Loading TM” process, as is described, inter alia, in US Pat. No. 5,223,090.
  • a chemical precipitation reaction ie in particular by a so-called "Fiber Loading TM" process, as is described, inter alia, in US Pat. No. 5,223,090.
  • a chemical precipitation reaction preferably takes place directly on the fiber surfaces.
  • the fibers can be loaded with calcium carbonate, for example.
  • the moist, disintegrated fiber material Calcium oxide and / or calcium hydroxide are added 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.
  • the calcium oxide and / or the calcium hydroxide medium is added to the fiber suspension, a chemical reaction with an exothermic property takes place, the calcium hydroxide preferably being added in liquid form (milk of lime). This means that the water which is possibly stored in or on the fibers of the fiber suspension is not absolutely necessary for the start and the course of the chemical reaction.
  • the aim of the invention is to provide a method of the type mentioned at the outset with which the efficiency of a "Fiber Loading TM" process used and the economy of the provision of raw materials, in particular for paper and cardboard production, are increased.
  • This object is achieved according to the invention by a process for the production of cellulose for further use for the production of a fibrous web, in particular paper or cardboard web, in which the cellulose obtained by a cellulose production process is first loaded with additive by a chemical precipitation reaction and then the one already loaded Cellulose is dried and made available for further use or put into shipping form.
  • the combination of cellulose production with the loading process according to the invention improves paper quality. Since there is no drying between the cellulose production process and the loading process, more calcium hydroxide or calcium oxide can get through the fiber walls and thus a higher filler content can be achieved on the inner cell wall surfaces after the precipitation process, whereby the desired effect by Load is increased.
  • Another advantage of the method according to the invention is that the pulp fibers can be loaded centrally in the pulp mill. This means that only one larger loading station is required for all customers of the pulp mill. In contrast, a decentralized loading requires a separate loading station for each customer, whereby the loading process as a whole is also less efficient due to the overall longer downtimes and set-up times.
  • pulp loaded with precipitated filler can be more easily dewatered and, accordingly, dried more easily.
  • the cellulose panels manufactured by the cell factory for shipping which usually have a multiple of the thickness of paper (> 1000 g / m 2 ), can be economically brought to a higher dry content than before. Since correspondingly less water has to be transported, transportation costs are saved. On the other hand, drying energy can be saved considerably with the same shipping dry contents.
  • the strength potential of the fibers and, accordingly, the strength of the paper subsequently produced in the paper mill can be increased considerably by the combination of the pulp production and the loading, or less fiber material has to be used for a certain paper strength.
  • this is due to the fact that by combining the loading process with the pulp production, significantly more calcium carbonate is introduced into the inside of the pulp fibers, because the fiber walls are still soaked and so facilitate the passage of lime milk, for example.
  • this is also due to the fact that for a required filler content in the paper, part of the filler is bound within the lumen of the fibers, and thus the fiber binding points on the outer surface of the fibers are not blocked thereby.
  • the pulp is subjected to bleaching after or in combination with the fiber loading process.
  • At least one bleaching agent can be added to the pulp! such as peroxides, chlorine, oxygen, ozone and / or the like can be added.
  • the bleaching can in particular also be carried out in several stages using different bleaching agents. It is of particular advantage that the bleaching process after the "Fiber Loading TM" process can be combined with the bleaching process usually present in the pulp mill, as a result of which the effort for chemical processing and the effort for disposal and reprocessing of the waste products are reduced accordingly.
  • the pulp has a dry content after the drying process which is greater than 80%, in particular greater than 85%, suitably greater than 90% and preferably greater than 95%.
  • the pulp can be ground after loading, which increases its degree of grinding and strength potential.
  • the fibrous material can be loaded in particular with precipitated calcium carbonate.
  • the pulping process can include, for example, cooking natural fibers.
  • the fibrous material is expediently provided in the form of a bale, a roll or the like for further use or for dispatch.
  • the method according to the invention can also be used for semi-pulp and wood pulp (stone grinding, GMP, brown grinding, refiner wood pulp RMP, thermomechanical wood pulp TMP, CTMP).
  • the process according to the invention can advantageously be used for pulps which are produced by the sulfate process and / or by the sulfite process.
  • the sulfate pulp process calcium hydroxide is used for chemical recovery.
  • the combination of the relevant method steps according to the invention results in a clear synergy effect.
  • a pulp produced by the method according to the invention is used in the production of a fibrous web, in particular paper or cardboard web.
  • calcium carbonate (CaCO 3 ) When loading the fibers with, for example, filler, calcium carbonate (CaCO 3 ), for example, can be embedded on the wetted fiber surfaces by adding calcium oxide (CaO) and / or calcium hydroxide (Ca (OH) 2 ) to the moist fiber material, at least some of which coexists can associate the water with the amount of fiber. The fiber material treated in this way can then be exposed to carbon dioxide (CO 2 ).
  • the term "wetted fiber surfaces" can encompass all wetted surfaces of the individual fibers. This also includes in particular the case in which the fibers are loaded with calcium carbonate or any other precipitation product which is well known to the person skilled in the art, both on its outer surface and in its interior (lumen).
  • the fibers can e.g. are loaded with the filler calcium carbonate, the attachment to the wetted fiber surfaces being carried out by a so-called “Fiber Loading TM” process, as is described as such in US Pat. No. 5,223,090.
  • this "Fiber Loading TM” process e.g. the carbon dioxide with the calcium hydroxide to water and calcium carbonate.
  • a first method step 10 then includes chemical pulp processing and production.
  • the pulp obtained by this pulping process is then processed in a subsequent process step 12 by a chemical precipitation reaction with additive, e.g. Filler, loaded.
  • additive e.g. Filler
  • calcium oxide and / or calcium hydroxide can be added to the fiber material in such a way that at least part of it coincides with that in the fiber material, ie between the fibers, in the hollow fibers and in whose walls can associate existing water, resulting in the following chemical reaction:
  • the carbon dioxide (CO 2 ) is then applied to the fiber material in such a way that calcium carbonate (CaCO 3 ) is largely deposited on the wetted fiber surfaces.
  • Fiber Loading TM Ca (OH) 2 + CO 2 ⁇ CaCO 3 + H 2 O
  • pulp is then dewatered and dried (cf. process step 14).
  • the loaded, dewatered and dried pulp is then made available for further use in a subsequent process step 16 or brought into shipping form (eg bales, rolls, ).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

L'invention concerne un procédé de fabrication de cellulose destinée à être utilisée dans la fabrication de feuille continue, notamment de papier ou de carton. Selon l'invention, la cellulose obtenue par un procédé de fabrication est tout d'abord chargée d'un additif lors d'une réaction de précipitation chimique, puis la cellulose ainsi chargée est séchée et préparée pour une utilisation ultérieure ou conditionnée pour être expédiée.
EP02702355A 2001-04-26 2002-02-15 Procede de fabrication de cellulose Withdrawn EP1397551A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10120526 2001-04-26
DE10120526A DE10120526A1 (de) 2001-04-26 2001-04-26 Verfahren zur Herstellung von Zellstoff
PCT/EP2002/001611 WO2002088187A2 (fr) 2001-04-26 2002-02-15 Procede de fabrication de cellulose

Publications (1)

Publication Number Publication Date
EP1397551A2 true EP1397551A2 (fr) 2004-03-17

Family

ID=7682850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02702355A Withdrawn EP1397551A2 (fr) 2001-04-26 2002-02-15 Procede de fabrication de cellulose

Country Status (6)

Country Link
US (1) US20040084161A1 (fr)
EP (1) EP1397551A2 (fr)
BR (1) BR0205435A (fr)
CA (1) CA2445340A1 (fr)
DE (1) DE10120526A1 (fr)
WO (1) WO2002088187A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060405A1 (de) * 2004-12-14 2006-07-06 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Suspension enthaltenen Fasern oder enthaltenem Zellstoff mit einem Füllstoff
DE102007020324A1 (de) * 2007-04-30 2008-11-06 Voith Patent Gmbh Verfahren zur Bildung von Calciumcarbonat in einer Faserstoffsuspension
DE102007028539A1 (de) * 2007-06-21 2008-12-24 Voith Patent Gmbh Verfahren zum Bilden von Calciumcarbonat in einer Faserstoffsuspension
FI125278B (fi) * 2010-08-20 2015-08-14 Upm Kymmene Corp Menetelmä kalsiumkarbonaatin saostamiseksi sekä menetelmän käyttö

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599093A (en) * 1948-03-17 1952-06-03 Vanderbilt Co R T Pigmented cellulose fiber
US4510020A (en) * 1980-06-12 1985-04-09 Pulp And Paper Research Institute Of Canada Lumen-loaded paper pulp, its production and use
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
MX9704911A (es) * 1994-12-28 1997-10-31 Minerals Tech Inc Blanqueo de papel rellenado.
US5679220A (en) * 1995-01-19 1997-10-21 International Paper Company Process for enhanced deposition and retention of particulate filler on papermaking fibers
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
FI100670B (fi) * 1996-02-20 1998-01-30 Metsae Serla Oy Menetelmä täyteaineen lisäämiseksi selluloosakuituperäiseen massaan
KR20000070779A (ko) * 1997-02-11 2000-11-25 마아빈 제이 파우웰 제지공정에서 셀룰로즈 섬유로 무기충전제를 관강(管腔)부하하는 방법
FI104502B (fi) * 1997-09-16 2000-02-15 Metsae Serla Oyj Menetelmä paperirainan valmistamiseksi
EP2058434A1 (fr) * 1999-08-13 2009-05-13 Georgia-Pacific France Procédé de fabrication d'une feuille de papier comprenant une étape de fixation d'une charge minérale sur des fibres cellulosiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02088187A3 *

Also Published As

Publication number Publication date
CA2445340A1 (fr) 2002-11-07
WO2002088187A3 (fr) 2003-03-27
DE10120526A1 (de) 2002-10-31
US20040084161A1 (en) 2004-05-06
WO2002088187A2 (fr) 2002-11-07
BR0205435A (pt) 2003-05-06

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